metro1000 system description e,v3.20

8/14/2019 Metro1000 System Description E,V3.20

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OptiX 155/622H(Metro1000)System Description Contents

Huawei Technologies Proprietary

i

HUAWEI

OptiX 155/622H(Metro1000)STM-1/STM-4 MSTP

Optical Transmission System

System Description

V300R002


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OptiX 155/622H(Metro1000)STM-1/STM-4 MSTP

Optical Transmission System

System Description

Manual Version T2-040205-20050915-C-3.20

Product Version V300R002

BOM 31026905

Huawei Technologies Co., Ltd. provides customers with comprehensive technical support and service.

Please feel free to contact our local office or company headquarters.

Huawei Technologies Co., Ltd.Address: Administration Building, Huawei Technologies Co., Ltd.,

Bantian, Longgang District, Shenzhen, P. R. China

Postal Code: 518129

Website: http://www.huawei.com

Email: [email protected]


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Copyright 2005 Huawei Technologies Co., Ltd.

All Rights Reserved

No part of this document may be reproduced or transmitted in any form or by any meanswithout prior written consent of Huawei Technologies Co., Ltd.

Trademarks

, HUAWEI, C&C08, EAST8000, HONET, , ViewPoint, INtess, ETS, DMC, TELLIN,InfoLink, Netkey, Quidway, SYNLOCK, Radium, M900/M1800, TELESIGHT,Quidview, Musa, Airbridge, Tellwin, Inmedia, VRP, DOPRA, iTELLIN, HUAWEIOptiX,C&C08 iNET, NETENGINE, OptiX, iSite, U-SYS, iMUSE, OpenEye, Lansway,SmartAX, infoX, TopEng are trademarks of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this manual are the property of their

respective holders.

Notice

The information in this document is subject to change without notice. Every effort hasbeen made in the preparation of this document to ensure accuracy of the contents, butall statements, information, and recommendations in this document do not constitutethe warranty of any kind, express or implied.


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Summary of Updates

This section provides the update history of this manual and introduces the contents ofsubsequent updates.

Update History

Manual Version Notes

T2-040205-20050915-C-3.20 The manual is the first release.


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Contents

1 Product Overview 1-11.1 Network Application 1-11.2 Features 1-2

1.2.1 High Integration 1-21.2.2 Service Access Capability 1-21.2.3 Interface 1-31.2.4 Synchronous Clock Source 1-41.2.5 Supporting More than One System 1-41.2.6 Flexible Networking 1-41.2.7 Protection Mechanism 1-41.2.8 Uniform NM System 1-41.2.9 Power and Environment Monitoring 1-51.2.10 Synchronization Status Message Management 1-51.2.11 Interconnecting with Third-Party Equipment 1-5

1.3 Equipment Structure 1-71.3.1 Hardware Structure 1-71.3.2 System Architecture 1-8

1.4 Boards 1-92 Board Function and Application 2-1

2.1 SDH Interface Board 2-12.1.1 STM-4 Optical Interface Board OI4 2-12.1.2 STM-1 Optical Interface Board OI2S/OI2D/SL1Q/SL1O 2-22.1.3 STM-1 Electrical Interface Board SDE/SLE 2-3

2.2 PDH Interface Board 2-42.2.1 E1 Electrical Interface Board SP1/SP2/PD2S/PD2D/PD2T 2-42.2.2 E3/DS3 Electrical Interface Board PL3ES/PL3ED/PL3ET/PL3TS/PL3TD/PL3TT 2-5


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2.3 Ethernet Interface Board 2-62.3.1 ET1/ET1O/ET1D Board 2-62.3.2 EFS/EFT/EGS/EFSC/ELT2 Board 2-7

2.4 SCBE Board 2-10

2.5 UPM 2-113 Protection 3-1

3.1 Equipment-Level Protection 3-13.1.1 Power Input Unit 1+1 Hot Backup 3-13.1.2 Board Protection upon Exception 3-1

3.2 Network-level Protection 3-23.2.1 SDH Service Protection 3-2

3.3 Clock Protection 3-3

3.3.1 Clock Quality 3-33.3.2 Protection Process 3-4

4 Networking and Application 4-14.1 Basic Networking Modes 4-14.2 Interconnecting with Mobile Station Equipment 4-34.3 Interconnecting with Access Network Equipment 4-44.4 Interconnecting with Third-Party Equipment 4-54.5 Ethernet Service Application 4-7

4.5.1 EPL Service 4-74.5.2 EVPL Service 4-94.5.3 EPLAN Service 4-114.5.4 EVPLAN Service 4-124.5.5 Comparison among the Four Services 4-13

5 Maintenance and Management 5-15.1 Maintenance 5-15.2 Management 5-2

6 Technical Specifications 6-1

6.1 Equipment Parameter 6-16.2 Optical Interface Specifications 6-2

6.2.1 STM-1 Optical Interface Specifications 6-26.2.2 STM-4 Optical Interface Specifications 6-36.2.3 Allowable Frequency Deviation for the Optical Input Port 6-46.2.4 AIS Rate Tolerance of the Optical Output Port 6-4


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6.2.5 Ethernet Optical Interface 6-46.3 Electrical Interface Specifications 6-6

6.3.1 AIS Rate Tolerance of the Electrical Output Port 6-66.3.2 Allowable Attenuation for the Electrical Input Port 6-6

6.3.3 Allowable Frequency Deviation for the Electrical Input Port 6-66.3.4 Anti-Interference Capability for the Electrical Input Port 6-6

6.4 Ethernet Features Test Specification 6-76.5 Clock Timing and Synchronization 6-8

6.5.1 Output Jitter 6-86.5.2 Internal Oscillator Output Frequency in the Free-run Mode 6-86.5.3 Chronic Phase Variation 6-8

6.6 Jitter Specification 6-96.6.1 Output Jitter of the STM-1/STM-4 Synchronous Interface 6-96.6.2 Input Jitter Tolerance of the STM-1/STM-4 Port 6-96.6.3 Input Jitter Tolerance of the PDH Tributary Port 6-96.6.4 Mapping Jitter of the PDH Tributary Port 6-106.6.5 Combined Jitter of the PDH Tributary Port 6-10

6.7 Electromagnetic Compatibility 6-116.8 Environment Requirement 6-12

6.8.1 Storage Environment 6-126.8.2 Transportation Environment 6-14

6.8.3 Operation Environment 6-16

A Standards Compliance A-1A.1 ITU-T Recommendations A-1A.2 IEEE Standards A-3A.3 IETF Standards A-3A.4 Environment Standards A-3

B Abbreviations and Acronyms B-1Index i-1


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OptiX 155/622H(Metro1000)System Description Figures


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Figures

Figure 1-1Application in a transmission network 1-1Figure 1-2Front view of the OptiX 155/622H 1-2Figure 1-3Rear view of the OptiX 155/622H 1-2Figure 1-4Back view of the OptiX 155/622H 1-7Figure 1-5OptiX 155/622H system architecture 1-8Figure 1-6OptiX 155/622H slot layout 1-9Figure 3-1Fiber-shared virtual trail protection 3-2Figure 3-2Clock tracing status in normal conditions 3-4Figure 3-3Clock protection upon fiber cut between NE2 and NE3 3-5Figure 3-4Clock protection upon NE1 BITS failure 3-5Figure 3-5Clock protection upon NE1 and NE4 BITS clocks failure 3-6Figure 4-1Interconnecting with mobile station equipment 4-3Figure 4-2Access network application 4-4Figure 4-3Hybrid networking with the extended DCC bytes 4-5Figure 4-4Hybrid networking through DCC byte transparent transmission 4-5Figure 4-5Hybrid networking using the external clock interface to transmit management information 4-6Figure 4-6EPL service (transparent transmission) 4-8Figure 4-7EPL service (shared VCTRUNK) 4-8Figure 4-8EPL service (convergence) 4-9Figure 4-9EVPL service (shared VCTRUNK) 4-10Figure 4-10Transit application 4-10Figure 4-11EPLAN service 4-11Figure 4-12EVPLAN service 4-12Figure 6-1Input jitter tolerance template 6-10


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Tables

Table 1-1Supported service and quantity 1-3Table 1-2Interfaces on the OptiX 155/622H 1-3Table 1-3Protection modes supported by the OptiX 155/622H 1-4Table 1-4OptiX 155/622H board list 1-9Table 2-1Functions of OI2S, OI2D, SL1Q and SL1O 2-2Table 2-2Functions of SDE and SLE 2-3Table 2-3Functions of SP1S, SP1D, SP2D, PD2S, PD2D and PD2T 2-4Table 2-4Functions of PL3ES, PL3ED, PL3ET, PL3TS, PL3TD, and PL3TT 2-5Table 2-5Functions of ET1, ET1O and ET1D 2-6Table 2-6Functions of EFS, EFT, EGS, EFSC, and ELT2 2-8Table 3-1Encoding of the SSM 3-3Table 3-2Configuration of NE synchronization source and priority 3-4Table 4-1Basic networking modes 4-1Table 4-2Ethernet processing boards and supported services 4-7Table 4-3Comparison among four Ethernet services 4-13Table 6-1STM-1 optical interface specifications 6-2Table 6-2STM-4 optical interface specifications 6-3Table 6-3Allowable frequency deviation for the optical input port 6-4Table 6-4AIS rate tolerance of the optical output port 6-4Table 6-5Specification of EGS board optical interface 6-5Table 6-6Specification of ELT2 board optical interface 6-5Table 6-7AIS rate tolerance of the electrical output port 6-6Table 6-8Allowable attenuation for the electrical input port 6-6Table 6-9Allowable frequency deviation for the electrical input port 6-6Table 6-10Anti-interference capability for the electrical input port 6-6Table 6-11Test specification of single-port 10M bidirectional full duplex feature 6-7


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Table 6-12Test specification of single-port 100M bidirectional full duplex feature 6-7Table 6-13Output jitter of clock interface 6-8Table 6-14Internal oscillator output frequency in the free-run mode 6-8Table 6-15Chronic phase variation (MTIE) 6-8Table 6-16Chronic phase variation (TDEV) 6-8Table 6-17Output jitter of the STM-1/STM-4 synchronous interface 6-9Table 6-18Jitter tolerance of the STM-1/STM-4 input port 6-9Table 6-19Input jitter tolerance of the PDH tributary port 6-9Table 6-20Mapping jitter of the PDH tributary port 6-10Table 6-21Combined jitter of the PDH tributary port 6-10Table 6-22EMC test 6-11Table 6-23Environment requirement for storage 6-12Table 6-24Mechanical active substances content for storage 6-13Table 6-25Chemical active substances content for storage 6-13Table 6-26Mechanical stress for storage 6-13Table 6-27Environment requirement for transportation 6-14Table 6-28Mechanical active substances content for transportation 6-14Table 6-29Chemical active substances content for transportation 6-15Table 6-30Mechanical stress for transportation 6-15Table 6-31Requirement on temperature and humidity 6-16Table 6-32Other climate requirements 6-16Table 6-33Mechanical active substances content for operation 6-17Table 6-34Chemical active substances content for operation 6-17Table 6-35Mechanical stress for operation 6-17


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About This Manual

Release Note

This manual is for the OptiX 155/622H(Metro1000)STM-1/STM-4 MSTP OpticalTransmission System, V300R002.

Related Manuals

The related manuals are listed in the following table.

Manual Usage

OptiX 155/622H(Metro1000)STM-1/STM-4 MSTP OpticalTransmission System SystemDescription

Introduces the functionality, structure,performance, specifications, and theory of theproduct.

OptiX 155/622H(Metro1000)STM-1/STM-4 MSTP OpticalTransmission System Networkingand Application

Introduces the networking and protection ofSDH, PDH and Ethernet services. Introduces thenetwork management information, orderwire andclock planning.

OptiX 155/622H(Metro1000)STM-1/STM-4 MSTP OpticalTransmission System HardwareDescription Manual

Introduces the hardware of the product, includingchassis, power, fan, boards, and a variety ofinterfaces.

OptiX 155/622H(Metro1000)STM-1/STM-4 MSTP OpticalTransmission System Installation

Manual

Introduces the installation procedure, includinginstallation of chassis, components and cables.Requirements for grounding are introduced as

well.

OptiX 155/622H(Metro1000)STM-1/STM-4MSTP Optical Transmission SystemCommissioning Guide

Introduces the commissioning procedures,including preparations, NE commissioning,network commissioning and common indexestest.

OptiX 155/622H(Metro1000)STM-1/STM-4 MSTP OpticalTransmission System ConfigurationGuide

Introduces how to configure SDH service,Ethernet service and 64k service on T2000.


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Manual Usage

OptiX 155/622H(Metro1000)STM-1/STM-4 MSTP OpticalTransmission System Maintenance

Manual

Introduces the routine maintenance items andthe precautions, common faults and equipmentalarms, as well as the handling method.

OptiX 155/622H(Metro1000)STM-1/STM-4 MSTP OpticalTransmission System ElectronicManual (CD-ROM)

Contains all the above manuals in CD format,readable with Acrobat Reader.

Organization

The manual is organized as follows.

Chapter Description

Chapter 1 Product Overview Introduces features, structure, and its application intransmission networks of the OptiX 155/622H.

Chapter 2 Board Function andApplication

Introduces functions and applications of the boardsof the OptiX 155/622H.

Chapter 3 Protection Introduces the protection mechanism of the OptiX155/622H.

Chapter 4 Networking andApplication

Introduces networking and service applications ofthe OptiX 155/622H.

Chapter 5 Maintenance and

Management

Introduces the maintainability and network

management of the OptiX 155/622H.

Chapter 6 TechnicalSpecifications

Introduces the hardware structure and power supplyof the OptiX 155/622H.

Appendix A and Appendix B Appendix A introduces the standard compliance ofthe OptiX 155/622H.

Appendix B provides the abbreviations used in themanual.

Intended Audience

This document is for:

Network planner

Network designer

Network administrator


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Conventions

In this manual, the OptiX 155/622H is short for OptiX 155/622H(Metro1000)STM-1/STM-4 Optical Transmission System.

The manual uses the following conventions.Symbol Description

Warning

A warning notice with this symbol indicates a risk of personal injury.

Caution

A caution notice with this symbol indicates a risk to equipment damageor loss of data.

ImportantNote

An important note notice with this symbol helps you avoid anundesirable situation or indicates important supplementary information.

Note A note notice with this symbol indicates additional, helpful, non-criticalinformation.


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Contents

1 Product Overview 1-11.1 Network Application 1-11.2 Features 1-3

1.2.1 High Integration 1-31.2.2 Service Access Capability 1-31.2.3 Interface 1-41.2.4 Synchronous Clock Source 1-51.2.5 Supporting More than One System 1-51.2.6 Flexible Networking 1-51.2.7 Protection Mechanism 1-51.2.8 Uniform NM System 1-51.2.9 Power and Environment Monitoring 1-61.2.10 Synchronization Status Message Management 1-61.2.11 Interconnecting with Third-Party Equipment 1-6

1.3 Equipment Structure 1-81.3.1 Hardware Structure 1-81.3.2 System Architecture 1-9

1.4 Boards 1-102 Board Function and Application 2-1

2.1 SDH Interface Board 2-12.1.1 STM-4 Optical Interface Board OI4 2-12.1.2 STM-1 Optical Interface Board OI2S/OI2D/SL1Q/SL1O 2-22.1.3 STM-1 Electrical Interface Board SDE/SLE 2-3

2.2 PDH Interface Board 2-42.2.1 E1 Electrical Interface Board SP1/SP2/PD2S/PD2D/PD2T 2-42.2.2 E3/DS3 Electrical Interface Board PL3ES/PL3ED/PL3ET/PL3TS/PL3TD/PL3TT 2-5


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2.3 Ethernet Interface Board 2-62.3.1 ET1/ET1O/ET1D Board 2-62.3.2 EFS/EFT/EGS/EFSC/ELT2 Board 2-7

2.4 SCBE Board 2-10

2.5 UPM 2-113 Protection 3-1

3.1 Equipment-Level Protection 3-13.1.1 Power Input Unit 1+1 Hot Backup 3-13.1.2 Board Protection upon Exception 3-1

3.2 Network-level Protection 3-23.2.1 SDH Service Protection 3-2

3.3 Clock Protection 3-3

3.3.1 Clock Quality 3-33.3.2 Protection Process 3-4

4 Networking and Application 4-14.1 Basic Networking Modes 4-14.2 Interconnecting with Mobile Station Equipment 4-34.3 Interconnecting with Access Network Equipment 4-44.4 Interconnecting with Third-Party Equipment 4-54.5 Ethernet Service Application 4-7

4.5.1 EPL Service 4-74.5.2 EVPL Service 4-94.5.3 EPLAN Service 4-114.5.4 EVPLAN Service 4-124.5.5 Comparison among the Four Services 4-13

5 Maintenance and Management 5-15.1 Maintenance 5-15.2 Management 5-2

6 Technical Specifications 6-1

6.1 Equipment Parameter 6-16.2 Optical Interface Specifications 6-2

6.2.1 STM-1 Optical Interface Specifications 6-26.2.2 STM-4 Optical Interface Specifications 6-36.2.3 Allowable Frequency Deviation for the Optical Input Port 6-46.2.4 AIS Rate Tolerance of the Optical Output Port 6-4


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6.2.5 Ethernet Optical Interface 6-46.3 Electrical Interface Specifications 6-6

6.3.1 AIS Rate Tolerance of the Electrical Output Port 6-66.3.2 Allowable Attenuation for the Electrical Input Port 6-6

6.3.3 Allowable Frequency Deviation for the Electrical Input Port 6-66.3.4 Anti-Interference Capability for the Electrical Input Port 6-6

6.4 Ethernet Features Test Specification 6-76.5 Clock Timing and Synchronization 6-8

6.5.1 Output Jitter 6-86.5.2 Internal Oscillator Output Frequency in the Free-run Mode 6-86.5.3 Chronic Phase Variation 6-8

6.6 Jitter Specification 6-106.6.1 Output Jitter of the STM-1/STM-4 Synchronous Interface 6-106.6.2 Input Jitter Tolerance of the STM-1/STM-4 Port 6-106.6.3 Input Jitter Tolerance of the PDH Tributary Port 6-106.6.4 Mapping Jitter of the PDH Tributary Port 6-116.6.5 Combined Jitter of the PDH Tributary Port 6-11

6.7 Electromagnetic Compatibility 6-126.8 Environment Requirement 6-13

6.8.1 Storage Environment 6-136.8.2 Transportation Environment 6-15

6.8.3 Operation Environment 6-17

A Standards Compliance 1A.1 ITU-T Recommendations 1A.2 IEEE Standards 3A.3 IETF Standards 3A.4 Environment Standards 3

B Abbreviations and Acronyms i


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OptiX 155/622H(Metro1000)System Description Figures


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Figures

Figure 1-1Application in a transmission network 1-2Figure 1-2Front view of the OptiX 155/622H 1-3Figure 1-3Rear view of the OptiX 155/622H 1-3Figure 1-4Back view of the OptiX 155/622H 1-8Figure 1-5OptiX 155/622H system architecture 1-9Figure 1-6OptiX 155/622H slot layout 1-10Figure 3-1Fiber-shared virtual trail protection 3-2Figure 3-2Clock tracing status in normal conditions 3-4Figure 3-3Clock protection upon fiber cut between NE2 and NE3 3-5Figure 3-4Clock protection upon NE1 BITS failure 3-5Figure 3-5Clock protection upon NE1 and NE4 BITS clocks failure 3-6Figure 4-1Interconnecting with mobile station equipment 4-3Figure 4-2Access network application 4-4Figure 4-3Hybrid networking with the extended DCC bytes 4-5Figure 4-4Hybrid networking through DCC byte transparent transmission 4-5Figure 4-5Hybrid networking using the external clock interface to transmit management information 4-6Figure 4-6EPL service (transparent transmission) 4-8Figure 4-7EPL service (shared VCTRUNK) 4-8Figure 4-8EPL service (convergence) 4-9Figure 4-9EVPL service (shared VCTRUNK) 4-10Figure 4-10Transit application 4-10Figure 4-11EPLAN service 4-11Figure 4-12EVPLAN service 4-12Figure 6-1Input jitter tolerance template 6-11


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OptiX 155/622H(Metro1000)System Description Tables


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Tables

Table 1-1Supported service and quantity 1-4Table 1-2Interfaces on the OptiX 155/622H 1-4

Table 1-3Protection modes supported by the OptiX 155/622H 1-5Table 1-4OptiX 155/622H board list 1-10Table 2-1Functions of OI2S, OI2D, SL1Q and SL1O 2-2Table 2-2Functions of SDE and SLE 2-3Table 2-3Functions of SP1S, SP1D, SP2D, PD2S, PD2D and PD2T 2-4Table 2-4Functions of PL3ES, PL3ED, PL3ET, PL3TS, PL3TD, and PL3TT 2-5Table 2-5Functions of ET1, ET1O and ET1D 2-6Table 2-6Functions of EFS, EFT, EGS, EFSC, and ELT2 2-8Table 3-1Encoding of the SSM 3-3Table 3-2Configuration of NE synchronization source and priority 3-4Table 4-1Basic networking modes 4-1Table 4-2Ethernet processing boards and supported services 4-7Table 4-3Comparison among four Ethernet services 4-13Table 6-1STM-1 optical interface specifications 6-2Table 6-2STM-4 optical interface specifications 6-3Table 6-3Allowable frequency deviation for the optical input port 6-4Table 6-4AIS rate tolerance of the optical output port 6-4Table 6-5Specification of EGS board optical interface 6-5Table 6-6Specification of ELT2 board optical interface 6-5Table 6-7AIS rate tolerance of the electrical output port 6-6Table 6-8Allowable attenuation for the electrical input port 6-6Table 6-9Allowable frequency deviation for the electrical input port 6-6Table 6-10Anti-interference capability for the electrical input port 6-6Table 6-11Test specification of single-port 10M bidirectional full duplex feature 6-7


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OptiX 155/622H(Metro1000)System Description Tables


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Table 6-12Test specification of single-port 100M bidirectional full duplex feature 6-7Table 6-13Output jitter of clock interface 6-8Table 6-14Internal oscillator output frequency in the free-run mode 6-8Table 6-15Chronic phase variation (MTIE) 6-8Table 6-16Chronic phase variation (TDEV) 6-8Table 6-17Output jitter of the STM-1/STM-4 synchronous interface 6-10Table 6-18Jitter tolerance of the STM-1/STM-4 input port 6-10Table 6-19Input jitter tolerance of the PDH tributary port 6-10Table 6-20Mapping jitter of the PDH tributary port 6-11Table 6-21Combined jitter of the PDH tributary port 6-11Table 6-22EMC test 6-12Table 6-23Environment requirement for storage 6-13Table 6-24Mechanical active substances content for storage 6-14Table 6-25Chemical active substances content for storage 6-14Table 6-26Mechanical stress for storage 6-14Table 6-27Environment requirement for transportation 6-15Table 6-28Mechanical active substances content for transportation 6-15Table 6-29Chemical active substances content for transportation 6-16Table 6-30Mechanical stress for transportation 6-16Table 6-31Requirement on temperature and humidity 6-17Table 6-32Other climate requirements 6-17Table 6-33Mechanical active substances content for operation 6-18Table 6-34Chemical active substances content for operation 6-18Table 6-35Mechanical stress for operation 6-18


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OptiX 155/622H(Metro1000)System Description 1 Product Overview


1-1

1 Product OverviewThis chapter describes the OptiX 155/622H(Metro1000)STM-1/STM-4 OpticalTransmission System (OptiX 155/622H for short) in terms of its features, structure,and its application in transmission networks. The following tasks are described:

Network Application

Features

Equipment Structure

Network ApplicationThe OptiX 155/622His a type of STM-1/STM-4 chassis-shaped equipment developedby Huawei. It can access multiple types of services and can be used in MANs andlocal transmission networks as access equipment. It also serves as terminal units toaccess VIP private lines, wireless base stations, and digital subscriber line accessmultiplexers (DSLAM).

0 shows how the OptiX 155/622H is applied in a network.


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OptiX OSN 9500

Backbonelayer

OptiX 2500+(Metro3000)

OptiX 155/

622H(Metro 1000)

Convergencelayer

Access layer

OptiX 10G(Metro 5000)

OptiX 155/622H(Metro 1000)

OptiX 2500+(Metro3000)

OptiX Metro 500 OptiX Metro 500

OptiX 10G(Metro 5000)

Application in a transmission network


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Features

The case assembly of the OptiX 155/622H measures 436 mm (W) x 293 mm (D) x 86mm (H). 0 and 0 show its appearance.

Front view of the OptiX 155/622H

Rear view of the OptiX 155/622H

The OptiX 155/622H can access multiple types of services and interwork with theswitch, wireless base station and Ethernet switch.


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1-4

0 lists the services that the OptiX 155/622H can access and the access capability.

Supported service and quantity

Service Maximum access capability for single equipment

SDH 16 x STM-1(o), 6 x STM-1(e), 5 x STM-4

PDH 112 x E1, 96 x E1, 9 x E3, 9 x DS3

Ethernet 24 x FE(e), 6 x FE(o), 3 x GE(o)

0 lists the interfaces that the OptiX 155/622H provides.

Interfaces on the OptiX 155/622H

Interface type Description Connector

STM-1 optical interface: supports Ie-1,S-1.1, L-1.1, L-1.2 optical modules. SC/PCSTM-4 optical interface: supports Ie-4,S-4.1, L-4.1, L-4.2 optical modules. SC/PCSDH serviceSTM-1 electrical interface SMB

E1 electrical interface DB78 connectorPDH service

E3/DS3 electrical interface SMB

10Base-T, 100Base-TX RJ-45

100Base-FX LC

Serviceinterface

Ethernetservice

1000Base-SX/LX LC (SFP)

Clock interfaceTwo 75-ohm or 120-ohm external clockinterfaces

The clock signal can be 2048 kbit/s or2048 kHz.

RJ-45 or SMB

Power supply interface Two 48 V power interfaces that canaccess 60 V DC power 4-core socket

Environment monitoringinterface

The SCBE provides:

Four Boolean input interfaces/ TwoBoolean output interfaces

Four interfaces for transparent dataRJ-45 or DB9

One MODEM interface RJ-45 or DB9Management interface

One NM interface RJ-45

Orderwire interface One orderwire phone interface RJ-11


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1-5

In clock tracing mode, the OptiX 155/622H provides the following synchronous clocksources:

Two 2048 kHz or 2048 kbit/s G.703 external synchronous sources.

Line synchronous source of the three line interfaces IU1, IU2, and IU3.

Tributary synchronous source of the four tributary interfaces IU1, IU2, IU3, and IU4.

The synchronous sources of the line interface and the tributary interface of SCBE.

The OptiX 155/622H supports 26x26 VC-4 cross-connections, so it can serve as morethan one TM or ADM system. It also supports service grooming and protection amongthese systems. Thus, the networking capability and the service grooming capabilityamong networks are greatly improved.

The OptiX 155/622H can build networks flexibly. It supports point-to-point, chain, ring,HUB network, and mesh network.

The OptiX 155/622H serves as the access equipment and combine with HuaweiMetro and OSN series products to build networks. It can also combine with thethird-party equipment to build networks.

The OptiX 155/622H provides a comprehensive network protection system for allservices.

0 lists the SDH/PDH protection modes that the OptiX 155/622H supports.

Protection modes supported by the OptiX 155/622H

Protection mode Remark

Linear 1+1 multiplex sectionprotection (MSP) Linear 1:N (N5) MSP In this mode, the protection path can transport

extra services.Two-fiberunidirectional/bidirectional MSprotection ring Two-fiber

unidirectional/bidirectionalpath protection (PP) ring Sub-network connectionprotection (SNCP) When a service has both MSP and SNCP, setdelay time for the SNCP.Fiber-shared virtual trailprotection

The OptiX iManager NM system manages the OptiX 155/622H. The NM system


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1-6

provides management, maintenance and test for the optical transmission systemabout its fault, performance, configuration, and security. It also supports end-to-endmanagement function as required by the user. The NM system improves the quality ofnetwork service, reduces the maintenance cost and ensures good use of networkresources.

The OptiX 155/622H provides 48 V/60 V power interfaces to detect the inputvoltage and the voltage status (severely undervoltage, undervoltage, overvoltage, orseverely overvoltage).

The OptiX 155/622H also provides alarm input and output functions. The alarm inputfunction helps to monitor the environment of users remotely, while the alarm outputfunction can perform monitoring over all equipment alarms by outputting alarms to thecentralized alarm system.

The OptiX 155/622H supports synchronization status message (SSM) managementto enable the transmission network to:

Avoid timing loop in clock switching.

When the synchronous timing signal degrades, the downstream node can switchthe traced clock source or turn it into holdover mode before the degradationthreshold is crossed.

Simplify the planning of the clock synchronization network.

The OptiX 155/622H applies the following technologies to interconnect with the

third-party equipment.

DCC Byte Extension

The OptiX 155/622H uses the D4D12 of the MS overhead bytes as the physical pathto handle the management information of Huawei equipment, and uses the D1D3 ofthe regenerator section overhead bytes to handle the management information of thethird-party equipment.

Transparent Transmission of the DCC Byte

The OptiX 155/622H uses the D1D3 of the regenerator section overhead byte as thephysical path to handle the management information of Huawei equipment, and uses

the D4D12 of the MS overhead byte to transmit the management information of thethird-party equipment transparently.

Management Information Transmission Through the External Clock Interface

When the D1D12 bytes of the third-party equipment cannot transmit themanagement information of the OptiX 155/622H, use the external clock interface ofthe OptiX 155/622H to transmit it.

IP Over DCC

The OptiX 155/622H supports IP over DCC. When OptiX 155/622H, third-partyequipment and element management system (EMS) all support IP, the NMinformation is transparently transmitted through IP over DCC.


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1-7

TP4

The OptiX 155/622H supports TP4 (OSI over DCC). When OptiX 155/622H,third-party equipment and element management system (EMS) all support TP4, theNM information is transparently transmitted through TP4.


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1-8

Equipment Structure

As shown in 0, the OptiX 155/622H comprises a fan board, an air filter, a power filterboard, and the interface units that can be housed in the board area.

2

3

4

1

1. Chassis 2. Fan board (FAN) 3. Board area

4. Power filter board(POI) and air filter

Back view of the OptiX 155/622H

Fan board: dissipate heat for the equipment.

Air filter and POI: The air filter dissipates heat for the equipment together with thefan board, while the POI inputs power for the equipment

Board area: Houses service boards and system control boards; provides serviceand monitoring interfaces.


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1-9

In the OptiX 155/622H, the cross-connect unit is the core unit, assisted by the SDHinterface unit, PDH/Ethernet interface unit, clock unit, SCC and orderwire unit. 0illustrates the system architecture.

IU1

IU2

IU3

IU4

IU5

IU6

IU1

IU2

IU3

IU4

IU5

IU6

clockunit

SCC

unit

orderwireunit

STM-1/STM-4

E1

STM-1/STM-4Ethernet,E1,E3,T3

STM-1/STM-4

E1

externalclock

NMsystem

orderwirephone

cross-connect

unitEthernet,E1 Ethernet,E1



Ethernet,E1,E3,T3

STM-1/STM-4



OptiX 155/622H system architecture


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1-10

BoardsThe OptiX 155/622H provides seven physical slots to accommodate boards. 0 showsthe slot configuration and 0 lists the related boards.

FAN POIIU4

SCB

IU1IU2IU3

OptiX 155/622H slot layout

OptiX 155/622H board list

Board Full name Slot Interface type

OI2S1-channel STM-1 opticalinterface board

IU1, IU2, IU3 Ie-1, S-1.1, L-1.1, L-1.2, SC/PC

OI2D2-channel STM-1 opticalinterface board


SL1O8-channel STM-1 opticalinterface board

IU4 Ie-1, S-1.1, L-1.1, L-1.2, SC/PC

SL1Q4-channel STM-1 opticalinterface board

IU4 Ie-1, S-1.1, L-1.1, L-1.2, SC/PC

OI41-channel STM-4 opticalinterface board


SLE1-channel STM-1electrical interface board

IU1, IU2, IU3 75-ohm

SDE2-channel STM-1electrical interface board

IU1, IU2, IU3 75-ohm

SP18-channel E1 electricalinterface board

IU1, IU2, IU3 75-ohm/120-ohm E1 interface

SP2

16-channel E1 electrical

interface board IU1, IU2, IU3 120-ohm/75-ohm E1 interface

PD2S16-channel E1 electricalinterface board

IU4 120-ohm/75-ohm E1 interface

PD2D32-channel E1 electricalinterface board


PD2T48-channel E1 electricalinterface board


PL3ES1-channel E3 electricalinterface board

IU1, IU2, IU3 75-ohm E3 interface


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1-11

Board Full name Slot Interface type

PL3ED2-channel E3 electricalinterface board

IU1, IU2, IU3 75-ohm E3 interface

PL3ET3-channel E3 electricalinterface board IU1, IU2, IU3 75-ohm E3 interface

PL3TS1-channel DS3 electricalinterface board

IU1, IU2, IU3 75-ohm DS3 interface

PL3TD2-channel DS3 electricalinterface board


PL3TT3-channel DS3 electricalinterface board


SCBE System control board SCB

Provide 2 external clock inputand output interfaces, NM

interface, 1 orderwire interface, 4data interfaces.

4 input Boolean interfaces and 2output Boolean interfaces.

2 x STM-1/STM-4 opticalinterface (S-1.1, S-4.1, L-4.1,L-4.2, SC/PC) and 16 x E1electrical interface

ET1O8-channel Ethernetservice electricalinterface board

IU4Support Ethernet Layer 2switching. The maximum serviceaccess capacity is 48 x E1.

ET1D2-channel Ethernetservice electricalinterface board

IU1, IU2, IU3Support Ethernet Layer 2switching. The maximum serviceaccess capacity is 16 x E1.

EFS4-channel Ethernetservice interface board

IU1, IU2, IU3

Support Ethernet service Layer 2switching. The maximum serviceaccess capacity is 12 x VC-3 or126 x VC-12 + 6 x VC-3.

EFT4-channel Ethernetservice interface board

IU1, IU2, IU3

Support transparent transmissionof Ethernet service. Themaximum service accesscapacity is 6 x VC-3 or 63 x

VC-12 + 3 x VC-3.

ET18-channel Ethernetservice interface board

IU4

Support transparent transmissionof Ethernet service. Themaximum service accesscapacity is 48 x E1.

EGS1-channel GigabitEthernet optical interfaceboard

IU1, IU2, IU3

Support switching of GigabitEthernet service. The maximumservice access capacity is 12 xVC-3 or 126 x VC-12 + 6 x VC-3.


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OptiX 155/622H(Metro1000)System Description 2 Board Function and Application


2-1

2 Board Function and ApplicationThis chapter describes the functions and applications of the boards of the OptiX

155/622H. The OptiX 155/622H has the following types of boards:

SDH Interface Board

PDH Interface Board

Ethernet Interface Board

SCBE Board

UPM

SDH Interface BoardThe OptiX 155/622H provides the following types of SDH interface boards: STM-1,

STM-4 optical interface boards and STM-1 electrical interface boards. The SDHinterface board receives and transmits STM-1/STM-4 optical signals and STM-1electrical signals, performs section overheads and high-order path overheadsprocessing, and pointer explanation as defined in ITU-T G.783. In addition, it providesthe synchronous timing source for the clock unit.

SDH interface boards of the OptiX 155/622H:

STM-4 optical interface board (OI4)

STM-1 optical interface board (OI2S/OI2D/SL1Q/SL1O)

STM-1 electrical interface board (SDE/SLE)

Function

Access STM-4 optical signals.

Provide interfaces of four types of laser sources: Ie-4, S-4.1, L-4.1, and L-4.2.

Work as TM or ADM in slot IU1, IU2 or IU3.

Provide a synchronous timing source for the clock unit.

Support automatic laser shutdown (ALS) function.

Provide protection for data communication channel (DCC) and orderwirecommunications.


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2-2

Support MSP and SNCP.

Application

The OptiX 155/622H uses the OI4 to:

Form rings or chains operating at STM-4 rate. Combine with other Huawei equipment, such as OptiX 155/622(Metro2050)and OptiX

2500+(Metro3000)to form rings or chains operating at STM-4 rate.

Provide STM-4 interfaces to interconnect with the third-party equipment.

1 2/2/1/1

Function

Access STM-1 optical signals.

Provide four types of optical modules: Ie-1, S-1.1, L-1.1, L-1.2.

The OI2S and OI2D other than the SL1Q and SL1O boards provide synchronous

timing source for the clock unit. Support ALS.

Provide protection for DCC and orderwire communications.

The OI2S and OI2D boards support MSP and SNCP.

0 compares the functions of OI2S, OI2D, SL1Q, and SL1O.

Functions of OI2S, OI2D, SL1Q and SL1O

BoardItem

OI2S OI2D SL1Q SL1O

Interfacenumber 1 x STM-1 2 x STM-1 4 x STM-1 8 x STM-1Optical module Ie-1, S-1.1, L-1.1, L-1.2Slot IU1, IU2, IU3 IU1, IU2, IU3 IU4 IU4Connector SC/PCSynchronoussource number 1 2 None NoneDCCcommunication

D1D3

D4D12

D1D3

D4D12D1D3 D1D3

Application

Applications of the STM-1 optical interface board:

Form rings or chains operating at STM-1 rate.

Combine with other Huawei equipment, such as OptiX 155/622(Metro2050)and OptiX2500+(Metro3000)to form rings or chains operating at STM-1 rate.

Provide STM-1 interfaces to interconnect with the third-party equipment.

The SL1Q/SL1O does not support MSP and path protection. It connects to thelow-level transmission equipment like OptiX Metro 500 and OptiX Metro 100.


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2-3

1 /

Function

Access STM-1 electrical signals.

Detect and report the alarms and performance events on the line.

Support inloop and outloop of the line.

Work as TM or ADM in slot IU1, IU2 or IU3.

Provide synchronous timing source for the clock unit.

Support SNCP.

0 compares the functions of the SDE and SLE boards.

Functions of SDE and SLE

ItemBoard

Interfacenumber

Slot ConnectorSynchronoussource number

SDE 2 x STM-1 IU1, IU2, IU3 SMB 2

SLE 1 x STM-1 IU1, IU2, IU3 SMB 1

Application

Applications of the SDE/SLE:

Connect with other Huawei transmission equipment, such as OptiX 155/622(Metro2050)and OptiX 2500+(Metro 3000)to receive and transmit STM-1 electrical signals.

Interconnect with other equipment with STM-1 electrical interfaces, such asmicrowave equipment and ATM electrical interface equipment.


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2-4

PDH Interface BoardThe OptiX 155/622H provides E1, E3 and DS3 electrical interface boards. The PDHinterface board receives and transmits PDH services, and provides synchronoustiming sources for the clock unit.

PDH electrical interface boards of the OptiX 155/622H:

E1 electrical interface board SP1/SP2/PD2S/PD2D/PD2T

E3 electrical interface board PL3ES/PL3ED/PL3ET

DS3 electrical interface board PL3TS/PL3TD/PL3TT

1 1/2/2/2/2

Function

Access E1 signals.

Support asynchronous mapping of E1 signals to VC-12s, as defined in ITU-TG.703.

Provide two ITU-T G.703 compliant interfaces: 75-ohm non-balanced and 120-ohmbalanced.

Process the overhead bytes of VC-12 paths, configure the service path andmonitor its alarm and performance event, and communicate with the SCC unit.

Support inloop and outloop to test the quality of E1 services or locate the fault.


0 compares the functions of SP1, SP2, PD2S, PD2D and PD2T.

Functions of SP1S, SP1D, SP2D, PD2S, PD2D and PD2T

BoardItem

SP1 SP2 PD2S PD2D PD2T

Interface number 8 x E1 16 x E1 16 x E1 32 x E1 48 x E1Connector DB78 connectorSlot IU1, IU2,

IU3IU1, IU2,IU3

IU4 IU4 IU4

Synchronoussource number 2 2 2 4 6

Application

Connect to the E1 trunk of a switch to apply in a local network.

Connect to the optical line terminal (OLT) and the optical network unit (ONU) of anaccess network to apply the OptiX 155/622H the in the access network.

Interconnect with communication equipment that has standard E1 interfaces, suchas mobile base station, wireless access base station, and routers of Internetservice provider and LAN.


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2-5

3/3 3/3/3/3/3/3

Function

Access E3 or DS3 signals.

Map E3 or DS3 signals to VC-3 asynchronously, as defined in ITU-T G.703, andthen multiplex TU-3 into TUG-3.

Provide ITU-T G.703 compliant 75-ohm non-balanced E3 interfaces and100/120-ohm balanced DS3 interfaces.

Encode/Decode E3/DS3 signals to transmit and receive E3/DS3 signals.

Map E3/DS3 quasi-synchronous signals to VC-4 and demap VC-4 into E3/DS3quasi-synchronous signals.


0 compares the functions of PL3ES, PL3ED, PL3ET, PL3TS, PL3TD, and PL3TT.

Functions of PL3ES, PL3ED, PL3ET, PL3TS, PL3TD, and PL3TT

BoardItem

PL3ES PL3ED PL3ET PL3TS PL3TD PL3TT

Interfacenumber 1 x E3 2 x E3 3 x E3 1 x DS3 2 x DS3 3 xDS3Connector SMBSlot IU1, IU2,

IU3IU1,IU2, IU3

IU1,IU2, IU3

IU1, IU2,IU3

IU1,IU2, IU3

IU1,IU2,IU3

Interface

impedance 75-ohm 75-ohm 75-ohm 75-ohm 75-ohm 75-oh

m

Synchronoussource number 1 2 2 1 2 2

Application

Interconnect with telecommunication equipment that has standard E3 or DS3interfaces.


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2-6

Ethernet Interface BoardThe OptiX 155/622H provides a variety of Ethernet interface boards to receive andtransmit FE and GE signals.

According to the encapsulation protocol and mapping granularity, the Ethernetinterface boards fall into:

ET1/ET1O/ET1D boards: The encapsulation protocol is multi-link point to pointprotocol (ML-PPP) and the mapping granularity is VC-12.

EFS/EFT/EGS/EFSC/ELT2 board: The encapsulation protocol is generic framingprocedure (GFP) and the mapping granularity is VC-3 or VC-12.

1/1/1

Function

Provide 10M/100M Ethernet electrical interfaces and 100M optical interfaces, with

the electrical features (such as flow control) compliant with IEEE 802.3x standards.

Support auto-negotiation, 100M full/half duplex and 10M full/half duplex.

Support the ML-PPP encapsulation protocol with the encapsulation granularitybeing VC-12.

Provide bandwidth sharing and statistical multiplexing based on VLAN and port toimprove the bandwidth utilization.

Provide Ethernet Layer 2 switching.

Support isolation among different users, and VLAN isolation in one user

Support Ethernet private line (EPL) and Ethernet private LAN (EPLAN) services.

Support multicast and broadcast. Support the spanning tree protocol (STP) to avoid broadcast storm.

0 compares the functions of the ET1, ET1O and ET1D boards.

Functions of ET1, ET1O and ET1D

BoardItem

ET1 ET1O ET1D

Number of FEelectrical interface 8 8 2Connector RJ-45 RJ-45 RJ-45Slot

IU4 IU4 IU1, IU2, IU3

Working mode

Auto-negotiationFull duplexHalf duplex



Encapsulationprotocol ML-PPP ML-PPP ML-PPPVC-4 bandwidth atSDH side 1 1 1Binding bandwidth 48 x E1 48 x E1 16 x E1


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2-7

BoardItem

ET1 ET1O ET1D

Number ofVCTRUNK

16 16 16

Layer 2 switching - Support SupportVLAN Support Support Support

EVPL - - -

EPL Support - -

EPLAN - Support Support

EVPLAN - - -

STP - Support Support

ML-PPP Support Support Support

IGMP-SNOOPING - Support Support

Application

The ET1, ET1O and ET1D boards interconnect with PCs, routers or Ethernet switchesto transmit Ethernet services. Note that:

The ET1 board only supports transparent transmission of services and is onlyapplicable to EPL services.

The ET1O and ET1D boards support Layer 2 switching of services and areapplicable to EPLAN services.

The ET1, ET1O and ET1D are the same in encapsulation protocol and mappinggranularity and thus they are compatible with each other.

////2

Function

Provide IEEE 802.3x compliant 10M/100M and 1000M Ethernet interfaces.

Map Ethernet signals into VC-12 or VC-3.

Support GFP, link access procedure-SDH (LAPS), and high level data link control(HDLC) encapsulation protocols.

Support auto-negotiation and full duplex.

Receive and transmit test frames.

Identify and transparently transmit in-service test frames.

Support inloop for fast fault location and troubleshooting.

Collect, report test frame statistics, and generate alarms upon errors.

0 compares the functions of the EFS, EFT, EGS, EFSC, and ELT2 boards.


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2-8

Functions of EFS, EFT, EGS, EFSC, and ELT2

BoardItem

EFS EFSC EGS EFT ELT2

Number of FE

electrical interface 4 12 - 4 -Number of FE opticalinterface - - - - 2Number of GEoptical interface - - 1 - -Connector RJ-45 RJ-45 LC RJ-45 LCSlot IU1, IU2,

IU3IU4

IU1, IU2,IU3

IU1, IU2,IU3

IU1, IU2,IU3

FEelectricalinterface

Auto-

negotiationFull duplexHalf duplex

Auto-

negotiationFull duplexHalf duplex

Auto-negotiationFull duplex



FEopticalinterface

- - - -100M Fullduplex

Workingmode

GEopticalinterface

- -1000M Fullduplex

- -

VC-4 bandwidth at

SDH side4 4 4 2 2

Binding bandwidth12 x VC-3or 126 xVC-12 + 6x VC-3

12 x VC-3or 126 xVC-12+6 xVC-3

12 x VC-3or 126 xVC-12 + 6x VC-3

6 x VC-3 or63 x VC-12+ 3 x VC-3

6 x VC-3 or63 x VC-12+ 3 x VC-3

Number ofVCTRUNK

24 24 24 4 2

Layer 2 switching Support Support Support - -VLAN Support Support Support - -

EVPL Support Support Support - -

EPL Support Support Support Support Support

EPLN Support Support Support - -

EVPLN Support Support Support - -

STP Support Support Support - -

GFP Support Support Support Support Support

LAPS - - - Support Support


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2-10

SCBE BoardThe OptiX 155/622H provides two types of SCBE boards, SS46SCBE andSS45SCBE.

The SS46SCBE integrates the function of the system control & communication(SCC) unit, cross-connect (XC) unit, synchronous timing generator (STG) unit,engineering orderwire (EOW) unit, OI2D/OI4D and SP2D unit.

The SS45SCBE integrates the function of the SCC unit, XC unit, STG unit, EOWunit.

Function

The SCBE board combines functions of the line, tributary, cross-connect, clock, SCC,and orderwire modules. This section introduces the functions of each module.

Line module

Provide two STM-1/STM-4 optical interfaces. The STM-4 optical interface provides modules of three laser sources: S-4.1, L-4.1,

and L-4.2.

The STM-1 optical interface provides modules of one laser source: S-1.1

Provide two synchronous timing sources for the clock unit.

Support automatic laser shutdown (ALS) function.

Support MSP and SNCP.

Tributary module

Access 16 E1 signals.

Support asynchronous mapping of E1 signals to VC-12s, as defined in ITU-TG.703.

Provide two kinds of ITU-T G.703 compliant interfaces: 75-ohm non-balanced and120-ohm balanced.

Process the overhead bytes of VC-12 paths, configure the service path andmonitor its alarm and performance event, and communicate with the SCC unit.

Support inloop and outloop to test the quality of E1 services or locate the fault.


Cross-connect module

Support cross-connections at VC-4/VC-3/VC-12 level, to groom services from line

to line, from line to tributary, and from tributary to tributary. Support 26 x 26 VC-4 high-order cross-connection or 1638 x 1638 VC-12

low-order cross-connection.

Clock module

Provide two 2048 kHz or 2048 kbit/s external interfaces, with the impedance being75-ohm.

Support three clock working modes: tracing, holdover and free-run.

SCC module

Exchange information with other boards to configure equipment data and collectperformance and alarm data.


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2-11

Provide standard Ethernet NM interface and RS-232 data terminal equipment(DTE) interface to enable the NM to manage the equipment.

Orderwire module

Provide a line of orderwire phone for conference call and broadcast.

Provide four RS-232 serial data interfaces to enable point-to-multipoint equipmentconnection and data transparent transmission.

Provide 4-input and 2-output Boolean interfaces. The input Boolean value monitorsstatus of external equipment; the output Boolean value outputs alarm indicationsand controls the external equipment.

Application

As the core of the OptiX 155/622H, the SCBE board is responsible for servicegrooming, clock signal extraction, inter-board communication and orderwire. Since theboard combines the line unit and the tributary unit on it, it spares more slots.

UPMThe UPM is a 220 V AC to 48 V DC power converter specially designed for the OptiX155/622H. It consists of three functional modules: a double-channel hot-backupAC/DC module, a monitoring module, and a storage battery.

The following describes the functions and application of the UPM.

Functions

The UPM has the following functions:

The UPM provides two AC/DC rectifier modules. When one rectifier module fails,the other takes over all loads at once without affecting services. This greatlyimproves the stability of the whole system.

The AC/DC rectifier modules are hot swappable. Replacing a faulty one does notaffect the other one. This improves the maintainability of the system.

Each rectifier module supports a load capacity of 250 W.One working rectifier module is sufficient enough for two fully-configured or fourOptiX 155/622Hs with the standard configuration to work normally.

The UPM provides the storage battery. When the main power fails, the storagebattery starts to supply power for the equipment.The battery can ensure the power supply of one working OptiX 155/622H withstandard configuration for five to six hours.

The monitoring module of the UPM system can Monitor and control the rectifiermodules, the AC/DC power distribution, and parameters and statuses of thestorage battery, and report real-time information to T2000. Manage, protect, andcompensate temperature for the battery automatically. Measure thecharging/discharging current of the battery, and perform even/float charging andcurrent limitation on the battery through the rectifier module.

Application

The UPM serves as a backup of the power supply for the equipment. When the mainspower fails, it automatically switches to the battery to ensure uninterrupted powersupply.


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OptiX 155/622H(Metro1000)System Description 3 Protection


3-1

3 ProtectionThis section introduces the protection mechanism provided by the OptiX 155/622H:

equipment-level protection, network-level protection and clock protection.

Equipment-Level ProtectionSupported equipment-level protection:

Power input unit 1+1 hot backup

Board protection upon exception

1+1

The PIU board of the OptiX 155/622H can input two 48 V/60 V DC power supplies

at the same time, which serve as backup for each other. If either of them goes faulty,the other will operate to ensure the normal operation of the equipment.

Power Failure during Loading Software

The application program and data have the check function. If the loading is interrupted,the basic input/output system (BIOS) will not start the failed program and data, insteadit will wait until the software is fully loaded.

Overvoltage or Undervoltage

The lightning-proof component on the power supply board can reduce damage

caused by transient high voltage, such as lightning. If the voltage is too low, the centerprocessing unit (CPU) will be reset automatically and the software initializes the chipagain.

Software Upgrade

The system control and communication unit has two copies of NE software, allowingloading new software without affecting the running of the existing one. The newsoftware will replace the old one after being validated. The replace process will notaffect the configuration information, nor the services of NE. If the upgrade fails, theexisting software remains running.


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3-2

Network-level Protection

The OptiX 155/622H supports bi/uni-directional path protection, linear MSP, MSP ring,SNCP, inter-ring service protection and fiber-shared virtual trail protection.

Bi/Uni-directional Path Protection

The OptiX 155/622H supports bi-directional path protection and uni-directional pathprotection. The switching time is less than 50ms, as specified in ITU-T G.841recommendations.

Linear MSP

The linear MSP is specially applicable to chain networks. The OptiX 155/622H

supports 1+1 and 1:N (N5) protection. In 1:N protection mode, the protection system

can bear extra services. In this case, the switching time is less than 50ms, as specifiedin ITU-T G.841 recommendations.

MS Ring Protection

The OptiX 155/622H supports the two-fiber MS shared protection ring, compliant withITU-T recommendations G.841, and the switching time is less than 50ms.

SNCP

The OptiX 155/622H supports SNCP, compliant with ITU-T recommendations G.841recommendations. The switching time is less than 50ms even if more than oneservice is being switched at the same time.

Protection for Inter-Ring Services

The OptiX 155/622H provides protection for services between rings, for example,between an SNCP ring and an MSP ring. It is compliant with ITU-T recommendationsG.842.

Fiber-Shared Virtual Trail Protection

STM-1SNCP

STM-1SNCP

STM-4

STM-4

Fiber-shared virtual trail protection

As shown in 0, an STM-4 path is divided into several lower-order or higher-orderchannels, to be combined with other links to form loops at the path layer. These loopsat the path layer can be set with a proper protection mode (SNCP).


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3-3

Clock ProtectionIn SDH networks, the clocks are provided with protection as well.

S1 byte defined in the ITU-T Recommendation is used to transmit the qualityinformation of clock source. The higher 4 bits (b5 b8) of S1 byte are used to stand forthe quality of 16 types of synchronization sources, as listed in 0. The lower the S1 byteis, the higher the clock quality will be.

Encoding of the SSM

S1 (b5-b8) SDH synchronization quality level description

0000 Quality unknown (Existing Sync. network)

0001 Reserved

0010 Rec. G.811

0011 Reserved

0100 Rec. G.812 transit

0101 Reserved

0110 Reserved

0111 Reserved

1000 Rec. G.812 local

1001 Reserved

1010 Reserved

1011 Synchronous equipment timing source (SETS)

1100 Reserved

1101 Reserved

1110 Reserved

1111 Not used for synchronization

In SDH systems, the automatic protection switching of the clock is based on thefollowing protocols:

Among the currently available clock sources, an NE first selects a clock source atthe highest level of S1 byte as the synchronization source. It then sends the qualityinformation (or S1 byte) of the synchronization source to the following NE.

When the S1 byte information contained in multiple clock sources in the NE is thesame, the system will select the clock source of the higher priority level as per thepriority order in the priority level table as the synchronization source. It thentransmits the quality information of this synchronization source to the following NE.

If NE B traces the timing synchronization source of NE A, the clock of NE B is an


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3-4

unavailable synchronization source for NE A.

This section illustrates the automatic protection switching of the clock through an

example.In the transmission network shown in 0, the BITS clock signals are introduced to bothNE1 and NE4 through external timing interfaces. These two external BITS clocks arein mutual backup and they satisfy the requirements in ITU-T Recommendation G.812for the quality of the local timing reference source. Start the S1 bytes and set thetiming source protection.

The synchronization sources of each NE and their priorities are shown in 0.

In normal conditions, the clocks of the network should follow the BITS connected withNE1.

NE1 NE6

NE3 NE4

NE2 NE5

BITS

BITS

W W

W

WW

W

E E

E

EE

E

Clock tracing status in normal conditions

Configuration of NE synchronization source and priority

NE Synchronoussource Clock source priority

NE1External clocksource

External clock source, west clock source, east clocksource, internal clock source

NE2West clocksource

West clock source, east clock source, internal clocksource

NE3West clocksource

West clock source, east clock source, internal clocksource

NE4West clocksource

West clock source, east clock source, external clocksource, internal clock source

NE5East clocksource

East clock source, west clock source, internal clocksource

NE6East clocksource

East clock source, west clock source, internal clocksource

Clock Protection upon Fiber Cut between NE2 and NE3

If the optical fiber between NE2 and NE3 is broken, the synchronization clock will beswitched automatically. According to the above switching protocol, the clocking tracingstatus of NE3 and NE4 will change.


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3-5

The clock switching process is as follows:

(1) NE3: When the fiber between NE2 and NE3 is cut, the west clock source of NE3 islost. Since NE4 is tracing the clock of NE3, the clock quality message NE3 sends toNE4 is "unavailable". Therefore, NE3 can only use the internal clock source, not the

east clock source, and sends the information to NE4 by the S1 byte.(2) NE4: Upon receiving the message, NE4 finds the quality of the tracedsynchronization source has deteriorated (the original quality is the G.812 local, forwhich the higher four bits of the S1 byte are 1000). NE4 should select a new clockreference source that satisfies the quality requirement. According to the priorityconfiguration, only the east clock source and the external BITS clock can be used.Since the priority of the east clock is higher than that of the external BITS, NE4 selectsthe east clock as the synchronization source.

(3) NE3: After the synchronization source of NE4 is switched, the east clock source ofNE3 is available. Since the quality of the east clock source is highest, NE3 selects it asthe synchronization source.

The final clock tracing status is as shown in 0.

NE1 NE6

NE3 NE4

NE2 NE5

BITS

BITS

W W

W

W

W

E E

E

EE

Clock protection upon fiber cut between NE2 and NE3

Clock Protection upon NE1 BITS Failure

If the external BITS clock of NE1 fails, the clocks in the network should follow the clockof NE4 according to the switching protocol. The clock tracing status is shown in 0.

NE1 NE6

NE3 NE4

NE2 NE5BITS

W W

W

W

W

E E

E

EEW

E

Clock protection upon NE1 BITS failure

Clock Protection upon NE1 and NE4 BITS Clocks Failure

If the external BITS clocks of NE1 and NE4 fail, the clock source of the highest prioritywill be traced according to the switching protocol.

Assume that each NE in the network is synchronized with the clock of NE4 beforeboth BITS clocks failure. After analysis, we can know that the clock of each NE is stillsynchronized with the clock of NE4, as shown in 0. However, the synchronizationsource of the network declines from ITU-T G.812 local clock to the SETS clock.


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3-6

NE1 NE6

NE3 NE4

NE2 NE5

W W

W

W

W

E E

E

EEW

EInternal clock source

Clock protection upon NE1 and NE4 BITS clocks failure


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OptiX 155/622H(Metro1000)System Description 4 Networking and Application


4-1

4 Networking and ApplicationThis chapter introduces the basic networking modes and the applications of variousservices.

Basic Networking Modes

Interconnecting with Mobile Station Equipment

Interconnecting with Access Network Equipment

Interconnecting with Third-Party Equipment

Ethernet Service Application

Basic Networking ModesChain networks and ring networks are the basic structure of the transmissionnetworks. Several complex network structures are derived from them, as shown in 0.

Basic networking modes

Topology name Topology map

1 Chain

2 Ring

3Tangentrings


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4-2

Topology name Topology map

4Intersectingrings

5Ring withchain

6HUBnetwork

Legend:MADM ADM TM


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4-3

Interconnecting with Mobile StationEquipment

The OptiX 155/622H is used to transmit signals of mobile base transceiver stations(BTS). As shown in 0, the OptiX 155/622H systems form two STM-1 rings and anSTM-4 ring, where the E1 signal of BTS is transmitted to the base station controller(BSC) and then to the mobile switching center (MSC). In the network, ECC istransparently transmitted through the Ethernet interface to realize uniformmanagement over the network.

STM-1 Ring

STM-4 Ring

STM-1 Ring

BSC BSC

BSC

MSC

E1

E1

E1

E1

E1

E1

BTS

BTS BTS BTSBTS

BTS BTS

BTS

E1

E1 E1

E1

EccEcc

Interconnecting with mobile station equipment


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4-4

Interconnecting with Access NetworkEquipment

The OptiX 155/622H can work together with one of Huawei HONET productseries-optical network unit (ONU), to transmit data in the access network and transmitNM information of the access network. The OptiX 155/622H transmits access networkdata through the E1 interface and transmits NM information through the serial port.

Network Manager

ONU

NE1

NE2

NE3

NE3

ONU

ONU

Serial

Ethernet

Serial

Serial

Access network application


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4-5

Interconnecting with Third-PartyEquipment

The OptiX 155/622H uses the D4D12 overhead bytes and transmits D1D3 bytesthrough the external clock interface to exchange management information with theSDH equipment of other vendors.

DCC Byte Extension

As shown in 0, the OptiX 155/622H uses the D4D12 bytes of the multiplex section asits physical path to process the management information of Huawei equipment, anduses the D1D3 bytes of the regenerator section to transparent transmission themanagement information of the third-party equipment.

Other vendors'

equipment

D1-D3D4-D12 D4-D12

OptiX

155/622H

Huawei NMS

OptiX

155/622H

Other vendors' NMS

Hybrid networking with the extended DCC bytes

Transparent Transmission of the DCC Byte

As shown in 0, when the OptiX 155/622H is located in the core of a network, it needsto transparently transmit the management information of the third-party equipment.The OptiX 155/622H uses the D1D3 bytes of the regenerator section overhead as itsphysical path to process the management information of Huawei equipment, and usesthe D4D12 bytes of MS overhead to transparent transmission the managementinformation of the third-party equipment.

Other vendors'

equipmentOther vendors' NMS Huawei NMS

D1-D3 transmit

management ofHUAWEI equipmentD1-D3 D1-D3

D4-D12 transparently

transmit managementinformation of other

vendors' eq uipment

OptiX

155/622HOptiX

155/622H

Hybrid networking through DCC byte transparent transmission

Management Information Transmission through the External Clock Interface

If the D1D12 bytes of the third-party equipment cannot transmit the managementinformation of the OptiX 155/622H, the information can be transmitted through theexternal clock interface of the OptiX 155/622H. As shown in 0, the D1D3 bytes arecombined to an E1 signal in the SCBE board and sent to the external clock interface


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4-6

for output. Then, the signal is added to the line through the E1 interface of the tributaryboard and then to the SDH network as service data. After passing the third-partyequipment, the E1 signal is dropped to the tributary at the opposite OptiX 155/622H,accessed from the external clock input interface and then recovered to D1D3 bytesin the SCBE board.

Other vendors'transmission equipment

Other vendors'NMS

Huawei NMS

D1-D3OptiX

155/622H

OptiX155/622H

Externalclockinterface

E1interface

D1-D3D1-D3 Externalclockinterface

E1interface

Hybrid networking using the external clock interface to transmit management information

IP Over DCC

The scheme of IP over DCC uses the network layer protocol for NM informationtransmission. It is required that the gateway NE, external DCN and elementmanagement system (EMS) all support internet protocol (IP), thus the networkcomposed of the third-party equipment and the OptiX 155/622H can form a DCN.

IP over DCC has two networking topologies:

The NM information of the OptiX 155/622H is transparently transmitted through IPover DCC by the third-party equipment.

The NM information of the third party is transparently transmitted through IP overDCC by the OptiX 155/622H.

TP4

TP4 (OSI over DCC) adopts standard OSI protocol framework with its data link layer(DLL) and physical layer supporting Ethernet and DCC. When the two protocolsapplied at physical layer and DLL are completely compatible with other equipment,Huawei protocol can be interconnected with that of other vendors at network layer.

TP4 has two networking topologies:

The NM information of the OptiX 155/622H is transparently transmitted throughTP4 by the third-party equipment.

The NM information of the third party is transparently transmitted through TP4 bythe OptiX 155/622H.


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4-7

Ethernet Service ApplicationThe OptiX 155/622H supports four Ethernet service types: Ethernet private line (EPL),Ethernet virtual private line (EVPL), Ethernet private LAN (EPLAN), and Ethernetvirtual private LAN (EVPLAN). Different Ethernet processing boards may supportdifferent Ethernet service types, as shown in 0.

Ethernet processing boards and supported services

Supported serviceBoard

EPL EVPL EPLAN EVPLAN

ET1

ET1O

ET1D

EFS

EFSC

EGS

EFT

ELT2

EPL service application:

Point-to-point transparent transmission

Shared VCTRUNK

Shared medium access control (MAC)

Point-to-Point Transparent Transmission

In this transmission mode, the EPL service occupies the whole bandwidth and iscompletely isolated from other services. Therefore, this mode features high securityand is suitable for VIP private line services.

The ET1, EFS, EFT, EFSC, EGS and ELT2 boards all support this mode.

As shown in 0, the services of company A and company B need to be transparentlytransmitted between NE1 and NE2.


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4-8

A

B

VCTRUNK 1MAC1

MAC2

VCTRUNK 1

VCTRUNK2 VCTRUNK2

MAC1

NE1 NE2

B

A

MAC2

OptiX 155/622HEnterprise

user

EPL service (transparent transmission)

In NE1, the service of company A is accessed by MAC1 and the service of company Bis accessed by MAC2. In NE2, the service of company A is accessed by MAC1 andthe service of company B is accessed by MAC2.

After port route assignation, each companys services occupy a VCTRUNCK.

Shared VCTRUNK

The ET1, EFS, EFSC and EGS boards can converge and enable several EPLservices to share the bandwidth on the line. The EPL services are isolated by theVLAN ID.

Users sharing the VCTRUNK have to contend for the bandwidth. This mode applies tousers that differ in peak time.

0 takes the EFS as an example to illustrate the shared VCTRUNK.

VCTRUNK

A A'

NE1 NE2

B B'

CommunityCybercafe

OptiX 155/622H

VLAN100

VLAN200

VLAN100

VLAN200

MAC1 MAC2 MAC2 MAC1

EPL service (shared VCTRUNK)

In NE1, the service of user A1 is accessed through MAC1, and the service of user B1

through MAC2. The VLAN ID of user A1 is 100, and that of user B1 200. The servicesare converged on EFS and sent to NE2 over a VCTRUNK.

In NE2, the EFS board sends the service of VLAN ID 100 to A2, and 200 to B2.

Shared MAC Port

The ET1, EFS, EFSC and EGS boards can concentrate EPL services to implementpoint-to-multipoint transmission of Ethernet services. The EPL services are isolated bythe VLAN ID to share a MAC port.

0 takes the EFS as an example to illustrate the shared MAC port.


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4-9

Headquarters

NE1 NE2

Marketbranch

Technicalsupport branch

OptiX 155/622H Enterprise user

MAC1MAC2

VLAN100

MAC1

VLAN100

VLAN200VLAN200

VCTRUNK1

VCTRUNK2

EPL service (convergence)

In the network, the services of two branches of A need to be sent to and converged atthe headquarters. The headquarter also needs to send services to the two branches

in NE2.In NE1, two services (with VLAN ID of 100 and 200) of the headquarters share MAC1port of the EFS board. The EFS board sends the service of VLAN ID 100 to the marketdepartment in NE2, and that of VLAN ID 200 to the technical support department inNE2.

In NE2, the service of the market department is accessed through MAC1 of the EFS,and that of the technical support department is accessed through MAC2. The marketdepartment service is attached a VLAN ID 100 and sent to NE1 through VCTRUNK1.The technical support department service is attached a VLAN ID 200 and sent to NE1through VCTRUNK 2. In NE1, the two services are concentrated and output through aMAC port.

The EFS, EFSC, and EGS boards support EVPL services.

EVPL service applications:

Ingress/Egress

Transit

Ingress/Egress

Ingress and Egress are two operations to the label switch path (LSP). Ingressattaches an MPLS label and Egress strips the MPLS label. A typical application ofEVPL services is ingress the services when they enter the network and egress themwhen they leave the network. In this way, the services are isolated by the MPLS labelin the network.

The EVPL services adopt the MPLS technology. Its transmission efficiency is lowerthan the EPL and its configuration is more complicated.

0 takes the EFS board as an example to illustrate the application of ingress/egress.


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4-10

VCTRUNK1

Branch 1

NE1 NE2

Company A OptiX 155/622H

Branch 2

MAC1

MAC2

Marketdepartment

Technicalsupport

department

PPE

Ingress

P PE

Egress

MAC1

MAC2

VCTRUNK1VCTRUNK

Marketdepartment

Technicalsupport

department

EVPL service (shared VCTRUNK)

Company A has two branches, one in NE1 and the other in NE2. There is

communication between the two market departments and between the two technicalsupport departments respectively. Services of the two kinds of departments arecompletely isolated from each other and they share a 10 Mbit/s bandwidth. The twokinds of departments have the same VLAN ID, 100.

In this case, you can use EVPL to meet the requirement. The EVPL services use theMartini MPLS L2 VPN encapsulation and can identify the external label (Tunnel) andthe internal label (VC).

In NE1, the services of the market department are accessed through MAC1, and thatof the technical support department through MAC2. They are attached with differentMPLS labels (Tunnel and VC), converged in the EFS board, and then sent to NE2through VCTRUNK1.

In NE2, the EFS board assigns these services to their destinations by the MPLS label.

Transit

The Transit application forwards and transparently transmits MPLS data packets.

0 takes the EFS as an example to illustrate the Transit application.

VCTRUNK 1 (P)

MAC1(P)

VCTRUNK 1(P)

MAC1(P)

Branch1 ofcompany A

NE1 NE2

OptiX 155/622H Enterprise user

Branch2 ofcompany A

Transit LSPTransit LSP

VCTRUNK

Transit application

Company A has two branches, one in NE1 and one in NE2. The two branches need totransmit data services to each other. The OptiX 155/622H interconnects with anMPLS-supported router and the carried data packets are attached with MPLS label. Itis required that the OptiX 155/622H only transmits MPLS data packet on a bandwidthof 10 Mbit/s.

In this example, set the MAC and VCTRUNK ports of NE1 and NE2 to P, set the LSP


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4-11

operation to Transit. The MPLS data are transmitted transparently after labelswitching.

The EPLAN service realizes multipoint sharing of Ethernet services to save thebandwidth resources. It is compliant with the dynamic feature of data services.

The ET1O, ET1D, EFS, EFSC and EGS boards support the EPLAN application,isolating data with VB ID and VLAN ID.

Note:

The ET1O and ET1D boards support the ML-PPP encapsulation protocol and caninterconnect with each other. The mapping granularity is VC-12. The EFS, EFSC, andEGS boards support the GFP encapsulation protocol and can interconnect with eachother. The mapping granularity is VC-3 or VC-12. The boards of different

encapsulation protocols or mapping granularity cannot interconnect.

0 takes the EFS as an example to illustrate the EPLAN application.

OptiX 155/622H

Branch 2

MAC1

VCTRUNK1

VCTRUNK2

VBMAC1

MAC1

Branch 1

NE1 NE2

Company A

NE3Branch 3

Access point

Port 1

Port 1

Port 1

VB

VCTRUNK1

VB VCTRUNK1

EPLAN service

Company A has three branches, in NE1, NE2, and NE3 respectively. These branches

should be able to access each other. The branches share a 10 Mbit/s bandwidthdynamically. All sets of Ethernet equipment in Company A provide the 100M Ethernetoptical interface and they have the same VLAN ID 100.

The EFS board supports Ethernet data Layer 2 switching through the virtual bridge toimplement EPLAN.

In the system, each NE can establish one or more VBs. Each VB establishes a MACaddress table. The table is regularly updated through self-learning. When the serviceof Branch 2 is accessed in NE2, a VCTRUNK is selected according to the addresstable to send the service to Branch 1 or Branch 3. When the service of Branch 1 isaccessed in NE1, a VCTRUNK is selected according to the CAM address table tosend the service to Branch 2 or Branch 3.


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4-12

The ET1O, ET1D, EFS, EFSC, and EGS boards support STP. When the EPLANservice forms a loop, start the protocol to avoid broadcast storm.

The EFS, EFSC and EGS boards support EVPLAN.The EVPLAN isolates services by VLAN ID and MPLS label to isolate services ofdifferent users and isolate the service of a user but of different departments.

The EVPLAN application realizes multi-point sharing of the Ethernet service. However,different from the EPLAN, its Ethernet services all have connected LSP between anytwo nodes in the network and form a meshed network. This arrangement effectivelyreduces the risk of broadcast storms.

0 takes the EFS as an example to illustrate the EVPLAN application.

OptiX 155/622H

VB2VB1

VCTRUNK1

MAC1MAC2

VCTRUNK2

PE P

PE P

VCTRUNK1

MAC1

MAC2

Company B

Port 2

NE1 NE2

Company A

Branch 2

NE3

Branch 3

Access

point

Port 1

Port 1

Port 1LSP

Branch 3

Branch 2

Port 2

Port 2

Branch 1

VB2

VB1

VCTR

UNK2PE P PE P

VB2VB1

VCTRUNK2

MAC1MAC2

VCTRUNK1

P PE

PE P

LSP LSP

Branch 1

EVPLAN service

Company A has three branches, in NE1, NE2, and NE3 respectively. These branchesshould be able to access each other. Company B also has three branches in the threeNEs. These branches should be able to access each other. The two companies sharethe bandwidth but their services need to be isolated from each other. Both companiesaccess the data of VLAN ID 100.

The EFS board supports VB and MPLS encapsulation. The EVPLAN supports MPLSencapsulation and thus several VB users can share a VCTRUNK and dynamicallyshare bandwidth.

In NE1, A1 belongs to VB1 and B1 belongs to VB2. VB1 and VB2 share VCTRUNK1(bound with five VC-12) in one direction and VCTRUNK2 (bound with five VC-12) inthe other direction. So VB1 (Company A) and VB2 (Company 2) share the 10 Mbit/sbandwidth. In NE2 and NE3, the application is the same as NE1.


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4-13

0 compares the four kinds of Ethernet services.

Comparison among four Ethernet services

Service type Comparison

EPL

EPL is applicable to point-to-point services. This application fallsinto transparent transmission, shared VCTRUNK, and sharedMAC. The shared VCTRUNK and shared MAC applicationsisolate services by VLAN ID.

EVPLThe EVPL is applicable to the condition that the VLAN IDs of theaccessed services are the same, the services share a VCTRUNKwith each one isolated from each other.

EPLANEPLAN services are multipoint dynamic services. There areservices between every two nodes. To avoid broadcast storms,configure services into a chain when the STP is not started.

EVPLANThe EVPLAN is applicable to the condition that the VLAN IDs ofthe accessed services are the same, the services share aVCTRUNK with each one isolated from each other.


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OptiX 155/622H(Metro1000)System Description 5 Maintenance and Management


5-1

5 Maintenance and ManagementThis chapter introduces the maintainability and network management of theequipment.

Maintenance

Management

MaintenanceThe OptiX 155/622H provides powerful maintenance functions:

The SCBE board provides audible and visual alarm for emergency.

Support input and output of Boolean values for easy alarm collection.

Each board has running and alarm indicators for fast fault location.

Support automatic shutdown function of SDH single-mode optical interface.

Provide orderwire phone for dedicated communication of the maintenancepersonnel.

Monitor equipment running status and alarms of each station through NM.

Support in-service load and upgrade of board software and NE software; supportremote load of board software and field programmable gate array (FPGA); supportmistake-proof load and follow-up transmission upon restoration.

Support remote maintenance function. In case of fault, the maintenance personnelcan maintain the equipment remotely through the public telephone network.

The PDH processing board provides pseudo-random binary sequence test tosupport remote BER test.

The service boards supports inloop and outloop of ports.

Provide the net

metro1000 system description e,v3.20

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