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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Copyright Huawei Technologies Co., Ltd.

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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

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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


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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

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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

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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


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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

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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.


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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.

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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


Ethernet service

OAM

CC See 5.3 Ethernet Service OAM.

LB

LT


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 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.


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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.


Product Description 3 Introduction to Services

Documents

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