ETU 155 Ethernet Unit for MINI-LINK HC Product Specification

Ericssonwide Internal 1 (23)

Prepared (also subject responsible if other) No.

ERI/S/W Corrado Cermelli 1/1301 HRY 901 10/1 Approved Checked Date Rev Reference

ERI/S Pierpaolo Cammelli 2005-05-31 A

ETU 155 Ethernet Unit for MINI-LINK HC

PRODUCT SPECIFICATION

Contents 1 Introduction ............................................................................................2

1.1 Scope .........................................................................................2 1.2 Application..................................................................................2 1.3 Definitions/Abbreviations............................................................2

2 Standards................................................................................................3 3 Description .............................................................................................7

3.1 Use cases ..................................................................................8 4 Environmental Conditions ....................................................................9 5 EMC .........................................................................................................9 6 Safety ......................................................................................................9 7 Main Characteristics ............................................................................10 8 Functional Blocks and Features.........................................................10

8.1 SDH/SONET Mapper ...............................................................11 8.2 Ethernet Mapper ......................................................................11 8.3 PDH Mapper ............................................................................12 8.4 Interfaces Specification ............................................................12

9 Synchronisation...................................................................................13 10 Local Alarm Interface (LEDs) ..............................................................13 11 Test Loops............................................................................................14 12 Management .........................................................................................14

12.1 TCP/IP Stack............................................................................14 12.2 SNMP Agent ............................................................................15 12.3 Real Time Clock.......................................................................16 12.4 Local Craft Terminal.................................................................16 12.5 Fault Management ...................................................................17 12.6 Configuration Management......................................................18 12.7 Performance Monitoring...........................................................18

13 Electrical Characteristics ....................................................................20 13.1 DC Supply Interface .................................................................20 13.2 Main Traffic Interface Electrical (STM-1)..................................20 13.3 Ethernet....................................................................................21 13.4 Tributary ...................................................................................21 13.5 Management Interface .............................................................23

14 Revision History...................................................................................23





1 Introduction

1.1 Scope

This document specifies the basic conditions and performances for MINI-LINK HC ETU 155 Ethernet Unit that can be guaranteed to customers.

1.2 Application

This specification is open to customers.

1.3 Definitions/Abbreviations

AIS Alarm Insertion Signal AMM Access Module Magazine DC Direct Current DCCr Data Communication Cannel RSOH DCN Data Communication Networks EMC Electro Magnetic Compatibility ETU Ethernet Traffic Unit GE Gigabit Ethernet GFP Generic Frame Procedure GFP-F Framed Generic Framing Protocol GUI Graphical User Interface HC High Capacity HMAC Hashed Message Authentication Code HTTP HypertexT Transfer Protocol ICMP Internet Control Management Protocol IP Internet Protocol LAN Local Area Network LAPS Link Access Procedure for SDH LBO Line Build Out LCAS Link Capacity Adjustment Scheme LCT Local Craft Terminal LED Light Emitting Diode LO Local Oscillator LOS Loss Of Signal MAC Media Access Control MDI Medium Dependent Interface MDI-X Medium Dependent Interface-X (crossed) MIB Management Information Base MLHC MINI-LINK HC MMU Modem Unit MST Multiplex Section Termination





PABX Private Automatic Branch Exchange PDH Plesiocronous Digital Hierarchy PHY Physical Interface POH Path Over Head PPP Point to Point Protocol RSOH Regeneration Section Overhead PSTN Public Switched Telephone Network RST Regenerator Section Termination SDH Synchronous Digital Hierarchy SES Severed Error Second SNMP Simple Network Management Protocol SNTP Simple Network Time Protocol SONET Synchronous Optical NETwork SPI SDH Physical Interface SSM Synchronous Status Message STM-1 Synchronous Transmission Module STS-3 Synchronous Transport Signal TCP Transmission and Control Protocol TRU Traffic Unit UAS Unavailable Seconds UDP User Datagram Protocol VC Virtual Container VCG Virtual Concatenation Group Vdc Volts Direct Current

2 Standards

[1] ETSI EN 301 489-1 Electromagnetic Compatibility and radio spectrum Matters (ERM); Electromagnetic Compatibility (EMC) standard for radio equipment and services; Part 1: Common technical requirements

[2] ETSI EN 301 489-4 Electromagnetic Compatibility and radio spectrum Matters (ERM); Electromagnetic Compatibility (EMC) standard for radio equipment and services; Part 4: Specific conditions for fixed radio links and ancillary equipment and services.

[3] FCC part 15 Federal Communication Commission - Part 15 Radio Frequency Devices

[4] GR-1089-CORE Electromagnetic Compatibility and Electrical Safety- Generic Criteria for Network Telecommunication Equipment.

[5] EN 60950 Safety of Information Technology Equipment

[6] UL 60950 Information Technology Equipment – Safety

[7] CAN/CSA C22.2 No 60950 Information Technology Equipment





[8] ITU-T G.783: General aspects of digital transmission systems; terminal equipments; Characteristics of Synchronous Digital Hierarchy (SDH) equipment functional blocks (10/00)

[9] ITU-T G.783: General aspects of digital transmission systems; terminal equipments; Characteristics of Synchronous Digital Hierarchy (SDH) equipment functional blocks (10/00)

[10] ITU-T G.707, Network Node Interface for the synchronous digital hierarchy.

[11] ITU-T G.813 Timing characteristics of SDH equipment slave clocks (SEC)

[12] ITU-T G.703 Physical/electrical characteristics of hierarchical digital interfaces

[13] ITU-T G.7041, Generic Frame Procedure

[14] ITU-T X.85, IP over SDH using LAPS

[15] ITU-T X.86, Ethernet over LAPS

[16] ITU-T G.7042, Link Capacity Adjustment Scheme (LCAS) for virtual concatenation signals

[17] ITU-T G.826, End-to-end error performance parameters and objectives for international, constant bit-rate digital paths and connections

[18] ITU-T G.828, Error performance parameters and objectives for international, constant bit rate synchronous digital paths

[19] ITU-T G.829, Error performance events for SDH multiplex and regenerator sections

[20] IEEE 802.3, Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications

[21] IETF RFC2863, The Interfaces Group MIB

[22] ITU-T M.2120, International transmission systems, telephone circuits, telegraphy, facsimile and leased circuits

[23] ETSI ETS 300 132-2 Equipment Engineering (EE); Power supply interface at the input of telecommunication equipment; Part 2 Operated by direct current (DC)

[24] ITU-T G825 The control of jitter and wander within digital networks which are based on synchronous digital hierarchy

[25] ITU-T G783 Characteristic of digital hierarchy SDH: equipment functional block (02/2004)





[26] IEEE 802.3u Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications. Type 100Base-T MAC parameters, Physical layer, MAUs, and Repeater for 100Mbit/s Operation.

[27] IEEE 802.3ab Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications. Physical layer Parameters and Specifications for 1000Base-T Operation over 4 pair of category 5 balanced copper cabling, type 1000Base-T.

[28] ITU-T G823 The control of jitter and wander within digital networks which are based on the 2048 Kbit/s hierarchy

[29] ITU-T G824 The control of jitter and wander within digital networks which are based on the 1544 Kbit/s hierarchy

[30] ETSI-ETS 300 019-1-3

[31] Bellcore GR-63-CORE

[32] Bellcore GA-253-CORE

[33] ITU-T G.7712/Y.1703 Architecture and specification of data communication network

[34] ITU-T X.735: Data communication networks; information technology – Open systems interconnection – System management: log control function.

[35] ITU-T X.733: Data communication networks; information technology – Open systems interconnection – System management: alarm reporting function

[36] RFC 0768 User Datagram Protocol

[37] RFC 0791 Internet Protocol

[38] RFC 0792 Internet Control Message Protocol

[39] RFC 0793 Transmission Control Protocol

[40] RFC 1157 Simple Network Management Protocol (SNMP)

[41] RFC 1661 The Point-to-Point Protocol (PPP)

[42] RFC 1812 Requirements for IP Version 4 Routers

[43] RFC 1901 Introduction to Community-based SNMPv2

[44] RFC 1902 Structure of Management Information for Version 2 of the Simple Network Management Protocol (SNMPv2)

[45] RFC 1903 Textual Conventions for Version 2 of the Simple Network Management Protocol (SNMPv2)





[46] RFC 1904 Conformance Statements for Version 2 of the Simple Network Management Protocol (SNMPv2)

[47] RFC 1905 Protocol Operations for Version 2 of the Simple Network Management Protocol (SNMPv2)

[48] RFC 1906 Transport Mappings for Version 2 of the Simple Network Management Protocol (SNMPv2)

[49] RFC 1907 Management Information Base for Version 2 of the Simple Network Management Protocol (SNMPv2)

[50] RFC 1908 Coexistence between Version 1 and Version 2 of the Internet-standard Network Management Framework

[51] RFC 2104 HMAC: Keyed-Hashing for Message Authentication

[52] RFC 2571 An Architecture for Describing SNMP Management Frameworks

[53] RFC 2572 Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)

[54] RFC 2573 SNMP Applications

[55] RFC 2574 User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)

[56] RFC 2575 View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)

[57] ITU-T V.24: List of definitions for interchange circuits between data terminal equipment (DTE) and data circuit-terminating equipment (DCE)





3 Description

ETU 155 Ethernet Unit is used in connection with MINI-LINK HC (MINI-LINK HC SDH/SONET Radio for Short Haul Applications Product Specification 1/1301-HRA 901 01/1) system in order to provide a solution to transport Ethernet frames over SONET/SDH.

The ETU 155 is an additional unit to be placed into MINI-LINK HC Access Module Magazine (AMM) slot number 1. MINI-LINK HC can be either in 1+0 or 1+1 configuration.

ETU 155 is linked to TRU by means of the STM-1 connection and is powered by a connector placed on the front panel.

ETU 155 Unit / MINI-LINK HC in 1+1 Configuration

MMU

TRU

ETU 155E1/DS1

FE/GE

Empty slot

ETU 155 Unit / MLHC in 1+0 Configuration

MMU

TRU

ETU 155

MMU

TRU

ETU 155FE/GE

Empty slot

FE/GE

MMU

TRUMMU

ETU 155E1/DS1

FE/GE

MMU

TRUMMU

ETU 155

MMU

TRUMMU

ETU 155





3.1 Use cases

Scenario 1: MLHC with ETU 155 Unit interconnects directly two generic Ethernet networks and two PABXs. ETU 155 Ethernet unit outfits MINI-LINK HC at both ends.

Scenario 2: MLHC with ETU 155 Ethernet Unit maps /de-maps Ethernet traffic over/from a generic SDH transport network and addresses to a remote LAN. A standard Ethernet mapping over SDH (GFP) allows addressing a multi-vendor scenario; ETU 155 Ethernet unit outfits MINI-LINK HC only at one end.

1xGE 4x10/100 BASE - T

4xE1/DS1

STM-1

Ethernet MINI - LINK HC With ETU 155

MINI-LINK HCWith ETU 155

Ethernet

PABX

1xGE 4x10/100 BASE-T

4xE1/DS1 1xGE 4x10/100 BASE - T

STM-1

Ethernet MINI - LINK HC With ETU 155

MINI-LINK HCWith ETU 155

Ethernet

PABX

1xGE 4x10/100 BASE-T

PABX PABX


4xE1/DS1STM-1/OC-3Standard Mapping

STM-1

Ethernet

PSTN

MINI - LINK HC With ETU 155 MINI-LINK HCSDH

Ethernet

PABX


STM-1/OC-3Standard Mapping

STM-1

Ethernet

PSTN

MINI - LINK HC With ETU 155 MINI-LINK HCSDH

Ethernet

PABX





4 Environmental Conditions

ETSI Market

According to ETSI-ETS 300 019-1-3 Class 3.1E (ref. [30])

Low temperature -5°C

High temperature +45°C

Relative humidity range: 5 to 95 %

ANSI Market

According to GR-63-CORE (ref. [31]).

Low temperature 5°C

High temperature 40°C

Relative humidity range: 5 to 85%

5 EMC

ETSI Market

Compliant to ETSI EN 301 489-1 (ref. [1]) and ETSI EN 301 489-4 (ref. [2]).

ANSI Market

Compliant to FCC part 15 (ref. [3]) and GR-1089-CORE (ref. [4]).

6 Safety

The unit is designed and constructed so that, under all conditions of normal use and under likely fault conditions, operative personnel is protected against risk for personal injury included fire originating from the equipment.

In compliance with EN 60950 (Ref.[5]), UL 60950 (ref. [6]) and CAN/CSA C22.2 No 60950 (ref. [7]).





7 Main Characteristics

• 1 x STM-1 Electrical

• GE Interface: 1 x 1000BASE-T

• FE Interfaces: 4 x 10/100BASE-T

• 4 x E1/DS1

• Synchronization I/O port:

• IP Based management

- SNMPv1, SNMPv2 and SNMPv3

- TCP/IP Stack

- One RS232 for local management

8 Functional Blocks and Features

ETU 155 Ethernet Unit provides built-in multi-service aggregation; mapping Ethernet traffic and E1/DS1 channels over SONET/SDH. The unit can be logically split into the following main macro-blocks:

• SDH/SONET Mapper

• System Timing

10/100/1000Mbit/s Ethernet

Fast/GigabitPHY

PDH trib.PHY

SDH/SONETMapper

SDH/SONET

Eth.Mapper

PDHMapper

Fast/GigabitPHY

SystemTiming∼

E1/DS1

SDH STM-1to

TRU

LO

LineSynch

Ext. Synch2 MHz - 2 Mb/s

OutputSynch 2 MHz





The SONET/SDH Mapper block allows mapping the 10/100/1000 Mbit/s Ethernet traffic and adding/dropping E1/DS1 channels into SONET/SDH STM-1/STS-3 frame.

The System Timing block allows distributing timing in the equipment. It keeps the clock signal within certain tolerances and to a certain quality, monitoring the input synchronization signals, such as line synchronization and external synchronization.

8.1 SDH/SONET Mapper

STM-1 Framer

The standard STM-1 frame building function is provided according to ITU-T G.783 (ref. [8]).

The standard STS-3 frame building function is provided according to Bellcore GA-253-CORE (ref. [32]).

OH Handling

ETU 155 Unit is able to process all RSOH and MSOH section and line (POH) bytes (ref. [10]).

8.2 Ethernet Mapper

It encapsulates Ethernet frames at 10/100 Mbit/s using GFP-F protocol in accordance with ITU-T G.7041 (ref. [13]).

It encapsulates Ethernet frames at 1000 Mbit/s using GFP-F protocol in accordance with ITU-T G.7041 (ref. [13]).

It encapsulates 10/100/1000 Mbit/s Ethernet frames using LAPS protocol in accordance with ITU-T X.85 (ref. [14]) and ITU-T X.86 (ref. [15])

Either GFP or LAPS Ethernet encapsulation schemes are software selectable during installation/configuration phase.

It is possible to map Ethernet frames using virtual concatenation according to ITU-T G.707 (ref. [10]).

It is possible to map Ethernet frames using contiguous concatenation in accordance with ITU-T G.707 (ref. [10]).

LCAS scheme can be used to add/remove virtual containers to/from VCGs according to ITU-T G.7042 (ref. [16]).

10/100 Mbit/s Ethernet VCGs are mapped on VC12s, VC3 and VC4.

1000 Mbit/s Ethernet VCGs are mapped on VC4s.





1000 Mbit/s Ethernet VCGs can be mapped on VC12s and VC3s.

At each Ethernet port ETU 155 corresponds one VC group and the selection of VC groups is software configurable.

The Fast Ethernet and Gigabit Ethernet mapping could be activated in mutually exclusive way.

8.3 PDH Mapper

The ETU 155 provides for low order terminal multiplex capabilities, multiplexing either E1 or DS1 channels.

Tributary channels (E1/DS1) are software selectable, during installation/configuration phase.

• E1 Mapping: 4 x E1 can be mapped to and from any VC-12

• DS1 Mapping: 4 x DS1 can be mapped to and from any VC-11/VC-12

8.4 Interfaces Specification

10/100BASE-T interface supports auto-Negotiate in compliance with Clause IEEE 802.3u Clause 28.

10/100/1000BASE-T interface supports auto-Negotiate in compliance with IEEE 802.3ab.

All Ethernet interfaces support:

• Auto-Negotiation (°)/manual configuration of speed (10/100/1000 Mbit/s)

• Auto-Negotiation (°)/manual configuration of duplex mode (half/full duplex)

• Flow Control according to IEEE 802.3x

- If operating in full-duplex mode they support both auto-negotiation (°) and manual configuration (active/de-activate) of flow control

• Auto MDI/MDI-X (°) and fixed RX and TX

(°) Default configuration.





9 Synchronisation

The synchronization signal source in the ETU 155 can be configured as follow:

• SSM enabled: the source is selected on quality/priority basis

• SSM disabled: the source is selected on a priority basis

• Forced: if the selected source degrades ETU 155 switches to free-running mode

ETU 155 has got the following synchronisation timing sources.

• External sources:

- 1 x 2 MHz

- 1 x E1 / 1 x DS1 (first tributary port)

• STM-1 Line interface

• Local oscillator (when in “free-running” mode)

The synchronization source is manually selectable by LCT and the default synchronization source is the local oscillator. ETU 155 local oscillator stability is in compliant with ITU-T G.813 (ref. [11]).

Switchback to the selected source is automatically performed whenever it becomes available again and remains available for the wait to restore time. The alarm is cleared when the switchback is successful.

ETU 155 manages the SSM strategy both in generating/evaluating the incoming/outgoing frame according to ITU-T G.783 (ref. [9]) and ITU-T G.813 (ref. [11]).

ETU 155 provides the following output synchronization ports:

• 1 x 2 MHz

10 Local Alarm Interface (LEDs)

Two LEDs on front panel fulfil this function:

• Green LED: ON when the ETU 155 is correctly powered

• Red LED: ON when at least one of ETU 155 functional block is faulty

RJ-45 Ethernet connectors have got an integrated LED showing data activities.





11 Test Loops

The following loops are available for test purposes:

• E1/DS1 loop-back

• SPI loop-back (in order to remove the loop remotely, the DCN connection over STM-1 side is preserved)

• Telecom-bus loop-back. It can be split up in:

- SDH Line Side loop-back from receive to transmit telecom bus

- Ethernet or Local Side loop-back from transmit to receive telecom bus

• MAC bus loop-back

12 Management

ETU155 Ethernet Unit has got an embed IP based management application acting as a single network element. ETU155 and the TRU interoperate only at the IP level, acting as IP routers within the O&M network.

12.1 TCP/IP Stack

IP protocol version 4 is supported, according to RFC 791 (ref. [37]), with a basic static IP routing algorithm in accordance with RFC 1812 (ref. [42]). The default gateway IP address can be set/unset by the management system.

ICMP for IP version 4 is in compliance with RFC 792 (ref. [38]).

TCP is in compliance with RFC 793 (ref. [39]).

UDP is in compliance with RFC 768 (ref. [36]).

In order to establish the connection between the ETU 155 and a PC acting as LCT, the RS232 interface supports a PPP numbered link.

The connection to the IP DCN for the remote management is provided through a numbered PPP channel set up with the TRU (STM-1 DCCr bytes of the line side).

The PPP channel is in compliance with RFC 1661 (ref. [41]).

The PPP channel on the DCCr bytes is in compliance with ITU-T G.7712 (ref. [33]) and Y.1703 (ref. [33]) paragraph 7.1.2.1.1.





12.2 SNMP Agent

12.2.1 SNMPv1

The agent supports SNMPv1 according to RFC 1157 (ref. [40]).

12.2.2 SNMPv2

The agent complies with:

• RFC 1901 (ref. [43]): Introduction to Community-Based SNMPv2

• RFC 1902 (ref. [44]): Structure of Management Information for SNMPv2

• RFC 1903 (ref. [45]): Textual Conventions for SNMPv2

• RFC 1904 (ref. [46]): Conformance statements for SNMPv2

• RFC 1905 (ref. [47]): Protocol Operations for SNMPv2

• RFC 1906 (ref. [48]): Transport Mappings for SNMPv2

• RFC 1907 (ref. [49]): Management Information Base for SNMPv2

• RFC 1908 (ref. [50]): Co-existence Between Version 1 and Version 2 of the Internet-Standard Network Management Framework

12.2.3 SNMPv3

The agent complies with:

• RFC 2571 (ref. [52]): An architecture for Describing SNMP Management Frameworks

• RFC 2572 (ref. [53]): Message Processing and Dispatching for SNMP

• RFC 2573 (ref. [54]): SNMPv3 Applications

• RFC 2574 (ref. [55]): User-Based Security Model for SNMPv3

• RFC 2575 (ref. [56]): View-Based Access Control Model VACM for SNMP

The SNMP agent uses the authentication/no privacy security level. The authentication algorithm is HMAC-MD5-96 protocol, according to RFC 2104 (ref. [51])

The SNMP interface supports two users with different kind of access privileges:

• View user: only read access

• Control user: unlimited access (read/write/create)





12.2.4 Manager Integration

ETU 155 Ethernet Unit agent is able to interface SNMP managers, implementing specific MIB objects.

12.2.5 Supported MIBs

• ETU155 MIB for handling unit configuration

• ETU155 MIB for handling unit alarms

• ETU155 MIB for handling unit performances

12.3 Real Time Clock

An internal real time clock is used as reference for the time-stamp of all management operations, with accuracy no more than +/- 20 ppm (i.e. +/- 2 sec per day). It is able to maintain the current time up to 24 hours after a possible power loss. It is possible to set the current time via either SNMP or SNTP.

12.4 Local Craft Terminal

It presents a Java Applet based user-friendly GUI to allow the operator interfacing with the unit. The applet provides access to all of the internal managed objects related to configuration, performance and fault management. Main features:

• GUI based on Java Applet to provide:

- Configuration Management

• Inventory data

• Configuration file upload/download

• SNTP configuration

- Fault Management

• Active Alarm List

• Alarm Log

- Performance monitoring

• Start/Stop/Reset PM counters

• Threshold setting

- FW Upgrade

• Applet runs over Sun Java Virtual Machine





• Access based on a User ID and password mechanism (admin. /generic users) with up to 5 simultaneous LCT instances

• Embedded WEB server supporting HTTP 1.1 to provide the capabilities for downloading the applet to host PC.

12.5 Fault Management

SDH Side

A mechanism to filter alarms to be sent to the management application, after specific correlation operations, is implemented according to ITU-T G.783 (ref. [9]).

Five levels of equipment alarms report to the management application, according to ITU-T X.733 (ref. [35]):

• Normal: neither alarm nor test operation are active on the equipment

• Warning: the equipment is in test mode

• Minor: an alarm not traffic affecting is active

• Major: an alarm possibly traffic affecting is active

• Critical: a traffic affecting alarm is active

To provide the corresponding alarm information to the management application collection of SDH MST and Path layer faults are handled according to ITU-T G.783 (ref. [9]).

To provide the corresponding alarm information to the management application, collection of Ethernet faults are managed according to IEEE 802.3 (ref. [20]).

Cleared alarms are saved in an internal log according to ITU-T X.735 (ref. [34]).

Log reading has the possibility to filter the alarms according to time, severity and alarm-cause in accordance to ITU-T X.733 (ref. [35]).

Alarm log file can record up to 100 entries (discarding the oldest entries).

PDH Side

ETU155 Ethernet unit collects and sends notifications for LOS and AIS defects.





12.6 Configuration Management

SDH Side

The ETU 155 is able to maintain internal objects representing the unit configuration parameters that can be managed by the LCT. The inventory data information is supported.

PDH Side

PDH tributary interfaces can be configured. PDH physical interfaces can be either enabled or disabled by the user.

Tributary E1

Configurable line code: HDB-3 / AMI.

Configurable LBO: short haul / long haul.

Tributary DS1

Configurable line code: B8ZS / AMI.

Configurable LBO: possible configurations in the short haul range.

12.7 Performance Monitoring

The ETU 155 is able to work out the performance monitoring of both SDH and Ethernet side

SDH side

Performance monitoring at RS (J0), MS VC-3/4 and VC-11/12 levels in the SDH hierarchy is in compliance with ITU-T G.826 (ref. [17]), ITU-T G.828 (ref. [18]) and ITU-T G.829 (ref. [19]).

MS layer

• Start/stop/reset G.829 counters

• Collect G.829 counters (15min/24h windows)

• Support alarm threshold setting for G.829 counters

VC-3/VC4








VC-11/VC-12s




Counters for MS layer, VC-12s and VC-4 are collected for both the near-end and the far-end site.

Data windowing is in compliance with ITU-T M.2120 (ref. [22]).

It is possible to activate/deactivate data collection on 15 Min and 24Hours windows independently.

It is possible for the equipment controller to set the current time on the board (performance data re-timing).

Ethernet Side

In compliance with IEEE 802.3 (ref. [20]) and IETF RFC 2863 (ref. [21]).

PDH Side

In compliance with ITU-T G.826 (ref. [17]), Annex B Table B.2 Type 4, specifying measurement criteria for performance monitoring on limited set of defect indications.

• Set for alarm rising and alarm falling thresholds for SES (15 Min and 24 Hours)

• Send the following notifications (SES): TR1-SES (15 Min), RTR1-SES (15 min) and TR2-SES (24 Hours)

• Send the notifications (UAS): UAT and UAT clear (for 15 Min only)





13 Electrical Characteristics

13.1 DC Supply Interface

13.1.1 Power Supply

The voltage supply is a DC voltage coming front panel connector. The power interface is in compliance with ETSI ETS 300 132 (ref. [23]).

Nominal input voltage (fully performance)

• Nominal: 24 ÷ 60 Vdc (plus or minus ground)

• With tolerance: 20.4 ÷ 72 Vdc

The primary power supply has got protection against reverse polarity and short circuit.

Connector type: 2 Pole D-sub male

13.1.2 Power Consumption

Power consumption: < 15 W.

13.2 Main Traffic Interface Electrical (STM-1)

The STM-1 interface is in compliant to ITU-T G. 703 (ref. [12])

Nominal bit rate: 155.520 Mb/s

TX frequency tolerance: +/- 4.6 ppm

RX locking range: +/- 20 ppm

Line code: CMI

Return loss (8-240 MHz): > 15 dB

Pulse amplitude: 1V +/- 0.1 V

Impedance: 75 Ohm unbalanced

Nominal pulse width: 6.43 nsec

Maximum attenuation of input signal at 78MHz: 12.7 dB

The input jitter and output jitter are in accordance to ITU-T G.783 (ref. [25]).

Connector type: SMZ





13.3 Ethernet

13.3.1 10 Mbit/s Ethernet

Interface: 10 BASE-T in compliance with IEEE 802.3 (ref. [20])

Connector type: RJ-45

13.3.2 Fast Ethernet

Interface: 100 BASE-T in compliance with IEEE 802.3u (ref. [26])


13.3.3 Gigabit Ethernet

Interface: 1000 BASE-T in compliance with IEEE 802.3ab (ref. [27])


13.4 Tributary

13.4.1 E1 Interface

In accordance with ITU-T G.703 (ref. [12])

Nominal bit rate: 2.048 Kbit/s

Frequency tolerance: +/- 50 ppm

Line code: HDB-3 and AMI

Return loss at input port:

50 KHz - 100 KHz: >12 dB

100 KHz - 2 MHz: >18 dB

2 MHz - 3 MHz: >14 dB

Pulse amplitude: 3 V +/- 0.3 V

Impedance: 120 Ohm balanced

Nominal pulse width: 244 ns


The Jitter transfer is in accordance to ITU-T G.823 (ref. [25]).






13.4.2 DS1 Interface


Nominal bit rate: 1.544 Kbit/s

Frequency tolerance: +/- 32 ppm

Line code: B8ZS and AMI

Pulse amplitude: 2.4 V-3.6 V +/- 0.2 V

Impedance: 100 Ohm balanced

Nominal pulse width: 324 ns



13.4.3 Synchronization Interfaces

13.4.3.1 Input interfaces

E1 Tributary Signal


Input jitter according to ITU-T G.783 (ref. [9])


2 MHz Signal


Input jitter: according to ITU-T G.823 (ref. [28])

Connector type: DIN 1.6/5.6

13.4.3.2 Output interfaces

2 MHz Signal


Accuracy: in accordance with ITU-T G.813 (ref. [11])

Output jitter: according to ITU-T G.825 (ref. [24])

Connector type: DIN 1.6/5.6





13.5 Management Interface

RS232 serial interface port on the front panel is provided for local management. The RS232 interface is in compliance with ITU-T V.24 (ref. [57])

Connector type: 2 Pole D-sub female

14 Revision History

Rev. Date Author Description

A 05-05-31 C. Cermelli First issue of the document

ETU 155 Ethernet Unit for MINI-LINK HC Product Specification

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Transcript of ETU 155 Ethernet Unit for MINI-LINK HC Product Specification