-
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]
-
LEGAL INFORMATIONCopyright 2012 ZTE CORPORATION.
The contents of this document are protected by copyright laws
and international treaties. Any reproduction or
distribution of this document or any portion of this document,
in any form by any means, without the prior written
consent of ZTE CORPORATION is prohibited. Additionally, the
contents of this document are protected by
contractual confidentiality obligations.
All company, brand and product names are trade or service marks,
or registered trade or service marks, of ZTE
CORPORATION or of their respective owners.
This document is provided as is, and all express, implied, or
statutory warranties, representations or conditions
are disclaimed, including without limitation any implied
warranty of merchantability, fitness for a particular purpose,
title or non-infringement. ZTE CORPORATION and its licensors
shall not be liable for damages resulting from the
use of or reliance on the information contained herein.
ZTE CORPORATION or its licensors may have current or pending
intellectual property rights or applications
covering the subject matter of this document. Except as
expressly provided in any written license between ZTE
CORPORATION and its licensee, the user of this document shall
not acquire any license to the subject matter
herein.
ZTE CORPORATION reserves the right to upgrade or make technical
change to this product without further notice.
Users may visit ZTE technical support website
http://ensupport.zte.com.cn to inquire related information.
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
3.5.2 Networking Analysis
...............................................................................
3-18
3.5.3
Configurations........................................................................................
3-19
3.5.4 Application
Features...............................................................................
3-22
Glossary
..........................................................................................................
I
II
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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.
1-4
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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.
2-2
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
ZXMP S325 System Description
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
2-4
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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.
2-5
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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.
2-6
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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.
2-7
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
ZXMP S325 System Description
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.
2-8
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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.
2-9
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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.
2-10
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
Chapter 2 Product Architecture
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
ZXMP S325 System Description
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.
2-12
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
ZXMP S325 System Description
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.
3-2
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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.
3-3
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
ZXMP S325 System Description
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
Chapter 3 Configuration and Networking
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
3-5
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
ZXMP S325 System Description
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
3-6
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
Chapter 3 Configuration and Networking
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
3-7
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
ZXMP S325 System Description
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.
3-8
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
Chapter 3 Configuration and Networking
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
ZXMP S325 System Description
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.
3-10
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
Chapter 3 Configuration and Networking
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
ZXMP S325 System Description
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.
3-12
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
Chapter 3 Configuration and Networking
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.
3-13
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
ZXMP S325 System Description
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.
3-14
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
Chapter 3 Configuration and Networking
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.
3-15
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
ZXMP S325 System Description
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
3-16
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
Chapter 3 Configuration and Networking
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.
3-17
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
ZXMP S325 System Description
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
3-18
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
Chapter 3 Configuration and Networking
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
3-19
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
ZXMP S325 System Description
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
3-20
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
Chapter 3 Configuration and Networking
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
3-21
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
ZXMP S325 System Description
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
-
ZXMP S325 System Description
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
SJ-20120320184105-001|2012-07-30(R1.1) ZTE Proprietary and
Confidential
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