an%20honet%20-technical%20manual(v7.11).pdf

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Technical ManualHONET Integrated Services Access Network Table of Contents

Huawei Technologies Proprietary

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Table of Contents

Chapter 1 Overview ....................................................................................................................... 1-1

1.1 Definition ............................................................................................................................1-11.1.1 Access Network (AN) Position in Telecom.............................................................. 1-11.1.2 Definition of AN ....................................................................................................... 1-1

1.2 Functional Models of AN.................................................................................................... 1-21.2.1 User Port Function ..................................................................................................1-31.2.2 Service Port Function .............................................................................................. 1-31.2.3 Core Function .......................................................................................................... 1-41.2.4 Transport Function ..................................................................................................1-41.2.5 AN System Management Function ......................................................................... 1-4

1.3 AN Technologies and Developments ................................................................................1-51.3.1 XDSL Access Technology....................................................................................... 1-51.3.2 Optical Fiber AN Technology .................................................................................. 1-61.3.3 Wireless AN Technology ......................................................................................... 1-7

1.3.4 IP Access Technology............................................................................................. 1-7Chapter 2 System Description ..................................................................................................... 2-1

2.1 HONET Overall Architecture.............................................................................................. 2-12.1.1 OLT.......................................................................................................................... 2-12.1.2 ONU......................................................................................................................... 2-22.1.3 Optical Transmission System.................................................................................. 2-42.1.4 AN-NMS .................................................................................................................. 2-4

2.2 HONET Interfaces.............................................................................................................. 2-52.2.1 UNI .......................................................................................................................... 2-52.2.2 SNI........................................................................................................................... 2-52.2.3 Maintenance Management Interface....................................................................... 2-6

2.3 Services Provisioning......................................................................................................... 2-62.3.1 POTS....................................................................................................................... 2-7

2.3.2 ISDN ........................................................................................................................ 2-72.3.3 DDN Services.......................................................................................................... 2-72.3.4 IP Services .............................................................................................................. 2-72.3.5 Z Interface Extension .............................................................................................. 2-82.3.6 2/4 Line Voice Frequency Interface ........................................................................2-82.3.7 2/4 Line E&M Interface............................................................................................ 2-82.3.8 CATV Services ........................................................................................................ 2-8

2.4 HONET System Features ..................................................................................................2-92.4.1 Multiple Subscriber Interfaces ................................................................................. 2-92.4.2 Intra-Frame Resource Sharing and Adjustable Convergence Ratio....................... 2-92.4.3 Upgrade and Scalability ..........................................................................................2-92.4.4 Flexible Networking ................................................................................................. 2-92.4.5 V5 Interface ...........................................................................................................2-102.4.6 Integrated Access.................................................................................................. 2-10

2.4.7 Powerful Network Management ............................................................................ 2-102.4.8 Reliable System Performance............................................................................... 2-102.4.9 Abundant Product Series ...................................................................................... 2-10

Chapter 3 System Composition ................................................................................................... 3-13.1 Summary............................................................................................................................ 3-1

3.1.1 Introduction to OLT.................................................................................................. 3-13.1.2 Introduction to ONU................................................................................................. 3-1

3.2 Optical Line Terminal (OLT)............................................................................................... 3-3


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3.2.1 Physical Configuration of OLT................................................................................. 3-33.2.2 Composition and Function of Each Module in OLT ................................................ 3-33.2.3 Characteristics of OLT............................................................................................. 3-73.2.4 Description of SIPP Functional Modules................................................................. 3-8

3.3 Optical Network Unit (ONU)............................................................................................... 3-93.3.1 Physical Configurations of ONU.............................................................................. 3-93.3.2 Composition and Function of Each Basic Module in ONU.................................... 3-103.3.3 Characteristics of ONU.......................................................................................... 3-113.3.4 Description of Functional Units.............................................................................. 3-13

Chapter 4 Subscriber Interface and Services Implementation ................................................. 4-14.1 Introduction ........................................................................................................................ 4-14.2 Major Boards and Service Interface Types........................................................................ 4-14.3 POTS Services .................................................................................................................. 4-44.4 ISDN Integrated Services ..................................................................................................4-44.5 Data Services..................................................................................................................... 4-4

4.5.1 Summary................................................................................................................. 4-44.5.2 Implementation of Service Access in HONET......................................................... 4-7

4.6 Internet Services .............................................................................................................. 4-134.6.1 IP Access and LAN Interconnection...................................................................... 4-14

4.6.2 IP Bypass .............................................................................................................. 4-154.7 Z Interface Extension ....................................................................................................... 4-184.7.1 2/4-line VF Private Line Interface .......................................................................... 4-194.7.2 2/4 Line E&M Interface.......................................................................................... 4-20

4.8 CATV Access................................................................................................................... 4-22

Chapter 5 Networking and Application ....................................................................................... 5-15.1 System Networking ............................................................................................................ 5-1

5.1.1 Summary................................................................................................................. 5-15.1.2 SDH Optical Transmission System......................................................................... 5-15.1.3 PON Optical Transmission System......................................................................... 5-4

5.2 Applications........................................................................................................................ 5-75.2.1 Integrated Access Network with Narrow-band/Broadband Services in City A........ 5-75.2.2 DDN Data Service AN in City B .............................................................................. 5-8

5.2.3 AN with Integration of Active/Passive Optical Transmission in City C.................... 5-95.2.4 MML Network Management of Access Network in City D ....................................5-105.2.5 OMC SHELL Centralized Network Management in City E ...................................5-115.2.6 Large-capacity and Highly-integrated AN in City F ............................................... 5-125.2.7 Object-oriented NM in City G ................................................................................5-135.2.8 Q3 NM Access in City H........................................................................................ 5-135.2.9 Local Network with 600 thousand lines in City I.................................................... 5-145.2.10 Local Network with 500 Thousand Lines in City J ..............................................5-16

Chapter 6 Network Management.................................................................................................. 6-16.1 Summary............................................................................................................................ 6-16.2 System Structure ............................................................................................................... 6-26.3 Local End Maintenance Mode ........................................................................................... 6-36.4 Remote Maintenance Mode............................................................................................... 6-7

6.5 Functions and Implementation of NMS............................................................................ 6-106.5.1 Functions ............................................................................................................... 6-106.5.2 Implementation Modes .......................................................................................... 6-27

6.6 DAS Network Management ............................................................................................. 6-346.6.1 System Description ............................................................................................... 6-346.6.2 Separation of Maintenance Authority .................................................................... 6-346.6.3 DAS Network Management Functions .................................................................. 6-34

6.7 External Interfaces ........................................................................................................... 6-356.7.1 Centralized Line Test Interface ............................................................................. 6-35


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6.7.2 MML Interface ....................................................................................................... 6-466.7.3 Q3 Interface........................................................................................................... 6-48

Chapter 7 Technical Specifications ............................................................................................. 7-17.1 Technical Specifications Applied in HONET System......................................................... 7-1

7.1.1 Technical Standards Involved in AN ....................................................................... 7-17.1.2 Specifications for AN Service .................................................................................. 7-1

7.1.3 Specifications for SDH Optical Transmission Equipment ....................................... 7-27.1.4 Specifications for PON Optical Transmission Equipment ....................................... 7-37.1.5 Specifications for Electro-mechanical Area............................................................. 7-3

7.2 Performance Indexes of HONET System.......................................................................... 7-47.2.1 SIPP System Resources and Capacity ................................................................... 7-47.2.2 Technical Indexes of HONET Interfaces................................................................. 7-67.2.3 HONET Electromechanical Indexes...................................................................... 7-347.2.4 HONET Clock System........................................................................................... 7-377.2.5 HONET System Reliability .................................................................................... 7-39

7.3 Indexes of Transmission Technology .............................................................................. 7-397.3.1 Technical Indexes of SDH Optical Transmission Equipment................................ 7-397.3.2 Technical Indexes of HONET-PON16 Optical Transmission Equipment ............. 7-527.3.3 Transmission Indexes for Board-Embedded APDH Optical Transmission

Equipment ......................................................................................................................7-577.3.4 Transmission Indexes of CATV Module................................................................ 7-587.4 Protection Measures and Performance ........................................................................... 7-58

7.4.1 Protection Index of Main Distribution Frame (MDF).............................................. 7-587.4.2 Protection Indexes of Lightning Protection Box ....................................................7-59

7.5 Ground Requirements...................................................................................................... 7-597.6 Estimation of Power Consumption................................................................................... 7-597.7 Indexes of ETS450WLL Wireless Access System .......................................................... 7-60

7.7.1 Frequency Range.................................................................................................. 7-607.7.2 Coverage Area ...................................................................................................... 7-607.7.3 Traffic and Subscriber Capacity ............................................................................ 7-60

7.8 Indexes of ETS1900 Wireless Access System................................................................ 7-617.8.1 Frequency Range.................................................................................................. 7-617.8.2 Coverage Area ...................................................................................................... 7-617.8.3 Traffic and Subscriber Capacity ............................................................................ 7-61

Appendix A Abbreviations............................................................................................................A-1

Appendix B Glossary ....................................................................................................................B-1B.1 112 Test.............................................................................................................................B-1B.2 A ........................................................................................................................................B-1

B.2.1 AN: Access Network ...............................................................................................B-1B.2.2 An: Access Node ....................................................................................................B-2B.2.3 AN-SMF (Access Network - System Management Function).................................B-2B.2.4 AON- All Optical Network........................................................................................B-3B.2.5 ATM (Asynchronous Transfer Mode)......................................................................B-3

B.3 B ........................................................................................................................................B-3B.3.1 BHCA (Busy Hour Call Attempts) ...........................................................................B-3

B.3.2 BORSCHT Functions..............................................................................................B-3B.3.3 Bridge......................................................................................................................B-4

B.4 C ........................................................................................................................................B-4B.4.1 Cable Modem..........................................................................................................B-4B.4.2 Call Loss Ratio........................................................................................................B-5B.4.3 Client/Server ...........................................................................................................B-5

B.5 D ........................................................................................................................................B-5B.5.1 DAS.........................................................................................................................B-5B.5.2 Data Link.................................................................................................................B-6


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B.5.3 DDN ........................................................................................................................B-6B.5.4 Direct Dial-in ...........................................................................................................B-6B.5.5 DLC .........................................................................................................................B-7B.5.6 DSL (Digital Subscriber Line) .................................................................................B-7B.5.7 DTE/DCE/DTE Interface/DCE Interface .................................................................B-9

B.6 E ........................................................................................................................................B-9B.6.1 E&M Signaling ........................................................................................................B-9B.6.2 Erlang......................................................................................................................B-9

B.7 F.......................................................................................................................................B-10B.7.1 FAS (Flexible Access System) .............................................................................B-10B.7.2 Fast Ethernet (100BASE-T)..................................................................................B-10B.7.3 Frame Relay .........................................................................................................B-11B.7.4 FXO (Foreign Exchange Office Interface) ............................................................B-11B.7.5 FXS (Foreign Exchange Subscriber Interface).....................................................B-11

B.8 G ......................................................................................................................................B-11B.8.1 Gateway................................................................................................................B-11

B.9 H ......................................................................................................................................B-12B.9.1 HDLC (High Level Data Link Control)...................................................................B-12B.9.2 HGRP (Huawei General Remote Subscriber Processing) ...................................B-12B.9.3 HONET..................................................................................................................B-12

B.9.4 Hub........................................................................................................................B-13B.10 I......................................................................................................................................B-13

B.10.1 Inter-module Interconnection and Inter-module Cascade ..................................B-13B.10.2 ISDN, N-ISDN and B-ISDN.................................................................................B-13

B.11 L.....................................................................................................................................B-14B.11.1 LAN (Local Area Network) ..................................................................................B-14B.11.2 Local Network .....................................................................................................B-15

B.12 M....................................................................................................................................B-15B.12.1 MML ....................................................................................................................B-15B.12.2 MODEM (Modulator-demodulator) .....................................................................B-15

B.13 N ....................................................................................................................................B-16B.13.1 Narrowband and Broadband...............................................................................B-16B.13.2 NCP.....................................................................................................................B-16

B.13.3 Network Clock/Service Clock/Transmission Clock/ Port Clock ..........................B-16B.13.4 Network Synchronization/Port Synchronization/BIT Synchronization ................B-17B.13.5 Node....................................................................................................................B-17

B.14 O ....................................................................................................................................B-17B.14.1 OMC 2000...........................................................................................................B-17B.14.2 On-line Test ........................................................................................................B-17B.14.3 On-line Upgrade..................................................................................................B-18

B.15 P ....................................................................................................................................B-18B.15.1 PCM (Pulse Code Modulation) ...........................................................................B-18B.15.2 PON ....................................................................................................................B-18

B.16 Q ....................................................................................................................................B-18B.16.1 Q3 Management Interface ..................................................................................B-18

B.17 R ....................................................................................................................................B-19

B.17.1 R Series ONU and V Series ONU ......................................................................B-19B.17.2 Router .................................................................................................................B-19B.17.3 Routine Test........................................................................................................B-19

B.18 S ....................................................................................................................................B-20B.18.1 SDH.....................................................................................................................B-20B.18.2 Server..................................................................................................................B-21B.18.3 SIPP (Service Interface and Protocol Processing Module) ................................B-21B.18.4 SN: Service Node ...............................................................................................B-21B.18.5 SNI: Service Node Interface ...............................................................................B-22B.18.6 SPF: Service Port Function.................................................................................B-22


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B.18.7 Synchronization and Asynchronization...............................................................B-22B.19 T.....................................................................................................................................B-23

B.19.1 TCP/IP Protocol ..................................................................................................B-23B.19.2 Telecommunication Supporting Networks ..........................................................B-23B.19.3 TF: Transport Function .......................................................................................B-23B.19.4 TMN (Telecommunications Management Network) ...........................................B-24B.19.5 TTL Level Interface and Differential Balance Level Interface.............................B-25

B.20 U ....................................................................................................................................B-25B.20.1 UNI: User Network Interface...............................................................................B-25B.20.2 UPF: User Port Function.....................................................................................B-26

B.21 V ....................................................................................................................................B-26B.21.1 V5 Interface.........................................................................................................B-26B.21.2 V.35/V.24/U/E1 ...................................................................................................B-26B.21.3 VC/PVC/SVC/LC.................................................................................................B-27B.21.4 VOD (Video on Demand)....................................................................................B-27

B.22 W ...................................................................................................................................B-27B.22.1 Wide Area Network .............................................................................................B-27

B.23 X ....................................................................................................................................B-28B.23.1 X.25 Protocol ......................................................................................................B-28B.23.2 X.50 Protocol ......................................................................................................B-28

Appendix C HONET Pictures........................................................................................................C-1


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Chapter 1 Overview

1.1 Definition

1.1.1 Access Network (AN) Position in Telecom

In recent years, digital and broadband equipment has been widely used for switching and

transmission. However, the access network becomes the bottleneck of telecom

development due to various reasons. The priority of telecom development is digitalizationand integration of the access network equipment and network optimize.In terms of functions, Telecom consists of switching network, transmission network and

access network. Access network is located at the bottom of the telecom, which provides

basic services for the subscribers. Figure 1-1 shows its position in telecom. AN connectslocal exchange (LE) and the subscribers. It transmits various services to the subscribers

transparently. Entities providing the telecom services are called service node (SN).

Subscribernetwork

Subscribernetwork

Subscriberpremise network

Transmissionnetwork

LEAN ANLE

Subscriberpremise network

Figure 1-1 Position of AN in Telecom

1.1.2 Definition of AN

AN covers all the equipment and transmission media between SN and subscriber

terminal, including subscriber cable, multiplex equipment, digital cross-connectequipment (DXC), user/network interface equipment.Figure 1-2 illustrates the definition of access network. AN consists of a series of entities

between service node interface (SNI) and user network interface (UNI), such as the line

equipment and transmission facilities. AN configuration and management can be madethrough Q3 interface. In principle, there is no limit to type and quantity of UNI and SNI

in AN.


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Access network

ISDN

Leased line

Radio

POTS

UNI Q3

V5.1

V5.2Digital multiplexing

protocol

PAL

SECAM

NTSC

LE

SXC

ATM/IP node

Broadcast

SNI

Video

ATM/IP protocol

ATM/IP service

television

Figure 1-2Schematic diagram of AN

AN can be defined by UNI, SNI and Q3 interface, through which it is connected to other

network entities. User terminal in connected to AN through UNI. AN gets connected tothe SN through SNI. AN and SN get connected to telecom management network (TMN)through Q3 interface. Figure 1-3 shows the relationship among various network entities.

Telecom Management Network (TMN)

Access

Network

(AN)

POTS

ISDN

RadioVideo

LL

UNI

Service

Node(SN)

Q3 Q3

SNI

Figure 1-3Relationship between AN and NE

1.2 Functional Models of AN

As shown in Figure 1-4, AN functions consists of user port function (UPF), core function

(CF), transport function (TF), service port function (SPF) and AN system management

function (AN-SMF). Detailed descriptions of each function are as follow.


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Bearing subscriber and subscriber signalings

Control and management information

UPFUNI

CF

TFCF

SPFSNI

AN-SMF

Q3

Access network

Figure 1-4Functional models of AN

1.2.1 User Port Function

UPF adapts requirement of specific UNI to the CF and SMF. AN supports multiple

access services with specific UNI requirement at the same time. UNI is determined by the

interface regulations and requirements on access capacities, i.e. the specific transmissionprotocols and protocol bearer.UPF include the following.

1) To connect to terminals with UNI.

2) A

D conversion

3) Signaling conversion4) UNI activation/deactivation5) Processing of UNI bearer and UNI capacity6) UNI test7) Control function

1.2.2 Service Port Function

Functions of service interfaces are as follows.1) To connect with the SNI terminal.2) Mapping the bearer and operational requirements, real time acceptance to the

core function.3) Mapping protocols required by a particular SNI.4) To make SNI test.5) To maintain SPF6) To accept and handle services.7) To control services.


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1.2.3 Core Function

Core function (CF) is between UPF and SPF, which maps the services borne by a certain

subscriber port or a service port to that of the common bearer. Its functions include makeadaptation based on certain protocols and processes protocol bearing according to

requirements on transmission and multiplexing. Core functions can be selected depending

on actual needs.Core functions includes the following.

1) Processing access services.2) Concentration of bearer channels.3) Multiplexing of signaling and packet information.4) Circuit emulation of transmission over ATM.5) Management function6) Control function

1.2.4 Transport Function

Transport Function provides channels for the common bearer entities in different

locations of AN and makes adaptation for the related transmission media.Transport functions include the following.

1) Multiplexing function2) Traffic distribution and configuration DXC3) Management function4) Providing physical media

1.2.5 AN System Management Function

Access network system management function refers to the function of configuring andmanaging UPF, SPF, CF and TF in the AN. Its main functions include the following.

1) Configuration and control

2) Provisioning and coordination3) Fault detection and indication4) Collection of operation information and performance data.5) Security control6) Coordination of the operation requirements from SNI and UPF, as well as real

time management on them.7) Resources management

1.3 AN Technologies and Developments

Access technologies include xDSL, optical access, hybrid access, wireless access and IP

access.

1.3.1 XDSL Access Technology

xDSL technology is a digital subscriber technology which transmits digital signals over

the twisted-pair cable. Digital subscriber line technologies can deliver asymmetric or

symmetric rate in the upstream rate and downstream. IDSL, SDSL, HDSL technology

deliver symmetric transmission rate, while ADSL and VDSL deliver asymmetrictransmission rate.


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I. ISDN digital subscriber line (IDSL) technology

Using 2B1Q coding, IDSN provides the subscriber access rate of 64K, 128K and 144K. Itis mainly applied in ISDN voice and data services.

II. High-rate digital subscriber line (HDSL) technology

HDSL technology provides duplex transmission rate of 1.5/2Mbit/s over two or threepairs of twisted-pair cables. Its transmission distance can reach 3~5km over twisted pairswith diameter of 0.4~0.6mm. No repeater is needed. Apart from providing long

transmission distance, HDSL simplifies the equipment installation & maintenance, as

well as networking design. HDSL technology is applicable to PBX network, mobilecommunication base station relay, digital loop system, network interconnection, Internet

server and dedicated digital network.

III. Symmetric digital subscriber line (SDSL) technology

SDSL consists of HDSL, HDSL2, moderate digital subscriber line (MDSL). They are thesame in nature, in that they deliver symmetric transmission rate over a single pair of

twisted-pair cable. SDSL technology has no strict requirement on line quality. It candeliver various rates, including N64K and E1/T1. The subscribers can select the optimalrate according to the true traffic. SDSL is applicable to LAN interconnection, video

conference, E1/T1 dedicated line, SOHO, Internet, interactive multi-media.

IV. Asymmetric Digital Subscriber Line (ADSL) Technology

ADSL technology delivers high-speed asymmetric rate over twisted-pair cable, using

discrete multi-tone (DMT) modulation. ADSL rate reach up to 640kbit/s in

the upstream, and 8Mbit/s in the downstream. G.Lite ADSL rate reach up to 512kbit/s inthe upstream, and 1.536Mbit/s in the downstream. As ADSL is separated from POTS

service in terms of frequency, it wont affect the POTS services. With no need to change

the existing network distribution, ADSL provides the subscribers with services such ashigh-speed Internet access, VOD, video telephone.

V. Very high-rate digital subscriber line (VDSL) technology

VDSL technology advances the transmission distance. The upstream rate and

downstream rate may vary depending on the transmission distance. For example,downstream rate over transmission line of 1000m or 1500m can reach 25Mbit/s, or even

52Mbit/s. Voice signaling and 25/52M digital signaling are both transmitted over the

same twisted-pair cable using frequency division multiplexing (FDM) mode. Theupstream rate can reach 1.6Mbit/s.

VI. Comparison of xDSL Access Technologies

The differences between xDSL access technologies lie in line code, rate and transmission

distance, as shown in Table 1-1:

Table 1-1Comparison of xDSL Access Technologies

Upstream/downstream rateTransmission

distanceModulation Mode Major applications

VDSL 52M/1.6Mbit/s 0.9 QAM HDTV,VR


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ADSL 8M/640kbit/s 5.5 DMT/CAPInternet access, VOD, LANinterconnection

HDSL 1.5-2.048M/1.5-2.048Mbit/s 4.6 2B1QE1/T1 services, WAN or LANaccess

SDSL 1.5-2.048M/1.5-2.048Mbit/s 6.9 2B1Q HDSL applicationIDSL 144k/144kbit/s 5.5 2B1Q ISDN voice and data services

1.3.2 Optical Fiber AN Technology

The future information world requires high-speed access and reliable transmission of

broadband services. Optical fiber AN can overcome the limitations of the copper cableAN and support the future broadband services. FTTx (FTTH / FTTO / FTTZ / FTTB /

FTTC / FTTV) is the trend of AN development.

I. SDH technology

SDH combines the high-speed and large capacity fiber transmission technology with theintelligent Network Element (NE) technology. With the SDH self-healing ring and

ATM/IP exchange, the AN can provide the interactive and distributive services of audio,video and data, It can reasonably distribute the transmission bandwidth and capacityaccording to the requirement, thus realizing broadband access.

II. PON technology

PONPassive Optical Networkuses time division multiplexing (TDM) /TDMA, passive

optical splitting technology, ranging technology, fast synchronization technology and

burst optical/electric technology. It can form multiple networking topologies, includingtree, star and bus. PON system adopts passive optical units, which features network

reliability and cost-effectiveness. Small-capacity PON system is especially applicable to

narrow-band service access in geographically distributed area.

III. Hybrid optical/twisted pair copper cable network

Hybrid optical / twisted pair copper is the most widely used AN, including FTTC, FTTZ

and FTTB. In hybrid optical / twisted pair copper AN, ONU can still be connected with

the subscribers using twisted pair. The restricted transmission distance facilitates the

network construction and modification. The main party of the network used the opticalfiber, thus ensuring large capacity and quality transmission. FTTC, combined with ADSL

and VDSL, provides an economic means for broadband service access. FTTC is an ideal

bridge from coaxial cable network to optical network.

1.3.3 Wireless AN Technology

The wireless AN refers to introduction of wireless transmission media into part or whole

of the AN to provide both fixed and mobile terminal services for subscribers.

I. Fixed wireless access

In the rural areas and community with small amount of residents, using the existing radio

technologies, such as microwave, satellite, cellular and cordless technologies can provide

multiple services flexibly at a lower cost.


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II. Mobile wireless access

Mobile wireless access include GSM, DECT and radio paging system.

1.3.4 IP Access Technology

It is estimated that, in the next decade, the data services all around the world will exceedthe phone services. It changes the telecom globally, and brings some new problems for

Telecom development, esp. the IP services access. It is a challenge for all network

carriers.Compared with the traditional telephone service, IP service has the following features.

1) Longer duration: Generally, the calling time of ordinary telephones is 3~5minutes on average, and 9 minutes during busy hours, while the login time of IPsubscribers is typically 30~50 minutes or even longer. And it is increasing in asustained way.

2) Independent call: Due to the longer duration of IP service, it interferes with thenormal operation of ordinary telephones seriously, and further forces a lot ofsubscribers to use a secondary telephone line.

3) Asymmetry of service amount: According to the statistics, the IP service usedmostly at present includes obtaining of electronic mail news and productinformation, downloading of software and education service. The major featureof this service is the larger amount of downlink service and fewer amount ofuplink service. This point is especially important for the research anddevelopment of IP access system.

IP service subscribers consist of two types generally. One is family users and small

enterprise. The other is large enterprise In terms of access mode, it consists of dial-up

access and dedicated line access. IP access can be enabled through connecting with therouter, through LAN interconnection or VPN. Different access mode requires different

transmission rate.Currently, the commonly used media are the existing twisted pair, the optical fiber or

wireless resource. Different transmission technologies are used for different transmissionmedia. Technologies available in twisted pair include 56K Modem, ISDN and xDSL. For

optical transmission, technologies available include Cable Modem, ATM-PON, built-in

SDH. For wireless transmission, there are mobile wireless access and fixed wirelessaccess. Fixed wireless access means include satellite, wireless cable Modem and LMDS.

Mobile wireless access means include packet switching celluar technology and circuit

switching CDPD technology.Carriers should select the specific IP access technology depending on the network

conditions, service development strategies and subscriber information.


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Table of Contents

Chapter 2 System Description ...................................................................................................... 15

2.1 HONET Overall Architecture............................................................................................... 152.1.1 OLT........................................................................................................................... 152.1.2 ONU.......................................................................................................................... 162.1.3 Optical Transmission System................................................................................... 182.1.4 AN-NMS ................................................................................................................... 18

2.2 HONET Interfaces............................................................................................................... 182.2.1 UNI ........................................................................................................................... 182.2.2 SNI............................................................................................................................ 192.2.3 Maintenance Management Interface........................................................................ 20

2.3 Services Provisioning.......................................................................................................... 202.3.1 POTS........................................................................................................................ 202.3.2 ISDN......................................................................................................................... 202.3.3 DDN Services........................................................................................................... 20

2.3.4 IP Services ............................................................................................................... 212.3.5 Z Interface Extension ............................................................................................... 212.3.6 2/4 Line Voice Frequency Interface ......................................................................... 212.3.7 2/4 Line E&M Interface............................................................................................. 212.3.8 CATV Services ......................................................................................................... 21

2.4 HONET System Features ................................................................................................... 222.4.1 Multiple Subscriber Interfaces.................................................................................. 222.4.2 Intra-Frame Resource Sharing and Adjustable Convergence Ratio........................ 222.4.3 Upgrade and Scalability ........................................................................................... 222.4.4 Flexible Networking .................................................................................................. 222.4.5 V5 Interface .............................................................................................................. 222.4.6 Integrated Access..................................................................................................... 222.4.7 Powerful Network Management ............................................................................... 232.4.8 Reliable System Performance.................................................................................. 232.4.9 Abundant Product Series ......................................................................................... 23


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Chapter 2 System Description

2.1 HONET Overall Architecture

HONET integrated services access network consists of optical line terminal (OLT),

optical network unit (ONU), optical transmission system, AN network management

system (AN-NMS). If ONU in HONET is V-series ONU, OLT may not be necessary.HONET can implement service access, transmission and NM. Figure 2-1 shows HONET

architecture.

PC

LE

OLT

DDN

ONU

ONU

ONU

AN-NMS

Service provisioning AN

Ethernet

64Kbit/s

V.35/V.24

coaxial

E1 dedicated line

Subscriber terminals

TV

2B+D/30B+D

Twistedpair

Router

coaxial

Phone

Figure 2-1HONET overall architecture

2.1.1 OLT

OLT is located in the side of service node.

It is connected to the switch through V5.2 interface. Signaling transfer equipment (STE),which is optional, also exists in the HONET access system. STE is needed when LE does

not provide V5 interface. STE is connected to LE using SS7 and No.1 signaling, and

connected to OLT through V5 interface.OLT gets connected to DDN through E1 interface.

OLT consists of service interface & protocol processing module, optical transmission

module, background management module (BAM). See Figure 2-2.


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Protocolprocessingmodule

BAM

E1LE

V5.2

NM

DDNE1

Serviceinterface&

Opticaltransmission

module

Figure 2-2OLT architecture

Service interface & protocol processing module: this module implements service access.

The services from service nodes are processed by the protocol processing unit and thentransmitted to the user interface. Finally the services are sent to the terminals to finishservice distribution.

Optical transmission module: configuration of this module varies depending on the

optical transmission equipment in it. The built-in transmission equipment may be SDHOptix155/622H and PON-16. Optical transmission module can be in an independent

frame.

BAM: it is embedded in NM interface provided by OLT. BAM consists of the following

optional accessories: an industrial computer, MCP card, multi-serial-port card, networkcard, Modem card. It is the bridge between various service consoles and other equipment

in the HONET system. One BAM occupies a frame in OLT.

2.1.2 ONU

ONU is located at the subscriber side. It provides various service interfaces for telephone,

data communication and video services. ONU is connected to the phones through twisted

pairs. The data services are provided through ISDN 2B+D interface, V.35/V.24

N64kbit/s or subrate interface. In addition, ONU provides 2M dedicated line servicesthrough E1 interface.

Similar to ONU, OLT consists of service interface & protocol processing module, optical

transmission module, power and environment monitoring module. See Figure 2-3.


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Dateterminal

E1

Power and environmentmonitoring module

E1

Phoneterminal

Phoneterminal

protocolprocessingmodule

Opticaltransmissionmodule

Figure 2-3ONU architecture

Service interface & protocol processing module: similar to that in OLT, this moduleconsists of main control unit and subscriber unit. They differ in the fact that main controlunit in ONU use PV8 frame or RSP frame instead of GV5 frame.

When ONU uses PV8 as main control frame, it can get connected to the LE directly

through V5 interface.Optical transmission module: its optional built-in transmission equipment include SDH

Optix155/622H, PON-16, or SDH Optix155C.

Optical transmission module implements the function of multiplex / demultiplex, andoptic/electric conversion. If ONU has a main control unit in its service interface &

protocol processing module, and has the necessity of V5 protocol processing, then the

optical transmission module has to provide E1 channel using V5 protocol.

Power and environment monitoring module: the module accommodate primary power,lightning protection box, battery, MDF and ESC. They are installed in different

functional modules in ONU depending on the actual needs. They do not form an

independent frame. This module monitors and manages environment status of ONU andsystem power supply status.


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Note:

In general, BAM is not needed in ONU. It is managed by BAM in OLT. ONU and OLT communicatewith each other using internal protocol.In cases when V-series ONU is configured in HONET system instead of OLT, a certain ONU isconnected to BAM to implement NM functions.

2.1.3 Optical Transmission System

OLT and ONU, ONU and ONU are connected through optical transmission equipment.The optical transmission equipment can be built-in SDH 155/622H, or other standard

SDH and PDH system. OLT can network with ONU in multiple topological structures,

such as ring, tree, star and link.Transmission module implements the following functions.

1) Bearing V5 links between OLT and LE, or V series ONU and LE.2) Bearing E1 links between main control unit and subscriber unit.

3) Bear broadband services: SDH equipment is used in HONET access system forbearing ATM and IP services.

2.1.4 AN-NMS

AN-NMS is based on TCP/IP protocol. It features client/server structure.

AN-NMS monitors system configuration, maintenance, testing, alarm, performance

statistics collection, wireless management, transmission management, environment powerand CATV. It supports local and remote maintenance, as well as synchronous

maintenance of multiple systems.

Features of AN-NMS are as follows. Comprehensive functions, easy operation and friendly interface.

System secure and configuration flexible Can manage multiple equipment at the same time. Realize distributed and modular management through centralized management. Can be connected to local NM center through standard Q3 interface. Have standard interface for 112 test system. Can manage and maintain various equipment in the access network, such as

subscriber equipment and transmission equipment. Can monitor and manage environment power supply. Can manage data configuration at the subscriber interface. Can manage the whole system running status.

Various of AN-NMS service console, including data console, test console, alarm console,can be installed in one workstation, or multiple workstation in the LAN.

2.2 HONET Interfaces

2.2.1 UNI

ONU in the HONET access network provides UNI for access of multiple services.

Table 2-1 lists different UNIs in HONET system and the terminals which the UNIs are

interconnected to.


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Table 2-1UNI types and the terminals interconnected

Equipment UNI type Interconnected equipment

Z interface PhoneV.35.V.24 Subscriber data terminal

2B+D, 30B+D Digital phone, digital terminal

ONU E1 interfaceU interface transparent transmissionE&M interfaceVF dedicated line

E1 dedicated line

Equipment with U interface at the network sideand subscribe sideE&M trunk equipmentModem with dedicated line, voice frequency phone

2.2.2 SNI

OLT in HONET access network provides SNI. Table 2-2 lists the SNI types and the

terminals interconnected.

Table 2-2SNI types and the terminals interconnected

Equipment SNI type Interconnected equipmentV5.2/V5.1 LE

OLTInterface in 2M dedicated line DDN

I. V5 interface

V5 interface in HONET access network has the following features. Can be interconnected with any switch with standard v5 interface. Reliable. V5 protocol has dual-protection procedures, and signaling links on one

interface are in backup configuration. High maintainability. It can implement local or remote maintenance, monitor in

real time V5 signaling and connection procedures.

Meet the requirement of IP service bypass in the access network.Internet users in the access network can be connected to the ISP directly through

extended V5 interface protocol. It does not occupy service channels in V5 interface, sothat it avoids the impact of increasing Internet users on the network resources.

HONET provides standard V5 interface. It can be connected with switch with standard

V5 interface through the E1 interface in DTE/PV8/PV4 board.

II. DDN interface

Data access system (DAS) in HONET system implements DDN services. Table 2-3 lists

the various service interfaces in DAS.

Table 2-3Data interfaces in DAS

Interface type Rate Features

V.24Subrate (synchronous rate andasynchronous rate), 64kbit/s

In compliance with V.28. V.24.ISO2110(DB25)

V.35 N64kbit/s(N=1~31) In compliance with V.35. V.24.ISO2594(M34)

64kbit/s 64kbit/s In compliance with G.703

FE1 N64kbit/s(N=1~31) In compliance with G.703

2B1Q 160kbit/s In compliance with G.961


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2.2.3 Maintenance Management Interface

HONET access system provides multiple interfaces for comprehensive management and

maintenance, such as GUI NM interface, 112 interface, NML interface and Q3 interface.

2.3 Services Provisioning

As shown in Figure 2-4, HONET access network can be connected with differentsubscriber equipment at the remote end, such as common phone, data terminal, ISDN

terminal, CATV. It implements integration of voice service, data service and video

service.

POTS

ISDN terminal2B+D

TV

CATV

HONET Integrated

Services Access Network

LAN

Router

E1

V.24/V.35

DTE

2B+D/30B+D

2/4-wire VF dedicated line

DDN node

Twistedpair

Coxial cable

PSTN

DDN

ISDN

PSPDN

Internet

10Base-TE/Minterface

G.SHDSL

Figure 2-4Networking diagram of HONET access network

2.3.1 POTS

Apart from supporting analog voice services and service switching, HONET access

network also supports new services, such as Centrex, caller identification display (CID).

2.3.2 ISDN

HONET has ISDN BRA (2B+D) and ISDN PRA (30B+D) interface. It supports N-ISDNservice through 2B+D and 30B+D interface. Multiple rates and multiple bearing channels

can be enabled on 30B+D interface. 30B+D interface in OLT is realized by E1 interface

of DTE digital trunk board. In ONU, 30B+D interface is realized by E1 interface of

PV8/PV4, RSP and optical transmission system.

2.3.3 DDN Services

HONET system provides DDN services. Service interface can be at the rate of

2048kbit/s, N64kbit/s (N=1~31), 2.4/4.8/9.6/19.2kibt/s. Interface types include V.24,V.35, 64k interface, FE1 (fractional E1), 2B1Q interface. By means of 2B1Q interface

technology, the transmission distance can be extended.


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2.3.4 IP Services

HONET provides 10M Ethernet interface, as well as WAN interfaces with dynamic

adjustable bandwidth (N64kbit/s, N in range of 1~31).

2.3.5 Z Interface Extension

Z interface is an analog subscriber interface. Z interface extension service is also called

FXO-FXS service.FXO and FXS interfaces are provided by CDI boardand ASL board respectively.FXO interface is connected with switch to implement connection between POTS

subscriber and LE or PBX.

Z interface extension is applicable for POTS service provisioning when LE/PBX does notprovide V5 interface. It is also applicable for small capacity and low cost of POTS

service provisioning when LE/PBX has V5 interface.

2.3.6 2/4 Line Voice Frequency Interface

VFB board in HONET provides 2/4 line voice frequency interface. VFB voice frequency

dedicated line is applicable for common 2/4 line voice frequency connection and Modem

connection. VFB board has no feeder. The interface impedance is 600and 1650compatible, and the level can be adjusted by software. The interface can be selected

between 2 line and 4 line.

2.3.7 2/4 Line E&M Interface

E&M trunk interface is a widely used trunk interface. Its signaling channel consists of

transmitting M line and receiving E line. It implements signaling conversion between

switch and transmission equipment through E line and M line which are separated fromvoice channel.

2 line E&M interface transmits and receives signaling over one single pair of balanced

line. 4 line E&M interface transmits and receives signaling over one pair of balanced line

respectively.HONET 2/4 line E&M interface belongs to Bell V series. It is provided by ATI board. It

forwards E&M signaling through voice TS using Huawei-defined protocol transparently.

2.3.8 CATV Services

HONET access network provides a cost-effective and flexible transmission solution to

CATV services. Built-in optical transmit module and optical receive module form an

independent CATV optical transmission system. CATV is subject to centralizedmonitoring and network management.


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2.4 HONET System Features

2.4.1 Multiple Subscriber Interfaces

Z interface, U interface (ISDN BRA 2B+D), 2/4 line voice frequency interface, ISDN

PRA (30B+D), V.24 subrate interface, V.24/V.35 64kbit/s interface, V.35/FE1N64kbit/s interface, standard E1 interface, XDSL interface, LAN interface,2/4 lineE&M interface.

2.4.2 Intra-Frame Resource Sharing and Adjustable Convergence Ratio

Network resources of V series ONU can be shared among frames. ONU can b either

connected to LE through V5 interface, or connected to OLT by means of module cascade.

The convergence ratio is in range of 1:1~1:8, which provides a solution to large trafficand traffic unbalanced distribution.

2.4.3 Upgrade and Scalability

Dynamic scalability ensures expansion of system capacity or deletion of certaincomponents without interrupting the normal operations. HONET is of modular structure.

Service types and capacity expansion can be implemented by adding boards, functional

components and stacking protocol processing modules.HONET software patch can be loaded online, which facilitates function optimization. In

addition, software of part of the core boards can be upgraded online. Maintenance staff

can make the operation using MML commands or maintenance console.

2.4.4 Flexible Networking

Network topologies such as link, tree, star and ring are available. The ring networktopology features highly protective function. The built-in SDH optical transmissionequipment facilitates system networking greatly.

HONET module cascade and module interconnection changes the traditional star

topology with OLT in the center. V series ONU can be interconnected with each other

through dedicated line, making service access and networking easier. HONET systemmakes full use of E1 resources, and is especially applicable for situations with large

volume of dedicated line services and complex networking.

2.4.5 V5 Interface

HONET has standard V5 interface in conformance with ITU-T recommendation G.964,

G.965, G.965 supplementary. It can be interconnected with any switch with standard V5

interface.

2.4.6 Integrated Access

HONET supports both cable access and wireless access. There are interfaces in both OLT

and ONU which are connected to wireless local loop system. HONET network system isinteroperable with wireless products by Huawei and products with V5 interface by other


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manufacturers. HONET integrates both passive access technologies and active access

technologies.

2.4.7 Powerful Network Management

HONET NM implements centralized management on fault management, securitymanagement, configuration management and performance management. HONET

systems can be managed and maintained in a unified way. HONET NMS has standard

112 interface, MML interface and Q3 interface for comprehensive subscriber line tests.

2.4.8 Reliable System Performance

All the key components in HONET system, such as the main control board and power

supply board, are in redundancy configuration. If the active board does fail, it would be

replace with a spare. BAM can back up the data automatically and periodically, to ensurethe reliable system performance. HONET access network has an error tolerance module,

which increases the impact of abnormal incidents on the system performance to the

minimum.

2.4.9 Abundant Product Series

HONET access network consists of abundant ONU series products to meet complex

applications and networking requirements. The small capacity equipment includes ONU-60A, ONU-160A, ONU-160B,

ONU-F01A, and ONU-F01D100/200. The medium capacity equipment includesONU-F02A-U and ONU-F01D500/600. The large capacity equipment is ONU-F02A-D, ONU-1000A.

In terms of application environment, there are indoor and outdoor series ofproducts. Outdoor series products are configured with main distribution frame,

power supply and battery. They are especially applicable for applicationswithout normal equipment room. In general, the ONU needs little on-sitemaintenance.

V series of ONU can process V5 protocol directly, and R series ONU onlyprocesses HGRP protocol.


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Chapter 3 System Composition

3.1 Summary

HONET access network consists of optical line terminal (OLT) and optical network unit

(ONU). In terms of service functions, they consist of main control unit and subscriber

unit.

3.1.1 Introduction to OLT

Depending on the cabinet types, OLT can be divided into B-type OLT and 19-inch OLT.

B-type ONU cabinet is usually of combination cabinet, with the dimensions of

2100mm880mm550mm (HWD). The 19-inch cabinet is 2100mm680mm800mm

(HWD), in accordance with the IEC297 standard. Multiple cabinets can be combined

when necessary.OLT is composed of host module (including main control unit or subscriber unit), opticaltransmission module and background administration module (BAM). Figure 3-1 shows

the composition of OLT.

OLT

equipmentHost module

Optical

transmissionmodule

BAM

Main controlunit

Subscriber unit

OptiX 155/622B transmission frame

OptiX 155/622H transmission frame

PON-C transmission unit

PDH transmission frame

GV5 main contrl uit

PV8 main control frame

Figure 3-1Composition of OLT

3.1.2 Introduction to ONU

ONU can be divided into different types, depending on the subscriber quantities andapplications. See Figure 3-2.


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NU

equpipment

ONU-F01D100

ONU-160A

ONU-60A

ONU-F02A

ONU-F01A

ONU-160B

ONU-F01D200

ONU-F01D500

ONU-F01D600

ONU-F01D1000

Figure 3-2ONU classifications

Table 3-1 lists the performance of various ONUs.

Table 3-1List of various ONUs

ONU type Max. subscribers supported ApplicationWith built-in MDF and battery or

not

ONU-60A 64 Indoor NoONU-160A 80/160 Indoor No

ONU-F01A-U 160/320 Indoor Yes

ONU-F02A-U 624 Indoor YesONU-F02A-D 1072 Indoor No

ONU-160B 80/160 Outdoor NoONU-F01D100 160 Outdoor Yes

ONU-F01D200 288 Outdoor Yes

ONU-F01D500 704 Outdoor YesONU-F01D600 896 Outdoor Yes

ONU-F01D1000 1248 Outdoor Yes

Note:

The maximum subscribers refer to the quantities that a single cabinet supports using 16-channelsubscriber board.When using 32-channel subscriber board, ONU-160B can support up to 160 subscribers.

ONU consists of protocol processing module, optical transmission module, power supply& environment monitoring module.

3.2 Optical Line Terminal (OLT)

OLT processes voice, data and video services at the network side. It provides various SNI

to connect with SNs, such as the V5 interface for connecting with LE. OLT is connected

with ONU via one or more than one optical distribution network (ODN). It maintains and

manages ONU. OLT processes protocols in V5 interface, and transmits services to


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various ONUs over ODN. OLT is generally located in the interface of LE. It can also be

placed at remote end to be connected with LE through transmission equipment.

3.2.1 Physical Configuration of OLT

An OLT is composed of the following 4 basic modules: Service Interface and ProtocolProcessing (SIPP) module, optical transmission module, CATV module and back

administrative module (BAM). The basic structure of OLT is shown in Figure 3-3.

CATV moduel

SIPPmodule

Opticaltransmi-

ssion

module

BAM

E1

CATV signal

LE

V5.2

NM

DDNE1

Figure 3-3Basic structure of OLT

3.2.2 Composition and Function of Each Module in OLT

I. Service interface and protocol processing (SIPP) moduleSIPP modulehas the following three functions: service port function (SPF), core function(CF) and user port function (UPF).Figure 3-4 is the functional block diagram of SIPPmodule.

LE Protocol

processing

main

control

unit

Subscriber unit

V5

E1 link transparent

transimission

E1 link

RS422 level

differential link

V5

E1 link or

optical

transmission

DDNE1 link or

optical

transmission

Subscriber unit

Subscriber unit

Figure 3-4Functional block diagram of SIPP module


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In hardware, SIPP module is divided into protocol processing main control unit and

subscriber unit. Protocol processing control unit implements SPF and CF functions, i.e. enabling

service access and distribution, and providing SNI with various SNs. Generally,SN is LE or DDN node. SIPP is connected with LE or DDN node through E1links. Service interconnection is enabled between SIPP and LE through V5

interface. That between DDN node and SIPP is enabled through E1 interface. Itfunctions as SPF in this way.

Subscriber unit mainly performs UPF function to provide subscriber terminalswith various services.

Protocol processing control unit and subscriber unit can be in the same locationor different location. When they are in the same location, they are connectedthrough E1 lines or RS422 links. When they are in the different locations, theyare connected through E1 links provided by transmission equipmenttransparently. Service interconnection between the control unit and subscriberunit is realized by HGRP specified by Huawei.

1) Protocol processing control unit

Protocol processing control unit mainly completes the functions of interface switching,

protocol processing, main control, digital cross connection, clock phase locking and

distribution etc. It is the core part of HONET. Its functional block diagram is shown inFigure 3-5.

E1 interface

E1 interfaceE1 link

E1 link

HGRP or V5

RS422

differentialinterface HGRP

Protocolprocessing

DXC, clockphase lock

& allocation

Management interface

V5

Figure 3-5Functional block diagram of protocol processing control unit

Protocol processing control unit converts E1 signal at LE into the internal signal throughE1 interface, and send the signal to subscriber unit through E1 interface or differential

interface after protocol processing and timeslot cross processing etc. At the same time, it

abstracts the active clock from the network and provides the clock to this unit after phaselocking and completes the transfer of clock through E1 interface and differential

interface. Protocol processing unit provides a management interface, and is subject to the

management of HONET management module.

2) Subscriber UnitThe subscriber unit is divided into the main control part, the subscriber interface part and

the test part. Main control part

The main control part performs the functions of interface signal switching, protocol

processing, equipment management, clock phase locking and distribution etc. Subscriber interface part


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The subscriber interface part is directly connected with the user terminal to provide

various services. Test part

The test part is used for conventional test of subscriber interface so as to guarantee the

stability of the system operation.Services from SN are transmitted to subscriber unit after being processed by main controlunit through E1 or differential signals. Main control part of the subscriber unit converts

the E1 or differential signals into TTL signals, and distributed to subscriber interface

through data bus. Test unit makes normal tests of the subscriber interface, and outputs thetest results to the main control unit through test bus. Figure 3-6 shows the function block

diagram of subscriber unit.

E1link or 422 differential link

Serial data bus

Control bus

Interface functionClock phase and allocation

Equipment managment

Protocol processing

Subscriber cable

Test bus

Testunit

........Subscriberinterface

Subscriberinterface

Subscriberinterface

Subscriberinterface

Subscriber cableSubscriber cableSubscriber cable

Figure 3-6Functional block diagram of the subscriber unit

To sum up, SIPP module is the service-processing core of HONET. It contains the maincontrol unit and subscriber unit, and performs the functions of system control, V5

protocol processing, system timing and user access etc.Specifically speaking, it includes the following types:

Main control unit: GV5 main control frames, and PV8 main control frame(integrating the functions of the main control unit and the subscriber unit).

Subscriber unit: RSP subscriber frame

SIPP in OLT is generally GV5-III frame. They are connected with LE through V5interface, to enable service access and process V5 protocol. When it is necessary for OLT

to provide subscriber interface, subscriber unit, such as RSP subscriber frame, RSAsubscriber frame can be configured. In dedicated network, SIPP can also be PV8 frame.Quantity of the main control frame and ONU subscriber frame can be added according

the requirement.

II. Optical transmission module

Optical transmission module can be embedded with SDH equipment (such asOptix155/622H, Optix155/622B), PON-16 or APDH68M. Components of optical


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transmission module vary with different optical transmission equipment. For detailed

information about the compositions, please refer to the description of respectivetransmission equipment. Optical transmission module can be in an independent frame.

III. CATV module

CATV module is composed of transmitter and receiver sub-modules, monitoring sub-module, CATV power supply, necessary WDM and optical splitter. CATV moduleconverts electrical signals from the broadcast television center into optical signals and

sent them to each ONU through optical fibers. Special CATV optical module completes

single modulation and optical-electric conversion. One CATV module in OLT occupiesone frame.

IV. Back administration module (BAM)

BAM is embedded in OLT to provide NM interface. BAM is composed of an industrial

computer and MCP card, multi-serial port card, network card and MODEM card etc.BAM serves as a bridge between service consoles and system equipment. A BAM

occupies a frame.

3.2.3 Characteristics of OLT

I. Large Capacity

When the GV5-III main control frame is connected with ONU, it can provide services to

10000 subscribers. (calculated on the condition that the traffic of each subscriber line isno less than 0.7 Erl).

II. High Integrity

GV5-III features high integrity and compactness. It uses AV5 board as the main control

board. Each GV5-III frame supports 8 DTE boards, providing 62 E1 links and can bedistributed flexibly. It can provide up to 32 independent V5 interfaces.

III. High Reliability

Active/standby or load-sharing operation mode is adopted for those critical boards, such

as the main control board in OLT and the power board. In case one board is faulty, thesystem can still work normally, which greatly increases the reliability of system

operation.

IV. Modularization

Modularization design is adopted in the system. System capacity can be increased

through adding service boards or superimposing modules.

3.2.4 Description of SIPP Functional Modules

I. GV5 Main Control Frame

GV5 frame implements SPF and CF functions to enable service access and process

protocols. GV5 is installed in OLT, consisting of AV5 main control board, trunk board

and backplane frame. Trunk board has E1 interface to connect with LE or service node. It


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can also be connected with ONU through transparent transmission equipment, to

implement service distribution. AV5 processes V5 protocol, manages and controls thewhole equipment.The GV5 main control frame mainly adopted currently is GV5-III.Figure 3-7 shows the functional block diagram of GV5 main control frame.

A

V

5

A

V

5

Data bus

Control bus

E1

NM serial port

Clock frame

E1 line clock

High-precision clock

LE Subscriber frame

D

TE

D

TE

D

TE

D

T

E

E1E1 E1

Figure 3-7Functional block diagram of GV5 main control frame

One frame of GV5 main control frame is configured with two AV5 boards in

active/standby mode. The active AV5 board monitors DTE boards and the standby AV5

board through control bus, and is subject to the unified management of AN-NMS through

network management serial interface.AV5 uses the line clock extracted from DTE as the system clock in its frame. It provides

DTE E1 links to connect with ONU subscriber frame, functioning as the phase clock

source of ONU subscriber frame. For applications where high-precision clock isdemanded, AV5 board can receive the clock of the optional clock frame.

II. Subscriber Frame

The subscriber frame provides UPF. It consists of main control board, service interface

board, secondary power board and backplane frame. There are different kinds of serviceinterface boards, which provide different service interface. The main control board is

connected the main control frame through E1 interface or RS422 differential interface. It

provides channels for bearing services. The main control board manages service boardsin ONU subscriber frame. It reports the service status to the main control frame, which

then issues operation commands. The subscriber frame communicates with main control

frame through Huawei private protocol HGRP.There are two kinds of subscriber frame, i.e. RSP and RSA. For detailed information

about these frames, refer to the descriptions in ONU Functional Units.


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III. PV8 Main Control Frame

For description of PV8 frame, refer to PV8 Frame in ONU.

3.3 Optical Network Unit (ONU)

ONU is a remote end equipment on the subscriber side in HONET. It processes opticalsignals and provides subscribers with various service interfaces. Optical interface is on its

network side and electrical interface is on the subscriber side. It has the functions of

optical/electrical and electrical/optical conversion, multiplexing and demultiplexing,protocol processing and maintenance management etc. It can perform digital/analog and

analog/digital conversion of voice signal. In addition, it provides optical relay function.

ONU accepts management information from OLT and reports to OLT the variousstatuses of subscribers and equipment through the transmission system.

3.3.1 Physical Configurations of ONU

Similar to OLT, ONU consists of the following modules: Service interface and protocolprocessing (SIPP) module, optical transmission module, CATV module, power and

environment monitoring module. The biggest difference between ONU and OLT is that

ONU is located in the subscriber side. In addition, they are somewhat different inconfigurations of the basic modules. Basic structures of ONU is shown in Figure 3-8.

CATV moduleVideo

terminal

E1

Monitor

Optical

transmi-ssion

module

Power and environment

monitoring module

SIPPmodule

Phone

terminal

Data

terminal

Figure 3-8Basic structures of ONU

3.3.2 Composition and Function of Each Basic Module in ONU

I. SIPP module

Composition of SIPP module in ONU is basically the same as that of OLT. Thedifference is that the main control unit of SIPP in ONU does not have GV5 main control

frame. Instead, it uses PV8 main control frame or RSP subscriber frame to provide the

related subscriber interfaces.When ONU has PV8 frame, it can be directly connected with LE through V5 interface.


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II. Optical transmission module

Similar to the optical transmission module in OLT, ONU can be equipped with built-intransmission equipment (such as SDH Optix155/622H), PON-16, and Optix155C.Components of optical transmission module vary with different optical transmission

equipment. For detailed information about the compositions, please refer to the

description of respective transmission equipment. Optical transmission frame occupiesone separate frame, with the exception of Optix155C which occupies just one slot.The optical transmission module performs the functions of multiplexing, demultiplexingand optical/electrical conversion, and provides E1 channels for the subscriber unit in the

ONU SIPP. When SIPP module in ONU contains the main control unit, and has to be

capable of processing V5 protocol, the optical transmission module have to provide themain control unit with E1 channel with V5 protocol.

III. CATV module

CATV module is composed of transmitter and receiver sub-modules, monitoring sub-

module, CATV power supply, necessary WDM and optical splitter. One CATV module

in OLT occupies a frame. CATV module converts electrical signals from OLT or upper-layer ONU into optical signals and provides subscribers with CATV services through

CAVT distribution network.

IV. Power and environment monitoring module

Power and environment monitoring module includes the primary power, lightningprotection box, battery, MDF and ESC. They are installed in different functional modules

in ONU depending on the actual needs. They do not form an independent frame. Power

and environment monitoring module provides power supply for the syste

an%20honet%20-technical%20manual(v7.11).pdf

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