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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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)
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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
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3.5.2 Networking Analysis ............................................................................... 3-18
3.5.3 Configurations........................................................................................ 3-19
3.5.4 Application Features............................................................................... 3-22
Glossary .......................................................................................................... I
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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.
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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.
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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
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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.
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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
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ZXMP S325 System Description
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.
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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.
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ZXMP S325 System Description
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.
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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.
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S.N. Name Position in the Subrack Brief Description
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
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Chapter 2 Product Architecture
S.N. Name Position in the Subrack Brief Description
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.
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ZXMP S325 System Description
Board ID Board Name Description
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.
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Chapter 2 Product Architecture
Board ID Board Name Description
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.
OIS1x4 4-channel STM-1 opti-
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.
OIS4x1 1-channel STM-4 opti-
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.
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Board ID Board Name Description
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
12021-channel E1 electrical
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
7521-channel E1 electrical
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.
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Chapter 2 Product Architecture
Board ID Board Name Description
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.
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ZXMP S325 System Description
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.
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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.
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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.
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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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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.
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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
Interface board OIS1x1 or OIS1x2
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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Service/Service Interface Boards NeededService Type
Type Board ID
Service board EPE1x21 or EPE1B
Interface bridge board BIE1x21
E1 service with 1:N (N6)
protection
Interface switching board ESE1x21
Service board EPT1x21 or EPE1BT1 service
Interface switching board ESE1x21
Service board EPT1x21 or EPE1B
Interface bridge board BIE1x21
T1 service with 1:N (N5)
protection
Interface switching board ESE1x21
Service board EP3x3E3 service
Interface switching board ESE3x3
Service board EP3x3
Interface bridge board BIE3
E3 service with 1:N (N5)
protection
Interface switching board ESE3x3
Service board EP3x3T3 service
Interface switching board ESE3x3
Service board EP3x3
Interface bridge board BIE3
T3 service with 1:N (N5)
protection
Interface switching board ESE3x3
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
Interface board OIS1x4 or OIS1x6
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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Service/Service Interface Boards NeededService Type
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.
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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
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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.
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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
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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
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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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