sj-20120320184105-001-unitrans zxmp s325 (v2.20) sdh based multi-service node equipment system...

ZXMP S325SDH Based Multi-Service Node Equipment

System Description

Version 2.20

ZTE CORPORATIONNO. 55, Hi-tech Road South, ShenZhen, P.R.ChinaPostcode: 518057Tel: +86-755-26771900Fax: +86-755-26770801URL: http://ensupport.zte.com.cnE-mail: [email protected]

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The ultimate right to interpret this product resides in ZTE CORPORATION.

Revision History

Revision No. Revision Date Revision Reason

R1.1 2012-07-30 Updated the documentation architecture.

R1.0 2012-03-30 ZXMP S325(V2.20) Issued.

Serial Number: SJ-20120320184105-001

Publishing Date: 2012-07-30(R1.1)

SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and Confidential

Table of ContentsAbout This Manual ......................................................................................... I

Chapter 1 Product Position and Features................................................ 1-11.1 Product Position................................................................................................. 1-1

1.2 Product Features................................................................................................ 1-2

Chapter 2 Product Architecture ................................................................ 2-12.1 Logical Structure ................................................................................................ 2-1

2.2 Hardware Structure ............................................................................................ 2-2

2.2.1 Subrack ................................................................................................... 2-3

2.2.2 Board Types ............................................................................................ 2-5

2.3 Software Architecture ....................................................................................... 2-10

2.3.1 Overview of Software Architecture........................................................... 2-10

2.3.2 Board Software ...................................................................................... 2-10

2.3.3 Agent Software ...................................................................................... 2-10

2.3.4 EMS Software.........................................................................................2-11

Chapter 3 Configuration and Networking ................................................ 3-13.1 Networking Modes.............................................................................................. 3-1

3.1.1 Point-to-Point Network.............................................................................. 3-1

3.1.2 Chain Network ......................................................................................... 3-2

3.1.3 Ring Network ........................................................................................... 3-3

3.1.4 DNI Network ............................................................................................ 3-5

3.2 Board Configurations in Subrack ......................................................................... 3-6

3.2.1 Board Description..................................................................................... 3-6

3.2.2 Board Configuration Description................................................................ 3-8

3.3 Typical NE Configurations................................................................................... 3-9

3.3.1 Terminal Multiplexer (TM).......................................................................... 3-9

3.3.2 Add/Drop Multiplexer (ADM) ................................................................... 3-10

3.3.3 Regenerator (REG) .................................................................................3-11

3.4 Networking Application of Multi-Service Node .................................................... 3-12

3.4.1 Networking via SFEx6 Board................................................................... 3-12

3.4.2 ATM Service Application ......................................................................... 3-15

3.4.3 RPR Service Networking ........................................................................ 3-16

3.5 Application Example ......................................................................................... 3-17

3.5.1 Service Requirements ............................................................................ 3-17

I


3.5.2 Networking Analysis ............................................................................... 3-18

3.5.3 Configurations........................................................................................ 3-19

3.5.4 Application Features............................................................................... 3-22

Glossary .......................................................................................................... I

II


About This ManualPurpose

This manual is applicable to the Unitrans ZXMP S325 SDH based multi-service nodeequipment.

Unitrans ZXMP S325 is a multi-service node equipment with the highest transmission rateof 2.5 Gbit/s. It can apply to the access network.

Intended Audience

This manual is intended for:

l Planning engineerl Maintenance engineer

What Is in This Manual

This manual contains the following chapters:

Chapter Summary

Chapter 1, Product Position and Features Describes the position and features of ZXMP S325.

Chapter 2, Product Architecture Describes the Logical architecture and hardware

architecture of ZXMP S325.

Chapter 3, Configuration and Networking Describes about networking modes and system

configurations of ZXMP S325.

Related Documentation

The following documentation is related to this manual:

l Unitrans ZXMP S325 (V2.20) SDH Based Multi-Service Node Equipment ProductDescription

l Unitrans ZXMP S325 (V2.20) SDH Based Multi-Service Node Equipment HardwareDescription

l Unitrans ZXMP S325 (V2.20) SDH Based Multi-Service Node Equipment InstallationManual

l Unitrans ZXMP S325 (V2.20) SDH Based Multi-Service Node EquipmentMaintenance Manual

l Unitrans ZXMP S325 (V2.20) SDH Based Multi-Service Node Equipment OperationInstructions

Conventions

This document uses the following typographical conventions.

I


Typeface Meaning

Italics Variables in commands. It may also refers to other related manuals and documents.

Bold Menus, menu options, function names, input fields, option button names, check boxes,

drop-down lists, dialog box names, window names, parameters and commands.

CAPS Keys on the keyboard and buttons on screens and company name.

Danger: Indicates an imminently hazardous situation, which if not avoided, will result in

death or serious injury.

Warning: Indicates a hazard that, if not avoided, could result in serious injuries,

equipment damages or interruptions of major services.

Caution: Indicates a potential hazard that, if not avoided, could result in moderate

injuries, equipment damages or partial service interruption.

Note: Provides additional information about a certain topic.

II


Chapter 1Product Position andFeaturesTable of Contents

Product Position .........................................................................................................1-1Product Features........................................................................................................1-2

1.1 Product PositionZXMP S325 is a ZTE Synchronous Digital Hierarchy (SDH) -based multiple service nodeequipment, with the highest rate of STM-16.

ZXMP S325 is used in the metropolitan area transmission network (at the access layer). Itsupports traditional SDH services and data services.Figure 1-1 illustrates the applicationof ZXMP S325.

Figure 1-1 ZXMP S325 Application in the Network

1-1


ZXMP S325 System Description

1.2 Product FeaturesMapping StructureThe ZXMP S325 supports the ETSI system and adopts the latest mapping structurespecified in ITU-T G.707 Recommendation, as shown in Figure 1-2.

Figure 1-2 ITU-T Mapping and Multiplexing Structure Adopted by ZXMP S325

Service Access CapabilityThe ZXMP S325 provides abundant service interfaces, including STM-4 or STM-1 opticalinterfaces, STM-1 electrical interface, E3/T3/E1/T1 PDH electrical interfaces, 10/100Mbit/s Ethernet interfaces, ATM interface, and RPR interface.

The ZXMP S325 employs a modular structure. Its hardware contains the cross-connect,clock, service, control, orderwire, and extension units. By combining different boards, theZXMP S325 can provide different functions.

Diversified Optical Interface FunctionsZXMP S325 supports the STM-1/4 single-fiber bidirectional application and the opticalmodule verification function.

The STM-1/4 single-fiber bidirectional application is implemented by OL1/4X4(four-channel STM-1/4 optical line) board. This application transmits the receive signaland the transmit signal in the same optical fiber, and thus saves optical fiber resource.

The optical module verification function detects if the optical module used by the equipmenthas passed verification. If not, service will be abnormal and EMS will report alarm. Onlyverified optical module can work normally.

Abundant Alarm FunctionsZXMP S325 supports visible and audible alarms.

Service board provides alarm indicator light to indicate if the board has alarm.

The equipment supports audible alarm. The ring-trip switch (marked as BELL-OFF on thefront panel) of NCP board or the cabinet ring-trip switch can control if the equipment willgive audible alarm when fault occurs to equipment.

1-2


Chapter 1 Product Position and Features

To facilitate fault locating and troubleshooting, the ZXMP S325 can detect time-divisioncross-connect alarm at AU level and TU level, such as AU-AIS, AU-LOP, HP-UNEQ,TU-AIS, and TU-LOP.

The ZXMP S325 also supports four channels of external alarm inputs and two channelsof alarm outputs.

TCM Function

TCM refers to Tandem Connection Monitoring.

OCS4 board and OCS16 board of ZXMP S325 support the HP-TCM (Higher-order PathTandem Connection Monitoring) function. This function can make it easy for variouscarriers to detect the number of B3 block errors received in their own networks and thenumber of B3 block errors transferred to next carriers network.

Orderwire Function

ZXMP S325 uses E1 or E2 overhead byte in SOH to provide orderwire phone.

Cross-Connect Capability

Configured with OCS16 board, ZXMP S325 can implement a high order cross-connectcapacity of 128128 VC-4, a lower order cross-connect capacity of 3232 VC-4, and asystem access capability of 9292 VC-4.

Configured with OCS4 board, ZXMP S325 can implement a high order cross-connectcapacity of 6464 VC-4, a lower order cross-connect capacity of 3232 VC-4, and a systemaccess capability of 3232 VC-4.

Equipment and Network Protection Capabilities

l 1+1 dual power supply protection system

The ZXMP S325 employs two power supply boards to implement the dual powersupply distribution system, which supports 1+1 power supply protection and ensuresthe equipment power security.

l 1+1 hot backup of critical board

The OCS4 board adopts the 1+1 hot backup to implement the backup of core boardin the system, and thus improves the system security.

l 1:N protection for service boards

The ZXMP S325 supports 1:N (N6) protection for E1/T1 service boards. It alsosupports 1:N (N5) protection for FE service board and E3/T3/STM-1 electrical serviceboards. The system can support at most two groups of 1:N protection. The 1:Nprotection improves reliability of system service processing.

l Distributed power supply for boards

1-3



Each board is fed in the distributed power supply mode. This eliminates the powersupply influence of one board upon another board, and greatly reduces the impact ofboard hot-plug upon the system.

l Network protection modes

The network protection functions of ZXMP S325 include 2-fiber bidirectional MSprotection ring, MS chain 1+1 protection, MS chain 1:1 protection, and subnetconnection protection (SNCP).

Timing and Synchronization Capability

ZXMP S325 can select the external clock, line clock, or internal clock as the system timingreference, which may work in the locked mode, hold mode, or free-oscillation mode. Thesystem supports setting ten line clocks and two external clocks at the same time.

ZXMP S325 supports synchronous priority switching and automatic switching basedon the SSM (Synchronization Status Message) algorithm. In complicated transmissionnetwork, the automatic switching based on SSM can optimize timing and synchronizationdistribution of the network, reduce difficulty in synchronization planning, prevent timingloops, and keep the network synchronization in an optimal status.

Network Management Capability

ZXMP S325 adopts the NetNumen U31 R22 EMS, which can manage various equipmentswith perfect management functions. It has a friendly graphic man-machine interactiveinterface, ensuring easy operations.

1-4


Chapter 2Product ArchitectureTable of Contents

Logical Structure ........................................................................................................2-1Hardware Structure ....................................................................................................2-2Software Architecture ...............................................................................................2-10

2.1 Logical StructureThe logical structure of ZXMP S325 consists of the NE control platform, clock processingplatform, service cross-connect platform, overhead processing platform, power supplysupport platform, and service access platform.

The relationships of all the platforms are shown in Figure 2-1.Table 2-1 lists the platformfunctions.

Figure 2-1 The Relationships of the Platforms

Table 2-1 Platform Functions

Name Function

NE control

platform

As the interface between the NE equipment and background EMS, the NE

control platform is the agent for other platforms to receive or report network

management information.

Power supply

support platform

With the distributed power supply mode, power supply modules in each board

provide the power supply for the corresponding boards.

2-1



Name Function

Service access

platform

Supports accessing SDH, PDH, Ethernet, and ATM services.

And it converts the accessed services to corresponding formats, and then it

forwards them to the service cross-connect platform for convergence and

distribution.

Overhead

processing

platform

Provides the orderwire voice channel and several assistant data channels

through section overhead (SOH) bytes while transmitting payloads.

Clock processing

platform

As one of the core parts of the hardware system, this platform provides the

system clock for all platforms in the equipment.

Service cross-

connect platform

Implements the convergence, distribution and switching for service signals

and other information received from the service access platform and overhead

processing platform.

2.2 Hardware StructureZXMPS325 subrack has a small size and is only 5U high. It can be installed on the desktop,hung on the wall or, inside an indoor cabinet, an outdoor cabinet or a field power supplycabinet. The subrack can also be installed in IEC standard or ETS standard cabinets withproper mounting flanges.

Figure 2-2 shows the schematic diagram of ZXMP S325 subrack.

Figure 2-2 Schematic Diagram of ZXMP S325 Subrack

Two types of cabinet with different heights are provided for the ZXMP S325: 2000 mm and2200 mm. These cabinets are all 300 mm deep.

Each type of cabinet can hold one to four subracks.

2-2


Chapter 2 Product Architecture

2.2.1 Subrack

Overview

Following points state subrack details:

l Comprises side panels, beams and metal guide rails, with heat dissipation andelectromagnetic shielding functions.

l User can fix subrack in the cabinet from the front without obstructing cable layout.l The installation mode can meet the requirements of maintenance from the equipment

front, cabinet installation against wall, and back-to-back installation.

Subrack Structure

Figure 2-3 illustrates the subrack structure.

Figure 2-3 Subrack Structure

1. Top cabling area2. Service/functional interface

board area3. Small door4. Power cable outlet

5. Power supply board area6. Dustproof unit7. Bottom cabling area8. Service/functional board

area

9. Cable outlet10. Grounding post11. Mounting lug12. Captive fastener13. Fan unit

Subrack Parts

For the brief descriptions of different subrack parts, refer to Table 2-2.

Table 2-2 Brief Descriptions of Different Subrack Parts

S.N. Name Position in the Subrack Brief Description

1 Top cabling areaOn top of the subrack interface

board area

For leading out service cables

and fiber pigtails of the interface

board area. It can be opened

upward.

2-3




2Service/functional interface

board area

In the upper left part of the sub-

rack

The system interface board

(SAI) and the service interface

boards are inserted in this area.

This area has one slot for the

system interface board, and

six slots for service interface

boards. The board slots are ar-

ranged as in Figure 20.

3 Small door On the left side of the subrack

For the purposes of decoration,

ventilation, and shielding. It is

detachable.

4 Power cable outletAt the bottom of the subrack left

panel.For leading out the power cable.

5 Power supply board areaIn the bottom left part of the

subrack

To insert the power supply

board

6 Dustproof unitAt the bottom of the service/

functional board area

Keep the subrack inside clean,

thus ensuring heat dissipation

performance

7 Bottom cabling areaAt the bottom of the subrack and

above the dustproof unit

For laying service cables and

fiber pigtails of the service/func-

tional board area

8 Service/Functional board area At the right side of the subrack

To insert the functional/service

boards. It has 11 slots, with a

25.4 mm gap between neigh-

boring slots. The board slots

are arranged as in Figure 20.

9 Cable outletAt the bottom of the subrack

right panel

For leading out service cables

and fiber pigtails of the ser-

vice/functional board area.

10 Grounding postAt the bottom of the subrack

right panel

For connecting the subrack pro-

tection ground cable.

11 Mounting lugAt the back of the subrack (one

each on the left and the right)

For fixing a subrack in the cabi-

net

12 Captive fastener On the mounting lugFor fixing a subrack in the cabi-

net

2-4




13 Fan unit On top of the subrack right side

It provides forced air cooling for

the equipment to dissipate heat.

The fan unit has two indepen-

dent fan boxes, each of which

is connected to the fan moth-

erboard (FMB) for the conve-

nience of maintenance.

Board SlotsFor the board slot arrangement of ZXMP S325 subrack, see Figure 2-4.

Figure 2-4 Board Slots of ZXMP S325 Subrack

l In Figure 2-4, the slots numbered from 1 to 8 and 11, 12, 17 are for service/functionalboards; and the slots numbered from L1 to L6 are for interface boards.

l The subrack board area is divided into four sub-areas:

Service/functional interface board area: locates in the upper left part of subrack

Power supply board area: locates in the bottom left part of subrack

Fan unit area: locates in the upper right area of subrack

Service/functional board area: locates in the bottom right part of subrack

2.2.2 Board TypesTable 2-3 lists the functions of ZXMP S325 boards .

Table 2-3 ZXMP S325 Board List

Board ID Board Name Description

MB Motherboard It is the carrier for various boards, communicates with boards,

other equipment, and the external via the sockets.

NCP NE control processor Provides the NE management, and ECC protocol processing.

2-5




SAIA System auxiliary

interface board (type A)

SAIB System auxiliary

interface board (type B)

l provide the NCP board with the alarm input and output

interfaces, alarm concatenation interface and F1 interface.

l provide the OCS4/OCS16 board with external clock input

and output interfaces.

PWRA Power supply board l Processes the imported -48 V DC power, and provides it

to the subrack.

l Supports 1+1 hot backup of PWRA board.

l Can prevent reverse connection of power supply, and

detects over/under-voltage and board-in-position signals.

PWRB Power supply board l Processes the imported +24 V DC power, and provides it

to the subrack.

l Supports 1+1 hot backup of PWRB board.

l Prevents reverse connection of power supply, and detects

over/under-voltage and board-in-position signals.

OCS4 STM-1/4 optical line,

cross-connect, and

synchronous-clock

board

It processes the STM-1/STM-4 optical line, cross-connects the

higher/lower-order paths, and allocates the clock.

OCS16 STM-16 optical line,

cross-connect, and syn-

chronous-clock board

It processes the STM-16 optical line, cross-connects the

higher/lower-order paths, and allocates the clock.

LP1x1 1-channel STM-1 line

processor

LP1x2

2-channel STM-1 line

processor

l Can process 1 or 2 channels of STM-1 interface.

l Forwards EMS information from optical line to NCP board,

and outputs the received reference clock to OCS4/OCS16

board.

l Works with the electrical interface board to access STM-1

electrical interface, and implements the asynchronous

mapping/demapping of electrical signals.

l Works with the electrical interface switching board ESS1

and bridge interface board BIS1 to implement 1:N (N5)

protection for STM-1 electrical interface.

l Works with the optical interface board OIS1 to access

the STM-1 optical interface; implements the conversion

between optical signal and electrical signal; and separates

data from overhead.

2-6




LP4x1 1-channel STM-4 line

processor

LP4x2

2-channel STM-4 line

processor

l Can process one or two channels of STM-4 interface.

l Forwards EMS information from optical line to NCP board,

and outputs the received reference clock to OCS4/OCS16

board.

l Works with the optical interface board OIS4 to access

the STM-4 optical interface; implements the conversion

between optical signal and electrical signal; and separates

data from overhead.

OL1/4x4 4-channel STM-

1/STM-4 optical line

board

Can process four channels of STM-1 or STM-4 optical signals.

OL16x1 1-channel STM-16 opti-

cal line board

Provides one pair of STM-16 standard optical transmit/receive

interfaces, supports color optical interface.

OIS1x1 1-channel STM-1 opti-

cal interface board

OIS1x22-channel STM-1 opti-

cal interface board

l OISx1 board provides one STM-1 optical receive interface

and one STM-1 optical transmit interface.

l OIS1x2 board provides two STM-1 optical receive

interfaces and two STM-1 optical transmit interfaces.

l The optical transmit interface can automatically shut

down the laser.


cal interface board

OIS1x6 6-channel STM-1

optical interface board

l At the transmit side, it converts the electrical signal into

optical signal.

l The optical transmit interfaces can shut down the laser

automatically.


cal interface board

OIS4x22-channel STM-4 opti-

cal interface board

l OIS4x1 board provides one STM-4 optical receive

interface and one STM-4 optical transmit interface.

l OIS4x2 board provides two STM-4 optical receive

interface and two STM-4 optical transmit interface.

l The optical transmit interface can automatically shut

down the laser.

BIS1

STM-1 bridge interface

board

l Used when the 1:N (N5) protection for tributary board

is required, and inserted in service interface board slot

corresponding to the protection board.

l According to the protection control signal from

OCS4/OCS16 board, the BIS1 board functions as a

bridge between the protection LP1x1/LP1x2 board and

the ESS1x2 board corresponding to the faulty board.

2-7




ESS1x2

2-channel STM-1 elec-

trical interface switching

board

l Provides two STM-1 electrical interface pairs for

LP1x1/LP1x2 board.

l When the 1:N (N5) protection for tributary board is not

required, ESS1x2 board only performs STM-1 electrical

interface function. When the 1:N (N5) protection for

tributary board is required, the ESS1x2 board works with

the BIS1 board to implement the 1:N (N5) protection for

tributary board.

EPE1x21

7521-channel E1 electrical

processor (75 )

EPE1x21


processor (120 )

EPT1x21

10021-channel T1 electrical

processor (100 )

EPE1B 21-channel E1/T1

electrical processor

l Maps and demaps E1 or T1 electrical signals.

l The timeslots to add service and the timeslots to drop

service can be different.

l Extracts and inserts higher-order/lower-order path

overheads.

l Supports tributary retiming of at most four tributaries (the

first to the fourth E1/T1 tributaries).

BIE1x21 21-channel E1/T1

bridge interface board

Serves for the 1:N board tributary protection of E1/T1 electrical

signal. It distributes and transfers electrical signals coming

from working board to the protection boards.

ESE1x21


interface switching

board (75 )

ESE1x21

12021-channel E1/T1

electrical interface

switching board

l Provides twenty-one E1/T1 electrical interface pairs for

EPE1x21/EPT1x21/EPE1B board.

l When the protection for tributary board is not required,

ESE1x21 board only performs E1/T1 electrical interface

function. When the 1:N (N5) protection for tributary

board is required, ESE1x21 board works with the BIE1x21

board to implement the 1:N (N5) protection for tributary

board.

EP3x3 3-channel E3/T3

electrical processor

Processes three channels of E3 or T3 services. Its port rate

can be configured as E3 or T3 via the EMS.

BIE3x3 3-channel E3/T3

electrical bridge

interface board

Serves for the 1:N board tributary protection of

E3/T3/FE/STM-1 electrical signal. It distributes and transfers

electrical signals coming from working board to the protection

board.

2-8




ESE3x3 3-channel E3/T3

electrical interface

switching board

l Provides three E3/T3 electrical interface pairs for EP3x3

board.

l When the protection for tributary board is not required,

ESE3x3 board only performs E3/T3 electrical interface

function. When the 1:N (N5) protection for tributary

board is required, ESE3x3 board works with the BIE3x3

board to implement the 1:N (N5) protection for tributary

board.

SFEx6 Smart fast Ethernet

board

It implements the switching, mapping, and demapping

between Ethernet interfaces.

SED Enhanced smart

Ethernet board

Works with interface boards; maximally supports eight FE and

two GE Ethernet user ports from the user side to process ten

channels of Ethernet services.

TFEx8 8-channel transparent

board of fast Ethernet

Supports eight VCG ports maximally, provides the 8-channel

Ethernet EOS transparent transmission.

EIFEx4 4-channel electrical in-

terface board of fast

Ethernet

EIFEx6 6-channel electrical

interface board of fast

Ethernet

l Provide four/six Ethernet physical electrical interfaces.

l Process the Ethernet electrical services.

l When the EIFEx4 board cooperates with the SFEx6

board, the Ethernet electrical services support the 1:N

(N5) protection function.

EITFEx6 6-channel switching

board of smart and fast

Ethernet

l Provides six Ethernet physical electrical interfaces.

l Processes the Ethernet electrical services.

l When the EITFEx6 board cooperates with the TFEx8 or

SED board, the Ethernet electrical services support the

1:N (N5) protection function.

BIFE Bridge interface board

of fast Ethernet

BIFE board is used only when 1:N (N5) protection for

Ethernet electrical services is required. It is inserted into the

corresponding slot of the protection board.

AP1x4 ATM processor with 4

STM-1 ports

Accesses and processes four channels of ATM services.

RSEB

Ethernet processor with

RPR function

l Processes two channels of GE and four channels of FE

services.

l The board provides two channels of GE optical/electrical

interfaces. The FE interface is provides by OIS1x4 board

or ESFEx4 board.

l Supports processing the RPR service.

OA Optical amplifier Implements the amplification of optical signals.

2-9



2.3 Software Architecture

2.3.1 Overview of Software ArchitectureThe system software of ZXMP S325 comprises board software, Agent and EMS, which runon each board, NE control processor board and EMS computer respectively. It implementsthe management and control of boards, NEs and the whole network.

The ZXMP S325 software adopts layered structure design with each layer implementingspecific function and providing service to the upper layer. The software structure is shownin Figure 2-5.

Figure 2-5 Software Structure of ZXMP S325

2.3.2 Board SoftwareThe board software runs in each board to manage, supervise, and control the boardoperation.

Each board receives EMS commands forwarded by the Agent in the NE control processorboard, and then performs corresponding processing, gives responses and reports alarm,performance and event information to the EMS.

The board software has the following functions: alarm, performance and event processing,configuration management, communication management, automatic protection switching,online software downloading, and functional circuit driving.

2.3.3 Agent SoftwareAgent, located on the NE control processor board of an NE, acts as a service unit thatsupports the communication between an EMS and the boards in an NE. It allows the EMSto monitor, control and manage the NE. In summary, an Agent has the following functions:

l Configure each board during initialization after the NE is powered on.l Monitor alarms and performances of the normally-running NE, receive monitoring and

configuration commands issued by the EMS from the gateway NE in its network andreport processing results, alarms and performances via the ECC interface.

2-10



The gateway NE is connected to the EMS through the Qx interface on the systeminterface board. The LCT interface of the NE control processor board can also beused to connect the Agent to an EMS. NEs can be managed by means of commandlines.

In terms of function, Agent is composed of the following modules.

l Embedded Operating System Platform

This platform is responsible for the management of public resources. It provides ahardware-independent execution environment for applications.

l Communication and Control Module

This module acts as an interface module supporting the information exchangebetween the Agent and the other board software in an NE. It issues maintenance oroperation commands to corresponding boards from the Agent.

At the same time, this module collects status, alarm, performance and eventinformation of each board and reports it to the Agent.

l Equipment Management Module

This module is a critical part of Agent to implement the management of correspondingNE, through which the Agent issues network management commands.

l Communications Module

This module supports the exchange of management information between an EMSand an NE, and that between two NEs.

l Database Management Module

This module manages and accesses alarm, performance, event, equipment andnetwork information collected by Agent.

2.3.4 EMS SoftwareThe EMS software NetNumen U31 R22, NetNumen T31 and ZXONM E300 can be usedto manage and monitor the ZXMP S325 NEs.

They provide the functions of configuration management, fault management, performancemanagement, maintenance management, end-to-end circuit management, securitymanagement, system management, and report management.

Figure 2-6 illustrates the architecture of the EMS software.

2-11



Figure 2-6 Architecture of the EMS Software

l Manager

It is also called "Server". Manager acts as the server of GUI. It exchanges informationwith Agent via the Qx interface. Manager provides the following functions.

Receive requests fromGUI, analyze the requests and forward related informationto Agent or send the information to Database.

Receive processed information from the database, analyze the information andforward it to GUI.

Receive the information from Agent, analyze the information and then forward itto Database or GUI.

l GUI

It is also called "Client". GUI has the following functions.

Provide graphical user interface for users.

Provide service interfaces for configuration management, fault management,performance management, security management, maintenance management,system management and online help.

Support user security control.

l Database

Database provides the following functions.

Support the query of information of interfaces and management functionalmodules.

Store the configuration information, alarm information, etc.

Keep data consistency between Database and Agent.

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Chapter 3Configuration andNetworkingTable of Contents

Networking Modes......................................................................................................3-1Board Configurations in Subrack ................................................................................3-6Typical NE Configurations ..........................................................................................3-9Networking Application of Multi-Service Node ..........................................................3-12Application Example.................................................................................................3-17

3.1 Networking Modes

3.1.1 Point-to-Point NetworkThe point-to-point network constructed with ZXMP S325 supports aggregate rates ofSTM-1 and STM-4.

It is applicable to large-capacity inter-office trunk and inter-office expansion.

Two ZXMP S325 terminal multiplexers (TM) can build a point-to-point network with 1+1protection or with no protection.

l 1+1 protection mode

Under the 1+1 protection mode, two aggregate boards protect each other.

This mode enhances the reliability of service transmission.

However, it will decrease the service access capability.

l Non-protection mode

Under the non-protection mode, the service access capability is improved.

However, the transmission reliability may not be guaranteed.

There is no protection for a single ZXMP S325 TM.

Figure 3-1 illustrates the typical point-to-point networks.

3-1



Figure 3-1 Point-to-Point Networking of ZXMP S325

3.1.2 Chain NetworkThe chain network consists of TM and ADM (Add/Drop Multiplexer) equipment.

The chain network with the application of ZXMP S325 equipment supports aggregate ratesof STM-1 and STM-4.

It is applicable to long-haul backbone network, communication network whose traffic isdistributed in a chain manner, and chain branch network of a ring network.

Two ZXMP S325 TMs and ADM can build a chain with 1+1 protection or with no protection.

l 1+1 protection mode

Under the 1+1 protection mode, two aggregate boards protect each other.

This mode enhances the reliability of service transmission.

However, it will decrease the service access capability.

l Non-protection mode

Under the non-protection mode, the networking of dual-ADM and dual-TM canimprove the service access capabilities.

However, it will reduce the reliability of service transmission.

A single ZXMP S325 TM and ADM build a chain network with no protection.

Figure 3-2 illustrates the typical chain networks.

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Chapter 3 Configuration and Networking

Figure 3-2 Chain Networking of the ZXMP S325

3.1.3 Ring NetworkLine interfaces of the ring network feature self-closure. The tributary services between NEscan be transmitted from end to end in two directions (east and west). This kind of networktopology has a strong adaptability and self-healing capability, applicable to large-capacityoptical networks.

There are two types of self-healing ring structures: path protection ring and MS protectionring. From the view of the abstract functional structure, the path protection ring and MSprotection ring respectively belongs to the sub-network connection protection and pathprotection.

ZXMP S325 can form the following ring networks:

l 2-fiber path protection ring at STM-4 and STM-16 levels.l 2-fiber bidirectional MS protection ring network at STM-1, STM-4, and STM-16 levels.

Figure 3-3 shows a ring network consisting of ZXMP S325.

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Figure 3-3 Ring Networking of ZXMP S325

2-fiber Path Protection RingZXMP S325 can constitute 2-fiber path protection ring at STM-1, STM-4, and STM-16levels.

Figure 3-4 illustrates the configuration at a single node.

Figure 3-4 Configuration of 2-Fiber Path Protection Ring of ZXMP S325

As shown in Figure 3-4 , the working path and the protection path are located in two opticaltransmission aggregates in opposite directions. Their timeslots are configured in the EMS.

l Advantages of path protection ring

It features fast and flexible protection switching and capability to provide switchingat various capacity levels. The switching is determined by the receive NE, and isindependent of the network topology.

It is applicable to various complex network topologies and is not confined to the ringtopology. Therefore, it is more applicable to dynamic network environments, such ascellular telecommunication network.

l Disadvantages of path protection ring

All the tributary signals adopt concurrent transmission and preferred reception. Thatmeans all the tributary signals are transmitted to the receive NE in two directions alongthe whole ring. Therefore, the total add and drop traffic of all NEs (traffic of the ring)is less than or equal to the system capacity of ADM NE.

3-4



l It is applicable to the access networks, trunk networks, and toll networks, where thetraffic is centralized and the capacity is relatively small.

2-fiber Bidirectional MS Protection Ring

The ZXMP S325 can form 2-fiber bidirectional MS protection ring at STM-4 and STM-16levels.

The maximum capacity of a 2-fiber bidirectional MS protection ring can reach up to(K/2)STM-N, where K is the number of nodes in the ring, and STM-N is the highestrate of the ring. With extra service, its capacity can reach up to KSTM-N.

Advantages of MS protection ring: large transmission capacity and flexible switching.

Disadvantages of MS switching ring: fault response/recovery time is relatively long due tothe APS protocol to be processed.

It is applicable to the large-capacity transmission at STM-16 and STM-4 levels, trunknetworks and toll networks with dispersed traffic.

3.1.4 DNI NetworkThe Dual Node Interconnection (DNI) network consists of two interconnected ringnetworks. The interconnected ring networks can provide protection for inter-ring traffic.The two ring networks, e.g. two interconnected path rings, can be configured with thesame protection type. The two ring networks, e.g. a path ring interconnected with a MSring, can be configured with different protection types.

The rate of ZXMP S325 DNI networking is determined by the rate of the ring networks.The DNI network generally works at the rate of STM-16.

The DNI networking provides protections for multiple paths and key nodes. It is applicableto the local transmission backbone network.

Figure 3-5 illustrates a DNI networking of ZXMP S325.

Figure 3-5 DNI Networking of ZXMP S325

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3.2 Board Configurations in Subrack

3.2.1 Board DescriptionThe boards of ZXMP S325 fall into four categories based on their functions: functionalboards, functional interface boards, service boards, and service interface boards.

l The functional and functional interface boards of ZXMP S325 include: NCP (NEcontrol processor), OCS16 (STM-16 optical line, cross-connect, and synchronousclock board), OCS4 (STM-4 optical line, cross-connect, and synchronous clockboard), PWRA (power supply board), and SAIA/SAIB (system auxiliary boardinterface board).

l The service boards and service interface boards of ZXMP S325 include: Serviceboards, interface boards, interface switching boards, and bridge interface boards.Different services can be implemented with different combinations of these serviceand service interface boards.

Table 3-1 lists the service types and corresponding service/service interface boardcombinations.

Table 3-1 Service Types and Corresponding Service/Service Interface BoardCombinations of ZXMP S325

Service/Service Interface Boards NeededService Type

Type Board ID

STM-16 optical service Service board OCS16 or OL16x1

STM-4 optical service Service board OCS4

STM-1/4 optical service Service board OL1/4x4

Service board LP4x1 or LP4x2STM-4 optical service

Interface board OIS4x1 or OIS4x2

Service board LP1x1 or LP1x2STM-1 optical service


Service board LP1x1 or LP1x2STM-1 electrical service

Interface switching board ESS1x2

Service board LP1x1 or LP1x2

Interface bridge board BIS1

STM-1 electrical service with

1:N (N5) protection

Interface switching board ESS1x2

Service board EPE1x21 or EPE1BE1 service

Interface switching board ESE1x21

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Type Board ID

Service board EPE1x21 or EPE1B

Interface bridge board BIE1x21

E1 service with 1:N (N6)

protection


Service board EPT1x21 or EPE1BT1 service


Service board EPT1x21 or EPE1B

Interface bridge board BIE1x21

T1 service with 1:N (N5)

protection


Service board EP3x3E3 service


Service board EP3x3

Interface bridge board BIE3

E3 service with 1:N (N5)

protection


Service board EP3x3T3 service


Service board EP3x3

Interface bridge board BIE3

T3 service with 1:N (N5)

protection


Service board SFEx6 or SED or TFEx8 or

RSEB

100 M Ethernet electrical

service

Interface board EIFEx4 or EIFEx6

Service board SFEx6 or TFEx8 or SED

Interface bridge board BIFE

100MEthernet electrical service

with 1:N (N5) protection

Interface board EIFEx4 or EITFEx6

Service board SFEx6 or SED or TFEx8 or

RSEB

100 M Ethernet optical service


100 M Ethernet optical service Service board SED

100 M Ethernet electrical

service

Service board SED

Service board AP1x4ATM service

Interface board OIS1x4

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Type Board ID

Service board RSEBRPR service (FE electrical

interface, GE optical interface) Interface board EIFEx4

Service board RSEBRPR service (FE optical

interface, GE optical interface) Interface board OIS1x4

OCS16 board, OCS4 board, and OL1/4x4 board do not have interface board, since they have opticalinterface on their own front panels.

The interface switching board can serve as interface board for service which has no protection. The rate of OL1/4x4 board optical interfaces can be configured to be STM-1 or STM-4. To configure

the rate, install STM-1 or STM-4 optical module and configure it in EMS. There are two GE optical interfaces and two FE optical interfaces on the SED panel to access Ether

net services.

3.2.2 Board Configuration DescriptionIn ZXMP S325 system, the components are divided into two categories: mandatorycomponents and optional components.

Mandatory Components

l Motherboard (MB): it is the basis of the system. Each subrack must have one MB.Other functional boards are inserted into the motherboard.

l NCP board: it is the core of the system management. Each subrack must beconfigured with one NCP board.

l OCS4 or OCS16 board: it provides the working clock for the whole system. Eachsubrack should be configured with at least one OCS4 or OCS16 board. Two OCS4or OCS 16 boards should be configured if 1+1 hot backup is needed.

l PWRA board: it supplies power to the system. Each subrack should be configuredwith one PWRA board. Two PWRA boards should be configured if 1+1 hot backup isneeded.

l SAIA or SAIB board: it provides the system with external clock input/output, alarminput/output, and subrack alarm concatenation.

Optional Components

l The service boards and their interface boards are optional. Select the type andquantity of service board according to actual service needs. However, the capacityof service boards selected should not exceed the maximum capacity of the system.

The system provides STM-4/STM-1 optical interfaces, E1/T1/E3/T3 PDH electricalinterfaces, STM-1 electrical interfaces, and FE/ATM interfaces.

l Select and configure OA board as per the attenuation compensate value and theengineering requirements.

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3.3 Typical NE ConfigurationsWith modular design employed, the ZXMP S325 can perform functions of TM, ADM,and REG in the same hardware system without changing hardware (boards) but only bymodifying the configurations in the EMS.

The equipment types and their applications in the network are illustrated in Figure 3-6.

Figure 3-6 ZXMP S325 Application in Network

3.3.1 Terminal Multiplexer (TM)The Terminal Multiplexer (TM) equipment comprises optical line board, tributary board,and corresponding functional boards. The SDH overhead is terminated at the optical lineboard side and is not transmitted forward.

TM Equipment Configuration

l Install OCS4/OCS16, PWRA/PWRB, NCP, and SAIA/SAIB boards which aremandatory.

l Determine the type of optical line boards to be used in the TM equipment accordingto the rate and quantity of the aggregate optical direction.

l For TM equipment at STM-16 level, if the OCS16 board configured can provideSTM-16 optical interface, OL16x1 board is optional. Otherwise, one OL16x1 board ismandatory. Other boards can be configured as required, such as EP3x3, EPE1x21,EPT1x21, EPE1B, SFEx6, TFEx8, SED, AP1x4, and RSEB board.

l For TM equipment at STM-4 level, if the OCS4 board configured can provide STM-4optical interface, LP4x1, LP4x2, or OL1/4x4 board is optional. Otherwise, one LP4x1board, or one LP4x2 board, or one OL1/4x4 board is mandatory. Other boards can beconfigured as required, such as EP3x3, EPE1x21, EPT1x21, EPE1B, SFEx6, TFEx8,SED, AP1x4, and RSEB board.

l For TM equipment at STM-1 level, if the OCS4 board configured can provide STM-1optical interface, LP1x1, LP1x2, or OL1/4x4 board is optional. Otherwise, one LP1x1board, or one LP1x2, or one OL1/4x4 board is mandatory. Other boards can beconfigured as required, such as EP3x3, EPE1x21, EPT1x21, EPE1B, SFEx6, TFEx8,SED, AP1x4, and RSEB board.

3-9



l Choose the interface boards, bridge interface boards, and interface switching boardsaccording to the service type and service boards used.

Typical TM Equipment Configuration Example

Figure 3-7 illustrates the configurations of TM equipment at STM-4 level.

Figure 3-7 Configurations of TM Equipment at STM-4 Level

3.3.2 Add/Drop Multiplexer (ADM)The Add/DropMultiplexer (ADM) equipment comprises two or more optical line boards withthe same rate, tributary boards, and corresponding functional boards. The SDH sectionoverhead terminates at the receive side of one optical direction and is added again at thetransmit side of the same optical direction.

ADM Equipment Configuration

l Install OCS16/OCS4, PWRA/PRWB, NCP, and SAIA/SAIB boards which aremandatory.

l Determine the type of optical line boards to be used in the ADM equipment accordingto the aggregate rate and quantity of the aggregate optical direction.

l For ADM equipment at STM-16 level, if two OCS16 boards are configured and bothcan provide STM-16 optical interface, OL16x1 board is optional. Otherwise, twoOL16x1 boards are mandatory. Other boards can be configured as required, such asEP3x3, EPE1x21, EPT1x21, EPE1B, SFEx6, TFEx8, SED, AP1x4, and RSEB board.

l For ADM equipment at STM-4 level, if two OCS4 boards are configured and bothcan provide STM-4 optical interface, LP4x1, LP4x2, or OL1/4x4 board is optional;otherwise, two LP4x1 boards, or two LP4x2 board, or two OL1/4x4 boards eachof which has one STM-4 optical interface pair are mandatory. If OCS16 board isconfigured, two LP4x1 boards, or one LP4x2 board, or one OL1/4x4 board withtwo STM-4 optical interface pairs is mandatory. Other boards can be configured asrequired, such as EP3x3, EPE1x21, EPT1x21, EPE1B, SFEx6, TFEx8, SED, AP1x4,and RSEB board.

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l For ADM equipment at STM-1 level, if two OCS4 boards are configured and bothcan provide STM-1 optical interface, LP1x1, LP1x2, or OL1/4x4 board is optional;otherwise, two LP1x1 boards, or one LP1x2 board, or one OL1/4x4 board with twoSTM-1 optical interface pairs is mandatory. If OCS16 board is configured, two LP1x1boards, or one LP1x2 board, or one OL1/4x4 board with two STM-1 optical interfacepairs is mandatory. Other boards can be configured as required, such as EP3x3,EPE1x21, EPT1x21, EPE1B, SFEx6, TFEx8, SED, AP1x4, and RSEB board.

l The ADM equipment at STM-1 or STM-4 level can perform path protection.l Choose interface boards, bridge interface boards, and interface switching boards

according to the service type and service boards used.

Typical ADM Equipment Configuration Example

Figure 3-8 illustrates the configurations of ADM equipment at STM-4 level.

Figure 3-8 Configurations of ADM Equipment at STM-4 Level

3.3.3 Regenerator (REG)The REG equipment comprises optical line boards and corresponding functional boards.It receives line optical signal, regenerates the signal, and forwards the signal to the nextoptical line.

REG Equipment Configuration

l Install the OCS16/OCS4, PWRA, NCP, and SAIA/SAIB boards which are mandatory.l Determine the type of optical line boards to be used in the REG equipment according

to the aggregate rate and quantity of the aggregate optical direction.l For REG equipment at STM-16 level, if two OCS16 boards are configured and both

can provide STM-16 optical interface, OL16x1 board is optional. Otherwise, twoOL16x1 boards are mandatory.

l For REG equipment at STM-4 level, if two OCS4 boards are configured and bothcan provide STM-4 optical interface, LP4x1, LP4x2, or OL1/4x4 board is optional;otherwise, two LP4x1 boards, or two LP4x2 board, or two OL1/4x4 boards eachof which has one STM-4 optical interface pair are mandatory. If OCS16 board is

3-11



configured, two LP4x1 boards, or one LP4x2 board, or one OL1/4x4 board with twoSTM-4 optical interface pairs is mandatory.

l For REG equipment at STM-1 level, if two OCS4 boards are configured and bothcan provide STM-1 optical interface, LP1x1, LP1x2, or OL1/4x4 board is optional;otherwise, two LP1x1 boards, or one LP1x2 board, or one OL1/4x4 board with twoSTM-1 optical interface pairs is mandatory. If OCS16 board is configured, two LP1x1boards, or one LP1x2 board, or one OL1/4x4 board with two STM-1 optical interfacepairs is mandatory.

l Choose interface boards or interface switching boards according to service boardsused.

Typical REG Equipment Configuration Example

Figure 3-9 illustrates the configurations of REG equipment at STM-4 level.

Figure 3-9 Configurations of REG Equipment at STM-4 Level

3.4 Networking Application of Multi-Service Node

3.4.1 Networking via SFEx6 BoardWhen the ZXMP S325 equipment is configured with SFEx6 or SED board, it has highlyintegrated ports and the function of Ethernet L2 switching, with powerful networkingcapability.

Typical networking modes include: chain network, tree network, ring network, and meshnetwork.

Chain Network

Chain network is the basic networking mode using the smart Ethernet board, as shown inFigure 3-10.

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Figure 3-10 Chain Network Configuration

Chain network can perform basic switching of Ethernet service, and send the non-VLANand VLAN service of user Ethernet to the configured port.

In order to handle path congestion, flow control or QoS function can be enabled. QoS andflow control aim at different purposes, restricting each other and cannot coexist.

The main purpose of flow control is to avoid packet loss during congestion. Whencongestion occurs, enable the flow control option of the system ports of SFEx6 boardsat the two ends.

QoS is another way to handle congestion. It can guarantee multiple unrelated servicesto work at the same port according to configurations, and thus make the best use of theport resource and work without interference with each other. In a chain network, if multipleVLAN services share one limited bandwidth link, enable the QoS function at all the relatedports and complete the related configurations.

Tree Network

Figure 3-11 shows a tree network formed by smart Ethernet boards.

Figure 3-11 Tree Network Application

Tree network is similar to chain network. It can perform the switching of Ethernet services.Path congestion can be handled by enabling the flow control or QoS function.

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In Figure 3-11, suppose the three system ports of SFEx6 board 1 respectively have serviceconnections with the system port of SFEx6 board 2, SFEx6 board 3, and SFEx6 board 4.When the total traffic of all the system ports of SFEx6 boards is less than 100Mbit/s, enablethe flow control option at the six system ports of SFEx6 boards to prevent packet loss.

Suppose the traffic to SFEx6 board 2, SFEx6 board 3, and SFEx6 board 4 is sent throughthe same system port of SFEx6 board 1, when the total traffic at this system port of SFEx6board 1 is greater than 100 Mbit/s, the QoS function of the system port must be enabledto handle the congestion; configure the service priorities and assign the bandwidth;meanwhile, enable the QoS function for all the related user ports and set priorities forQoS.

Ring Network

Figure 3-12 shows a ring network formed by smart Ethernet boards.

Figure 3-12 Ring Network Application

Ring network can perform the switching of Ethernet services. In addition, it is necessary toconfigure the spanning tree protocol of virtual bridge in order to avoid traffic loop. A virtualbridge is generated when a smart Ethernet board is included in a VLAN.

The spanning tree protocol aims to enable the bridge to dynamically find a topology whichis a subnet (tree) without loop, so as to guarantee the maximum connectivity of the networkand to avoid the broadcast storm resulted from loop. Data will only be transmitted andreceived between the valid ports of the spanning tree, and will not be sent to any portwhich is not in the spanning tree.

Apply the flow control or QoS to handle path congestion.

Mesh Network

Figure 3-13 shows a mesh network formed by smart Ethernet boards.

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Figure 3-13 Mesh Network Application

The application of mesh network is similar to the ring network. Refer to Ring Networksection for details.

3.4.2 ATM Service ApplicationConfigured with AP1x4 board, the ZXMP S325 has the ATM data process function of MAN(Metropolitan Area Network) equipment.

At the ATM side, the AP1x4 board offers four 155 Mbit/s optical interfaces for accessingATM service. It can perform local switching at VP/VC level via its switching module.

At the system side, the AP1x4 board offers four 155 Mbit/s system interfaces thatcan enable long-haul transmission of ATM service over the SDH optical network afterconfiguration in the EMS.

Figure 3-14 shows a typical networking application using AP1x4 boards.

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Figure 3-14 Networking Application via AP1x4 Boards

l ATM service access

In Figure 3-14, a single node accesses ATM service in the method of 4:1 bandwidthconvergence with the rate of 155 Mbit/s.

According to the ring network rate, ATM service data can share one VC-4 or eachoccupies a VC-4 path. In addition, the ring network can access ATM backbone switchor higher-order SDH ring network via a certain node.

l Requirement of AP1x4 board configuration

Configure the AP1x4 board at each node that accesses ATM service, so as toimplement the bandwidth convergence function and improve the bandwidth utilizationratio. The other nodes in the ring network do not need such configuration.

l ATM service protection

ATM service supports the SDH-layer protection and ATM-layer protection, amongwhich the ATM-layer protection refers to VP or VC protection and is performed byAP1x4 board.

In case of network fault, SDH-layer protection is enabled first. If the ATM-layerprotection switching delay has passed and the SDH-layer protection is still invalid,the ATM-layer protection will be enabled. After the service recovers, ATM servicewill return from the protection path to the previous working path after the switchingrecovery time passed.

3.4.3 RPR Service NetworkingConfigured with RSEB board, ZXMP S325 can map Ethernet service to Resilient PacketRing (RPR) and complete the unique function of RPR. In addition, it uses the path

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bandwidth of SDH/MSTP ring network to offer the dual-ringlet topology required by RPRand to realize the ring connection of RPR nodes.

The system side of RSEB board offers two RPR SPAN ports and four EOS ports. The RPRSPAN ports support a bidirectional RPR ring with the rate varying from 155 Mbit/s to 1.25Gbit/s. The EOS system port can work for RPR service cross-ring, or for communicationwith SFEx6 or SED board.

Figure 3-15 show an application of RPR ring network.

Figure 3-15 Application of RPR Ring Network

RPR has a dual-ringlet structure, which is similar to the topology of SDH bidirectional MSring. It consists of two ringlets with opposite directions. The ringlet with clockwise directionis called ringlet 0, and that with counter-clockwise direction is called ringlet 1.

When configuring the RSEB boards to form a RPR ring, it is necessary to connect theSPAN1 port with the neighbored SPAN2 port in the RPR ring, as shown in Figure 3-15.

3.5 Application Example

3.5.1 Service RequirementsSuppose 2.5 Gbit/s SDH optical transmission equipments are used in an opticaltransmission project to support communication between four sites of A, B, C, and D. Thephysical locations of these four sites are illustrated in Figure 3-16.

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Figure 3-16 Site Locations

Service requirements among the sites are:

l Between site A and site B: two STM-1 optical signal servicesl Between site A and site C: two STM-1 optical signal services, and a transparent

transmission Ethernet electrical service with the rate less than 100 Mbit/sl Between site A and site D: two STM-1 optical signal servicesl Between site B and site D: fifteen 2 M servicesl Orderwire telephone is available among the sites.

3.5.2 Networking Analysisl Determine equipment type and rate

Since the network aggregate rate is 2.5 Gbit/s, it is recommended to install ZXMPS325 at the rate of STM-16 at sites A, B, C, and D.

l Determine network topology

Determine the network topology according to the distribution of sites and services.Generally, a ring network is recommended for it has good self-healing capability, aslong as routing allows or the cables and optical fibers are sufficient. For complexsite distribution, the hybrid network with multiple networking topology modes can beconsidered.

In this example, a ring network is recommended according to the geographicallocations and service distribution of the sites.

l Determine protection mode

To enhance the system reliability, the ring network is configured as a MS protectionring at the STM-16 level.

l Determine EMS and access NE

Select to install the EMS according to the equipment type. The selected EMS shouldbe able to ensure unified management of different kinds of devices in the network as

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much as possible. The access NE refers to the NE that accesses the EMS computer.Usually the access NE is placed at the site where the service traffic is relativelycentralized.

Decide whether the connection between the EMS and access NE is local or remote.In the case of a remote EMS, determine the type of the communication network.

In this example, the NetNumen U31 R22 is adopted as the EMS since the network iscomposed of ZXMP S325. Site A is configured as the access NE where the traffic isthe heaviest. The connection between the EMS and the access NE is local.

l Determine clock source and network head NE

Determine the clock source according to the user requirements. The clock sourcesinclude the external clock, line clock, and internal clock. The network headNE refers tothe NE configured as the clock source. The network synchronization clock is obtainedfrom this NE. Usually, the same NE is configured as both the network head NE andthe access NE in order to facilitate the routine maintenance of the equipment.

In this example, NE A is configured as the network head NE, and the internal clock isselected as the clock source.

Based on the analysis above, the network diagram is illustrated in Figure 3-17.

Figure 3-17 Network Diagram

3.5.3 Configurations

Board Configurations

Pay attention to the following points when configuring the boards for a NE:

l Functional boards: The MB, NCP, OCS16, SAI boards must be configured. Toenhance the system stability, configure two OCS16 boards.

l Service boards and service interface boards

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Select optical/electrical line boards, Ethernet board, and interface boards accordingto the rate and quantity of services. And select optical module types according totransmission distances.

In this example, the service boards and service interface boards involved are listed inTable 3-2.

Table 3-2 Configuration of Service Processor Boards and Interface Boards

Service Type Service Board and Service Interface Board

STM-16 optical service OCS16

STM-1 optical service LP1x2OIS1x2

E1 service EPE1x21ESE1x21

Ethernet electrical service SFEx6EIFEx4

The board configurations of each NE are listed in Table 3-3.

Table 3-3 Board Configurations of Sites A, B, C, and D

Board QuantityBoard Type

Site A Site B Site C Site D

MBA 1 1 1 1

NCP 1 1 1 1

SAI 1 1 1 1

OCS16 2 2 2 2

EPE1x21 - 1 - 1

ESE1x21 - 1 - 1

LP1x2L-1.1 3 1 1 1

OIS1x2 3 1 1 1

SFEx6 1 - 1 -

EIFEx4 1 - 1 -

Structural Part Configurations

l Cabinet configuration

ZXMP S325 provides two kinds of cabinets of height 2000 mm and 2200 mmrespectively. Choose one of them according to the equipment room circumstancesand the service requirements. In this example, it is assumed that each site isconfigured with a ZXMP S325 cabinet 2200 mm high.

l Configuration of cabinet fittings

The cabinet fittings include the power distribution box, subrack, fan plug-in box, anddust-proof unit. The number of equipment fittings varies with cabinets. Each 2200

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mm cabinet is configured with one of power distribution box, subrack, fan plug-in box,and dust-proof unit respectively.

Fiber Pigtail and Cable Configurations

l Fiber pigtail

The connector of OCS16 board optical interface is LC/PC. The connectors of OIS1x2board optical interfaces are SC/PC. Select proper fiber pigtail to connect an opticalinterface with another optical interface as per the optical interface types. For example,if the OCS16 board optical interface connects with an FC/PC optical interface,configure the fiber pigtail to LC/PC-FC/PC; if the OIS1x2 board optical interfaceconnects with an LC/PC optical interface, configure the fiber pigtail to SC/PC-FC/PC.

Each optical interface is configured with two fiber pigtails. The total amount of fiberpigtails is subject to the actual project requirements.

l 2 M cable

The ESE1x21 board of ZXMP S325 provides 21 channels of 2 M signals. Select the75 non-balanced SCI micro-coaxial cable or 120 balanced twisted pair accordingto the requirements of this network example.

l Network cable

A network cable is used to connect the access NE and the EMS. Use the crossovernetwork cable if the EMS and the access NE connect directly. Use the straight-throughnetwork cable if the EMS and the access NE connect via HUB.

l External power cords and grounding cables

External power cords include two groups, and each group contains a -48 V powercord and a -48 V GND power cord. The -48 V power cords connect to the air switch.The -48 V GND power cords connect to the -48 V GND binding post of the powerdistribution box.

The grounding cables include the system working ground cable (GND) and theprotection ground cable (PGND). They connect to the corresponding groundingbusbar in the equipment room.

Networking ConfigurationNetworking configurations are implemented in the NetNumen U31 R22. There are twotypical configuration flows:

l Create the NE as online

Create an online NE Select the access NE Install boards Connect the NE Configure the MS protection Configure services Configure overheads Configure clock sources Configure orderwire Extract the NCP time

l Create the NE as offline

Create an offline NE Select the access NE Install boards Connect the NE Configure the MS protection Configure services Configure overheads

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Configure clock sources Configure orderwire Modify the NE to be online Download NE database Extract the NCP time

Note:

Refer to the NetNumen U31 R22 EMS/SNMS operation manual for detailed operations ofnetworking configuration.

3.5.4 Application FeaturesIn this example, the networking employs the ring network topology, and the protectionmethod is the two-fiber bidirectional multiplex section protection ring.

When any site of the ring network fails or the fiber is broken, the service will not be affectedand the transmission will continue by switching to the protection mode due to the networkself-healing function and the hot backup functions of the critical boards.

The multiplex section protection ring enables the repetitive use of the time slots in the ring.The maximum service capacity of the ring network can reach as much as K/2STM-N (Krefers to the number of nodes in the ring network, STM-N is the maximum rate of the ringnetwork). Thus the maximum service capacity of this networking example is 2STM-16.

This networking mode is applicable to the transmission backbone networks with scatterednodes (sites) and high service reliability requirements.

3-22


GlossaryADM- Add/Drop Multiplexer

APS- Automatic Protection Switching

ATM- Asynchronous Transfer Mode

AU- Admininstrative Unit

AU-AIS- Administrative Unit - Alarm Indication Signal

AU-LOP- Administrative Unit-Loss of Pointer

DNI- Dual Node Interconnection

ECC- Embedded Control Channel

EMS- Electromagnetic Susceptibility

EOS- Ethernet Over SDH

ETSI- European Telecommunications Standards Institute

FE- Fast Ethernet

GE- Gigabit Ethernet

GUI- Graphical User Interface

MSTP- Multi-Service Transport Platform

NE- Network Element

PDH- Plesiochronous Digital Hierarchy

I



QoS- Quality of Service

REG- REGenerator

RPR- Resilient Packet Ring

SDH- Synchronous Digital Hierarchy

SNCP- Sub-Network Connection Protection

SOH- Section Overhead

SPAN- Span

SSM- Synchronization Status Message

STM-N- Synchronous Transport Module, level NN=1, 4, 16, 64

TM- Terminal Multiplexer

TU- Tributary Unit

TU-AIS- Tributary Unit Alarm Indication Signal

TU-LOP- Tributary Unit-Loss of Pointer

VC- Virtual Channel

VCG- Virtual Container Group

VLAN- Virtual Local Area Network

VP- Virtual Path

II


About This ManualChapter 1 Product Position and Features1.1 Product Position1.2 Product Features

Chapter 2 Product Architecture2.1 Logical Structure2.2 Hardware Structure2.2.1 Subrack2.2.2 Board Types

2.3 Software Architecture2.3.1 Overview of Software Architecture2.3.2 Board Software2.3.3 Agent Software2.3.4 EMS Software

Chapter 3 Configuration and Networking3.1 Networking Modes3.1.1 Point-to-Point Network3.1.2 Chain Network3.1.3 Ring Network3.1.4 DNI Network

3.2 Board Configurations in Subrack3.2.1 Board Description3.2.2 Board Configuration Description

3.3 Typical NE Configurations3.3.1 Terminal Multiplexer (TM)3.3.2 Add/Drop Multiplexer (ADM)3.3.3 Regenerator (REG)

3.4 Networking Application of Multi-Service Node3.4.1 Networking via SFEx6 Board3.4.2 ATM Service Application3.4.3 RPR Service Networking

3.5 Application Example3.5.1 Service Requirements3.5.2 Networking Analysis3.5.3 Configurations3.5.4 Application Features

Glossary

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