02-BSC Product Description

EVOLIUM™ G2 Base Station Controller Product Description

Alcatel File Reference Date Edition Page02-BSC Product Description v 7 3DC 21016 0003 TQZZA 04/10/2002 06 1

All rights reserved. Passing on and copying of this document, use and communication of its contents not permitted without written authorization.

EVOLIUM™ G2 Base Station Controller

Product Description




SCOPE

The EVOLIUM™ Base Station Controller is an integral part of the EVOLIUM™ BSS. This documentprovides a detailed overview of the technical realization. It describes the functional behavior of thevarious components and gives a complete overview of the product characteristics.

This document contains a detailed description of the complete product range. Its content does notreflect system capabilities for a particular delivery date or software release!




CONTENTS

1. Introduction ...................................................................................................................................... 5

2. General Information about THE EVOLIUM™ BASE STATION CONTROLLER ............................ 5

3. Functional Description ..................................................................................................................... 6

3.1The A-bis Terminal Sub-Unit (A-bis TSU) .................................................................................. 7

3.1.1 The Base station Interface Unit type A (BIUA)................................................................. 7

3.1.2 The Terminal Control Unit type C (TCUC) ....................................................................... 8

3.1.3 A-bis TSU capacity........................................................................................................... 8

3.2The A-ter Terminal Sub-Unit (A-ter TSU)................................................................................... 9

3.2.1 The Digital Trunk Controller type C (DTCC) .................................................................... 9

3.2.2 The Alcatel Submultiplexer type B (ASMB) ..................................................................... 9

3.2.3 A-ter TSU capacity ........................................................................................................... 9

3.3The common-functions TSU....................................................................................................... 9

3.3.1 The OSI Common-Processing Resource type C (OSI-CPRC)...................................... 10

3.3.2 The System Common-Processing Resource type C (System-CPRC) .......................... 10

3.3.3 The Broadcast Common-Processing Resource type C (BC-CPRC)............................. 10

3.4The switch matrix and other functions...................................................................................... 11

3.4.1 The switch matrix ........................................................................................................... 11

3.4.2 The BSC Clock type A (BCLA)....................................................................................... 11

3.4.3 The BSC DC/DC converters .......................................................................................... 11

3.4.4 The Transmission and Submultiplexer Controller A (TSCA) ......................................... 12

3.5Interfaces, cables and connectors ........................................................................................... 12

3.5.1 The submultiplexed A-bis and A-ter interfaces .............................................................. 12

3.5.2 External alarm interface ................................................................................................. 12

3.5.3 Interface to the OMC-R .................................................................................................. 13

3.5.4 Man-Machine Interface (MMI) on submultiplexing modules .......................................... 13

4. Configuration and capacity aspects .............................................................................................. 14

5. Technical Description .................................................................................................................... 16

5.1Cabinet layout, size and floor space requirement .................................................................... 16

5.1.1 Layout of the basic cabinet and subracks...................................................................... 16

5.1.2 Technical data and layout of the six configurations ....................................................... 20

5.1.3 Size and floor space requirements ................................................................................ 27

5.2Power supply system................................................................................................................ 29




5.3Environmental and reliability aspects....................................................................................... 29

5.3.1 Environmental conditions............................................................................................... 29

5.3.2 EMC ............................................................................................................................... 30

5.3.3 Safety ............................................................................................................................. 30

5.3.4 Reliability and availability ............................................................................................... 31




1. INTRODUCTION

The EVOLIUM™ G2 Base Station Controller (BSC) is a flexible switching entity that supervises andcontrols the EVOLIUM™ Base Stations. It is an important element in the PLMN permitting trafficconcentration and hence transmission cost reduction. Its highly distributed processing architecturehas sufficient power to handle the most demanding mobile network configurations.

2. GENERAL INFORMATION ABOUT THE EVOLIUM™ BASE STATIONCONTROLLER

The EVOLIUM™ G2 Base Station Controller supports the GSM 850, GSM 900, GSM 1800 andGSM 1900 standards, as well as the multi-band combinations allowed by those standards: GSM 850+ GSM 1800, GSM 850 + GSM 1900 and GSM 900 + GSM 1800. Since its first launch intocommercial service in 1997 it has amply demonstrated its key characteristics of outstanding stabilityand availability in conjunction with a high call success rate.

In common with all other similar products the BSC offers a proprietary A-bis interface towards theBase Transceiver Stations but the A interface towards the MSC conforms to ETSI standardspermitting operation in a multi-vendor environment.

The EVOLIUM™ G2 Base Station Controller has been designed in a modular way, permittingflexible extensions. Purchasing and deploying the configuration, best suited to the network topologycan therefore optimize investment.

The processing capacity is distributed throughout the BSC modules. In conjunction with the conceptof distributed software it is possible to provide high availability and sufficient resources for futuremicrocellular algorithms and high-traffic applications.

The location of the BSC can be chosen to optimize network cost and topology. Remote location,using the BSC as a concentrator, can save the installation and operational costs of transmissionlines. If the distances MSC-BSC-BTS are short and the BSC is co-located with the MSC, saving onsites and overall operational aspects are other advantages.

With its modular design, its flexibility in operation and the provisions for future network performancerequirements, the EVOLIUM™ G2 Base Station Controller is well suited to all types of GSM mobilenetworks. For the introduction of GPRS (General Packet Radio Service) features only a limitedsoftware upgrade in the EVOLIUM™ G2 BSC is necessary.

This second generation of the EVOLIUM™ Base Station Controller provides the followingenhancements relative to its predecessor: Higher connectivity, more processing and storagecapacity, more flexible and integrated submultiplexing and reduced volume.




3. FUNCTIONAL DESCRIPTION

The design of the EVOLIUM™ G2 Base Station Controller is based upon the principle of distributedprocessing. Functions are distributed over several modules, becoming thereby less prone tofailures. The basic functions are:

- Radio resource management for circuit-switched (CS) and/or GPRS services,- Radio network management,- A-bis, A-ter and A-interface management,- Paging- Processing of non-transparent layer-3 messages,- Operation and maintenance of the BSS,- Switching and submultiplexing of speech, data and signalling information.

The BSC is connected to other network elements via the following interfaces:

- The A-bis interface towards the BTS,- The A-ter interface directly towards the transcoder or via the MFS (Multi BSS Fast packet

Server),- The BSC - OMC-R interface.

BTSAbisAbis Ater A

Gb

OMC-R

Ater

IMT

SGSN

BSC TC

MFS(PCU) MSC

Figure 1: BSC context in the PLMN

All external interfaces are connected via processor-controlled interface boards, the lattercommunicating with each other via a self-routing circuit and message switch.

The switch logic interconnects speech/data paths between the A-bis and the A-ter interfaces. It is anend-marked, self-routing switch controlled by in-stream commands. It is also used for message(packet) intercommunication between processors, described as Control Elements (CE), connectedto the switch.




The figure below shows the general layout of the EVOLIUM™ G2 Base Station Controller.

TCUC

TCUC

TCUC

TCUC

TCUC

TCUC

TCUC

TCUC

ASAS

DTCC

DTCC

DTCC

DTCC

DTCC

DTCC

DTCC

DTCC

Ater TSU

Common-functions TSUCommon-functions TSU

ASMBASMB

ASMBASMB

Broadcast bus

AS

AS

6 xG.703AbisI/F

2 xG.703AtermuxedI/F

CPRC CPRC CPRC CPRC CPRC CPRC CPRC CPRC

Abis TSU

Group switch8 planes2 stages

self-routing,non-blocking

TSLQmux bus

TSCATSCA

BIUABIUA

Figure 2: Overview of EVOLIUM™ G2 Base Station Controller components

Pairs of CEs that communicate through predefined paths perform the maintenance of the switch. Toavoid special cabling, this requires CEs to be installed in groups of thirty two using four pairs ofAccess Switches, all of which are connected to the same first stage group switch element in eachplane. Such a group of thirty-two CEs together with their Access Switches is known as a TU(Terminal Unit), a quarter of this, eight CEs with their Access Switch pair is known as a TSU(Terminal Sub-Unit). In the figure above, three different TSU types can be distinguished: One for theA-bis interface, one for the A-ter interface and one for common functions. These three TSUs aredescribed in the following sections.

3.1 The A-bis Terminal Sub-Unit (A-bis TSU)

The A-bis TSU consists of one BIUA (Base station Interface Unit type A), eight TCUCs (TerminalControl Unit type C) and two Access Switches.

3.1.1 The Base station Interface Unit type A (BIUA)

The BIUA is a submultiplexing and cross connect module. It provides six G.703 A-bis interfaceswhich permit the connection of six A-bis PCM trunks. This corresponds to a maximum of six trunksin star or multidrop chain configuration or up to a maximum of three multidrop loop configurations.(Note that there is an overall limit on the capacity of the A-bis TSU that is less than the maximumcapacity of all six PCM trunks.)




The cross-connect function can route any TRX and signalling channel from any of the six A-bisinterfaces to any of the eight TCUCs. This permits reconfiguration within the capacity of the TSU. Noon-site visit is necessary for extensions of TRXs or BTSs as long as the capacity of the TSU is notexceeded and no additional A-bis-interfaces need to be connected to the BSC.

The reconfiguration can be managed from the OMC-R.

3.1.2 The Terminal Control Unit type C (TCUC)

A TCUC can handle a maximum of four full-rate TRXs and four cells. It contains six HDLCcontrollers and hence can support up to six LAPD connections with a bit rate of either 16 kbit/s or64 kbit/s. These controllers terminate the signalling links for the TRX (RSL) and the BTS (OML).When individual signalling links are used, this results in a maximum of four FR TRXs / two BTSs orthree FR TRXs / three BTSs per TCUC but it is also possible to support four single TRX BTS eachusing a combined RSL/OML.

In addition, the TCUC can handle a maximum of 32 traffic channels in both directions. These can bedistributed either between four full-rate TRXs or two dual-rate TRXs. Each TCUC can operate eitherin full-rate or in dual-rate mode.

The TCUC performs the necessary processing of data (handover measurements, performancecounters, etc.) for each of the TRXs and BTSs that are assigned to it. It provides the connection tothe switch for the speech and data channels. Communication with other CEs is performed viaconnectionless signalling over the switch.

The TCUC is a processor module, equipped with 8 Mbytes of DRAM.

3.1.3 A-bis TSU capacity

The capacity of one A-bis TSU permits the assignment of 32 full-rate TRXs to a maximum of 32 cellswithin the TSU. Reconfiguration, extension and reduction are possible within these limits. No on-sitevisit is necessary, if the A-bis trunk connections are equipped as required by the network topology.

The dual-rate capacity is 16 TRXs assigned to a maximum of 16 cells.

A maximum of six interface trunks can be connected in star or multidrop chain configuration. Forloop configuration, the maximum is three loops.




3.2 The A-ter Terminal Sub-Unit (A-ter TSU)

The A-ter TSU consists of two ASMBs, eight DTCCs and two access switches.

3.2.1 The Digital Trunk Controller type C (DTCC)

The DTCC routes traffic channels from the switch towards the A-ter interface. It also performsSignalling System No. 7 (SS7) and resource management tasks. All DTCCs can carry 31 trafficchannels. As defined in ITU-T recommendation G.704, one PCM channel, time slot 0, is reserved forsynchronization. In the standard configuration timeslot 16 is reserved for SS7 and timeslot 15 forsubmultiplexer maintenance, but these may be specially configured to use other timeslots. On someA-ter interfaces additional timeslot are used for other maintenance purposes.

For each SS7 link, a minimum of three DTCCs is needed to provide the maximum capacity of 256SCCP connections. In most configurations the ratio of SS7 DTCs to links is greater than 3:1 andmore than 256 SCCP connections per link are possible.

Two pairs of DTCCs per cabinet are assigned for the radio resource management of the cells orTRXs connected to this cabinet. For this application, both pairs operate in active/standby mode.

Clock reference extraction from the A interface is also performed by the DTCC. This signal is routedto the BCLA, where the BSC internal clock is generated.

The DTCC is a processor module, equipped with 8 Mbytes of DRAM.

3.2.2 The Alcatel Submultiplexer type B (ASMB)

The ASMB module combines the traffic channels of up to four DTCCs onto one A-ter PCM trunk.This results in a maximum of 116 TCHs per trunk.

3.2.3 A-ter TSU capacity

Up to 232 TCHs can be supported by the A-ter TSU.

3.3 The common-functions TSU

Apart from the switching and processing functions which operate in a distributed mode, theEVOLIUM™ G2 Base Station Controller also contains elements that provide functions for thecomplete BSC. Such functions are O&M and the X.25 connections towards the OMC-R.

The common-functions TSU contains two CPRCs for O&M (OSI-CPRCs), two CPRCs for systemfunctions (System-CPRCs) and two CPRCs for the control of the broadcast bus (BC-CPRCs). Inaddition, two slots are available for two auxiliary CPRCs should these be required in the future. Aswith the other TSUs, in addition to the CPRCs, there are two access switches.




Several of the CPRC software applications operate in active/standby mode. In case of a failure ofthe active CPRC, the application on the standby CPRC is able to switch directly into operationwithout loss or interruption of service.

The basic CPRC is a processor module, equipped with 8 Mbytes of DRAM.

3.3.1 The OSI Common-Processing Resource type C (OSI-CPRC)

This pair of processors is used for O&M purposes. Retrieval of performance measurements,initiating of fault and configuration management actions as well as the OSI stack and the X.25 linktowards the OMC-R are handled by these modules. For storing data, a 32-Mbyte RAM disk isprovided.

3.3.2 The System Common-Processing Resource type C (System-CPRC)

This pair of processors is used for system-related tasks for the complete BSC. For example thecomplete software is stored on the Solid-State Disk (SSD) contained on this module. The SSD has128 Mbytes capacity. The System-CPRCs also provides a connection to the Local MaintenanceTerminal (LMT).

3.3.3 The Broadcast Common-Processing Resource type C (BC-CPRC)

With the EVOLIUM™ G2 Base Station Controller, a new type of communication medium betweenthe processing modules has been introduced. The so-called broadcast bus connects all theprocessing modules of the BSC.

The bus is driven by two dedicated CPRCs that are the only modules with write access. Othermodules that want to transmit on the bus first have to send the data to the broadcast CPRC via theswitch messaging system.

Despite the much increased BSC capacity, the performance characteristics are in fact much betterthan its predecessor. Especially for paging in a microcellular environment, a rapid distribution of thepaging commands from the SS7 terminating DTCC towards the appropriate TCUC is important. Ifthe same sequential distribution method as was used in the previous product had been retained,with a large number of cells, the execution time on the DTCC would have been critical. The DTCCtherefore sends the paging command with the necessary instructions only to the broadcast CPRCthat then puts this command onto the broadcast bus. Thus in a single operation, all affected TCUCsget the paging message.




3.4 The switch matrix and other functions

In addition to the TSUs, the EVOLIUM™ G2 Base Station Controller contains other componentssuch as the digital switching network, DC/DC converters and the clock modules.

3.4.1 The switch matrix

The BSC switch matrix is a three stage digital switching network. The first stages are the AccessSwitches in each TSU. Two further stages form the Group Switch. All stages use the same 16 portswitching element.

3.4.1.1 The access switch

The access switch is a single stage of switching elements through which the control elements:TCUC, DTCC and CPRC gain access to the group switch. For security reasons, there are alwaystwo access switches per TSU.

3.4.1.2 The group switch

In order to provide such a high switching capacity, a two-stage group switch is used. The groupswitch is folded at the second stage. It consists of eight planes. A maximum sized two stage GroupSwitch would have 16 stage-1 and eight stage-2 switching elements. In the G2 BSC, only six stage-1 and eight stage-2 switches are required.

3.4.2 The BSC Clock type A (BCLA)

There are two variants of the BCLA, the system BCLA and the rack BCLA.

A redundant pair of system BCLA modules in the first cabinet of each BSC each accept timingreferences from up to three A ter mux interfaces (six in all) and hence from the A interface asspecified in GSM 08.04. They generate a reference clock for the BSC synchronized to one of thereference sources. The synchronization function is compliant with G.823 (March 93) and the moreonerous ETSI requirements TBR12 and TBR13. The outputs from the system BCLAs are distributedto pairs of rack BCLAs, one pair in each rack. These regenerate the clock signals, and provide non-disruptive switching between the two sources if the active one fails. The rack BCLAs distributeclocks throughout their cabinet.

3.4.3 The BSC DC/DC converters

The internal BSC DC/DC converters convert the nominal 48/60 V exchange battery supply to thelower voltages required by the BSC circuits. They are interconnected to provide N+1 redundancy.




3.4.4 The Transmission and Submultiplexer Controller A (TSCA)

The TSCA supervises all submultiplexing entities in the BSS. The TSCA acts as a slave of theCPRC and periodically polls both local and remote submultiplexing entities to collect alarms and todistribute settings.

3.5 Interfaces, cables and connectors

The BSC is available with either 75-Ω coaxial or 120-Ω balanced A-bis and A-ter interfaces.

The BSC has the following external connections:

- Submultiplexed A-bis interface,- Submultiplexed A-ter interface,- External alarm signals,- OMC-R interface (on CPRC),- Man-Machine Interface (MMI) (RS-232 and V.24/V.28 on CPRC, TSCA, BIUA and ASMB).

All ITU-T recommendations referred to are Blue Book as amended 03/93 where appropriate.

3.5.1 The submultiplexed A-bis and A-ter interfaces

The physical and electrical characteristics are according to G.703/6; the frame structure conforms toG.704/5.1.1.

3.5.2 External alarm interface

There are ten external-alarm-input interfaces that can be used to supervise external equipment thathas a normally closed loop break contact such as power supplies, air conditioning etc. Theseinterfaces are quite robust and can tolerate being connected to exchange battery voltage withoutdamage but are referenced to the BSC electronic ground and do not provide galvanic isolation. Ifgalvanic isolation is required then an external isolation box is available.




3.5.3 Interface to the OMC-R

The EVOLIUM™ G2 Base Station Controller provides two types of interfaces via a PSDN (PacketSwitched Data Network): a V.24/V.28 interface for low-speed connections up to 9600 bit/s and anX.21 interface for high-speed connections up to 64 kbit/s. Direct connections to the OMC-R wouldnormally use the X.21 interface.

To save space, both interfaces are presented on one 25-pin sub-miniature D connector. Foroperation in high-speed mode, an adapter cable between 25 pin and 15-pin sub-miniature Dconnector is available.

The interface to the OMC-R can also be routed over the A interface. In many cases this can be morecost effective than using a PSPDN. .

3.5.4 Man-Machine Interface (MMI) on submultiplexing modules

This interface is provided to connect local maintenance terminals to the modules CPRC, TSCA,BIUA, and ASMB. The MMI conforms to the V.24/V.28 (RS-232) standard.




4. CONFIGURATION AND CAPACITY ASPECTS

The EVOLIUM™ G2 Base Station Controller is available in six configurations. The smallest one ismostly intended for pilot systems and very small networks. The other ones are optimized for a largevariety of networks.

The capacity and the performance of the EVOLIUM™ G2 BSC are dependent on the BSS softwarerelease with which this equipment operates. Indeed, significant capacity and performanceimprovements will be effective with future software releases whereas the EVOLIUM™ G2 BSChardware itself will remain unchanged.

The table below gives some key figures about the configurations. One must be aware that thefigures are maxima. In a given network context, none of these maxima must be exceeded. It followsthat, considering all the factors together, one or more maxima may not be reached in a givennetwork configuration.

ConfigurationTraffic

capacity inErlang1)

No. ofTRXs

(FR/DR)

No. ofBTSs

(FR/DR)

No. ofcabinets

No. of A-bis/A-ter

TSUs

1 160 32/16 23/16 1 1/2

2 650 128/64 95/64 1 4/3

3 1100 192/96 142/96 2 6/5

4 1300 288/144 214/144 2 9/6

5 1600 352/176 255/176 3 11/8

6 1900 448/224 255/224 3 14/9

Table 1: Overview of physical maximum EVOLIUM™ G2 Base Station Controllerconfigurations

Configurations 2, 4, and 6 are full-rack configurations. The steps between these are 160 FR TRXs.The configurations 1, 3, and 5 incorporate half-racks and contain 96 FR TRXs less than the nexthigher even-numbered layout.

1) For more detailed information on the BSC capacity and dimensioning rules, please refer to the documentation

describing the BSC G2 dimensioning in the different software releases.




Configurations 4, 5, and 6 are available from Release B5 onwards.

Configuration 6 is equipped to support more than 400 TRXs; the software to exploit this connectivitywill be available from release B7 onwards.




5. TECHNICAL DESCRIPTION

The configurations described above are housed in one to three cabinets. This chapter provides adescription of the cabinet layout, of the external interfaces, and other basic characteristics of theEVOLIUM™ G2 Base Station Controller hardware.

5.1 Cabinet layout, size and floor space requirement

The cabinet layout is described down to the module level. A floor plan is given for the variousstandard configurations.

5.1.1 Layout of the basic cabinet and subracks

The layout of the first cabinet is given in the figure below.

Abis TSU

Abis TSUGSGS

GSCommon-functionsTSU

TSCA

ClockStage 1Stage 1

Abis TSU

Ater TSU

Ater TSU Ater TSU

Abis TSU

Stage 2

Group SwitchStage 2

GSStage 2

Air baffle

GSStage 2

Figure 3: Layout of the basic EVOLIUM™ G2 Base Station Controller cabinet

Based on the layout above, the different back panels will be described. The second and third BSCcabinets are then built upon these basic Back-Panel Assemblies (BPAs).




5.1.1.1 BPA group switch stages 1 and 2

The BPA for group switch stages 1 or 2 contains the switching elements (SWCHs) and the DC/DCconverter as shown in the following figure:

01 03 05 07 09 11 13 15 17 19

SSWWCCHH

DC/DCSSWWCCHH

SSWWCCHH

SSWWCCHH

SSWWCCHH

SSWWCCHH

SSWWCCHH

SSWWCCHH

00 7711 66553322 44

Figure 4: Group switch stages 1 and 2 BPA

5.1.1.2 BPA containing A-ter TSU

This BPA contains the DTCCs, the ASMBs, the access switches, the DC/DC converter and twoSWCHs that form a quarter of a stage-1 group switch.

01 03 05 07 09 11 13 15 17 19 21 23 25 27 29 31

DTCC

ASMB

ASMB

DTCC

DTCC

DTCC

DTCC

DTCC

DTCC

DC/DC SSWWCCHH

SSWWCCHH

SSWWCCHH

SSWWCCHH

DTCC

GG GG AA AASS SS SS SS

1 4 5 82 3 6 7

Figure 5: BPA for A-ter TSU




5.1.1.3 BPA containing A-bis TSU

There are two types of A-bis TSU one contains the TCUCs, the access switches, the BIUAs and twoDC/DC converters. The other type is similar to the A-ter BPA and contains two GS1 switches and asingle DC/DC converter.

01 03 05 07 09 11 13 15 17 19 21 23 25 27 29 31

DC/DC

SSWWCCHH

SSWWCCHH

AASS

AASS

TCUC

BIUA

1 2 3 4 5 6 7 8

TCUC

TCUC

TCUC

TCUC

TCUC

TCUC

TCUC

DC/DC

Figure 6: BPA for A-bis TSU (lower subracks)

01 03 05 07 09 11 13 15 17 19 21 23 25 27 29 31

DC/DC SSWWCCHH

SSWWCCHH

SSWWCCHH

SSWWCCHH

GG GG AA AASS SS SS SS

TCUC1 2 3 4 5 6 7 8

TCUC

TCUC

TCUC

TCUC

TCUC

TCUC

TCUC

BIUA

Figure 7: BPA for A-bis TSU (upper subrack, together with A-ter TSU)




5.1.1.4 BPA containing common-functions TSU

In the first rack, the common-functions TSU contains the various types of CPRCs, the accessswitches and a DC/DC converter. In the second and third racks, the CPRCs are replaced by TCUCsto provide additional A-bis TSU.

01 03 05 07 09 11 13 15 17 19 21 23 25 27 29 31

DC/DCCPRC

SSWWCCHH

SSWWCCHH

AASS

AASS

CPRC

CPRC

CPRC

CPRC

CPRC

SYS

SYS

OSI

OSI

BC

BC

SPARE

SPARE

1 2 3 4 5 6 7 8

Figure 8: BPA for the common-functions TSU

5.1.1.5 BPA containing the BSC clock A (BCLA) modules

Four clock modules plus one DC/DC converter are mounted on one BPA. In the second and thirdBSC cabinets, the BCLA-SYS is not equipped, since it is not needed.

01 03 05 07 09 11

DC/DC BBCCLLAA

BCLA

BCLA

BBCCLLAA

SSYY

RRAACCKK

S

S

SSY

RACK

MM S MM S

M Master; S Slave

Figure 9: BPA for clock modules




5.1.1.6 BPA for Transmission and Submultiplexer Controller A (TSCA)

The BPA contains the TSCA and a DC/DC converter.

01 03 05 07 09 11

DC/DC TTSSCCAA

Figure 10: BPA for TSCA

5.1.2 Technical data and layout of the six configurations

Described are the physical maximum configurations.

For more detailed information on the BSC capacity and dimensioning rules, please refer to thedocumentation describing the BSC G2 dimensioning in the different software releases.




5.1.2.1 Configuration 1: 32-TRX BSC

Maximum number of BTS (FR/DR) 23/16Maximum number of TRXs (FR/DR) 32/16Maximum number of LAPD links 482

Traffic capacity 160 ErlangsMaximum number of A-bis interfaces (chain/loop) 6/3Maximum number of A-ter interfaces 4Maximum number of A interfaces 16Maximum number of CCITT SS7 links 4Number of cabinets 1Power supply -39 V DC to -72 V DCPower consumption 1000 WTransmission impedance 75 Ω or 120 ΩOverall dimensions (h x w x d) 2200 x 10003 x 520 mmWeight 250 kg

Table 2: Technical data of configuration 1: 32-TRX BSC

GS-2

Air baffleAir baffle

Ater Ater

BCLAGS-1 Abis

Common-functionsTSU

GS-2 GS-2

GS-2

Figure 11: Configuration-1 layout

2 One of these LAPD links is used internally for the connection to the TSCA

3 Including two 50 mm end covers








GS-2


Ater Ater

BCLAGS-1 Abis

Common-functionsTSU

GS-2 GS-2

GS-2

Ater Abis

Abis Abis


4 One of these LAPD links is used internally for the connection to the TSCA









GS-2


Ater Ater

BCLAGS-1 Abis

Common-functionsTSU

GS-2 GS-2

GS-2

Ater Abis

Abis Abis

GS-2


Ater Ater

BCLAGS-1 Abis

GS-2 GS-2

GS-2Abis


6 Two of these LAPD links are used internally for the connection to the TSCAs









GS-2


Ater Ater

BCLAGS-1 Abis

Common-functionsTSU

GS-2 GS-2

GS-2

Ater Abis

Abis Abis

GS-2


Ater Ater

BCLAGS-1 Abis

GS-2 GS-2

GS-2

Ater Abis

Abis Abis

Abis


8 Two of these LAPD links are used internally for the connection to the TSCAs









GS-2


Ater Ater

BCLAGS-1 Abis

Common-functionsTSU

GS-2 GS-2

GS-2

Ater Abis

Abis Abis

GS-2


Ater Ater

BCLAGS-1 Abis

GS-2 GS-2

GS-2

Ater Abis

Abis Abis


Ater Ater

BCLAGS-1 Abis

AbisAbis


10 Three of these LAPD links are used internally for the connection to the TSCAs









GS-2


Ater Ater

BCLAGS-1 Abis

Common-functionsTSU

GS-2 GS-2

GS-2

Ater Abis

Abis Abis

GS-2


Ater Ater

BCLAGS-1 Abis

GS-2 GS-2

GS-2

Ater Abis

Abis Abis


Ater Ater

BCLAGS-1 Abis

Ater Abis

Abis Abis

AbisAbis


12 Three of these LAPD links are used internally for the connection to the TSCAs





5.1.3 Size and floor space requirements

Depending on the configuration, the EVOLIUM™ G2 Base Station Controller can be housed in one,two or three cabinets. When two or three cabinets are used, they are bolted together to form a suite.The cabinets are designed for commercial buildings with a minimum ceiling height of 2.7 meters.Reinforcement of the floor is not necessary due to the lightweight design of the cabinets. Front andrear access to the cabinets must be provided.

One cabinet is 2200 mm high, 900 mm wide and 520 mm deep. The figure 17 shows the floor spacerequirement for the maximum configuration. The requirements for smaller configurations can bededuced from this.

The external cabling leaves at the top of the cabinet.

BSC1st cabinet

BSC2nd cabinet

BSC3rd cabinet

900 mm 900 mm 900 mm

1000

mm

1000

mm

520

mm

Two side covers,50 mm each

Figure 17: Floor plan for maximum BSC configuration

The following figure shows the installation and cabling of a site composed of one EVOLIUM™ G2BSC, one AC to DC Power Equipment Rack, one digital distribution frame (DDF), one modem, oneLocal Maintenance Terminal PC and a ground plate.




Cus

tom

erD

DF

RX

2200 mm

BSC

1St

atio

nB

SC1

EXT1

BSC

1EX

T2

2350 mm

Gro

und

Pla

te

AC

Box

380/

220V

MO

DEM

Wire

bra

id

TX

Equi

pmen

tD

DF

Bat R

etBa

t ABa

t B

Figure 18: Site installation example for an EVOLIUM™ G2 BSC




5.2 Power supply system

The BSC requires a nominal input voltage between -48 V DC and -60 V DC at each cabinet. Thestatic input range should not exceed -39 V DC to -72 V DC. If required, a complete BSC power plantcan be supplied, including standard backup batteries for emergency power and itself supplied fromcommercial power sources such as AC mains at the installation site.

Battery voltage is distributed within a cabinet to the DC/DC converters. These are located, asrequired, on the BPAs. The converters, powered from the BSC primary supply, convert the batteryvoltage to the DC voltages required by the semiconductor circuits on the modules.

The BSC has provisions for either 2-wire or 3-wire power and grounding installation. A powercabling option distinguishes between two rack variants and so this is an option that must bespecified at ordering time.

In the case of a total failure of the power supply external to the BSC, the contents of the solid statedisk on the System CPRC will be maintained by a lithium primary cell. The capacity of the cell issufficient to maintain the data for a total period of approximately 6000 hours or 8.5 months. In theunlikely event that the CPRC is left installed but unpowered for longer than this then the board mustbe returned to a repair center. During storage the lithium cell is disconnected and has a shelf life ofgreater than ten years.

5.3 Environmental and reliability aspects

5.3.1 Environmental conditions

The EVOLIUM™ G2 Base Station Controller is compliant with the following requirements:

- For storage ETS 300 019-1-1 class 1.1Conditions are valid for the non-packed equipment (rack).Icing and frosting are not allowed.

- For transport ETS 300 019-1-2 class 2.3

- For operation ETS 300 019-1-3 class 3.1Heat and solar radiation are not allowed.




Environmentalparameter Unit

OperationETS 300 019-1-3

class 3.1

TransportETS 300 019-1-2

class 2.3

Storage ETS 300 019-1-1

class 1.1Low air temperature °C +5 -40 -5High air temperature °C +40 +40 +45Low Relative humidity % 5 --- 5High relative humidity % 85 95 95Low absolute humidity g/m³ 1 --- 1High absolute humidity g/m³ 25 60 29Low air pressure kPa 70 70 70High air pressure kPa 106 --- 106Sand mg/m³ 30 In air: 0.1 30Dust (suspension) mg/m³ 0.2 --- 0.2Dust (sedimentation) mg/(m²h) 1.5 3 1.5Stationary vibration,sinusoidal:

- Peak-displacementamplitude

mm 0.3 3.5 1.5

- Peak-accelerationamplitude

m/s2 1 10 15 5

- Frequency range Hz 2 to 9 9 to 200 2 to 9 9 to200

200 to500

2 to 9 9 to 200

Non-stationary vibrationincluding shock:Shock-response spectrumtype L, peak acceleration m/s² 40 --- 40Shock-response spectrumtype II, peak acceleration m/s² --- 300 ---

Table 8: Environmental conditions for EVOLIUM™ G2 Base Station Controller

5.3.2 EMC

Compliant to ETS 300-386-1, edition October 1994, for equipment in telecommunication centers andhigh priority of service (table 3).

5.3.3 Safety

Compliant with IEC 950 (EN60950) for equipment located only in restricted access locations, andwhere access is restricted to service or trained personnel only.




The application of this standard is intended to prevent injury or damage due to the following risks:

- Electric shock,- Energy hazards,- Fire,- Mechanical and heat hazards,- Radiation hazards,- Chemical hazards.

5.3.4 Reliability and availability

The following are the BSC availability performance characteristics.

- Total system non-availability: 5.7 x 10-6 (1 hour/20 years),

- Non-availability of A-bis and A-ter interfaces:- Intrinsic 1.14 x 10-5 (six minutes/year) excluding logistic delay times- Operational 2.28 x 10-5 (twelve minutes/year) with logistic delay times of

four hours for urgent and twelve hours for non-urgent alarms

- Contribution of BSC to call-loss probability <2 x 10-5

- Probability that a call, once successfully established, will be lost due to failure in theBSC.

End of Document

02-BSC Product Description

Documents

Transcript of 02-BSC Product Description