BSC3i.pdf

Engineering for BSC3i

dn01154794Issue 4-1 en

# Nokia CorporationNokia Proprietary and Confidential

1 (98)

2003353Nokia BSC/TCSM S11.5 ProductDocumentation

The information in this documentation is subject to change without notice and describes only theproduct defined in the introduction of this documentation. This documentation is intended for theuse of Nokia's customers only for the purposes of the agreement under which the documentationis submitted, and no part of it may be reproduced or transmitted in any form or means without theprior written permission of Nokia. The documentation has been prepared to be used byprofessional and properly trained personnel, and the customer assumes full responsibility whenusing it. Nokia welcomes customer comments as part of the process of continuous developmentand improvement of the documentation.

The information or statements given in this documentation concerning the suitability, capacity, orperformance of the mentioned hardware or software products cannot be considered binding butshall be defined in the agreement made between Nokia and the customer. However, Nokia hasmade all reasonable efforts to ensure that the instructions contained in the documentation areadequate and free of material errors and omissions. Nokia will, if necessary, explain issueswhich may not be covered by the documentation.

Nokia's liability for any errors in the documentation is limited to the documentary correction oferrors. NOKIA WILL NOT BE RESPONSIBLE IN ANY EVENT FOR ERRORS IN THISDOCUMENTATION OR FOR ANY DAMAGES, INCIDENTAL OR CONSEQUENTIAL(INCLUDING MONETARY LOSSES), that might arise from the use of this documentation or theinformation in it.

This documentation and the product it describes are considered protected by copyrightaccording to the applicable laws.

NOKIA logo is a registered trademark of Nokia Corporation.

Other product names mentioned in this documentation may be trademarks of their respectivecompanies, and they are mentioned for identification purposes only.

Copyright © Nokia Corporation 2005. All rights reserved.

2 (98) # Nokia CorporationNokia Proprietary and Confidential



Contents

Contents 3

List of tables 5

List of figures 6

Summary of changes 9

1 Overview of Engineering for BSC3i 11

2 Introducing the BSC3i 152.1 Overview of the BSC3i in GSM/EDGE mobile network 152.2 DX 200 system architecture and BSC3i block diagram 172.3 DX 200 redundancy principles 18

3 Mechanical construction of the BSC3i 213.1 BSC3i cabinets 213.2 Cartridges 253.3 Plug-in units 273.4 Cabling 29

4 BSC3i cabinet configuration and capacity 314.1 BSC3i cabinet descriptions 314.2 Capacity steps of the BSCC 36

5 Functional unit descriptions for BSC3i 395.1 Base Station Controller Signalling Unit (BCSU) in the BSC3i 405.2 Bit Group Switch (GSW1KB/GSWB) in the BSC3i 465.2.1 GSW1KB, 1024 PCM Bit Group Switch 465.2.2 GSWB, 256 PCM Bit Group Switch 485.3 Clock and Synchronisation Unit (CLS) in the BSC3i 505.4 Exchange Terminal (ET) in the BSC3i 525.4.1 Exchange Terminal ET4 525.4.2 Exchange Terminal ET2 555.5 IP interfaces in the BSC3i 575.6 Marker and Cellular Management Unit (MCMU) in the BSC3i 635.7 Message Bus (MB) in the BSC3i 655.8 Operation and Maintenance Unit (OMU) in BSC3i 665.9 Power Distribution Fuse Unit (PDFU) in the BSC3i 75

6 Overview of the BSC3i installation site 836.1 Equipment room layout 836.2 Cable structures and estimated power consumption 86

7 Alarm system for BSC3i 877.1 Collection of alarms 887.2 Alarms from the TCSM2 897.3 BTS alarm handling in the BSC 89



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Contents

7.4 BSS transmission equipment handling 907.5 Nokia NetAct network management system 907.6 EXAU 91

8 Synchronisation for BSC3i 93

9 Management network topology for BSC3i 97




List of tables

Table 1. Nokia GSM/EDGE BSC product family 12

Table 2. Nokia GSM/EDGE PCU product family 13

Table 3. Plug-in units of the BCSU S11.5 with AS7-C 41

Table 4. Plug-in units of the BCSU S11.5 with AS7-B 42

Table 5. Plug-in units of the BCSU (S11) 43

Table 6. Plug-in units of the BCSU (S10.5) 45

Table 7. Plug-in units of the GSW1KB in SW10C-A cartridge 47

Table 8. Plug-in units of the GSWB in the SW1C-C cartridge 49

Table 9. Plug-in units of the CLS 51

Table 10. ET4 plug-in units 55

Table 11. The ET plug-in units 56

Table 12. Plug-in units of the MCMU-housing SWU units 59

Table 13. Plug-in units of the MCMU 64

Table 14. Plug-in units of the OMU, S11.5 69

Table 15. Plug-in units of the OMU, S11 72

Table 16. Plug-in units of the OMU in BCS3i, S10.5 74



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List of tables

List of figures

Figure 1. BSC3i in the GSM/EDGE (and 3G) mobile network 16

Figure 2. Block diagram of the BSC3i 18

Figure 3. Equipment cabinet IC209-A and its components 23

Figure 4. Side Cable Conduit (SCC) 25

Figure 5. cPCI cartridge and the cartridge shelf 26

Figure 6. Example of cPCI plug-in units CP710-A, PSC6-A, and MBIF-B 28

Figure 7. Example of non-cPCI plug-in units CL3TG, SW128B, and ET4 29

Figure 8. Equipping of the BSCC cabinet (with GSW1KB group switch) 33

Figure 9. Equipping of the BSCC cabinet (with GSWB group switch) 34

Figure 10. Configuration steps one, two and three (each step 110 TRXs) 37

Figure 11. Configuration steps four, five and six (each step 110 TRXs) 38

Figure 12. BCSU equipment in the CC3C-A cartridge (S11 release level) 43

Figure 13. BCSU equipment in the CC3C-A cartridge (S10.5) 45

Figure 14. GSW1KB equipment in the SW10C-A cartridge 47

Figure 15. GSWB equipment in the SW1C-C cartridge 49

Figure 16. Two Clock and Synchronisation Units (CLS) in the CLOC-B cartridge 51

Figure 17. ET4 equipment in the ET4C-B cartridge 54

Figure 18. ET equipment in the ET4C-B cartridge 56

Figure 19. The LAN connection principle in the BSC3i 58

Figure 20. LAN switches (ESB26 / ESB20-A) in the MCMU-housing CC4C-Acartridge 59

Figure 21. CPU LAN architecture 61

Figure 22. PCU LAN architecture 61

Figure 23. Overview of internal LAN management in BSC3i 62

Figure 24. MCMU equipment in the CC4C-A cartridge 64

Figure 25. Message bus (MB) 66

Figure 26. OMU equipment in the CM2C-A cartridge, AS7-C alternative (S11.5) 68

Figure 27. OMU equipment in the CM2C-A cartridge, AC25 alternative 69




Figure 28. OMU equipment in the CM2C-A cartridge, AS7-C alternative (S11) 71

Figure 29. OMU equipment in the CM2C-A cartridge, S10.5 74

Figure 30. The two PDFU-B units at the top of the BSCC cabinet 77

Figure 31. The four PDFU-A units at the top of the BSCC cabinet 78

Figure 32. Power distribution diagram of the BSCC cabinet with PDFU-Bs 80

Figure 33. Power distribution diagram of the BSCC cabinet with PDFU-As 81

Figure 34. Power supply to the BSCC cabinet with PDFU-B 82

Figure 35. Power supply to the BSCC cabinet with PDFU-A 82

Figure 36. Space requirements of the BSC3i network element 84

Figure 37. Left-to-right configuration, an example 85

Figure 38. Right-to-left configuration (raised floor) with Side Cable Conduit, anexample 85

Figure 39. Implementation model of the alarm system 87

Figure 40. Block diagram of the EXAU 92

Figure 41. Synchronisation of the BSC 94

Figure 42. Nokia NetAct system interfaces (BSS includes BSC, TCSM2, transmissionequipment and BTS) 97



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List of figures

Summary of changes

Summary of changes

Changes between document issues are cumulative. Therefore, the latest documentissue contains all changes made to previous issues.

Changes between issues 4�1 and 4�0

Information about SERO-B Serial interface added.


Information on optional hardware upgrades in S11.5 Release added:

. PCU2-D, Second Generation Packet Control Unit upgrade

. GSW1KB, 1024 PCM Bit Group Switch upgrade

. ET4 Exchange Terminal upgrade

. BCSU LAPD capacity upgrade

Information on new products in S11.5 Release added:

. ESB26, Ethernet Switch for DX 200 with 26 ports

. ET4E / ET4E-C / ET4A Exchange Terminals

. PCU2-D, Second Generation Packet Control Unit

. PDFU-B, Power Distribution and Fuse Unit, Variant B

. SW10C-A, Switching Cartridge for 1024 PCMs

. SW128B, Switching Plug-in Unit for 8 kbit/s channels

. WDW73, 73 GB Hard Disk

The title of Chapter 4, BSC3i cabinet and Side Cable Conduit changed intoBSC3i cabinet configuration and capacity. Information on Side Cable Conduitmoved to Chapter 3, Mechanical construction of the BSC3i. The title of Chapter5, Introduction to the BSC3i functional unit descriptions changed into Functionalunit descriptions for BSC3i. Editorial and structural changes.


Structural changes.



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Summary of changes


S11 update. Information about new plug-in units and integrated LAN switchesadded. Figure updates and minor editorial changes.


Minor editorial changes made. Figure 3, Mechanical construction of the BSC3i,was updated.

Issue 1

This the first issue of DN01154794.




1 Overview of Engineering for BSC3i

Engineering for BSC3i provides the basic information needed for the installationplanning of the Nokia GSM/EDGE Base Station Controller BSC3i.

The following items are discussed:

. Introducing the BSC3i

. Mechanical construction of the BSC3i

. BSC3i cabinet configuration and capacity

. Functional unit descriptions for BSC3i

- Base Station Controller Signalling Unit (BCSU)

- Bit Group Switch (GSW1KB/GSWB)

- Clock and Synchronisation Unit (CLS)

- Exchange Terminal (ET)

- IP interfaces in the BSC3i

- Marker and Cellular Management Unit (MCMU)

- Message Bus (MB)

- Operation and Maintenance Unit (OMU)

- Power Distribution Fuse Unit (PDFU)

. Overview of the BSC3i installation site

. Alarm system of BSC3i

. Synchronisation for BSC3i

. Management network topology for BSC3i

Note

The subjects covered do not, however, include the installation planninginstructions for the site power supply equipment or for the PCM and alarmdistribution frames.



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Overview of Engineering for BSC3i

The site requirements for the BSC3i are discussed in Installation SiteRequirements for BSC and TCSM2. It provides the following information:

. dimensioning of the power supply and power distribution

. environmental requirements

. requirements for ventilation and air conditioning

. cabling

Use of BSC and PCU related terms

BSC, Base Station Controller, is a general term for all Nokia GSM/EDGE BSCversions. The BSC products are listed in the table below.

Table 1. Nokia GSM/EDGE BSC product family

Generalname

Product name Explanation

BSCE BSCE First generation Nokia DX 200 BSC

BSCi BSCi High Capacity (upgraded and improved) version of the firstgeneration Nokia DX 200 BSC

BSC2 BSC2A American National Standards Institute (ANSI) version of the secondgeneration Nokia DX 200 BSC2

BSC2 BSC2E European Telecommunications Standards Institute (ETSI) version ofthe second generation Nokia DX 200 BSC2

BSC2i BSC2i, ANSIversion

American National Standards Institute (ANSI) High Capacity versionof the Nokia DX 200 BSC2

BSC2i BSC2i, ETSIversion

European Telecommunications Standards Institute (ETSI) HighCapacity version of the Nokia DX 200 BSC2

BSC3i BSC3i, ANSIversion

American National Standards Institute (ANSI) High Capacity versionof the Nokia BSC3i

BSC3i BSC3i, ETSIversion

European Telecommunications Standards Institute (ETSI) HighCapacity version of the Nokia BSC3i

PCU, Packet Control Unit, is a general term for all Nokia GSM/EDGE PCUversions. The PCU variants are listed in the table below.




Table 2. Nokia GSM/EDGE PCU product family

General nameProductvariant name Explanation

Nokia First GenerationPacket Control Unit -PCU1

PCU

PCU-S

PCU-T

First generation PCU for BSCE, BSC2E/A, BSCi andBSC2i

PCU-B First generation PCU for BSC3i, includes two logical PCUs

Nokia SecondGeneration PacketControl Unit - PCU2

PCU2-U Second generation PCU for BSCE, BSC2E/A, BSCi andBSC2i

PCU2-D Second generation PCU for BSC3i, includes two logicalPCUs

Use of product names

Note that the product names in the documentation may be written with or withoutthe variant designation. For example, plain 'MBIF' may be used instead of 'MBIF-B'.



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Overview of Engineering for BSC3i

2 Introducing the BSC3i

The following sections describe the basic functionality of the Nokia GSM/EDGEBSC3i. The emphasis is on the hardware implementation of the system.

For a general introduction, see Overview of Engineering for BSC3i .

2.1 Overview of the BSC3i in GSM/EDGE mobilenetwork

The Nokia GSM /EDGE Base Station Controller (BSC3i ) is a modern faulttolerant system for GSM 800/GSM 900/GSM 1800/GSM 1900 networks. NokiaBSC3i is based on modular software and hardware architecture. The distributedarchitecture of Nokia BSC3i is implemented with a high-capacity and redundantmultiprocessor system - the DX 200 Computing Platform. The system enables thedistribution of processing capacity to several computer units with dedicated tasks.

The DX 200 Computing Platform Product Family covers a wide application areain GSM/EDGE mobile networks and fixed telephone networks. The DX 200Computing Platform product family contains products for digital mobileapplications, such as Base Station Controller (BSC ), Transcoder Submultiplexer(TCSM2 ), Mobile Switching Centre (MSC ), Home Location Register (HLR )and 2G Serving GPRS Support Node (SGSN ), and also contains fixed networkapplications.

The main function of the BSC3i is to control and manage the Base StationSubsystem (BSS ) and the radio channels. Based on Nokia's long experience incellular networks, BSC3i is designed for efficient use of radio resources and iseasy to operate and maintain. The Nokia BSC is a stable, mature and highlyreliable product. One major feature of BSC3i is its field-proven multivendorfunctionality.

Together with the functionally distributed modular architecture of the DX 200Computing Platform and the latest commercially available industry standardhardware components, the BSC3i is easily expandable and cost-efficient and hashigh capacity.



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Introducing the BSC3i

Figure BSC3i in the GSM/EDGE (and 3G) mobile network shows the position ofthe BSC3i in the GSM/EDGE and 3G mobile network.

Figure 1. BSC3i in the GSM/EDGE (and 3G) mobile network

Modular structure of the BSC3i

The BSC3i is designed with a modular structure enabling a distributed processingarchitecture. This quality, combined with the wide range of both standard andoptional features available, makes it readily adaptable to the needs of eachindividual operator, as it allows for capacity dimensioning according to individualneed. External costs resulting from surplus capacity are avoided, and the operatorcan choose a selection of features and services tailored to meet the demands of hiscustomers. When additional capacity or new facilities are needed, the networkelement can easily be expanded by adding new hardware and/or softwaremodules to the existing configuration.

The modular structure also allows for a compact design, which makes thenetwork element easy to install and helps to maintain efficient powerconsumption. Furthermore, it enables the use of sophisticated back-up techniquesensuring extremely high reliability and availability, with minimum downtimeeven during system expansions and service operations.

2G

BTS BSC

WCDMABTS

WCDMARNC

3G

Radio Access Network Core Network

LandlineNetwork

(PSTN/ISDN)

IP

MSC

GSM mobile

WCDMAmobile

IN

GSM/ WCDMAmobile

TranscoderSubmultiplexer

3G SGSN

HLR

2G SGSN 2G SGSN

Internet

Intranet

3G SGSN

dn03524007

SIMcard




2.2 DX 200 system architecture and BSC3i blockdiagram

Like the previous generations of DX 200 products, the Nokia GSM/EDGE BSC3inetwork element is designed with a modular software and hardware structure,which enables a distributed processing architecture. The distribution of processesis achieved by using a multi-processor system, in which the functions of thenetwork element are divided among several functional entities, called functionalunits .

Each functional unit has a separate task group to handle. For example, the SwitchMatrix has been organised as a separate unit, Group Switch (GSW1KB/GSWB)and it is controlled by another unit, called the Marker and Cellular ManagementUnit (MCMU). The key operation and maintenance functions are performed bythe Operation and Maintenance Unit (OMU), the external PCM lines areinterfaced by the Exchange Terminals (ETs), and so on.

Each functional unit has its own, separate hardware and software; most of themare equipped with a dedicated Pentium computer. These units are referred to ascomputer units and they are interconnected by the fast Message Bus, which againis organised as a functional unit of its own.

Figure Block diagram of the BSC3i presents the block diagram of the networkelement, which also shows the interfaces between the functional units and thoseconnecting the system to the environment. The hardware of the functional unitsand the tasks each unit handles are described in more detail in the sectionFunctional unit descriptions . Further information is available in the ProductDescription .



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Figure 2. Block diagram of the BSC3i

2.3 DX 200 redundancy principles

The reliability of the operations in the DX 200 network elements has beenensured by backing up all crucial parts of the system following variousredundancy principles, as described in the sections below.

Redundancy of the functional units

Different redundancy techniques are used for backing up different types offunctional units. Each unit participating in the switching functions or recording ofstatistical data is backed up according to the 2n redundancy principle, that is, byduplication according to the hot-standby or spare-device method. On the other

OMUBCSU

PCU

MCMU

DN03505883

SGSN

Gb over IP

SGSN

BTS

GSW1KB/GSWB

A ter A

X.25

MSC

MO device

Hard Disk drive

MB

PCU LANSwitch

CPU LANSwitch

IP

ET

ET

ET

CLS

TCSM2




hand, each signalling unit is backed up according to the n+1 or n+1/L principle.The former term means that there is one spare unit available to take over the tasksof a faulty unit; in the latter case, the workload is shared between all devices, andif one malfunctions the other units are able to carry the full load.

Redundant functional units should be consistent, owing to redundancy principles.The redundancy principle applied to each type of functional unit in the networkelement is given in the section Functional unit descriptions .

Redundancy of the power distribution, clock signal distribution and wiredalarm collection systems

Virtually the entire power distribution chain from the rectifiers and power feedcables to individual pieces of equipment in the cabinets has been duplicated tominimise the risk of downtime due to power failures in the DX 200 equipment orcabling. On one hand, the redundancy for the power supply from the rectifiers tothe cabinets has been achieved by duplicating the power inputs in the cabinets,along with the input cables. On the other hand, the cabinet is equipped with aduplicated power distribution and fuse unit, which allows for feeding the voltagesto units backing each other up through two separate distribution lines.

Likewise, the DX 200 network elements have a duplicated clock distribution andalarm collection system. The basic clock signal can be fed to each BSC3i networkelement from up to six inputs, four from other network elements (in the samenetwork or PSTN ) and two from external sources.

Ensuring reliability at unit level

At unit level, the following methods are used to ensure proper operation:

. error correcting RAM in critical parts

. parity bit or ECC in read-write memories

. parity checks in data transmission

. reporting on certain error events in data transactions on the system bus

. memory area protection (standard Intel processor capability)

. automatic testing of connections

. time-out supervision

. validity checks for input data on different program levels

. vital data (for example, call/event data) in protected memory



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. continuous supervision of the functioning of processes including restarts,when required

. continuous testing of operations (as background run) in all computer units.

Backing up units without nominal redundancy

Some of the functional units of the network element are described as having noredundancy at all. These include, for example, the ETs, that is, units whichinterface the network element to the environment. In fact, these units can also bebacked up by ensuring that there is a sufficient number of circuits available in thesame direction.

Another way to look at these units is to consider all units of a given type as a poolof resources, with several units available at a time to handle an assignment. Afailure in one unit will only reduce the size of the pool but not interrupt the traffic;consequently, redundancy for the pool as a whole can be ensured simply byreserving some extra capacity for it when dimensioning the capacity of thenetwork element.




3 Mechanical construction of the BSC3i

The basic mechanical structure of the BSC3i network element follows a standardhierarchy:

. cabinets

. cartridges

. plug-in units

. internal cables

The system is easy to install, maintain and operate. Particular attention has beenpaid to thermal and interference factors.

For a general introduction, see Overview of Engineering for BSC3i.

3.1 BSC3i cabinets

IC209-A cabinet

The equipment of the BSC3i network element is installed in a IC209-A cabinetvariant. The cabinet has a welded frame structure and it is designed followingprinciples based on IEC, EN, ETSI, UL and Telcordia recommendations, withadvanced features in terms of safety, protection against interference, stability, anddurability.

The IC209-A meets the EN 60950 and UL 60950 safety requirements, along withthe ETSI ETS 300019-1-3, Class 3.1E environmental requirements. Theearthquake resistance of the cabinets is in accordance with Telcordia GR63COREZone 4, and the EMC emission and immunity features comply with the EN300386 and (FCC) CFR 47, Part 15 standards, respectively.



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Mechanical construction of the BSC3i

The IC209-A is dimensioned according to ETS 300119-2 standard. The emphasisof the design is on easy transportability and suitability for installations inpremises with normal room height. Due to the simple mechanical structure withrelatively few components, the equipment cabinets are easy to assemble anddisassemble when necessary.

NEBS compliance

NEBS stands for Network Equipment Building System. It is a set of Telcordia(former Bellcore) Standards, whose purpose is to unify HW requirements andhelp Telephone companies to evaluate the suitability of products for use in theirnetworks. Compliance to NEBS is usually inquired by RBOC's (Regional BellOperator Company) in the USA. The DX 200 Network Element Hardware isNEBS Level 3 compliant, covering GR-63-CORE and GR-1089-CORE inCentral Office or equivalent premises, as applicable for Type 2 equipment, asspecified in GR-1089-CORE.

The IC209-A cabinet consists of the following parts (see Figure Equipmentcabinet IC209-A and its components:)

. welded cabinet frame (IC209-A)

. one Power Supply Connector Groups (PSCG3-B)

. Power Distribution Fuse Units: two PDFU-B units or four PDFU-A units

. four Fan Trays (FTRB) for forced cooling

. doors rear and front, left and right

. two side plates (SCP)

. support rails for cartridge shelves

. cartridge shelves

. cable supporting shelves

. wheels

. adjustable feet for permanent installation

. one RJ45 connector, LC-LC adapter, BNC connector, and D25 connectorpanel (CPRJ45)

. two cabling panels with grounding outlets (CPGO)

. one cover for cable conduit (COCC)




Figure 3. Equipment cabinet IC209-A and its components

Indoor cabinetIC209-A

Powerdistributionand fuse unit

Dual lineDC filter

Right hand sidedoor for indoorcabinet

Cable supportshelf

Horizontalgrounding bar

Left hand sidedoor for indoorcabinet

Rail for shelves

Cartridge

Verticalgrounding bar

Cartridge shelfwith place forfan units

Adjustment feetWheel

Cover for wheel box

Air guide

Cartridge shelf

CPGO CPRJ45CPGO

COCC

DN0280211

Door grounding cable

Door grounding cable



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Note

The cabling panels with grounding outlets (CPGO) are installed at site.

The IC209-A cabinet is equipped with wheels to facilitate moving at the site.Prior to permanent installation, the cabinet(s) of BCS3i are fitted with adjustablefeet and lined up side by side in cabinet rows. The dimensions of the IC209-Aequipment cabinet are given in the section BSC3i cabinet descriptions.

Side Cable Conduit (SCC)

In equipment rooms with a raised floor, the Side Cable Conduit (SCC) is usedwith each BSCC cabinet for cabling external cables. The SCC can be installed oneither side of the cabinet. See Figure Side Cable Conduit (SCC) below.

Note

The SCC is required only when the equipment room has a raised floor.




Figure 4. Side Cable Conduit (SCC)

The dimensions of the SCC are (H × W × D) 2000 mm × 600 mm × 75 mm (78.7in. × 23.6 in. × 2.95 in.).

3.2 Cartridges

The cartridges are installed in the cabinets at the factory. In the design of thecartridges, particular attention has been paid to durability even under demandingconditions, along with dimensioning for optimal use of cabinet space. Onecartridge usually contains the equipment of one functional unit. Two types ofcartridges are used in the BSC3i:

. cPCI cartridges

. non-cPCI cartridges.

DN01195368



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cPCI cartridges

The cPCI cartridges house the computer units of the exchange. The cPCIcartridges connect to the Message Bus and they use the cPCI bus forcommunication between the plug-in units in the same cartridge. The plug-in unitsin the cPCI cartridges connect to the motherboards of the cartridges through HardMetric connectors, which are designed in accordance with the IEC 1076-4-101standard. Empty plug-in unit slots of the cPCI cartridges are covered with dummypanels. The cPCI cartridges come in three sizes:

. 1/2�shelf cartridge, comprising type CM2C-A

. 1/3-shelf cartridge, comprising type CC3C-A

. 1/4-shelf cartridge, comprising type CC4C-A.

Figure 5. cPCI cartridge and the cartridge shelf

Non-cPCI cartridges

The non-cPCI cartridges are those housing units not equipped with the cPCI bus,for example, the Exchange Terminals, Interworking equipment, clock equipmentand the duplicated Group Switch. The plug-in units in the non-cPCI cartridgesconnect to the motherboards of the cartridges by means of standardEuroconnectors. The non-cPCI cartridges come in three sizes:

M4 x 10

DN9836707




. 1/2-shelf cartridge, comprising type ET4C-B

. 1/4-shelf cartridge, comprising type SW10C-A, SW1C-C

. 1/6-shelf cartridges, comprising type CLOC-B.

3.3 Plug-in units

There are approximately 20 different plug-in units used in the BSC3i, includingthe ANSI and ETSI variants of ET4 / ET2 plug-in units. In addition, there are twocombinations of a mass memory and an adapter: WDU (WDW18-S, WDW36, orWDW73) with an HDPU-A and MO91 with an ODPU-A. The printed wiringboards of the plug-in units are multi-layered and covered with a protectivecoating. High quality Hard Metric, SMB, RJ-45 and Euroconnectors are used asconnectors. Both surface-mounted and through-hole components are used. Theplug-in units fall in two categories: cPCI plug-in units and non-cPCI plug-inunits.

Mechanical construction of cPCI plug-in units

The cPCI plug-in units are designed according to advanced constructionprinciples based on the IEEE P1101.10 standard. The cPCI environment setssomewhat stricter requirements for the construction of the hardware than that of astandard computer cartridge.

For example, the insertion and extraction forces to be managed when installing orremoving the cPCI plug-in units are considerably greater than they are for the'normal' plug-in units. This is due to the higher number of connector pins neededfor establishing the connection via the cPCI. For a single plug-in unit, the force tobe managed may be as high as 400 N, equal to the weight of 41 kilograms. Toovercome such forces, the cPCI plug-in units are equipped with attachment andremoval handles at the top and bottom of the front plate for easy installation.

The front panels of the units are made of aluminium or aluzinc plated steel metal.In addition to durability, particular attention has been paid to logical and user-friendly design, with systematical positioning of the LED indicators and switchesfor easy operation and monitoring of the unit's condition.

As a general rule, connectors for cables entering the equipment in the cPCIcartridges are placed on the motherboards of the cartridges; only connectors forService Terminals, which are needed only for temporary use, are located on thefront panels of the plug-in units.

The printed boards of the cPCI plug-in units are all of an equal size: 233.4 mm x220 mm (9.2 in x 8.7 in).



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Figure 6. Example of cPCI plug-in units CP710-A, PSC6-A, and MBIF-B

Mechanical construction of non-cPCI plug-in units

The mechanical construction of non-cPCI plug-in units is based on principlesfamiliar from previous generations of DX 200 products. The non-cPCI plug-inunits are equipped with lock springs for easy and firm installation in thecartridges.

The non-cPCI plug-in units come in a single or double Eurocard size:

OPR

ON

OFF

OPR

DN01195329

DBG

RST

J7

J6

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPCI

SCSI

ETx0

ERx0

ETx1

ERx1




. 100 mm x 220 mm (3.9 in x 8.7 in)

. 110 mm x 220 mm (4.3 in x 8.7 in); or

. 233.4 mm x 220 mm (9.2 in x 8.7 in).

Figure 7. Example of non-cPCI plug-in units CL3TG, SW128B, and ET4

3.4 Cabling

The cabling of a BSC3i consists of intracabinet cables and external cables.

FCTRL

4

2

1

FCTRL

DN0492806

3

2

1

0

0

1

2

3

OPR

SB1-0

SB1-1



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The intracabinet cables comprise all the cables inside each cabinet and betweenthe cabinets which form a single network element. They are cut to length andequipped with connectors of either Hard Metric or Euroconnector type.

The external cables include:

. E1/T1 cables

. external alarm cables

. power supply cables

. grounding cables

. I/O cables

. LAN/Ethernet cables; and

. X.25 cables.

The general cabling principle for the BSC3i network element is as follows: allcables except power cables entering the BSC3i cabinet are grounded

. at the cabling panels with grounding outlets (CPGO; X.25, trunk circuitcables, and an alternative external alarm input cable)

. at the CPRJ45 connector panel (all other cables)




4 BSC3i cabinet configuration andcapacity

This section describes the dimensions and configurations of the BSCC cabinet.The expansion of BSC3i's capacity is presented through capacity steps.


4.1 BSC3i cabinet descriptions

The BSC3i features the cabinet BSCC. The equipment configurations aredescribed in more detail in the sections that follow.

The BSCC cabinet has fixed cartridge configuration. Although it may be onlypartially equipped if the customer does not need to utilise the full BSC3i capacity,each cartridge in the cabinet accepts a functional unit of only certain type. Allcartridges are installed in the cabinets at the factory.

Cabinet dimensions

The dimensions of the BSCC (IC209-A) cabinet are (H × W × D) 2000 mm × 900mm × 600 mm. The depth of the cabinet doors is included in the depth measure.

When installed, the cabinet stands on approximately 50-mm-high (2 in)adjustable feet or rails. Above the cabinet row, a free space of at least 500 mm(19.7 in) is required to ensure efficient ventilation.

For more information on the row layout of the cabinets, see section Equipmentroom layout.

Functional unit configuration

The BSCC cabinet contains, among other units, the functional units which handlethe key operation and maintenance tasks in the BSC3i. The BSC3i alwaysfeatures one BSCC cabinet and its maximum configuration is:



31 (98)

BSC3i cabinet configuration and capacity

. two Power Distribution and Fuse Units PDFU-B or four PowerDistribution and Fuse Units PDFU-A

. two Bit Group Switches GSW1KB / GSWB installed in SW10C-A /SW1C-C cartridges

. two Clock System Units (CLS) installed in a CLOC-B cartridge

. up to seven Base Station Controller Signalling Units (BCSU) with packetcontrol units installed in CC3C-A cartridges

. two Marker and Cellular Management Unit (MCMU) installed in CC4C-Acartridges

. one Operation and Maintenance Unit (OMU) installed in CM2C-Acartridge

. up to 64 Exchange Terminal Plug-in Units (64 ET4/ET2 units withGSW1KB/S11.5 or 62 ET2 units with earlier configurations)

. four LAN switches (ESB26 / ESB20-A) installed in the CC4C-A cartridgeswith the MCMU

. four Fan Trays (FTRB) for forced ventilation.

Figure Equipping of the BSCC cabinet (with GSW1KB group switch) presentsthe configuration of the BSCC cabinet (S11.5 BSC3i first delivery or S11.5BSC3i upgrade) with GSW1KB and ET4s. The second figure shows theconfiguration with the GSWB group switch and ET2s. For more detailedinformation on functional units, see Functional unit descriptions.




Figure 8. Equipping of the BSCC cabinet (with GSW1KB group switch)

Note

S11.5 first delivery BSCC cabinet is equipped with PDFU-B power distributionunit.

FTRB FTRB

FTRB FTRB

DN04191848

PDFUPDFU PDFU PDFU

CPGOCPGO CPRJ45

BSCC

CLS0,1

GSW1KB1

GSW1KB0

BCSU6

MCMU1

MCMU0

OMU

BCSU1

BCSU0

BCSU2

BCSU4

BCSU3

BCSU5

ET4C0

(32*ET4E/A)

ET4C1

(32*ET4E/A)



33 (98)


Figure 9. Equipping of the BSCC cabinet (with GSWB group switch)

Connector Panel (CPRJ45) and Cabling Panel with Grounding Outlets(CPGO)

There are three holes at the top of the BSCC cabinet. The Connector Panel(CPRJ45) is located in the middle and the two cabling panel with groundingoutlets (CPGO) on both sides.

FTRB FTRB

FTRB FTRB

DN01195356

PDFUPDFU PDFU PDFU

CPGOCPGO CPRJ45

BSCC

CLS0,1

GSWB1

GSWB0

BCSU6

MCMU1

MCMU0

OMU

BCSU1

BCSU0

BCSU2

BCSU4

BCSU3

BCSU5

ET4C0

(32*ET2E/A)

ET4C1

(30*ET2E/A)




The CPRJ45 is used for providing external LAN connections, serial connections,external synchronisation input connections and external alarm connections. TheCPGO is used for lead-in for external cables (ET cables, X.25 cables, andoptional external input-type alarm cables). The sheaths of all external cables (E1/T1 cables and X.25 cables and optional alarm cables) must be grounded at CPGOwhen they leave or enter the cabinet. The cables are stripped, and the EMC gasketclamps the cable sheaths against the panel body.

The Connector Panel is installed at factory, whereas the cabling panels withgrounding outlets are installed at the site.

Cover for Cable Conduit (COCC)

The Cover for Cable Conduit (COCC) is used in the BSCC cabinet to protect andsection out the power supply equipment.

Power Distribution Fuse Unit (PDFU-B / PDFU-A)

To ensure 2n redundancy for the power distribution lines, the BSC3i cabinet isprovided with two PDFU-B or four PDFU-A units located at the top of thecabinet, above the top shelf. Each PDFU-B /-A forms an independent feedinginput branches consisting of circuit breakers, diodes, filters, and fuses.

Fan Tray (FTRB)

To ensure forced cooling, the BSCC cabinet is equipped with four Fan Trays(FTRB), each of which contains three fans. The FTRBs are located in pairs abovethe shelf housing BCSUs 0 to 2 (FTRBs 0 and 1) and below the shelf housingBCSUs 3 to 5 (FTRBs 2 and 3).

Cover Plate (COP48T) and Shim Plate (SHIM4T)

The IC209-A cabinet is designed to use forced cooling. To achieve sufficientcooling capacity and upward air flow, the non-equipped CC3C-A cartridgeshousing the BCSU units and/or the individual plug-in unit slots are to be covered.Two types of cover plates are used for this purpose: empty CC3C-A cartridges areequipped with Cover Plates (COP48T) and empty plug-in unit slots with ShimPlates (SHIM4T). The COP48T is 48Twide and the front panel of the SHIM4T is4T wide.

Note

The number of BCSUs used determines the number of COP48Ts needed. Whenall BCSUs are installed, that is, when the number of TRXs is 660, COP48Ts areno longer needed.



35 (98)


4.2 Capacity steps of the BSCC

Owing to its modular hardware structure, the BSC3i can be flexibly configured tomeet the capacity requirements of individual customers. The call handlingcapacity of a network element depends, on one hand, on the number of callcontrol computer units in the system, and on the other hand, on its PCM capacity.When it is necessary to increase the capacity, the system can be easily expandedby simply adding new units to the existing configuration.

The minimum configuration of the BSC3i features one BSCC cabinet with aminimum number of BCSU functional units, that is, two BCSUs.

The following figures present the configuration steps from step one to step six.Each step is 110 TRXs.




Figure 10. Configuration steps one, two and three (each step 110 TRXs)

DN01195731

FTRB FTRB

FTRB FTRB

PDFU PDFU PDFU PDFU

CPGO CPRJ45 CPGO

BSCC

GSW1KB0

GSW1KB1

CLS0,1

COP48T

OMUMCMU

0MCMU

1

BCSU0

BCSU1

(32*ET4E/A)

ET4C0

(32*ET4E/A)

ET4C1

FTRB FTRB

FTRB FTRB

PDFU PDFU PDFU PDFU

CPGO CPRJ45 CPGO

BSCC

GSW1KB0

GSW1KB1

CLS0,1

COP48T

OMUMCMU

0MCMU

1

BCSU2

BCSU0

BCSU1

(32*ET4E/A)

ET4C0

(32*ET4E/A)

ET4C1

FTRB FTRB

FTRB FTRB

PDFU PDFU PDFU PDFU

CPGO CPRJ45 CPGO

BSCC

GSW1KB0

GSW1KB1

CLS0,1

COP48T

OMUMCMU

0MCMU

1

BCSU2

BCSU0

BCSU1

BCSU3

(32*ET4E/A)

ET4C0

(32*ET4E/A)

ET4C1

Basic configuration(1+1 BCSU; 110 TRX)

2nd configuration step(2+1 BCSU; 220 TRX)

3rd configuration step(3+1 BCSU; 330 TRX)

COP48T

COP48T COP48T COP48T COP48T COP48T COP48T COP48T COP48T



37 (98)


Figure 11. Configuration steps four, five and six (each step 110 TRXs)

DN01195383

FTRB FTRB

FTRB FTRB

PDFU PDFU PDFU PDFU

CPGO CPRJ45 CPGO

BSCC

GSW1KB0

GSW1KB1

CLS0,1

COP48T

OMUMCMU

0MCMU

1

BCSU2

BCSU0

BCSU1

BCSU3

BCSU4

(32*ET4E/A)

ET4C0

(32*ET4E/A)

ET4C1

FTRB FTRB

FTRB FTRB

PDFU PDFU PDFU PDFU

CPGO CPRJ45 CPGO

BSCC

GSW1KB0

GSW1KB1

CLS0,1

COP48T

OMUMCMU

0MCMU

1

BCSU2

BCSU0

BCSU1

BCSU5

BCSU3

BCSU4

(32*ET4E/A)

ET4C0

(32*ET4E/A)

ET4C1

FTRB FTRB

FTRB FTRB

PDFU PDFU PDFU PDFU

CPGO CPRJ45 CPGO

BSCC

GSW1KB0

GSW1KB1

CLS0,1

OMUMCMU

0MCMU

1

BCSU2

BCSU0

BCSU1

BCSU5

BCSU3

BCSU4

(32*ET4E/A)

ET4C0

(32*ET4E/A)

ET4C1

4th configuration step(4+1 BCSU; 440 TRX)



BCSU6

COP48T




5 Functional unit descriptions for BSC3i

The functional unit types of the BSC3i are described in the following sections.Each description includes the information on the basic configuration of thefunctional unit and the expansion possibilities, if such exist. The descriptions arepresented in alphabetical order. The following functional units are used in theBSC3i:

. Base Station Controller Signalling Unit, BCSU

. Bit Group Switch, GSW1KB / GSWB

. Clock and Synchronisation Unit, CLS

. Exchange Terminal, ET

. IP interfaces

. Marker and Cellular Management Unit, MCMU

. Message Bus, MB

. Operation and Maintenance Unit, OMU

. Power Distribution Fuse Unit, PDFU


General configuration rules

There are some general rules in configuring the BSC3i:

. Shim Plates are used for covering empty slots in each computer cartridgeand Cover Plates are used to cover empty BCSU cartridges.

. Memory modules are installed into the CPU. In one computer unit onlyone type of memory module needs to be used (256 MB).

. All functional units that are of the same type must have consistentconfiguration.



39 (98)

Functional unit descriptions for BSC3i

5.1 Base Station Controller Signalling Unit (BCSU) inthe BSC3i

Purpose: The BCSU handles those functions of the BSC which are highly dependent on theamount of traffic. It controls the signalling and traffic on both A-interface and Abis-interface and provides access to the GPRS core network - optional feature.

Redundancy: n+1

Type: Computer unit with no sub-units

Number of BCSUs inthe BSC3i:

6+1

Packet control units: Frame Relay (FR) connections to SGSN direction are available forthe PCU2-Ds / PCU-Bs in the BCSU (in slots 06 and 07).

Plug-in units: PSC6-B/-A Power Supply for Cartridge

AS7-C/-B Preprocessor (CCS7; LAPD)

PCU2-D

PCU-B

Packet Control Unit

MBIF-B Message Bus Interface

CP710-A Central Processing Unit

Interfaces: Message Bus Interface

GSW1KB / GSWB

LAPD

CCS7

LAN

The minimum number of BCSUs in the BSC3i (in one BSCC cabinet) is two; themaximum number is seven. The BCSU equipment is housed in the CC3C-Acartridge and the basic configuration includes the plug-in units shown in BCSUequipment in the CC3C-A cartridge.

Note

Please note that due to general N+1 redundancy principle of the fault tolerant DX200 Computing Platform equal amount of AS7 plug in units must be configuredin every BCSU unit. This means that all BCSUs need to include either 3 x AS7-B




units (standard S10.5 configuration) or 1 x AS7-C unit (standard S11configuration). Therefore S10.5 based HW configurations need to be extendedwith S10.5 HW based BCSU extensions. Correspondingly S11 based BCSUextensions are needed for S11 HW based BSC3i.

BCSU S11.5 with AS7-C

Table 3. Plug-in units of the BCSU S11.5 with AS7-C

Position Name Function Standard/Optional

Notes

F01 PSC6-B/-A Power Supply Standard

F02 SHIM4T Shim Plate Standard



F05 AS7-C CCS7 and LAPD Standard

F06 SHIM4T /

PCU2-D /

PCU-B

Shim Plate /

2nd GenerationPacket ControlUnit /

Packet ControlUnit

Standard /

Optional /

Optional

1)

1)

F07 SHIM4T /PCU2-D /PCU-B

Shim Plate / 2ndGenerationPacketControl Unit /Packet ControlUnit

Standard /Optional /Optional

1)

1)

F08 MBIF-B Message BusInterface

Standard 2)


Standard 2)

F10 CP710-A Central Processor Standard

F10 MR256M Memory forCP710-A

Standard



41 (98)


1) If PCU-B or PCU2-D is not equipped in this slot, SHIM4T is equipped.

2) The interchangeability code of the MBIF-B must be the minimum of E withthe AS7C in the same unit.

See Figure BCSU equipment in the CC3C-A cartridge (S11 release level) withsimilar positions of the plug-in units.

BCSU S11.5 with AS7-B

Table 4. Plug-in units of the BCSU S11.5 with AS7-B


Notes

F01 PSC6-A Power Supply Standard


F03 AS7-B CCS7 and LAPD Standard

F04 AS7-B LAPD Standard


F06 SHIM4T /

PCU2-D /

PCU-B

Shim Plate /

2nd generationPacket ControlUnit /

Packet ControlUnit

Standard /

Optional /

Optional

1)

1)

F07 SHIM4T /PCU2-D /PCU-B

Shim Plate / 2ndgeneration PacketControl Unit /Packet ControlUnit

Standard /Optional /Optional

1)

1)


Standard


Standard



Standard




1) If PCU-B or PCU2-D is not equipped in this slot, SHIM4T is equipped.

See Figure BCSU equipment in the CC3C-A cartridge (S10.5) with similarpositions of the plug-in units.

BCSU in S11

Figure 12. BCSU equipment in the CC3C-A cartridge (S11 release level)

Table 5. Plug-in units of the BCSU (S11)


Notes

F01 PSC6-A/-B Power Supply Standard




F05 AS7-C CCS7/LAPD Standard 1)

DN03513563

OPR

PSC60

ON

OFF

MBIF

0

MBIF

1

CPU0

AP

AS72

PCU4

PCU6

PCU3

PCU5

RUN 0 RUN 0

RUN 1RUN 1

OPR OPR

DBG

RST

J6

J7

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPSI

SCSI

ETx1

ETx0

ERx0

ERx1

1 2 3 4 5 6 7 8 9 10



43 (98)


Table 5. Plug-in units of the BCSU (S11) (cont.)


Notes

F06 SHIM4T/PCU-B

Shim Plate /Packet ControlUnit

Standard/Optional

2)

F07 SHIM4T/PCU-B


Standard/Optional

2)


Standard 3)


Standard 3)



Standard

1) In S11, one AS7-C (in slot F05) replaces all earlier three AS7-Bs (F03, F04and F05). Its function is CCS7/LAPD.

2) If PCU-B is not equipped in this slot, SHIM4T is equipped.

3) The interchangeability code of the MBIF-B must be a minimum of E with theAS7C in the same unit.

BCSU in S10.5




The PCU-Bs are optional.

Figure 13. BCSU equipment in the CC3C-A cartridge (S10.5)

Table 6. Plug-in units of the BCSU (S10.5)


Notes



F03 AS7-B CCS7/LAPD Standard 1)

F04 AS7-B LAPD Standard 1)


F06 SHIM4T/PCU-B


Standard/Optional

2)

F07 SHIM4T/PCU-B


Standard/Optional

2)

DN01195402

1 2 4 5 6 73 8 9 10

AP

DBG

RST

J7

J6

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPSI

SCSI

ETx0

ERx0

OPROPR

APAP

OPR

ON

OFF

PSC6

MBIF

0

MBIF

1

CPU

AS72

AS71

AS70

*PCU

4

*PCU

6

ETx1

ERx1

RUN0

RUN1

RUN0

RUN1

*PCU

3

*PCU

5



45 (98)


Table 6. Plug-in units of the BCSU (S10.5) (cont.)


Notes


Standard


Standard



Standard

1) If AS7 is not equipped in this slot, SHIM4T is equipped.

2) If PCU-B is not equipped in this slot, SHIM4T is equipped.

5.2 Bit Group Switch (GSW1KB/GSWB) in the BSC3i

5.2.1 GSW1KB, 1024 PCM Bit Group Switch

Purpose: The duplicated, 1024 PCM Bit Group Switch is the switching fabric ofthe BSC3i. The GSW1KB is housed in two identical SW10C-Acartridges. It conveys the traffic passing through the BSC3i andswitches the tones to the subscribers of the exchange and to thetrunk circuits. It also establishes the needed connections to thesignalling units and the internal data transmission channels, and isresponsible for the submultiplexing functions of the BSC3i.

The operation of the GSW1KB is controlled and supervised by theMarker and Cellular Management Unit (MCMU; SWCOP-A).

Redundancy: 2n

Type: Functional unit, sub-unit of the Marker and Cellular Management Unit

Plug-in units: SW128B Switching Matrix plug-in unit for 128 PCM lines

Interfaces: Switch control bus from Marker and Cellular Management Unit

4 or 8 Mbit/s internal PCM lines

HotLink interface




The equipment of the GSW1KB functional unit is housed in an SW10C-Acartridge. The basic configuration of a GSW1KB in BSC3i includes 4 pieces ofSW128B switching units per SW10C-A cartridge.

Separate power supply plug-in units are not needed in GSW1KB because theSW128B plug-in unit has a built-in power supply.

Due to redundancy requirements, the BSC3i always contains two GSW1KBs.The GSW1KB equipment housed in the SW10C-A cartridge and the basicconfiguration is shown in Figure GSW1KB equipment in the SW10C-A cartridgeand Table Plug-in units of the GSW1KB in an SW10C-A cartridge.

Figure 14. GSW1KB equipment in the SW10C-A cartridge

Table 7. Plug-in units of the GSW1KB in SW10C-A cartridge


F01 SW128B SwitchingNetwork

Standard


Standard

1

DN0486984

2 3 4 5 6 7 8 9

SW128B0

SW128B1

SW128B2

SW128B3

SHIM

4T

SHIM

4T

SHIM

4T

SHIM

4T

SHIM

4T



47 (98)


Table 7. Plug-in units of the GSW1KB in SW10C-A cartridge(cont.)



Standard


Standard






5.2.2 GSWB, 256 PCM Bit Group Switch

Purpose: The duplicated Group Switch (GSWB) 256 is the switching fabric of the BSC3i. TheGSWB is housed in two identical SW1C-C cartridges, and it conveys the traffic passingthrough the BSC3i and switches the tones to the subscribers of the exchange and to thetrunk circuits. It also establishes the needed connections to the signalling units and theinternal data transmission channels, and is responsible for the submultiplexing functionsof the BSC3i.

The operation of the GSWB is controlled and supervised by the Marker and CellularManagement Unit (MCMU; SWCOP-A).

Redundancy: 2n with MCMU

Type: Functional unit, sub-unit of the Marker and Cellular Management Unit

Plug-in units: SW64B Switching Network (8 Bit/s channels)

PSC1-S Power Supply for Cartridge

Interfaces: Switch control bus from Marker and Cellular Management Unit

GSWB PCMs to some computer units, all ETs




Due to redundancy requirements, the BSC3i always contains two GSWBs. TheGSWB equipment is housed in the SW1C-C cartridge and the basic configurationincludes the plug-in units shown in Figure GSWB equipment in the SW1C-Ccartridge and Table Plug-in units of the GSWB in a SW1C-C cartridge.

Figure 15. GSWB equipment in the SW1C-C cartridge

Table 8. Plug-in units of the GSWB in the SW1C-C cartridge


Notes

F00

F01


Standard


Standard


Standard

DN01195426

SW64B

SW64B

PSC1

SW64B

02 03 04 05 060100 07

SW64B



49 (98)


Table 8. Plug-in units of the GSWB in the SW1C-C cartridge (cont.)


Notes


Standard

F02-F05 SWBUS4 Bus Extender Standard *)

F06 PSC1-S Power Supply Standard

*) Connects four SW64B plug-in units to each other.

5.3 Clock and Synchronisation Unit (CLS) in the BSC3i

Purpose: The CLS generates the clock signals necessary for the BSC. The oscillator of the CLS isnormally synchronised to an external source, usually an MSC, through a PCM line. Up totwo additional PCM inputs are provided for redundancy.

Redundancy: 2n

Type: Functional unit with no sub-units

Number of CLSunits in the BSC3i:

2 (one CL3TG plug-in unit contains one entire CLS unit)

Plug-in units: CL3TG Clock and Synchronisation Unit

Interfaces: Synchronisation input

Synchronisation output

External synchronisation input

Wired alarm interface to OMU

The exchange contains two Clock and Synchronisation Units in a CLOC-Bcartridge. The basic configuration is illustrated in Figure Two Clock andSynchronisation Units (CLS) in the CLOC-B cartridge and Table Plug-in units ofthe CLS.




Figure 16. Two Clock and Synchronisation Units (CLS) in the CLOC-B cartridge

Table 9. Plug-in units of the CLS


Notes

F00 CL3TG CLS 0 Standard

F03 CL3TG CLS 1 Standard

The BSC3i always features two independent CLS functional units, that is, twoClock and Tone Generator plug-in units (CL3TG) in one CLOC-B cartridge.

Performance characteristics of CL3TG

In the plesiochronous operation mode, the frequency shift of the CL3TG is 2 x10-8 within each 24-hour period, if the temperature of the environment does notvary.

Number of synchronisation inputs:

DN01195492

CLxT

G0

CLxT

G1

0300



51 (98)


. four from PCM lines

. two external inputs (120 ohm balanced / 75 ohm unbalanced) / 1 externalinput (120 ohm balanced / 75 ohm unbalanced) with the optional ET4s

5.4 Exchange Terminal (ET) in the BSC3i

The exchange terminals must be chosen so that they match the environment thenetwork element will be used in. ETSI versions of the ET plug-in units (forexample, ET4E or ET4E-C) are used in the E1 environment, while the T1environment requires the use of ANSI-version units (for example, ET4A).

The ETs of the BSC3i are housed in ET4C cartridges. ET4C cartridges have twoshelves. One shelf can be housed with ET4s or ET2 units with GSW1KB/S11.5.The selection between ET4s and ET2s is made with the jumpers of the SW128Bunits.

5.4.1 Exchange Terminal ET4

Note

The 1024 PCM bit group switch GSW1KB is a prerequisite for the ET4 exchangeterminals implementation.

Purpose: The Exchange Terminal (ET) performs the electrical synchronisation and adaptation ofexternal PCM lines. It performs the AMI or B8ZS (ET4A), or HDB3 (other ET4 plug-inunits) coding and decoding, inserts the alarm bits in the outgoing direction and producesPCM frame structure.

Redundancy: None

To ensure redundancy for the ET4 plug-in units, we recommend that the ETs interfacingPCMs to the same direction be installed in cartridges or slots fed by different PDFUs.


Plug-in units: ET4E Exchange Terminal with RJ45 connectors (balanced E1interface) in ETSI environment

ET4E-C Exchange Terminal with coaxial connectors (unbalanced E1interface) in ETSI environment

ET4A Exchange Terminal with RJ45 connectors (balanced T1 interface)in ANSI environment




Interfaces: GSW1KB (8 Mbit/s mode)

Control interface from a signalling unit (via GSW1KB/GSWB)

PCM (E1/T1)

Synchronisation

The ETs are housed in ET4C-B cartridges. One ET4C-B cartridge can contain upto 32 ET4E, ET4E-C, or ET4A plug-in units. The total number of the ET plug-inunits in the BSC3i with GSW1KB is 64 (62 with GSWB; 32 in ET4C 0, 30 inET4C 1, total 124 PCMs) and the total number of PCMs is 256.

Note

One ET4E, ET4E-C or ET4A plug-in unit contains four ET functional units.



53 (98)


Figure 17. ET4 equipment in the ET4C-B cartridge

DN0487683

01 1513120907050300 02 04 06 08 10 11 14

17 3129282523211916 18 20 22 24 26 27 30

01 1513120907050300 02 04 06 08 10 11 14

17 3129282523211916 18 20 22 24 26 27 30

ET4E & ET4A

ET4E-C




Table 10. ET4 plug-in units

Position Name Standard/Optional

F0-F31 ET4E / ET4E-C / ET4A

Optional

5.4.2 Exchange Terminal ET2

Purpose: The Exchange Terminal (ET)

The ET performs the electrical synchronisation and adaptation of external PCM lines. Itperforms the AMI or B8ZS (ET2A), or HDB3 (other ET2 plug-in units) coding anddecoding, inserts the alarm bits in the outgoing direction and produces PCM framestructure. All ET2 plug-in units contain two separate ETs but the ET1E plug-in units of thefirst generation BSC contain only one ET.

Redundancy: None

To ensure redundancy for the ET2 plug-in units, we recommend that the ETs interfacingPCMs to the same direction be installed in cartridges or slots fed by different PDFUs.


Plug-in units: ET2E-S/-T Exchange Terminal with Euroconnector (balanced E1 interface) inETSI environment

ET2E-SC/-TC Exchange Terminal with coaxial connectors (unbalanced E1interface) in ETSI environment

ET2A/-T Exchange Terminal with RJ45 connectors (balanced T1 interface)in ANSI environment

Interfaces: GSW1KB / GSWB

Control interface from a signalling unit (via GSW1KB / GSWB)

PCM (E1/T1)

Synchronisation

The ETs are housed in ET4C-B cartridges. One ET4C-B cartridge can contain upto 32 ET2E-T, ET2E-TC or ET2A-T plug-in units. The total number of ET plug-in units in the BSC3i is 62 (32 in ET4C0, 30 in ET4C1) and the total number ofPCMs is 124.

Note



55 (98)


One ET2E-S, ET2E-SC or ET2A plug-in unit contains two ET functional units.

Note

The ET2E/-S plug-in units with balanced interfaces currently in use can bereplaced with totally interchangeable ET2E-T plug-in units, the ET2E-C/-SCplug-in units with unbalanced (coaxial) interfaces can be replaced with ET2E-TCplug-in units, and the ET2A plug-in units can be replaced with ET2A-T plug-inunits in the ANSI environment.

Figure 18. ET equipment in the ET4C-B cartridge

Table 11. The ET plug-in units


Note

F0-F29 ET2E-T/ET2E-TC/ET2A-T

Optional

01 1513120907050300 02 04 06 08 10 11 14

17 3129282523211916 18 20 22 24 26 27 30

DN01195414

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC

ET2A/ET2E-S/SC




Table 11. The ET plug-in units (cont.)


Note

F30, F31 ET2E-T/ET2E-TC/ET2A-T

Optional *)

*) Slots F30 and F31 are not equipped in ET4C-B 1.

5.5 IP interfaces in the BSC3i

The SWU (Switch Unit) refers to the various LAN switch equipment usedregardless of their physical hardware implementation (ESB26 / ESB20-A).

Purpose: The integrated LAN switches are standard in the first deliveries of the BSC3i. Theinterfaces are composed of two ESB26 / ESB20-A plug-in units. The LAN interfaceshave redundant 100 Mbit/s or 1 Gbit/s (ESB26) up-link connections to the IP network.

Redundancy: 2n

Type: Functional unit

Plug-in units: ESB20-A

/

LAN switch unit. 2 uplink 10/100BASE-Tx ports. 18 downlink 10/100BASE-T ports

ESB26 LAN switch unit. 2 uplink 1000BASE-Sx ports. 2 uplink/downlink 10/100/1000BASE-T ports. 2 uplink/downlink 10/100BASE-Tx ports. 20 downlink 10/100BASE-T ports

Interfaces: Uplink interfaces to the IP network (router)

Uplink interfaces to an additional LAN switch via the cabling panel for LANs and serialinterfaces (CPRJ45) in the BSCC cabinet

SWU provides access to the operator's IP network as a first level LAN switch. Itprovides uplink interfaces to the IP network (router) or to an additional LANswitch via the BSC3i connector panel. SWU collects data from the computer andpacket controller units and sends it further to external routers and the IP network



57 (98)


via 1 Gb/s (ESB26 only) or 100 Mb/s uplink connections. Redundant LAN-switch units provide ports of 10/100/1000BaseT/Tx interfaces with RJ45connectors and 1000BaseSx interfaces with LC connectors via the BSC3iconnector panel.

One LAN SWU pair is dedicated to collecting user-plane traffic from packetcontrol units (PCU) and another to collecting data from computer units (CPU).

Figure The LAN connection principle in the BSC3i depicting the LAN SwitchUnits (ESB26 / ESB20-A) in the MCMU cartridges (CC4C-A) clarifies the LANconnection principle.

Figure 19. The LAN connection principle in the BSC3i

Integrated LAN switches (ESB26 / ESB20-A plug-in units) are presented in LANswitches in the MCMU-housing CC4C-A cartridge .

IPNetwork

BCSU 0CPU

BCSU 6CPU

MCMU 0CPU

OMUCPU

MCMU 1CPU

MCMU 0 MCMU 1

BSCU 0 BSCU 6

VRRP

2 x 100 Mbit/suplink

2 x 100 Mbit/suplink

2 x 100 Mbit/s

2 x 100 Mbit/s

EMC interface(connector panel)

100 Mbps

PCU PCU PCU PCU

SWU 1

SWU 3

SWU 0

SWU 2

BSC3i cabinet




Figure 20. LAN switches (ESB26 / ESB20-A) in the MCMU-housing CC4C-Acartridge

Note

In the BSC3i, the LAN switches for the IP interfaces are composed of the twoESB26s / ESB20-As housed in the CC4C-A cartridge with the MCMU functionalunit. The PSC6-A/B provides power supply in the CC4C-A cartridge for theESB units well as the MCMU equipment. See Table Plug-in units of the MCMU-housing SWU units where the LAN switch plug-in units and the power supplyplug-in unit are indicated by the use of emphasised font.

Table 12. Plug-in units of the MCMU-housing SWU units


Notes


F02 ESB26 /ESB20-A

Ethernet Switchwith 26 / 20 ports

Standard 1)

1 2 4 5 6 73

DBG

RST

J7

J6

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPSI

SCSI

ETx0

ERx0

OPROPROPR

ON

OFF

PSC6

MBIF

0

MBIF

1

CPU

SWCOP

ETx1

ERx1

DN0487753

OPROPR

RSTRST

ESB



59 (98)


Table 12. Plug-in units of the MCMU-housing SWU units (cont.)


Notes

F03 ESB26 /ESB20-A

Ethernet Switchwith 26 / 20 ports

Standard 1)

F04 SWCOP-A Switch ControlProcessor

Standard


Standard


Standard

F07 CP710-A CentralProcessor

Standard


Standard

1) Up-links are either 100 Mbit/s or 1 Gbit/s when using ESB26.

SWU for CPU LAN

CC4C-A(MCMU 1)

CC4C-A(MCMU 0)

BSCC

LAN

UPLINK

UPLINK

IPNETWORK

NE boundary

CPU

MCMU0

CPU

BCSU0

CPU

OMU

MESSAGEBUS

ESB

ESB

DN03505914

*)




ESB20-A: the Rapid Spanning Tree Protocol (RSTP) is enabled in the LANsubnetwork and the redundancy cables are left connected.

Figure 21. CPU LAN architecture

SWU for PCU LAN

ESB20-A: the Rapid Spanning Tree Protocol (RSTP) is enabled in the LANsubnetwork and the redundancy cables are left connected.

Figure 22. PCU LAN architecture

Internal LAN management

Figure Overview of internal LAN management in BSC3i illustrates internal LANmanagement in the network element.

CC4C-A(MCMU 1)

CC4C-A(MCMU 0)

BSCC

LAN

UPLINK

UPLINK

IPNETWORK

NE boundary

PCU

MESSAGEBUS

ESB

ESB

BCSU0

PCU

PCUBCSU1

PCU

PCUBCSU

6

PCU

DN03505938

*)



61 (98)


*) These 2 pcs of LAN cables (required for internal LAN management) are forchaining the two ESBs in the same MCMU.

**) LAN Device integration SW distribution channel

Figure 23. Overview of internal LAN management in BSC3i

CC4C-A(MCMU 1)

CC4C-A(MCMU 0)

ESB

BSCC

UPLINK

UPLINK

ESB

IPNETWORK

CPU

CPU

CPU

MCMU

BCSU

OMU

ESB

LAN

UPLINK

UPLINK

ESB

IPNETWORK

NE boundary

MESSAGEBUS

CC4C-A(MCMU 1)

CC4C-A(MCMU 0)

BCSU0

PCU

PCU

PCU

PCU

PCU

PCU

BCSU1

BCSU6

MESSAGEBUS

DN03505953

**)

**)

*)

**)

**)

*)




5.6 Marker and Cellular Management Unit (MCMU) inthe BSC3i

Purpose: The MCMU controls and supervises the GSW1KB/GSWB and performs the hunting,connecting and releasing of the switching network circuits. The range of the tasks ithandles makes up a combination of general marker functions and radio resourcemanagement functions.

The MCMU is connected to the other computer units of the network element, OMU andBCSU, through the message bus.

Redundancy: 2n

Type: Computer unit with no sub-units


SWCOP-A Switch Control Processor




GSW1KB / GSWB

Lb interface

The BSC3i always contains two MCMUs. The MCMU equipment is installed ina CC4C-A cartridge and the basic configuration includes the plug-in units shownin MCMU equipment in the CC4C-A cartridge.



63 (98)


Figure 24. MCMU equipment in the CC4C-A cartridge

Table 13. Plug-in units of the MCMU



F04 SWCOP-A Switch ControlProcessor

Standard


Standard


Standard

F07 CP710-A CentralProcessor

Standard


Standard

See Functional unit descriptions for BSC3i.

1 2 4 5 6 73

DBG

RST

J7

J6

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPSI

SCSI

ETx0

ERx0

OPROPROPR

ON

OFF

PSC6

MBIF

0

MBIF

1

CPU

SWCOP

ETx1

ERx1

DN0487753

OPROPR

RSTRST

ESB




5.7 Message Bus (MB) in the BSC3i

Purpose: The MB is the physical connection between the computer units of the network element. Itis controlled by the Message Bus Interface plug-in units (MBIF-B) located in everycomputer unit.

Redundancy: 2n


Plug-in Units MBIF-B in every computer unit

Interfaces: Host computer units of the MBIF-Bs

The duplicated Message Bus has a transfer rate of 32 Mb/s. It is controlled by theMessage Bus Interface plug-in unit (MBIF-B), which also acts as a bi-directionalinterface between the microcomputer and the 16-bit parallel Message Bus.

The power supply to the Message Bus terminal resistors at each end of the bus isbacked up by means of a cable which runs between the cartridge housing theterminal resistor and another cartridge on the same shelf.

The path of the message bus through the computer units and the placement of thepower supply back-up cable is shown in Figure Message bus (MB). The figurealso shows the placement of the MB connectors and terminators on the backplane of the cartridge, as well as the power supply back up cables to the MBterminators.

The path of the Message Bus and the placement of the MB connectors on theback plane of the cartridge. The power supply to the terminal resistors at the endof each bus is backed up by means of a cable between the terminals PP2 (inBCSU 0 / in BCSU 1/ in MCMU 0 / in MCMU 1).



65 (98)


Figure 25. Message bus (MB)

5.8 Operation and Maintenance Unit (OMU) in BSC3i

Purpose: The Operation and Maintenance Unit (OMU) acts as an interface between the user andthe BSC3i and takes automatic recovery measures on the basis of its collected faultdata when required. The tasks of the OMU can be divided into five groups:

" LAN supervision and LAN topology management

" traffic control functions

" maintenance functions

" system configuration administration functions

..............................................................................................................................................................................................................................................................................................................................................................

::::::::::::::::::::::::::::::::::

::::::::::::::::::::::::::::::::::

J2 J1

..............................................................................................................................................................................................................................................................................................................................................................

::::::::::::::::::::::::::::::::::

::::::::::::::::::::::::::::::::::

J2 J1

MCMU 1 MCMU 0

BCSU 0

BSCC

CLS

0,1 Group

SwitchGroupSwitch

MCMU0

BCSU3

BCSU4

BCSU5

ET4C1

REAR SIDE

ET4C0

BCSU0

BCSU1

BCSU2

MCMU1

OMU

BCSU6

..............................................................................................................................................................................................................................................................................................................................................................

::::::::::::::::::::::::::::::::::

::::::::::::::::::::::::::::::::::

J2 J1

..............................................................................................................................................................................................................................................................................................................................................................

::::::::::::::::::::::::::::::::::

::::::::::::::::::::::::::::::::::

J2 J1

BCSU 1

PDFU PDFU PDFU PDFU

MBUS connector

MBUS terminator TRM9BDN0264018




" system management functions.

The OMU has dedicated storage devices, which serve as a storage, for example, for theentire system software of the exchange as well as for the event buffer for intermediatestoring of alarms.

Redundancy: -

Type: Computer unit, with a storage device unit as a sub-unit


AS7-C/-B Preprocessor (LAPD and clock control channel)

AC25-A Adapter for Communication X.25

SERO-A Serial Interface

HWAT-A Hardware Alarm Terminal



ODPU-A + MO91 Optical Device Plug-in Unit

HDPU-A + WDU(WDW18-S, WDW36,WDW73)

Hard Disk Plug-in Unit


GSW1KB / GSWB

LAN

Wired Alarm Interface

External Alarm Interface

Interface to External Alarm Unit (EXAU)

Clock control channel

Serial Interface (VDU and LPT)

LAPD/Q1

The network element contains one OMU � so there is no redundancy.

S11.5 First delivery

In S11.5 the OMU equipment is housed in the CM2C-A cartridge. Digital X.25alternative includes three AS7-Cs (in slots 3, 4, and 5). Analog X.25 alternativeincludes one AS7-C (in slot 3) and two AC25-As (in slots 4 and 5).



67 (98)


The basic configuration is presented in Figures OMU equipment in the CM2C-Acartridge, AS7-C alternative (S11.5),OMU equipment in the CM2C-A cartridge,AC25 alternative and Table Plug-in units of the OMU, S11.5).

Figure 26. OMU equipment in the CM2C-A cartridge, AS7-C alternative (S11.5)

1 2 4 5 6 73 8 9 10

AP

DBG

RST

J7

J6

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPSI

SCSI

ETx0

ERx0

OPROPR

APAP

OPR

ON

OFF

PSC60

MBIF

0

MBIF

1

CPU0

SERO

0

HWAT3

ETx1

ERx1

FDU

WDU0

WDU1

12 13 14

SW0

SW1

RST

DN03499356

POWER OFF

OFF

POWEROFF

POWEROFF

OFF OFF

AS70

AS71

AS72




Figure 27. OMU equipment in the CM2C-A cartridge, AC25 alternative

Table 14. Plug-in units of the OMU, S11.5

Position Name Function Equipment Notes

F1 PSC6-B/-A PowerSupply

Standard

F2 SHIM4T Front panelwith shimplate

Standard

F3 AS7-C Q1 / LAPD Standard

F4 SHIM4T /AS7-C /AC25-A

Front panelwith shimplate /NMS /dig. X.25 /NMS /Analog. X.25

Standard/Optional/Optional

1); 3)


Front panelwith shimplate /NMS /dig. X.25 /


1); 3)

1 2 4 5 6 73 8 9 10

AP

DBG

RST

J7

J6

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPSI

SCSI

ETx0

ERx0

OPROPR

AP

AP

OPR

ON

OFF

PSC60

MBIF

0

MBIF

1

CPU0

SERO

0

HWAT3

ETx1

ERx1

FDU0

WDU

0

WDU

1

12 13 14

SW0

SW1

RST

POWER OFF

OFF

POWEROFF

POWEROFF

OFF OFF

AS70

DN0487695

AC251

AC252



69 (98)


Table 14. Plug-in units of the OMU, S11.5 (cont.)


NMS /Analog. X.25

F6 SERO-B/-A V.11 andV.24Interface

Standard 4)

F7 HWAT-A HardwareAlarmTerminal

Standard

F8 MBIF-B MessageBusInterface

Standard 2)


Standard 2)

F10 CP710A CentralProcessor

Standard

F10 MR256M Memory forCP710-

Standard

F12 ODPUA OpticalDevice Plug-in Unit

Standard Adapter for FDD 0

F12 MO91 MagnetoOptical DiskDrive

Standard FDD 0

F13 HDPUA Hard DiskPlug-in Unit

Standard Adapter for HDD 0

F13 WDW73 Hard DiskDrive

Standard HDD 0




Standard HDD 1




1. If no AS7-C or AC25-A is equipped, SHIM4T remains equipped in thisslot.

2. The minimum interchangeability code of the MBIF-B is E when the AS7-C is equipped in the same unit.

3. The one 4 Mbit/s is used together with another Dig. X.25 interface AS7-Cin an adjacent slot.

4. SERO-B from 2006 onwards.

S11 First delivery and upgrade

In S11, the OMU equipment is housed in the CM2C-A cartridge and the basicconfiguration includes the following plug-in units presented in Figure OMUequipment in the CM2C-A cartridge, S11 and Table Plug-in units of the OMU,S11.

Figure 28. OMU equipment in the CM2C-A cartridge, AS7-C alternative (S11)

Digital X.25 alternative includes three AS7-Cs (in slots 3, 4, and 5). Analog X.25alternative includes one AS7-C (in slot 3) and two AC25-As (in slots 4 and 5).

The upgraded OMU (dig.X.25) includes one AS7-B (in slot 3) and two AS7-Cs(in slots 4 and 5).

1 2 4 5 6 73 8 9 10

AP

DBG

RST

J7

J6

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPSI

SCSI

ETx0

ERx0

OPROPR

APAP

OPR

ON

OFF

PSC60

MBIF

0

MBIF

1

CPU0

SERO

0

HWAT3

ETx1

ERx1

FDU

WDU0

WDU1

12 13 14

SW0

SW1

RST

DN03499356

POWER OFF

OFF

POWEROFF

POWEROFF

OFF OFF

AS70

AS71

AS72



71 (98)


Table 15. Plug-in units of the OMU, S11


F1 PSC6-B/-A PowerSupply

Standard

F2 SHIM4T Front panelwith shimplate

Standard

F3 AS7�C/AS7�B Q1 / LAPD Standard




1)




1)

F6 SERO-A V.11 andV.24Interface

Standard

F7 HWAT-A HardwareAlarmTerminal

Standard


Standard 2)


Standard 2)

F10 CP710A CentralProcessor

Standard

F10 MR256M Memory forCP710-

Standard

F12 ODPUA OpticalDevice Plug-

Standard Adapter for FDD 0




Table 15. Plug-in units of the OMU, S11 (cont.)


in Unit

F12 MO91 MagnetoOptical DiskDrive

Standard FDD 0




Standard HDD 0



F14 WDW73 / WDW36 Hard DiskDrive

Standard HDD 1

1. If no AS7-C or AC25-A is equipped, SHIM4T remains equipped in thisslot.

2. The minimum interchangeability code of the MBIF-B is E when the AS7-C is equipped in the same unit.

The OMU cartridge (CM2C-A) houses a duplicated Adapter and Hard Disk Drivecombination (HDPU-A + WDW36 or WDW73) and an adapter and MagnetoOptical Disk Drive combination (ODPU-A + MO91). The former functions as asystem disk unit, and the latter is used for facilitating temporary serviceoperations, for example, data updates and downloads. In the software, the unitname for the Adapter and Hard Disk Drive combination is WDU, and for theAdapter and Magneto Optical Disk Drive, it is FDU.

S10.5 First delivery

In S10.5 the OMU equipment is housed in the CM2C-A cartridge and the basicconfiguration includes the following plug-in units presented in Figure OMUequipment in the CM2C-A cartridge, S10.5 and Table Plug-in units of the OMU,S10.5.



73 (98)


Figure 29. OMU equipment in the CM2C-A cartridge, S10.5

Table 16. Plug-in units of the OMU in BCS3i, S10.5



F02 SHIM4T Front panel with Shim plate Standard

F03 AS7-B Q1/LAPD Standard

F04 SHIM4T/ AS7-B/AC25- A

Front panel with Shim plate/ NMS, Digital X.25 / NMS,Analog X.25


1)

F05 SHIM4T/ AS7-B/AC25- A

Front panel with Shim plate/ NMS, Digital X.25 / NMS,Analog X.25


1)

F06 SERO-A V.11 and V.24 Interface Standard

F07 HWAT-A Hardware Alarm Terminal Standard

F08 MBIF-B Message Bus Interface Standard

1 2 4 5 6 73 8 9 10

AP

DBG

RST

J7

J6

WO

RUN

LF

OL

TE

AP

DRAM

SB

CPSI

SCSI

ETx0

ERx0

OPROPR

APAP

OPR

ON

OFF

PSC6

MBIF

0

MBIF

1

CPU

AS72

AS71

AS70

SERO

HWAT

ETx1

ERx1

FDU

WDU

0

WDU

1

12 13 14

SW0

SW1

RST

DN01195441




Table 16. Plug-in units of the OMU in BCS3i, S10.5 (cont.)


F09 MBIF-B Message Bus Interface Standard


F10 MR256M Memory for CP710- A Standard

F12 ODPU-A Optical Device Plug-in Unit Standard Adapter for FDD 0

F12 MO91 Magneto Optical Disk Drive Standard FDD 0

F13 HDPU-A Hard Disk Plug-in Unit Standard Adapter for HDD 0

F13 WDW73 /WDW36 /WDW18-S

Hard Disk Drive Standard HDD 0

F14 HDPU-A Hard Disk Plug-in Unit Standard Adapter for HDD 1

F14 WDW73 /WDW36 /WDW18-S

Hard Disk Drive Standard HDD 1

1. If AS7-B or AC25-A is not equipped, SHIM4T is used in this slot.

5.9 Power Distribution Fuse Unit (PDFU) in the BSC3i

Purpose: The Power Distribution Fuse Unit (PDFU) distributes the -48V/-60V DC power from thesite power system to the cartridges through the distribution cables. The PDFU alsocontains the fuses for these cables, along with alarm circuits for the incoming voltagesand its own fuses.

Redundancy: 2n

Type: Functional Unit with no sub-units

Plug-in units: PDFU-B / PDFU-A Power Distribution Fuse Unit

Interfaces: Supply interfaces to cartridges and site power system

Wired alarm interface

The PDFU-B is introduced at system level S11.5.



75 (98)


To ensure 2n redundancy for the power distribution lines, the BSC3i cabinets areprovided with two PDFU-B or four PDFU-A units, which are located in the upperpart of the cabinet and installed at the factory. One PDFU-B contains twoindependent functional units within one case, A and B. The feed cables are alsoduplicated.

Each half of PDFU-B and each PDFU-A forms an independent feeding inputbranch consisting of:

. connectors and circuit breakers for the incoming power cables

. an integrated filter for EMC protection

. connectors for alarm and outgoing power cables

. fuses for outgoing distribution cables

- each half of a PDFU-B contains ten fuses

- the PDFU-A contains eight fuses

. indicators for blown fuses.

The circuit breakers for the incoming power cables have a 30A rating for PDFU-B and 20A rating for PDFU-A and the fuses for the outgoing distribution cables a10 A rating (Use Nokia part with manufacturer code 10511 20121).




Figure 30. The two PDFU-B units at the top of the BSCC cabinet

DN0443376

F10 F11 F12 F13 F14 F15 F16 F17 F18 F19F0 F1 F2 F3 F4 F5 F6 F7 F8 F9

1 0 1 0

-UB 0-UB 1

A1 0 1 0

-UB 0-UB 1

B



77 (98)


Figure 31. The four PDFU-A units at the top of the BSCC cabinet

Power supply to the cabinets

The power feed cables from the site power system to the BSCC cabinets areduplicated, with both supply lines connecting to both PDFU-Bs (0 and 1) or to allPDFU-As (0 3) in the BSCC cabinet. Each cabinet has supply cables of theirown.

Power supply to the cartridges

On cabinet level, the operating voltages are fed to the cartridges housing thefunctional units backing up each other through separate distribution lines,following the principles listed below and illustrated in Figures Power distributiondiagram of the BSCC cabinet with PDFU-Bs and Power distribution diagram ofthe BSCC cabinet with PDFU-As.

PDFU-B

DN00294796

F0 F1 F2 F3 F4 F5 F6 F7

-UB 0

1 0

-UB 1

1 0

PDFU-A




. In some cartridges, each plug-in unit makes up a functional entity of itsown. These cartridges do not have any power supply plug-in unit. Instead,the plug-in units are equipped with onboard DC/DC converters, and onehalf of the cartridge is fed by one PDFU-B while the other half is fed by theother. In the following figure, these types of cartridges are referred to as'type 1' cartridges. They include the ET4C-B and CLOC-B cartridges.

. Some of the cartridges do not have a power supply plug-in unit butonboard DC/DC converters in the plug-in units, and the whole cartridge isfed by one of the two PDFU-Bs. There is also an equal cartridge forbackup that is fed by the other PDFU-B. In the following figure, thesetypes of cartridges are referred to as 'type 2' cartridges. They include theSW10C-A cartridges.

. There are also cartridges that are equipped with one power supply plug-inunit which feeds the other equipment in the cartridge.The redundancy ofthe power feed is achieved by supplying functional units backing up eachother through separate PDFU-Bs. In the following figure, these types ofcartridges are referred to as 'type 3' cartridges. They include the CC3C-Aand CC4C-A cartridges.



79 (98)


Figure 32. Power distribution diagram of the BSCC cabinet with PDFU-Bs

==

==

TYPE 3

cartridge

TYPE 2

cartridge

TYPE 3

cartridge

GROUNDBAR OFTHE SITE

TYPE 1

cartridge

TYPE 2

cartridge

DX 200CABINET(IC209-A)

RECTIFIERSYSTEMANDBATTERIES

PDFU-B0

PDFU-B1

DN0493123

+

==

==

==

==

==

==

==

==

Input 0 Input 1 Input 0 Input 1




PDFU-A

. In some cartridges, each plug-in unit makes up a functional entity of itsown. These cartridges do not have any power supply plug-in unit. Instead,the plug-in units are equipped with onboard DC/DC converters, and onehalf of the cartridge is fed by one PDFU-Awhile the other half is fed by theother. In the following figure, these types of cartridges are referred to as'type 1' cartridges. They include the ET4C-B and CLOC-B cartridges.

. The other cartridges are each equipped with one power supply plug-in unitwhich feeds the other equipment in the cartridge. The redundancy of thepower feed is achieved by supplying functional units backing up each otherthrough separate PDFU-As. In the following figure, these types ofcartridges are referred to as 'type 2' cartridges.

Figure 33. Power distribution diagram of the BSCC cabinet with PDFU-As

==

==

==

==

GROUNDBAR OFTHE SITE

TYPE 1

cartridge

TYPE 2

cartridge

DX 200CABINET(IC209-A)

TYPE 2

cartridge

RECTIFIERSYSTEMANDBATTERIES

PDFU-A0

PDFU-A1

PDFU-A2

PDFU-A3

DN01130697

+



81 (98)


Supply cables from the rectifiers to the cabinets

The principle of power supply to the BSCC cabinet is presented in Figures Powersupply to the BSCC cabinet.

Figure 34. Power supply to the BSCC cabinet with PDFU-B

Figure 35. Power supply to the BSCC cabinet with PDFU-A

Power supply to the Fan Trays (FTRB units)

The BSCC cabinet is equipped with four Fan Trays (FTRB), each of whichcontains three fans. Each FTRB is powered by a separate PDFU. The fans are n+1/L redundant, meaning that if one of them fails, the remaining 11 fansautomatically start to operate at maximum speed, which is enough to providesufficient cooling.

BSCC

= Twin wires

PDFU-B0

PDFU-B1 R

ECTIFIERS/BATTERIES

+UB/-UB0+UB/-UB1

DN0487702

BSCC

= Twin wires

PDFU-A0

PDFU-A1

PDFU-A2

PDFU-A3 R

ECTIFIERS/BATTERIES

+UB/-UB0+UB/-UB1

DN0263946




6 Overview of the BSC3i installation site

This section briefly describes the equipment room layout and some basicrequirements for the premises. For further information on the cables and cablestructures, see Installation Site Requirements for BSC3i.


6.1 Equipment room layout

Each cabinet should be located in the equipment room with free space of at least900 mm (35.4 in.) both at the front and the back, and at least 500 mm (20 in.)between the end of a cabinet row and the wall. The recommended space betweenthe cabinet rows is 1000 mm (39.4 in.) or, when the equipment room has a raisedfloor, 1200 mm (47.2 in.). Any deviations from the above must be agreed uponindividually.

In layout planning, the following aspects should be considered:

. cable structures for the power supply and PCM circuit cables

. room for expansion cabinets

. room for maintenance between two two-cabinet units with SCCs (when theequipment room has raised floor)

. free space above the cabinet rows (height at least 500 mm, or 20 in.).

The measurements of the BSC3i and the required distances from the walls isshown in Figure Space requirements of the BSC3i network element.



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Overview of the BSC3i installation site

Equipment room with a raised floor: Side Cable Conduit, SCC, is equipped.Cabling through the top of the cabinet: Side Cable Conduit, SCC, not equipped.

Figure 36. Space requirements of the BSC3i network element

When the equipment room has raised floor, a Side Cable Conduit (SCC) isconnected to each BSCC cabinet. The SCCs can be connected to either side of thecabinet.

Layout examples of a BSC3i site

The BSC3i network element consists of one equipment cabinet, the BSCC.Network elements are installed in rows as shown in the following figures,including the layout examples with a Side Cable Conduit (SCC).

BSC3i500

450

WORKING AREA

1000

1000

600

900




Figure 37. Left-to-right configuration, an example

Figure 38. Right-to-left configuration (raised floor) with Side Cable Conduit, anexample

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900 900 900 900 900

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Overview of the BSC3i installation site

6.2 Cable structures and estimated powerconsumption

For further information on the cable structures, see Installation Site Requirementsfor BSC3i.

Cables of peripheral devices

The connectors for the VDUs and LPTs used for temporary service operations areon the front panels of the CPU plug-in units. The cables connect to RJ45connectors.

The permanent VDU and LPT connections for monitoring the operations of theunits are made through the CPRJ45 connector panels in the BSCC cabinet.

PCM trunk distribution frame (DDF)

Distribution frames are not system-specific and are therefore not discussed inEngineering for BSC3i.

Cable trays

The DX 200 system construction does not comprise actual cable trays. The cablesupport construction arrangements for the external cables are decided upon by thecustomer individually.

Estimated power consumption

The estimated maximum power consumption value for a fully equipped S11.5BSC3i is 1700 W.




7 Alarm system for BSC3i

The task of the alarm system is to process the alarm signals collected from thenetwork element and find the basic fault or disturbance behind the alarmcondition. The alarm system tries to localise the unit in which a disturbance or afault has been generated, after which the appropriate automatic recoveryfunctions can be activated. The user is informed of failure conditions with alarmprintouts and EXAU controls. The alarm system stores all alarm events on a disk.Alarm history stored on the disk can later be examined by means of the userterminal.

With the user interface, it is possible to cancel or block alarms, output alarmhistory, and change alarm-specific parameters and EXAU controls. See FigureImplementation model of the alarm system .

Figure 39. Implementation model of the alarm system

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Alarm system for BSC3i

Alarm functions of the system include:

. collection of alarm data

. storing of alarm data

. output of alarms

. control of alarm printouts.

For a general introduction to Engineering for BSC3i, see Overview ofEngineering for BSC3i .

7.1 Collection of alarms

The alarm data can be divided into the following subgroups:

. hardware alarms

. fault observations of the program blocks

. fault observations of the preprocessors.

All the fault observations and alarms of the exchange are saved in the log file ofthe alarm system.

Hardware alarms

Supervision logic has been integrated into some types of hardware. Thesupervision logic can inform the alarm system about malfunctions in thehardware. The following are devices of this type:

. power sources

. plug-in units which need basic timing signals for their timing.

In addition, the following are supervised by the hardware:

. fuses

. premises.

In the BSC systems, the hardware alarms of the cartridges are wired to the CLOCcartridge, from which they are relayed to the plug-in unit HWAT in the OMUcartridge. The alarms are transmitted to normal processing by the alarm systemfrom the HWAT by the software.




Fault observations of the software

The observations can be passing disturbances detected in the system, ON/OFF-type alarms, or updates of the error ratio counters. The error ratio counters areused to collect information about statistical errors.

Fault observations of the preprocessors

Each preprocessor supervises its own function and environment. The alarmsystem provides a service to the preprocessors by means of which they can sendtheir alarm data directly to the alarm system. The fault observations ofpreprocessors (AS7, for example) are transmitted to the alarm system through anapplication program block.

7.2 Alarms from the TCSM2

Alarms are transferred over the operation and maintenance link to the BSC.Current alarms can, however, be viewed on a local MMI terminal. For immediateunderstanding at a local MMI terminal, the TRCO software assigns a text stringto the alarms.

When the BSC receives alarms indicating that traffic channels, trunks or otherportions of the traffic capacity are lost, it immediately blocks the respectiveelements in its own system. The TCSM2 itself is not aware of the blockingmeasures taken by the BSC.

7.3 BTS alarm handling in the BSC

BTS alarm handling in the BSC collects various fault indications of the system,processes them and informs the user of the faults in actual alarm printouts.Moreover, the alarm handling system makes decisions on the basis of alarmindications and activates the radio network recovery when needed, so that theautomatic recovery actions will be started.

The received BTS alarms are stored in a disk file. The alarm history and thealarms currently on can be displayed with an MML command. The BTS alarmhandling MML also allows the user to change certain alarm parameters and tocancel alarms manually.

The alarm handling system receives alarm indications from the following sourcesin the radio network:



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. alarms from the BTS equipment

. alarms from the BTS concerning the BTS software

. external alarms from the BTS site

. alarms concerning PCM lines in the radio network

. alarms from LAPD links on the A-bis interface

. alarms from A-bis interface equipment.

7.4 BSS transmission equipment handling

When the equipment is located at a BTS site, the management commandsbetween BSC and BTS are sent via the LAPD based operation and maintenancelink. The OMU of the BTS forwards the commands to the managed equipmentvia the local Q1 bus. Possible equipment types at the BTS site are:

. Base Station Interface Equipment (BIE)

. Transmission Unit (TRU)

. Digital Microwave Radio Link (DMR).

Furthermore, four other pieces of transmission equipment (TE), for exampleOptical line equipment, can be connected to the local Q1 bus at the BTS site.

7.5 Nokia NetAct network management system

Nokia NetAct is a network and service management system, which providescentralised management functions for different network technologies and networkdomains. Nokia NetAct can manage both the network and the services in acentralised manner, meaning that the operator can view the network elementstatus, service quality indicators and traffic from a single screen. A network-wideview is always available.

A Unified Mediation and Adaptation layer (UMA) is the interface towards thedifferent network subsystems, such as the BSS. The UMA is responsible forcollecting data from the BSS, such as alarms, events, and measurements. Aunified adaptation to network elements and element managers makes it possibleto handle alarms and performance indicators in the same way regardless oftechnology or origin.




Nokia NetAct consists of functionality areas (for example, Monitor, Reporter, andPlanner), which provide management capabilities grouped together according tothe most relevant operator processes. For the BSS, there is an extensive set ofmanagement functionalities available, for example the following:

. monitoring

. reporting

. planning

. configuring and optimising

. system management

. service quality management.

The hardware solution of Nokia NetAct is built of one or more server clusters andoperator seats. Regional clusters manage a specific region, while global clustersare intended for centralised network management tasks. When distributing theoperations between regional and national management centres, the regional serverclusters and third party management systems are connected to the global clustervia a Data Communication Network (DCN). The hardware includes thefollowing:

. High-availability servers (HP-UX)

. Application servers (Windows and HP-UX)

. Operator seats

. Storage Area Network (SAN) with disk array

. DCN backbone.

7.6 EXAU

Nokia network elements can be equipped with an alarm unit to make the alarmmonitoring more efficient. The External Alarm Unit (EXAU) is a small devicecontrolled by the HWAT-A plug-in unit located in the network element. TheEXAU indicates alarms from the network element with indicator lights and abuzzer.

The EXAU panel consists of a base assembly and a cover assembly with acomponent board attached to it with three attachment pins. The component boardaccommodates also the power supply and alarm connectors. Functionally, theEXAU panel consists of the following blocks:



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. component board (PCB) connected to the cover

. base frame for mounting on the wall

. alarm inputs, D25 connector on the component board

. six indicator LEDs connected to the component board

. buzzer mounted on the component board

. Test, Buzzer Reset and Silent Mode buttons connected to the componentboard

. power supply (-48 V).

Figure 40. Block diagram of the EXAU

Alarms that activate the buzzer can be selected with DIP switch SW1. Thebuzzer, like the indicator LEDs, are connected to six alarm inputs. The buzzer canbe switched off by the silent mode button. The test cutton is used to test theoperation of the indicator LEDs and the buzzer.

Power is supplied via a protective switch SW2 and fuse F1. When the coverassembly is opened, the power supply to the EXAU unit is disconnected.

LEDS BUZZER

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8 Synchronisation for BSC3iSynchronisation principles on the system level

The primary synchronisation method in the DX 200 network is based on the so-called master-slave principle. In this method, the network elements in a givennetwork are hierarchically organised in such a way that a network element on ahigher level in the hierarchy controls the synchronisation of network element(s)one step below it. A DX 200 network element which is synchronised to higherlevel equipment can, in turn, function as a synchronisation source for lower levelequipment. The synchronisation signals are transmitted through the PCM lines.

If the connection to the master equipment is broken, the DX 200 equipment cancontinue operation by switching into plesiochronous mode , that is by generatingtheir own basic frequency without an external synchronisation reference. Whenthe connection to the master equipment is restored, the equipment will re-synchronise to the synchronisation signal coming from the higher-level exchangeor network element.

Architecture of the DX 200 network synchronisation

The DX 200 cellular network synchronisation plan is usually designed in such away that one of the exchanges in a PSTN or an ISDN network functions as themaster exchange and supplies the synchronisation reference to the MSCs in thecellular network. The synchronisation signal is also fed to each MSC from one ormore other MSCs of the same network, to ensure the availability of thesynchronisation reference in case the connection to the PSTN/ISDN is disrupted.

The MSCs, in turn, supply the synchronisation reference to the HLRs of thenetwork, as well as to the BSCs via the TCSMs. To ensure redundancy, each HLRof the network receives the synchronisation reference from multiple MSCs, andeach BSC from multiple TCSMs. The redundancy of the synchronisationreference to the TCSMs and BSCs has been arranged by supplying each referencesignal through a separate PCM. The architecture of the network synchronisationsystem is depicted in Figure Synchronisation of the BSC .



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Synchronisation for BSC3i

Figure 41. Synchronisation of the BSC

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In the configuration depicted in the picture, there are 16 separate transcoders inthe TCSM rack, each of which receives four synchronisation reference signalsfrom the MSC1.

Internal synchronisation of the BSC3i

Each DX 200 network element has an internal clock generator which receives thereference timing from external synchronisation sources (normally external PCMcircuits) and generates pairs of timing signals which are distributed to all otherplug-in units in the network element. In the BSC, each pair normally uses thefrequencies 8.192 MHz / 8 kHz.

The basic configuration of the BSC3i is one rack. In the CLOCB cartridge of thecabinet, two Clock and Tone Generator (CL3TG) plug-in units are positioned

Performance characteristics of the CL3TG are the following:

Stability (at temp. +5 °C / 41°F to40°C / 104°F)

< 3×10-7

Stability (due to ageing) < 5×10-9 /day

Accuracy after loss of externalsynchronisation

- initially: +/- 1×10-9

- after one day: +/- 2×10-8

Number of synchronisation inputs for CL3TG:

. four for PCM lines

. two external inputs (120 ohm balanced / 75 ohm unbalanced) / one externalinput (120 ohm balanced / 75 ohm unbalanced) when ET4 is used

Line coding/decoding standards supported for PCM signals:

ETSI version: HDB3

ANSI version: AMI and B8ZS

Redundancy 2n

Note



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Synchronisation for BSC3i

The PCM cables carrying the synchronisation signal connect to ET4 / ET2 plug-in units powered by different power supplies in order to ensure redundancy of thepower supply.

For a general introduction to Engineering for BSC3i, see Overview ofEngineering for BSC3i .




9 Management network topology for BSC3i

Nokia NetAct offers standard interfaces towards the network elements, thehigher-level network management system and the administrative systems . SeeFigure Nokia NetAct system interfaces (BSS includes BSC, TCSM2,transmission equipment and BTS) .

Figure 42. Nokia NetAct system interfaces (BSS includes BSC, TCSM2,transmission equipment and BTS)

Nokia NetAct supports the following physical interfaces:

. X.25 via packet switched network (analog connection)

. X.25 via time slots reserved from a semipermanently connected PCM link(digital connection)

. LAN.

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Management network topology for BSC3i

The operation and maintenance interfaces between the Nokia NetAct and thenetwork elements follow the principles described in the GSM Recommendation12.01. The protocol stack is implemented in the Nokia NetAct for communicationbetween the Nokia NetAct and the network elements.

Remote terminal sessions can be established from the Nokia NetAct to the DX200 network elements (BSC, TCSM2 MSC). The PAD (Packet Assembly/Disassembly, X.29) protocol over the X.25 connections is used for the remoteterminal.

Interface towards the Base Station Subsystem

The interface between the Nokia NetAct and the Base Station Subsystem (theBSS) uses the X.25 or LAN connection. The management protocol stack in theBSS follows the principles described in the GSM Recommendations 12.01 and08.09.

The network management applications in the BSS and in the Nokia NetAct usethe File Transfer Access Method (FTAM) for file transfer. The CommonManagement Information Protocol (CMIP) is used for other networkmanagement purposes. Some applications use a remote MMI, that is, the networkelement's local commands are given from a remote site.

The operation and maintenance network is connected to the time slots of the PCMcircuit by means of the signalling interface adapter (AS7). To ensure redundancy,a spare time slot can also be allocated for the operation and maintenanceconnections, which is taken into use when the connection through the main timeslot is disrupted.

Interface to the switching subsystem

The interface between the Nokia NetAct and the switching subsystem (MSC/VLR and HLR/AC/EIR) uses the X.25 or LAN connection and the PAD (PacketAssembly/Disassembly, X.29). The switching subsystem is controlled from theNetAct with a remote MML via the PAD. The switching elements send reportsand other output to the NetAct via a Nokia proprietary protocol on top of theX.25. These outputs can be forwarded to output devices or applications in theNetAct.

The management protocol stack is also implemented in the switching subsystemelements. The FTAM can be used for transferring files between the NetAct andthe switching subsystem elements.

For a general introduction, see Overview of Engineering for BSC3i .




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