ptn 950 huawei product description
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OptiX PTN 950 Packet Transport Platform of PTN
Series
V100R002C01
Product Description
Issue 02
Date 2010-12-28
HUAWEI TECHNOLOGIES CO., LTD.
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Copyright Huawei Technologies Co., Ltd. 2010. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior written
consent of Huawei Technologies Co., Ltd.
Trademarks and Permissions
and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective holders.
Notice
The purchased products, services and features are stipulated by the contract made between Huawei and the
customer. All or part of the products, services and features described in this document may not be within the
purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,and recommendations in this document are provided "AS IS" without warranties, guarantees or representations
of any kind, either express or implied.
The information in this document is subject to change without notice. Every effort has been made in the
preparation of this document to ensure accuracy of the contents, but all statements, information, and
recommendations in this document do not constitute the warranty of any kind, express or implied.
Huawei Technologies Co., Ltd.
Address: Huawei Industrial Base
Bantian, Longgang
Shenzhen 518129
People's Republic of China
Website: http://www.huawei.com
Email: [email protected]
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About This Document
Related Versions
The following table lists the product versions related to this document.
Product Name Version
OptiX PTN 950 V100R002C01
Huawei iManager U2000 V100R002C01
Intended Audience
This document describes the networking application, functions, structure, features and hardwareof the OptiX PTN 950.
This document is intended for:
l Network Planning Engineers
Symbol Conventions
The symbols that may be found in this document are defined as follows.
Symbol Description
DANGER
Indicates a hazard with a high level of risk, which if not
avoided, will result in death or serious injury.
WARNING
Indicates a hazard with a medium or low level of risk, which
if not avoided, could result in minor or moderate injury.
CAUTION
Indicates a potentially hazardous situation, which if not
avoided, could result in equipment damage, data loss,
performance degradation, or unexpected results.
OptiX PTN 950 Packet Transport Platform of PTN Series
Product Description About This Document
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Symbol Description
NOTE Provides additional information to emphasize or supplement
important points of the main text.
TIP Indicates a tip that may help you solve a problem or savetime.
GUI Conventions
The GUI conventions that may be found in this document are defined as follows.
Convention Description
Boldface Buttons, menus, parameters, tabs, window, and dialog titles
are in boldface. For example, click OK.
> Multi-level menus are in boldfaceand separated by the ">"
signs. For example, choose File> Create> Folder.
Change History
Updates between document issues are cumulative. Therefore, the latest document issue containsall updates made in previous issues.
Update in Issue 02 (2010-12-28) Based on Product Version V100R002C01
Certain bugs are fixed.
Update in Issue 01 (2010-11-15) Based on Product Version V100R002C01
This document is the first release of the V100R002C01 version.
About This Document
OptiX PTN 950 Packet Transport Platform of PTN Series
Product Description
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Contents
About This Document...................................................................................................................iii
1 NetworkPosition and Product Features................................................................................1-1
1.1 Network Position.............................................................................................................................................1-2
1.2 Equipment Features.............................................................................................................. ...........................1-31.2.1 RichService Types.................................................................................................................................1-4
1.2.2 Powerful Processing Capability.............................................................................................................1-4
1.2.3 RichInterface Types..............................................................................................................................1-5
1.2.4 Protection Capabilities...........................................................................................................................1-7
1.2.5 Layered OAM........................................................................................................................................1-8
1.2.6 QoSCapabilities..................................................................................... ................................................1-8
1.2.7 Precision Synchronization....................................................................................................................1-10
1.2.8 DHCP Relay.........................................................................................................................................1-11
1.2.9 HighEfficiency Tunnel Technology....................................................................................................1-11
1.2.10 Green Network Design for Energy Conservation..............................................................................1-11
2 System Structure.........................................................................................................................2-1
2.1 Hardware Structure.........................................................................................................................................2-2
2.1.1 Chassis....................................................................................................................................................2-2
2.1.2 Boards.....................................................................................................................................................2-3
2.2 Software Structure...........................................................................................................................................2-5
3 Introduction to Services............................................................................................................3-1
3.1 Service Model.................................................................................................................................................3-2
3.2 CES Services...................................................................................................................................................3-3
3.3 IMA/ATM Services.........................................................................................................................................3-5
3.4 Ethernet Services.............................................................................................................................................3-6
3.5 IP over PW......................................................................................................................................................3-8
4 QoS................................................................................................................................................4-1
4.1 DiffServ...........................................................................................................................................................4-2
4.2 HQoS.................................................................................................................................... ...........................4-4
5 OAM.............................................................................................................................................5-1
5.1 MPLS Tunnel OAM........................................................................................................................................5-3
5.2 PW OAM.........................................................................................................................................................5-3
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5.3 Ethernet Service OAM....................................................................................................................................5-4
5.4 Ethernet Port OAM......................................................................................................................................... 5-7
5.5 ATM OAM......................................................................................................................................................5-7
5.6 BFD.................................................................................................................................................................5-8
5.7 LPT..................................................................................................................................................................5-9
6 Protection.....................................................................................................................................6-1
6.1 NSF Features...................................................................................................................................................6-2
6.2 Equipment Level Protection............................................................................................................................6-2
6.3 Network Level Protection............................................................................................................................... 6-2
6.3.1 MPLS Tunnel APS Protection............................................................................................................... 6-3
6.3.2 Offload Protection..................................................................................................................................6-6
6.3.3 PW APS................................................................................................................................................6-10
6.3.4 Dual-Homing Protection......................................................................................................................6-11
6.3.5 Dual-Homing Protection for IP over PW.............................................................................................6-13
6.3.6 FRR Protection.....................................................................................................................................6-15
6.3.7 LMSP...................................................................................................................................................6-17
6.3.8 LAG Protection....................................................................................................................................6-18
6.3.9 ML-PPP Protection..............................................................................................................................6-20
6.3.10 IMA Protection...................................................................................................................................6-21
6.3.11 Ethernet Spanning Tree Protection....................................................................................................6-21
7 Synchronization..........................................................................................................................7-1
7.1 Physical Layer Synchronization......................................................................................................................7-2
7.2 IEEE 1588 V2................................................................................................................................................. 7-5
7.3 1588 ACR........................................................................................................................................................7-7
7.4 Overview of CES ACR...................................................................................................................................7-8
8 Value-Added Feature.................................................................................................................8-1
8.1 DHCP Relay....................................................................................................................................................8-2
9 Bearer Technology.....................................................................................................................9-1
9.1 MPLS.............................................................................................................................................................. 9-2
9.1.1 Background............................................................................................................................................ 9-2
9.1.2 Basic Concepts.......................................................................................................................................9-29.1.3 System Structure.................................................................................................................................... 9-4
9.1.4 MPLS Features of the Equipment..........................................................................................................9-4
9.2 PWE3.............................................................................................................................................................. 9-5
9.3 IP Tunnels/GRE Tunnels................................................................................................................................ 9-6
10 Protocols of theControl Plane.............................................................................................10-1
10.1 MPLS Signaling..........................................................................................................................................10-2
10.2 IS-IS Routing Protocol................................................................................................................................10-2
11 DCN..........................................................................................................................................11-1
12 Operation and Maintenance................................................................................................12-1
Contents
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12.1 U2000 System.............................................................................................................................................12-2
12.2 Monitoring and Maintenance......................................................................................................................12-3
12.3 Diagnosis and Debugging...........................................................................................................................12-3
12.4 Expansion and Upgrade..............................................................................................................................12-3
13 Security Management............................................................................................................13-1
13.1 Authentication Management.......................................................................................................................13-2
13.2 Authorization Management.........................................................................................................................13-2
13.3 Network Security Management...................................................................................................................13-2
13.4 System Security Management.....................................................................................................................13-3
13.5 NE Security Log Management....................................................................................................................13-3
13.6 Syslog Management....................................................................................................................................13-3
13.7 White NameList for the MAC Address......................................................................................................13-4
14 Application Scenario.............................................................................................................14-114.1 Networking with PTN Equipment Only......................................................................................................14-2
14.2 Networking with a Third-Party Network Between PTN NEs.....................................................................14-6
14.2.1 Networking with a Layer 2 Network Between PTN NEs..................................................................14-7
14.2.2 Networking with a Layer 3 Network Between PTN NEs................................................................14-12
14.2.3 Offload.............................................................................................................................................14-18
15 List of SoftwareFeatures......................................................................................................15-1
16 Technical Specifications.......................................................................................................16-1
16.1 Physical Specifications................................................................................................................................16-3
16.2 Performance and Capacity..........................................................................................................................16-4
16.3 Technical Specifications of Boards...........................................................................................................16-10
16.3.1 CXP..................................................................................................................................................16-11
16.3.2 EF8T.................................................................................................................................................16-11
16.3.3 EF8F.................................................................................................................................................16-11
16.3.4 EG2...................................................................................................................................................16-12
16.3.5 EG4F................................................................................................................................................16-14
16.3.6 TND1ML1/TND1ML1A.................................................................................................................16-17
16.3.7 TND2ML1A/TND2ML1B...............................................................................................................16-17
16.3.8 MD1A/MD1B..................................................................................................................................16-1816.3.9 CD1..................................................................................................................................................16-19
16.3.10 ADS2A/ADS2B.............................................................................................................................16-19
16.3.11 SHD4..............................................................................................................................................16-20
16.3.12 SHD4I.............................................................................................................................................16-21
16.3.13 AUXQ............................................................................................................................................16-21
16.3.14 PIU.................................................................................................................................................16-22
16.3.15 APIU...............................................................................................................................................16-22
16.3.16 FAN................................................................................................................................................16-22
16.4 Technical Specifications of Optical Interfaces..........................................................................................16-23
16.5 Laser Safety Class.....................................................................................................................................16-25
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16.6 Specifications of Clock Interfaces.............................................................................................................16-25
16.7 Reliability Specifications..........................................................................................................................16-26
16.8 EMC Performance Specifications.............................................................................................................16-26
16.9 Safety Certifications..................................................................................................................................16-28
16.10 Environment Requirements.....................................................................................................................16-28
16.10.1 Environment for Storage................................................................................................................16-28
16.10.2 Environment for Transportation.....................................................................................................16-30
16.10.3 Operation Environment..................................................................................................................16-32
17 Compliant Standards and Protocols...................................................................................17-1
A Glossary.....................................................................................................................................A-1
Contents
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Figures
Figure 1-1Appearance of the OptiX PTN 950.................................................................................................... 1-2
Figure 1-2Typical networking of the OptiX PTN 950........................................................................................1-3
Figure 1-3QoS process........................................................................................................................................1-9
Figure 1-4Queue scheduling............................................................................................................................... 1-9
Figure 2-1Appearance of the OptiX PTN 950.................................................................................................... 2-2
Figure 2-2Slot allocation of the OptiX PTN 950................................................................................................2-3
Figure 2-3Board relations of the OptiX PTN 950...............................................................................................2-5
Figure 2-4Software structure of the OptiX PTN 950..........................................................................................2-6
Figure 3-1Application model of the CES service............................................................................................... 3-4
Figure 3-2Retiming synchronization mode of the CES service clock................................................................ 3-5
Figure 3-3Self-adaptation synchronization mode of the CES service clock.......................................................3-5
Figure 3-4E-Line service illustration.................................................................................................................. 3-7
Figure 3-5E-LAN service illustration..................................................................................................................3-8
Figure 3-6Deployment of IP over PW services...................................................................................................3-9Figure 4-1Networking diagram for the DiffServ model......................................................................................4-2
Figure 4-2HQoS function points and QoS processing........................................................................................4-5
Figure 5-1CC detection diagram.........................................................................................................................5-5
Figure 5-2LB detection diagram......................................................................................................................... 5-5
Figure 5-3LTdetection diagram..........................................................................................................................5-6
Figure 5-4Application scenarios of the Ethernet service OAM..........................................................................5-6
Figure 5-5ATM faults at Node B and an RNC................................................................................................... 5-8
Figure 5-6ATM faults at the NNI side................................................................................................................5-8
Figure 5-7BFD networking application.............................................................................................................. 5-9
Figure 5-8Application scenario of LPT.............................................................................................................5-10
Figure 6-1MPLS Tunnel 1+1 protection.............................................................................................................6-4
Figure 6-2MPLS Tunnel 1:1 protection..............................................................................................................6-4
Figure 6-3Networking of offload protection where an MPLS tunnel protects an IP/GRE tunnel......................6-7
Figure 6-4Networking of offload protection where an IP/GRE tunnel protects an IP/GRE tunnel....................6-8
Figure 6-5PW APS networking.........................................................................................................................6-10
Figure 6-6Protection for IP over PW services...................................................................................................6-14
Figure 6-7Protection switching for IP over PW services in case of an equipment fault...................................6-14
Figure 6-8Protection switching for IP over PW services in case of a link fault...............................................6-15
Figure 6-9FRR Protection.................................................................................................................................6-16
OptiX PTN 950 Packet Transport Platform of PTN Series
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Figure 6-101+1 LMSP.......................................................................................................................................6-17
Figure 6-111:1 LMSP........................................................................................................................................6-17
Figure 6-12Ethernet LAG protection................................................................................................................6-19
Figure 6-13ML-PPP protection.........................................................................................................................6-20
Figure 6-14IMA transmission...........................................................................................................................6-21
Figure 6-15Switching network with multiple VLANs......................................................................................6-22
Figure 6-16Network topology after the MSTP begins running........................................................................6-22
Figure 7-1Networking of physical-layer clock synchronization.........................................................................7-3
Figure 7-2Clock working mode..........................................................................................................................7-4
Figure 7-3Networking diagram for typical application of the PTP clock...........................................................7-6
Figure 7-4Application scenario of the IEEE 1588 ACR clock...........................................................................7-8
Figure 7-5CES ACR application scenario.........................................................................................................7-10
Figure 8-1Application of DHCP relay................................................................................................................8-2
Figure 8-2Application scenario of DHCP relay on a Layer 2 network...............................................................8-3
Figure 8-3Application scenario of DHCP relay on a Layer 3 network...............................................................8-3
Figure 9-1Label encapsulation structure.............................................................................................................9-3
Figure 9-2Encapsulation location of labels in a packet.......................................................................................9-3
Figure 9-3ATM PWE3 services carried over MPLS tunnels..............................................................................9-7
Figure 9-4ATM PWE3 services carried over IP tunnels.....................................................................................9-7
Figure 9-5ATM PWE3 services carried over GRE tunnels................................................................................9-8
Figure 11-1External DCN and internal DCN....................................................................................................11-1
Figure 11-2Direct addressing and gateway addressing modes..........................................................................11-3
Figure 11-3DCN over control plane..................................................................................................................11-4Figure 11-4DCN over management plane.........................................................................................................11-5
Figure 13-1Schematic diagram of Syslog protocol transmitting.......................................................................13-4
Figure 14-1Transport network built with only PTN NEs to transmit user services..........................................14-2
Figure 14-2Transport network where PTN NEs function as gateways to transmit user services over a Layer 2
network................................................................................................................................................................14-7
Figure 14-3Transport network where PTN NEs function as gateways to transmit user services over a Layer 3
network..............................................................................................................................................................14-13
Figure 14-4Transport network where the PTN NEs use the offload solution to transmit user services.........14-19
Figures
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Tables
Table 1-1service types supported by OptiX PTN 950.........................................................................................1-4
Table 1-2Maximum service switching capability of the OptiX PTN 950...........................................................1-5
Table 1-3Maximum access capability of the OptiX PTN 950............................................................................ 1-5
Table 1-4Service interfaces of the OptiX PTN 950............................................................................................ 1-6
Table 1-5Administration and auxiliary interfaces of the OptiX PTN 950.......................................................... 1-6
Table 1-6Equipment level protection provided by the OptiX PTN 950..............................................................1-7
Table 1-7Network level protection provided by the OptiX PTN 950.................................................................1-7
Table 1-8OAM Functions for OptiX PTN 950................................................................................................... 1-8
Table 1-9QoS capabilities................................................................................................................................... 1-9
Table 1-10Tunnel technology supported by the OptiX PTN 950.....................................................................1-11
Table 2-1Boards supported by the OptiX PTN 950 and their valid slots............................................................2-3
Table 3-1Comparison among L2 Ethernet services stipulation...........................................................................3-6
Table 4-1Queue scheduling and application....................................................................................................... 4-3
Table 5-1Application scenarios of the MPLS Tunnel OAM...............................................................................5-3Table 5-2Application scenarios of the PW OAM............................................................................................... 5-4
Table 5-3Application scenarios of the detection methods of the Ethernet service OAM................................. ..5-6
Table 6-1Equipment level protection provided by the OptiX PTN 950..............................................................6-2
Table 6-2Parameters of the MPLS Tunnel 1:1 protection...................................................................................6-5
Table 6-3Parameters of the MPLS Tunnel 1+1 protection..................................................................................6-6
Table 6-4Protection scenarios and protection types of tunnels on a network..................................................... 6-7
Table 6-5Parameters for offload protection.........................................................................................................6-9
Table 6-6Dual-homing protection schemes for various services......................................................................6-11
Table 6-7Support for various factors of dual-homing protection......................................................................6-13
Table 6-8Parameters of the 1+1 and 1:1 LMSP................................................................................................6-18
Table 9-1MPLS features supported by the OptiX PTN 950............................................................................... 9-5
Table 9-2Capabilities of the equipment of supporting PWE3.............................................................................9-6
Table 14-1Typical bearing modes in which various user services are transmitted over a PTN network..........14-3
Table 14-2Typical network built with PTN equipment only............................................................................14-5
Table 14-3Typical bearing modes in which various user services are transmitted over a PSN (PTN NEs with a
Layer 2 network in between)...............................................................................................................................14-8
Table 14-4Typical network solutions in which PTN NEs function as gateways to transmit services over a Layer
2 network...........................................................................................................................................................14-10
Table 14-5Typical bearing modes in which various user services are transmitted over a PSN (PTN NEs with aLayer 3 network in between).............................................................................................................................14-14
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Table 14-6Typical network solutions in which PTN NEs function as gateways to transmit services over a Layer
3 network...........................................................................................................................................................14-16
Table 14-7Typical bearing modes in which a variety of user services are transmitted in the offload solution
...........................................................................................................................................................................14-20
Table 15-1List of software features...................................................................................................................15-1Table 16-1Technical specifications of the chassis.............................................................................................16-3
Table 16-2Performance and capacity................................................................................................................16-5
Table 16-3Specifications of interfaces on the EF8T.......................................................................................16-11
Table 16-4Performance specifications of the FE optical interface..................................................................16-12
Table 16-5Technical specifications of the GE optical interface......................................................................16-12
Table 16-6Wavelength allocation of 1000BASE-CWDM optical interfaces and related optical module code
...........................................................................................................................................................................16-14
Table 16-7Wavelength allocation of 1000BASE-BX optical interfaces and related optical module code.....16-14
Table 16-8Specifications of the electrical interface on the EG2.....................................................................16-14
Table 16-9Technical specifications of the GE optical interface......................................................................16-15
Table 16-10Wavelength allocation of 1000BASE-CWDM optical interfaces and related optical module code
...........................................................................................................................................................................16-16
Table 16-11Wavelength allocation of 1000BASE-BX optical interfaces and related optical module code...16-16
Table 16-12Specifications of the interfaces on the TND1ML1/TND1ML1A................................................16-17
Table 16-13Specifications of the interfaces on the TND2ML1A/TND2ML1B........................... ..................16-17
Table 16-14Specifications of the interfaces on the MD1A/MD1B.................................................................16-18
Table 16-15Technical specifications of the STM-1 optical interface.............................................................16-19
Table 16-16Performance specifications of the ADS2A..................................................................................16-20
Table 16-17Performance specifications of the ADS2B..................................................................................16-20Table 16-18Performance specifications of the SHD4.....................................................................................16-20
Table 16-19Specifications of the interfaces of the SHD4I..............................................................................16-21
Table 16-20Technical specifications of the FE1 - FE4...................................................................................16-21
Table 16-21Technical specifications of the PIU.............................................................................................16-22
Table 16-22Technical specifications of the APIU...........................................................................................16-22
Table 16-23Technical specifications of the FAN............................................................................................16-22
Table 16-24Technical specifications of optical interfaces..............................................................................16-23
Table 16-25Wavelength allocation for 1000BASE-CWDM optical interfaces..............................................16-24
Table 16-26Wavelength allocation for 1000BASE-BX optical interfaces......................................................16-24
Table 16-27Description of clock interfaces of the OptiX PTN 950................................................................16-25
Table 16-28Timing and synchronization performance....................................................................................16-26
Table 16-29Reliability specifications of the OptiX PTN 950.........................................................................16-26
Table 16-30EMC test results...........................................................................................................................16-26
Table 16-31Safety certifications that the OptiX PTN 950 accords.................................................................16-28
Table 16-32Climate requirements for the storage of the OptiX PTN 950......................................................16-29
Table 16-33Density requirements for mechanical active substances during storage......................................16-30
Table 16-34Density requirements for chemical active substances during storage..........................................16-30
Table 16-35Requirements of mechanical stress for storage............................................................................16-30
Table 16-36Climate requirements for transportation......................................................................................16-31
Tables
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Table 16-37Density requirements for mechanical active substances during transportation...........................16-31
Table 16-38Density requirements for chemical active substances during transportation...............................16-32
Table 16-39Requirements of mechanical stress for transportation.................................................................16-32
Table 16-40Requirements on temperature and humidity................................................................................16-33
Table 16-41Requirements on climate for operation........................................................................................16-33
Table 16-42Density restrictions for mechanical active substances during operation......................................16-34
Table 16-43Density requirements for chemical active substances during transportation...............................16-34
Table 16-44Requirements for mechanical stress during operation.................................................................16-34
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1Network Position and Product FeaturesAbout This Chapter
Describes the network position and product features of the OptiX PTN 950.
1.1 Network Position
The OptiX PTN 950 is new generation access equipment developed by Huawei for packet-based
mobile backhaul network.
1.2 Equipment Features
The OptiX PTN 950 supports various types of services and provides rich functions and features
to ensure service transport quality and efficiency.
OptiX PTN 950 Packet Transport Platform of PTN Series
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1.1 Network Position
The OptiX PTN 950 is new generation access equipment developed by Huawei for packet-based
mobile backhaul network.
Equipment Introduction
The OptiX 950 has the following features:
l It adopts the packet transport technology to meet the increasing requirements on bandwidth
and the demanding requirements on the flexibility of the bandwidth scheduling.
l It adopts the pseudo wire emulation edge to edge (PWE3) technology to carry connection-
oriented services.
l It supports the access of services from base stations by using various modes, such as time
division multiplexing (TDM), ATM/IMA, and fast Ethernet (FE) , and gigabit Ethernet(GE). It also supports the smooth evolution from the 2G mobile communication carrier
network to the 3G mobile communication carrier network.
l With the complete operation, administration, and maintenance (OAM), Quality of Service
(QoS), and protection switching mechanism, it adopts the multi-protocol label switch
(MPLS) forwarding technology to optimize telecommunication carrier network and uses
the packet-based transport network to provide telecommunication services.
l It supports the offload solution to divide and carry the flow of base station services such
as the high speed downlink packet access (HSDPA) services and R99 services, and uses
the x digital subscriber line (xDSL) board to transmit the HSDPA services through an
interconnected leased network, to reduce the transmission cost.
Figure 1-1shows the appearance of the OptiX PTN 950 equipment.
Figure 1-1Appearance of the OptiX PTN 950
Networking Application
The OptiX PTN 950 can be placed either on the base station side to access base station services
or on the convergence node side to converge services. The OptiX PTN 950 can integrate services
accessed by multiple OptiX PTN 910 or OptiX PTN 912 and then send the services to the
equipment that works at a higher layer.
Figure 1-2shows typical networking of the OptiX PTN 950. The OptiX PTN 950 accesses
services from the base station side through TDM E1, ATM/IMA E1 or FE interfaces. The OptiX
PTN equipment adopts ML-PPP, FE or GE interfaces for networking. When the Offload solutionis adopted, the OptiX PTN 950 is connected to the xDSL network through the xDSL interfaces
1 Network Position and Product Features
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to transmit the HSDPA services to the convergence nodes over the xDSL network. The OptiX
PTN 3900/1900 on the base station controller (BSC) or radio network controller (RNC) side
converges the services and then sends the services to the BSC or RNC.
Figure 1-2Typical networking of the OptiX PTN 950
OptiX PTN 3900/
OptiX PTN 1900OptiX PTN 950OptiX PTN 910
BSC RNC
GE 10GE
Wholesale
xDSL/Ethernet
ML-PPP/
FE/GE
xDSL/
FE/GEGE
E1
ATM E1/
IMA E1
FE
cSTM-1
ATM
STM-1
GE/
10GE
BTS NodeB
1.2 Equipment Features
The OptiX PTN 950 supports various types of services and provides rich functions and features
to ensure service transport quality and efficiency.
1.2.1 Rich Service Types
The OptiX PTN 950 supports the CES service, the ATM service, the L2VPN service, the multi-
cast service.
1.2.2 Powerful Processing Capability
The service processing capability of the OptiX PTN 950 is categorized into the switching
capability and the service access capability.
1.2.3 Rich Interface Types
The external interfaces of the OptiX PTN 950 are categorized into service interfaces,
administration and auxiliary interfaces.
1.2.4 Protection Capabilities
The OptiX PTN 950 provides equipment level protection and network level protection.
1.2.5 Layered OAM
The OptiX PTN 950 supports MPLS OAM, to realize fast defect detection and service protection.
In this way, the carrier-class quality of the service can be guaranteed in the packet switching
network.
1.2.6 QoS Capabilities
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The OptiX PTN 950 has complete quality of service (QoS) capabilities, and provides the eight
per-hop behavior (PHB) groups known as BE, AF1, AF2, AF3, AF4, EF, CS6, and CS7. With
the equipment, the network operators can provide services of different quality classes for users.
In this way, an integrated network emerges to carry data, voice and video services at the same
time.
1.2.7 Precision Synchronization
The OptiX PTN 950 supports the physical-layer clock synchronization, IEEE 1588 V2 precision
time protocol (PTP), and 1588 adaptive clock recovery (ACR) clock synchronization. With these
clock solutions, the equipment provides high-precision time/clock for the mobile
communication services.
1.2.8 DHCP Relay
The PTN equipment supports the DHCP Relay function, which helps the base stations to
automatically obtain IP addresses.
1.2.9 High Efficiency Tunnel Technology
The OptiX PTN 950 supports kinds of L2 and L3 tunnels to carry services.1.2.10 Green Network Design for Energy Conservation
The OptiX PTN 950 adopts the energy conservation design and provides the energy conservation
platform, which realizes more efficient energy management and helps reduce OpEx.
1.2.1 Rich Service Types
The OptiX PTN 950 supports the CES service, the ATM service, the L2VPN service, the multi-
cast service.
Table 1-1lists the service types supported by OptiX PTN 950.
Table 1-1service types supported by OptiX PTN 950
Service Type Description
CES service Accessed by E1 and cSTM-1 interface.
ATM service Accessed by ATM E1 and IMA.
L2VPN
service
E-Line service Point to Point Ethernet service, also named virtual
private wire service (VPWS).
E-LAN service Multi-Point to Multi-Point Ethernet service, also
named virtual private LAN service (VPLS).
Multi-Cast service Based on the IGMP Snooping technology.
1.2.2 Powerful Processing Capability
The service processing capability of the OptiX PTN 950 is categorized into the switching
capability and the service access capability.
Switching Capability
Table 1-2shows the maximum service switching capability of the OptiX PTN 950.
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Table 1-2Maximum service switching capability of the OptiX PTN 950
Product Maximum Switching Capability
Line Rate I/O Capability
OptiX PTN 950 8 G 8 G
Note: The OptiX PTN 950 provides unidirectional switching capability of 8 Gbit/s in the
ingress and egress directions. That is, the OptiX PTN 950 provides bidirectional switching
capability of 16 Gbit/s.
Maximum Access Capability
Table 1-3lists the maximum access capabilities of various interfaces of the OptiX PTN 950.
Table 1-3Maximum access capability of the OptiX PTN 950
Interface Type Number of Interfaces ofthe Board
Number of Interfaces of theEquipment
GE optical interface 2 8
GE electrical interface 2 8
FE optical interface 8 48
FE electrical interface 8 48
E1 32 192
Channelized STM-1 1 6
ADSL/ADSL2+ 8 48
G.SHDSL 4 pair 24 pair
Note 1: The OptiX PTN 950 can house six GE boards with 12 GE interfaces. However, when
housed in any of the slot 3 to slot 6, the second interface of the EG2 is not available, as a
result, a maximum of eight GE interfaces are supported by the equipment.
Note 2: The CD1 board can access two channels of STM-1 signals. These two STM-1 ports
can be only configured with LMSP protection to access the same service.
1.2.3 Rich Interface Types
The external interfaces of the OptiX PTN 950 are categorized into service interfaces,
administration and auxiliary interfaces.
Service Interfaces
Table 1-4lists the service interfaces supported by the OptiX PTN 950.
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Table 1-4Service interfaces of the OptiX PTN 950
Interface Type Description
GE Optical interface: 1000BASE-SX, 1000BASE-LX, 1000BASE-
VX, 1000BASE-ZX, 1000BASE-BX, and 1000BASE-CWDMElectrical interface: 1000BASE-T
FE Optical interface: 100BASE-FX
Electrical interface: 100BASE-TX
Channelized STM-1 STM-1 optical interface: S-1.1, L-1.1, and L-1.2
E1 75-ohm or 120-ohm E1 electrical interface
ADSL/ADSL2+ RJ-11 interface
G.SHDSL RJ-11 interface
Administration and Auxiliary Interfaces
Table 1-5lists the administration and auxiliary interfaces of the OptiX PTN 950.
Table 1-5Administration and auxiliary interfaces of the OptiX PTN 950
InterfaceType
Description Quantity
Administration
interface
NM network interface (ETH) 1 (RJ-45)
NM serial interface
Cascading network interface 1 (RJ-45)
Clock/
Time
interface
Common interface for 120-ohm clock or time 2 (RJ-45)
Auxiliary
interface
Orderwire interface 1 (RJ-45)
64 kbit/s synchronous data interface 1 (RJ-45)
Alarm input interface (four channels in total) 1 (RJ-45)
Alarm output interface (two channels in total) 1 (RJ-45)
Alarm concatenation interface (two channels in
total)
Note 1: The clock/time interfaces can be used as the clock interfaces or the time interfaces.
If the interfaces are used as the clock interfaces, they support 2048 kbit/s mode or 2048 kHz
mode. If the interfaces are used as the time interfaces, they support 1PPS + Time Information
mode or DCLS mode.
Note 2: The orderwire interface is reserved for later use.
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1.2.4 Protection Capabilities
The OptiX PTN 950 provides equipment level protection and network level protection.
The OptiX PTN 950 provides various equipment level protection schemes, as listed inTable
1-6.
Table 1-6Equipment level protection provided by the OptiX PTN 950
Protected Object Protection Scheme Revertive Mode
Control, switching and timing
board
1+1 hot backup Non-revertive
Power interface board 1+1 hot backup -
The OptiX PTN 950 provides various network level protection schemes, as listed in Table
1-7.
Table 1-7Network level protection provided by the OptiX PTN 950
Network Level Protection Scheme
MPLS Tunnel MPLS Tunnel 1+1 protection
MPLS Tunnel 1:1 protection
LSP RR protection
LSP FRR protection
PW 1+1 protection
1:1 protection
PW redundancy protection
Ethernet link Intra-board link aggregation group (LAG) protection
and inter-board LAG protection
Multiple spanning tree protocol (MSTP) protection
Channelized STM-1 1+1 LMSP
1:1 LMSP
IMA group IMA member protection
ML-PPP group ML-PPP member protection
Wholesale Managed Service
(WMS) network
Offload protection
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1.2.5 Layered OAM
The OptiX PTN 950 supports MPLS OAM, to realize fast defect detection and service protection.
In this way, the carrier-class quality of the service can be guaranteed in the packet switching
network.
Table 1-8lists the OAM functions supported by OptiX PTN 950.
Table 1-8OAM Functions for OptiX PTN 950
Type Function Remark
MPLS Tunnel OAM CV/FFD See 5.1 MPLS Tunnel OAM.
Ping
Traceroute
Performance monitoring
PW OAM CV/FFD See 5.2 PW OAM.
VCCV
Traceroute
Performance monitoring
Ethernet service
OAM
CC See 5.3 Ethernet Service OAM.
LB
LT
Performance monitoring
Ethernet port OAM Connectivity and
performance monitoring
for physical Ethernet link
See 5.4 Ethernet Port OAM.
ATM OAM Fault management See 5.5 ATM OAM.
ATM alarm transmitting
BFD Fault detecting See5.6 BFD
.
LPT Fault detecting See 5.7 LPT.
1.2.6 QoS Capabilities
The OptiX PTN 950 has complete quality of service (QoS) capabilities, and provides the eight
per-hop behavior (PHB) groups known as BE, AF1, AF2, AF3, AF4, EF, CS6, and CS7. With
the equipment, the network operators can provide services of different quality classes for users.
In this way, an integrated network emerges to carry data, voice and video services at the same
time.
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The OptiX PTN 950 supports QoS mechanisms such as flow classification, committed access
rate (CAR), and queue scheduling, as listed in Table 1-9and Figure 1-3.
Figure 1-3QoS process
Queue
scheduling
Egress portFlow
classificationCAR Forwarding
Ingress port
Table 1-9QoS capabilities
Feature Description
Flow
classification
Performs simple flow classification on VLAN packets, IP packets and
MPLS packets.
CAR Supports the color-blind mode.
Queue
scheduling
l Each physical port supports queue scheduling based on eight
priorities.
l Adopts strict priority (SP) to schedule CS7, CS6, and EF queues.
l Adopts weighted fair queuing (WFQ) to schedule AF queues.
l Adopts SP to schedule BE queues.
Figure 1-4Queue scheduling
CQ
WFQ
SP
SP
Egress
Channel
WRED
CS7
AF3
BE
Shaping
Egress
Channel 8
GE
Shaping
Shaping
1
CS6EF
AF4
AF2
AF1
H
M
L
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1.2.7 Precision Synchronization
The OptiX PTN 950 supports the physical-layer clock synchronization, IEEE 1588 V2 precision
time protocol (PTP), and 1588 adaptive clock recovery (ACR) clock synchronization. With these
clock solutions, the equipment provides high-precision time/clock for the mobilecommunication services.
Physical Layer Clock Synchronization
In the case of the physical layer clock synchronization mechanism, the clock information is
extracted from signals in the physical channel of the transmission link and thus the frequency
synchronization is achieved.
Besides the clock/time interface, the OptiX PTN 950 supports extracting the clock information
from the following transmission links:
l Synchronous Ethernet link
l Channelized STM-1 link
l E1 link
l xDSL Link
NOTE
The NTR clock is a technology used to synchronize the clock at the physical layer. Clock signals are
extracted directly from the serial bit flow on the xDSL link. These clock signals are then used for data
transmission. In this way, the clock signals are transferred.
IEEE 1588 V2
IEEE 1588 V2 is a time synchronization protocol that provides the nanosecond accuracy to meetthe requirements of 3G base stations. The OptiX PTN 950 supports the following features of
IEEE 1588V2:
l The equipment can use the IEEE 1588V2 protocol to achieve the clock timing
synchronization and time information synchronization.
l The equipment supports the boundary clock (BC), ordinary clock (OC), and transparent
clock (TC, including the end-to-end transparent clock and peer-to-peer transparent clock).
The equipment can be configured with different clocks according to the requirement.
l The equipment supports the clock source switching.
IEEE 1588 ACR
IEEE 1588 ACR refers to a process of synchronizing the frequency of the equipment at both
ends of a PSN network. In this process, the master equipment that supports the IEEE 1588 V2
protocol encapsulates the local system clock information into IEEE 1588 V2 packets (also PTP
packets) and transports the packets to a third-party network, which then transparently transports
the packets to the slave equipment opposite to the master equipment. When receiving the packets,
the slave equipment extracts the time stamps from the IEEE 1588 V2 packets and recovers the
clock.
For this clock solution, the intermediate third-party network does not need to support the IEEE
1588 V2 protocol.
The IEEE 1588 V2 clock packets supported by the OptiX PTN equipment are multicast Ethernetpackets. The OptiX PTN equipment on the RNC side adds the time stamps with system
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information to the IEEE 1588 V2 clock packets. Then, on the third-party equipment, the clock
information is multicast to the OptiX PTN equipment on the NodeB side. When receiving the
IEEE 1588 V2 clock packets, the OptiX PTN equipment extracts the time stamps, recovers the
clock by calculation, and uses the clock as the system clock. In addition, the OptiX PTN
equipment transports the clock to NodeB. In this manner, the equipment at both ends of the
network achieves frequency synchronization.
1.2.8 DHCP Relay
The PTN equipment supports the DHCP Relay function, which helps the base stations to
automatically obtain IP addresses.
When a base station is powered on, the base station obtains an IP address by using the DHCP.
The PTN equipment is located on the transport line between the base station and RNC, and relays
the DHCP packets between the base station and RNC. In this manner, the base station can obtain
an IP address.
1.2.9 High Efficiency Tunnel Technology
The OptiX PTN 950 supports kinds of L2 and L3 tunnels to carry services.
For the Tunnel technology supported by the OptiX PTN 950, see Table 1-10.
Table 1-10Tunnel technology supported by the OptiX PTN 950
Tunnel Technology Description
MPLS Tunnel Use the MPLS LSP to carry services.
QinQ Use the QinQ link to carry services.
IP Tunnel Use the IP address instead of the MPLS LSP label.
GRE Tunnel Adds the GRE encapsulation on the base of the IP Tunnel
to enhance security.
1.2.10 Green Network Design for Energy Conservation
The OptiX PTN 950 adopts the energy conservation design and provides the energy conservation
platform, which realizes more efficient energy management and helps reduce OpEx.
Green design of the OptiX PTN 950 hardware: Ports of large capacity are distributed in high
density. This helps reduce the average power consumption by port.
Green design of the OptiX PTN 950 software: When modules are not in use, they are shut down.
This ensures dynamic energy conservation.
Energy Conservation Control
The OptiX PTN 950 performs energy conservation control in the following aspects:
l Shuts down switching ports according to online status of boards on the NE.
l Shuts down ports not in use.
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l Shuts down modules not in use.
Control of Fans
The OptiX PTN 950 controls fans as follows:
l The NE software has the function of controlling the rotating speed of fans.
l The equipment performs stepless adjustment of the rotating speed of fans according to
component temperature.
Query of Power Consumption
The PTN 950 queries power consumption as follows:
l Samples the power consumption of the boards.
l Displays the power consumption of all boards on the equipment and calculates and the
power consumption of the equipment.
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2System StructureAbout This Chapter
The system structure is classified into the software structure and the hardware structure.
2.1 Hardware Structure
The equipment hardware includes the chassis, boards, optical fibers, and cables.
2.2 Software Structure
The equipment software manages, monitors, and controls the NEs. As a communication service
element between the U2000 and boards, the equipment software helps the U2000 to control and
manage the NEs.
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2.1 Hardware Structure
The equipment hardware includes the chassis, boards, optical fibers, and cables.
2.1.1 Chassis
The OptiX PTN 950 is case-shaped for easy deployment.
2.1.2 Boards
Boards are the key hardware components of the equipment.
2.1.1 Chassis
The OptiX PTN 950 is case-shaped for easy deployment.
Figure 2-1shows the appearance of the OptiX PTN 950 equipment.
Figure 2-1Appearance of the OptiX PTN 950
The dimensions of the OptiX PTN 950 are 442 mm (width) x 220 mm (depth) x 2 U (height, 1U = 44.45 mm).
OptiX PTN 950 chassis are classified into two types, that is, DC power-supply chassis and AC
power-supply chassis. In a DC power-supply chassis, the PIU inputs -48 V DC power to the
equipment, or an EPS30-4815AF external AC power supply system inputs 220 V AC power,
and converts the AC power to the DC power, and then outputs the DC power to the equipment.
An AC power-supply chassis uses the APIU to input 220 V AC power. Both DC and AC power
supplies support 1+1 hot backup.
NOTE
When inputting power for the equipment, only the PIU or APIU is applicable.
In an AC power-supply chassis, the APIU uses slots 4 and 6, and the slots for the PIU are covered withfiller panels.
The OptiX PTN 950 can be installed in the following:
l ETSI cabinet (300 mm deep)
l ETSI cabinet (600 mm deep)
l 19 inch cabinet (450 mm deep)
l 19 inch cabinet (600 mm deep)
l Indoor Mini Box (IMB) network box
l Open rack
Figure 2-2shows the slot allocation of the OptiX PTN 950.
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Figure 2-2Slot allocation of the OptiX PTN 950
SLOT 3 (1 Gbit/s) SLOT 4 (1 Gbit/s)
SLOT 1 (2 Gbit/s) SLOT 2 (2 Gbit/s)
SLOT 5 (1 Gbit/s) SLOT 6 (1 Gbit/s)
SLOT 7 SLOT 8SLOT
10
SLOT
9
SLOT
11
2.1.2 Boards
Boards are the key hardware components of the equipment.
Board Description and Valid Slots
Table 2-1shows the boards supported by the OptiX PTN 950 and their valid slots.
Table 2-1Boards supported by the OptiX PTN 950 and their valid slots
Board Name Board Description Valid Slot
CXP System control, switching
and timing board
Slot 7, slot 8
AUXQ Auxiliary board, with 4 x FE
service interfaces
Slots 1-6
EF8T 8 x FE service interface board
(electric interface)
Slots 1-6
EF8F 8 x FE service interface board
(optical interface)
Slots 1-6
EG2 2 x GE service optical
interface board
Slots 1-6
EG4F 4 x GE service optical
interface board
Slots 1-6
TND1ML1 16 x E1 service interfaceboard (75 ohms)
Slots 1-6
TND1ML1A 16 x E1 service interface
board (120 ohms)
Slots 1-6
TND2ML1A 16 x E1 service interface
board (75 ohms)
Slots 1-6
TND2ML1B 16 x E1 service interface
board (120 ohms)
Slots 1-6
MD1A 32 x E1 service interface
board (75 ohms)
Slots 1-6
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Board Name Board Description Valid Slot
MD1B 32 x E1 service interface
board (120 ohms)
Slots 1-6
CD1 1 x channelized STM-1service processing board
Slots 1-6
ADS2A/ADS2B 2 x ADSL2+ interface board Slots 1-6
SHD4 4 x G.SHDSL interface board
(supporting the ATM mode
and EFM mode)
Slots 1-6
SHD4I 4 x G.SHDSL interface board
(supporting the IMA mode)
Slots 1-6
PIU Power board Slot 9, slot 10
APIU AC power interface board Slots 4 and 6
FAN Fan board Slot 11
NOTE
l When housed in slot 1 or slot 2, the EG2 can process 2 x GE signals. When housed in any other slot,
the second port of the EG2 is not available.
l The second port of the CD1 can be used for only the LMSP protection.
l The ADS2A supports the Annex A mode. The ADS2B supports the Annex B mode.
l On one NE, only one AUXQ board can be housed.
lThe APIU houses two slots. Slot 4 and slot 6 house one APIU.
Board Relations
The OptiX PTN 950 uses different boards to achieve various functions.
Figure 2-3shows board relations of the OptiX PTN 950.
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Figure 2-3Board relations of the OptiX PTN 950
Network side
E1
User sideControl and
management
module
Service
processing
and
forwarding
module
Clock module
Power supply
module
PIU/APIU
Heat
dissipation
module FAN
CXP
GEEF8TFE
1.NM network interface
3.Clock interface
4.Time interface5.NM Concatenation interface
1 5432
ADSL2+
G.SHDSL
2.NM serial interface
EF8FFE
6 7 8 9
6.Orderwire interface
7.Synchronous data interface
8.Alarm input interface
9.Alarm output interface
EG2/EG4FGE
EF8T
EF8F
EG2/EG4F
ADS2
SHD4/SHD4I
FE
FE
AUXQFE FE
Channelized
STM-1CD1 Channelized STM-1
CD1
E1ML1/ML1A
/ML1BMD1A/MD1B
E1
ML1/ML1A
/ML1B
MD1A/MD1B
E1
2.2 Software Structure
The equipment software manages, monitors, and controls the NEs. As a communication service
element between the U2000 and boards, the equipment software helps the U2000 to control and
manage the NEs.
The equipment software belongs to the element management layer in the telecommunications
management network (TMN), and provides NE functions, some coordination functions, and
operating system functions at the network element layer. The equipment software uses the data
communication function for the communication between the NE and other parts, including
equipment, the U2000 and other NEs.
Figure 2-4shows the software structure of the OptiX PTN 950.
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Figure 2-4Software structure of the OptiX PTN 950
Configuration module
Software platform
Alarm and performancemanagement
Interface management
DCN
Basic frame
Control module
Hardware drive
Software PlatformThe software platform includes the interface management module, the alarm and performance
management module, and the DCN module.
The interface management module converts commands that have different forms and are
transmitted from terminals of different types into internal commands that are of the same form.
By using the alarm and performance management module, current alarms can be automatically
reported and queried, history alarms can be saved and queried, and events can be reported.
DCN module processes the DCN packets, and provides the communication between the local
NE and other parts, including the U2000 and other NEs.
Control Module
The control module has the following function:
l Provides a uniform static or dynamic MPLS label distribution mechanism.
l Provides the routing protocol and route selecting algorithm that are related to dynamic
service creation.
l Provides the protocol that are related to the neighbor auto-discovery function of the
transport plane.
Configuration ModuleThe configuration module has the following functions:
l Manages configuration of the entire NE, including service management, equipment
management, resource management, and protocol configuration agent.
l Sets and queries attributes of the alarm and performance.
l Queries and automatically reports performance data.
l Suppresses inter-board alarms and queries alarms of specified objects.
l Constantly stores configuration data.
l Processes MPLS packets.
l Provides the QoS function.
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Basic Frame and Hardware Drive
The basic frame and hardware drive provide the basic platform kernel and system support. For
example, the basic frame and hardware drive realize the board management, distributed message
management, and log management.
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3Introduction to ServicesAbout This Chapter
The following describes services of the equipment.
3.1 Service Model
The OptiX PTN 950 adopts the MPLS-based PWE3 model to process Ethernet services, ATM
services, and CES services.
3.2 CES Services
In a packet-based transport network, the CES circuit emulation technology is used to
transparentlytransmit TDM circuit switching data. The OptiX PTN 950 supports emulated
transparent transmission of the TDM E1/Fractional E1 services.
3.3 IMA/ATM Services
The OptiX PTN 950 provides ATM emulation services by means of PWs in the packet-based
transport network. The OptiX PTN 950 can access ATM services directly through the E1/
cSTM-1 interface or by using the IMA technology.
3.4 Ethernet Services
The OptiX PTN 950 provides Ethernet services over the public PSN for customers by using the
L2VPN technology.
3.5 IP over PW
IP over PW services are private line services provided by the PTN equipment. In the case of IP
over PW services, IP packets are encapsulated into PWs for transmission.
OptiX PTN 950 Packet Transport Platform of PTN Series
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3.1 Service ModelThe OptiX PTN 950 adopts the MPLS-based PWE3 model to process Ethernet services, ATM
services, and CES services.
MPLS-Based PWE3 Model
shows the MPLS-based PWE3 service model of the OptiX PTN 950.
On the UNI side, the equipment is connected to the customer edge (CE) to access user services
to the packet switching network (PSN). In the case of the MPLS-based PWE3 model, layers on
the UNI side have the following functions.
l Physical layer
The physical layer provides interfaces to connect transmission media, such as cables or
fibers, to the PTN equipment.
In the direction from the CE to the provider edge (PE), the physical layer processes the
physical signals (electrical or optical signals) transmitted from the user-side equipment,
extracts information from the signals, and then sends the signals to the service interface
layer.
In the PE-to-CE direction, the physical layer receives information transmitted from the
service interface layer, converts the information into signals that can be transmitted over
cables or fibers, and then sends the signals to the user-side equipment through the
physical channel.
l Service interface layer
In the CE-to-PE direction, the service interface layer receives information transmitted
from the physical layer, distinguishes the service types, and sends the information to
the native service process layer for processing.
In the PE-to-CE direction, the service interface layer receives service signals transmitted
from the native service processing layer and sends the signals to the physical layer
through proper physical channels.
l Native service processing layer
The native service processing layer processes different services according to the user
requirements.
On the NNI side, the equipment is connected to the PSN equipment to complete the transmission
of user services in the PSN network. In the service model, layers on the NNI side have the
following functions.
l Emulation service layer
The emulation service layer corresponds to the payload that is to be encapsulated into the
PW. An emulation service corresponds to a PW. The emulation service layer is an abstract
logical layer and no specific operation is performed at this layer.
l PWE3 encapsulation layer
The PWE3 encapsulation layer uses different encapsulation modes for different emulation
services. At the PWE3 encapsulation layer, emulation services are uniformly encapsulated
into PWE3 packets, or different emulation services are decapsulated from PWE3 packets.
l MPLS layer
The MPLS layer includes two MPLS labels:
3 Introduction to Services
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The external MPLS label is a tunnel label, which is used to create and maintain a tunnel
between PEs at two ends of a service. The tunnel crosses an MPLS network to carry
PWs.
The internal MPLS label is a PW label, which identifies a PW in a tunnel.
l Data link layer and physical layer
The data link layer and the physical layer work as the MPLS carrier layer and provide links
for the MPLS layer to transmit data. The OptiX PTN 950 supports the following types of
network-side links.
Ethernet link (FE interface or GE interface)
ML-PPP link (E1 interface)
xDSL link (ADSL/ADSL2+/G.SHDSL)
The forwarder located between the UNI and the NNI mutually forwards the services processed
on the UNI side and the emulation services on the NNI side.
3.2 CES Services
In a packet-based transport network, the CES circuit emulation technology is used to
transparently transmit TDM circuit switching data. The OptiX PTN 950 supports emulated
transparent transmission of the TDM E1/Fractional E1 services.
Application Model
The OptiX PTN 950 can access CES services by using the PWE3 technology.
The CES service mainly applies to the wireless service and the enterprise private line service.
The 2G base station or enterprise private line accesses the OptiX PTN 950 by using the TDMline. The PTN equipment slices and encapsulates the TDM signals into data packets, which are
then transported to the opposite end through the PW in the metropolitan transport network. See
Figure 3-1.
OptiX PTN 950 Packet Transport Platform of PTN Series
Product Description 3 Introduction to Services