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ZXV10 VCS ZXMVC8900

Product Description

ZXV10 VCS ZXMVC8900 Product Description

ZTE Confidential Proprietary © 2009 ZTE Corporation. All rights reserved. I


Version Date Author Approved By Remarks

2010-10-26 ZTE ZTE

© 2010 ZTE Corporation. All rights reserved.

ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used without the prior written permission of ZTE.

Due to update and improvement of ZTE products and technologies, information in this document is subjected to change without notice.


II © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary

TABLE OF CONTENTS

1 Overview ..................................................................................................................... 1

2 Highlight Features ...................................................................................................... 2

3 Functionality ............................................................................................................... 3 3.1 Applicable Range ......................................................................................................... 3 3.2 Major Functions ........................................................................................................... 4

4 Operating Principles .................................................................................................. 5 4.1 Operating Principles of the Hardware .......................................................................... 5 4.1.1 Operating Principles of the H.320 System ................................................................... 6 4.1.2 Operating Principles of the H.323 System ................................................................... 7 4.2 Operating Principles of the Software ........................................................................... 7

5 Hardware Structure and Configuration .................................................................... 9 5.1 Introduction to the Integrated Equipment .................................................................... 9 5.2 Basic Function Partition ............................................................................................. 10 5.3 Slot Resource ............................................................................................................ 12 5.4 Constituent Units ....................................................................................................... 14 5.5 Board Description ...................................................................................................... 15 5.5.1 Basic Boards .............................................................................................................. 15 5.5.2 H.323 System Boards ................................................................................................ 16 5.5.3 H.320 System Boards ................................................................................................ 16 5.6 System Configuration ................................................................................................ 19 5.6.1 Pure H.323 IP System ............................................................................................... 19 5.6.2 Pure H.320 E1 System or Pure Standard-definition System ..................................... 20 5.6.3 Pure H.320 ISDN PRI System ................................................................................... 21 5.6.4 H.320 ISDN PRI/E1 Hybrid System ........................................................................... 22 5.6.5 H.320 and H.323 Hybrid System ............................................................................... 22 5.6.6 T.120 Data Conference ............................................................................................. 23

6 Networking and Synchronization ........................................................................... 25 6.1 Networking Unit ......................................................................................................... 25 6.1.1 Intelligent Multimedia Server ..................................................................................... 26 6.1.2 Conference Terminal ................................................................................................. 26 6.1.3 GK .............................................................................................................................. 26 6.1.4 Operation Support Layer Server Group ..................................................................... 26 6.2 Networking Application .............................................................................................. 27 6.2.1 Networking by Means of an IP Network .................................................................... 27 6.2.2 Networking by means of a Digital Transmission Network ......................................... 28 6.2.3 Networking by Means of an ISND ............................................................................. 29 6.2.4 Networking with Standard-definition Terminals ......................................................... 29 6.2.5 Hybrid Networking ..................................................................................................... 30 6.3 Clock and Synchronization ........................................................................................ 30 6.3.1 Clock Selection .......................................................................................................... 31 6.3.2 Synchronization Mode ............................................................................................... 31 6.3.3 Principles of Clock Synchronization .......................................................................... 31 6.3.4 Clock Setting .............................................................................................................. 32


ZTE Confidential Proprietary © 2009 ZTE Corporation. All rights reserved. III

7 Technical Specification ........................................................................................... 33 7.1 Technical Procedures ................................................................................................ 33 7.2 Major Technical Indexes ............................................................................................ 34

8 Abbreviations ........................................................................................................... 37


IV © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary

FIGURES

Figure 1 Model Composition Meaning ......................................................................................... 1

Figure 2 Principle Block Diagram of Hardware Functions ........................................................... 5

Figure 3 Operating Principles of the H.320 System ..................................................................... 6

Figure 4 Operating Principles of the H.323 System ..................................................................... 7

Figure 5 Overall Structure and Layer of the Software ................................................................. 8

Figure 6 Appearance of The ZXMVC8900 (Front View) ........................................................... 9

Figure 7 Appearance of the ZXMVC8900 (Back View) ........................................................... 10

Figure 8 Hardware Partitioning Structure (Side View) ............................................................... 11

Figure 9 Schematic Diagram of Slots ........................................................................................ 12

Figure 10 Hierarchy of ZXMS80 (V2.03) ...................................................................................... 25

Figure 11 Networking by Means of an IP Network....................................................................... 27

Figure 12 Networking by Means of the E1 Digital Lines (or DDN) ............................................... 28

Figure 13 Networking Diagram by Means of ISDN ...................................................................... 29

Figure 14 Networking Diagram in Standard-definition System .................................................... 30

TABLES

Table 1 Board Resource Table of Various Board Slots ............................................................ 13

Table 2 Resource Allocation Table of Typical Board Slots ....................................................... 13

Table 3 Single-frame Board Configuration of Pure IP System ................................................. 19


Table 5 Single-frame Board Configuration of Pure E1 or Pure Standard-definition System .... 21


Table 7 Typical Configuration of the E1/IP Hybrid System ....................................................... 22

Table 8 Configuration Example of T.120 Conference .............................................................. 23

Table 9 Abbreviations ............................................................................................................... 37


ZTE Confidential Proprietary © 2010 ZTE Corporation. All rights reserved. 1

1 Overview

With the rapid development of the multimedia communication and network technologies and wide application of the IP network, audio-visual multimedia services over the IP network have become the urgent need of enterprises and telecom operators. As a leading company in developing the videoconference in China, ZTE CORPORATION has in time launched the ZXMVC8900 intelligent multimedia server. Its convenient, flexible access/networking modes, and its series product design provide users at various levels with complete solutions to the videoconference system. Thus, it satisfies user’s application requirements on different occasions.

The ZXMVC8900 is an intelligent multimedia server based on the H.323 and H.320 series protocols, which is located at the core of the videoconference system. It provides effective video, audio and data communication for users with different network types, bandwidths or terminal types.

The specific meaning of ZXMVC8900 (V3.30) is shown in Figure 1:

Figure 1 Model Composition Meaning

ZX M V C 8900 (V3.30)

Product version No.

Product serial No.

Conference

Video

Multi-point

ZTE


2 © 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary

2 Highlight Features

Complies with the ITU-T videoconference series of protocols.

Supports complete interworking and compelled control with the videoconference

equipment by other manufacturers that meets the international standards.

Provides 3 clock selections: BITS clock, LINE clock and internal clock.

In the single E1 system, 96 terminals or 24 8M standard-definition videoconference

terminals can be access. In the single ISDN system, 120 terminals with their rates

less than or equal to 512kbit/s can be accessed. In the single IP system, 512

2Mkbit/s terminals can be accessed.

Supports up to 48 groups of conferences.

Supports flexible call modes. After a conference has started, ZXMVC8900 can

initiate calls to a terminal in the caller mode, or automatically calls all the terminals

in the trunking call mode. Or ZXMVC8900 waits for the terminals to call in the called

mode.

Through the conference reservation function, ZXMVC8900 can restrict the

maximum number of terminals participating in the conference and the maximum

duration of the conference. Moreover, the user can decide whether to hold the

conference as planned or immediately.

Creates a conference by means of WEB reservation or active calling of a terminal.

Supports hybrid networking with E1 terminals, IP terminals and standard-definition

terminals, and supports the active/standby and 3-level cascade modes.

The chassis is structurally a desktop type. Meanwhile, ZXMVC8900 is compatible

with a chassis like a plug-in frame. That is, a desktop chassis whose left and right

side boards have been disassembled can be used as a plug-in frame and put into a

standard 19-inch rack.

Hardware and software employ modular design, and have superior module

compatibility and scalability.

Simple in operations. Supports remote operations and provides enormous interface

diagnosis information and debugging logs. Capable of hardware diagnosis and

remote download.



3 Functionality

3.1 Applicable Range

The major applicable range of the ZXMVC8900 is as follows:

Teleconference: Government agencies and enterprises can hold conferences using

the videoconference system.

Management and supervision application: The enterprise superintendent can use

videoconferences to manage and control the branches of the company located in

different places. Moreover, data conference function also ensures sufficient

exchange of information and viewpoints.

Dedicated network dispatching/management: Railway, aviation and power

management departments may establish 3-level automatic network for the purpose

of monitoring and management.

Product sales and promotion: With the videoconference system, sales departments

may demonstrate and promote new products rapidly all over the country and the

world, and the face-to-face communication saves time and costs.

Teleeducation and training: With the videoconference system, an enterprise may

train its staff members in different branches and locations, and a school may give

lectures or lessons to different residential areas or related institutions.

Cooperative work: With the videoconference, cross-company and cross-school

cooperation plans can be jointly discussed and designed, and pictures and

documents can be transmitted simultaneously. That is the so-called Computer

Support Cooperative Work (CSCW) or GroupWare.

Project development and maintenance: With the videoconference system, senior

engineers may remotely guide the engineering personnel or take emergency

measures to handle accidents.

Business TV (BTV): Provides the point-to-multipoint video broadcast service for

entertainment and commercial advertisements. The hotel industry and cable TV

network users will be the first users of BTV.

Security monitoring system: Remote monitoring of the security monitoring system

can be carried out through the videoconference system. In this way, continuous

monitoring is available without attendance of special persons, thus reducing the

cost considerably. The safety monitoring system can be widely applied in parking



lots, commercial centers, supermarkets, assembly rooms, corridors, entrances and

other critical places.

Remote financing system: The remote financing system in the videoconference

system enables financial institutions to provide efficient customized services for

customers and agents. This also saves time and money.

Telemedicine: With the videoconference system, a hospital may carry out

telemedicine for those patients in remote places.

3.2 Major Functions

The major functions of the ZXMVC8900 are as follows:

Provides unified platform protocol matching and embedded media gateway.

Provides a variety of continuous presence display modes.

Supports MCU 3-level cascade (E1 or IP mode).

Provides multiple cascade interfaces and supports the multiple-group cascade

conference.

Supports the match of 5 rates for a single module. More matching requirements can

be met if more modules are added.

Supports the Voice Control (VC) function, Director Control (DC) function and

Chairman Control (CC) function.

Supports multiple audio processing functions, such as audio mixing and mute.

Supports the remote camera control and achieve compelled control between the

H.320 and H.323 systems.

Provides enormous NM interface information and integrates itself in the unified

network management system.

Supports the T.120 data conference and cascade function, and such functions as

electronic white board, application sharing and file transfer;

Supports interworking between the T.120 data conferences under the H.320 and

H.323 systems.



4 Operating Principles

The hardware system and background control software of the ZXMVC8900 are completely isolated from each other. The hardware system is designed according to the modular design principle, and the software system is designed according to the hierarchical design plan. This chapter describes the operating principles of the ZXMVC8900 in terms of its hardware and software. In addition, it provides some brief descriptions of major protocols involved.

4.1 Operating Principles of the Hardware

The hardware of the ZXMVC8900 system follows the modular design principle. The principle block diagram for the hardware functions is shown in Figure 2. All the functional modules of the ZXMVC8900 are relatively independent of each other.

This modular design enables the same protocol processing unit to process different interfaces and the media processing unit to process media data of different communication protocols. Therefore, for different modes of access, the media data are unified within the system.

Figure 2 Principle Block Diagram of Hardware Functions

H3

20/H

32

3 p

roto

col p

roce

ssing

mo

dule

Voice process ing

module

Image process ing

module

Data processing

module

Interfac

e mo

du

le

ISDN protocolprocess ing

module

MPU

The major functions of each functional module are as follows:

Interface module: Responsible for physical access of E1, PRI and LAN, and

capable of detection.

ISDN protocol processing module: Responsible for call processing of Q.931 and

Q.921 user signaling, binding and synchronization of multiple B-channels.



H.320 and H.323 protocol processing modules: Data multiplexing/demultipelxing,

control of media switching network and detection of hardware status.

Main Control Unit: Centralized control of system resource. Responsible for system

resource configuration and system hardware management coordination.

Voice processing module: Voice coding/decoding, mixing and voice-activated

algorithm.

Image processing module: Visual image continuous presence, rate matching and

image gateway.

Data processing unit: Data processing for T.120 conferences.

4.1.1 Operating Principles of the H.320 System

The ZXMVC8900 applied in the H.320 system has its operating principles as shown in Figure 3.

Figure 3 Operating Principles of the H.320 System

B-ch

annel p

rocessing u

nit

Voice processing

module

Image processing

module

Data processing

module

Interface m

odule

ISDNprotoco l

processing mod ule

MPU

For the H.320 E1 system, the interface code stream reaches the B-channel processing unit via the interface board. Then, the media code stream is multiplexed/demultiplexed at the B-channel processing unit. The demultiplexed media data are sent to different media processing units for processing; while part of the demultiplexed signaling is sent to the protocol stack for processing. The signaling sent from the background and the data processed at the media processing unit are sent to at the B-channel processing unit and then multiplexed there. Finally, the multiplexed data are sent to the interface board for transmission.

For an PRI interface in the H.320 system, its operating principles are basically the same as those when the E1 interface is processed. The only difference is that an ISDN protocol processing unit is added between the interface board and the B-channel



processing unit. The ISDN protocol processing unit aligns D-channel and B channel. In this way, the code stream reaching the B-channel processing unit is the same as that in the leased line system.

The media processing part includes various media processing units, such as the voice processing unit, image processing unit and data processing unit, which process respectively voices, images and data.

4.1.2 Operating Principles of the H.323 System

The ZXMVC8900 applied in the H.323 system has its operating principles as shown in Figure 4:

Figure 4 Operating Principles of the H.323 System

LA

N p

roto

col p

roce

ssing

mo

dule

Voice process ing

module

Image process ing

module

Data processing

unit

MPU

The way such media as voice, image and data are processed in the H.323 system is similar to that in the H.320 system. The difference is that an LAN interface is adopted and protocol processing is directed at IP, UDP and RTP/RTCP.

Either in the H.320 or H.323 system, the interfaces of the media processing parts are unified for complete capability of the system. Media processing supports the functions of matching and conversion of the inter-system voice, image and data based on different media coding/decoding formats.

4.2 Operating Principles of the Software

The ZXMVC8900 system software is composed of 3 layers: MC Multipoint Control Layer, MP Main Control Unit Layer and protocol media processing layer. The overall structure of the software is shown in Figure 5:



Figure 5 Overall Structure and Layer of the Software

Multipoint Control Lay er

MP Main Co ntro l Unit Lay er

Protocol media layer

The 1st

layer

The 2nd

layer

The 3rd

layer

Upper layer

software

Lower layer

software

The major functions of each layer are as follows:

MC multipoint control layer: It is the protocol layer, which supports the H.320 and

H.323 control protocols, multipoint conference control, and organization and

management of multiple groups of conferences.

MP main control module layer: It is responsible for the system resources allocation,

inter-board connection control, transmission and processing of the control

information.

Protocol media processing layer: Lower layer media processing, media

encapsulation protocol processing, media switching/mixing and format conversion.

MC interacts with the Conference Scheduling System (CSS), Authentication, Authorization and Accounting System (AAA) and GK in ZXMS80 (V2.03) to exchange information with the network management system, conference management system, AAA system and GK. Meanwhile, MC transmits message control MP. MC and MP are separately designed. The system expansion can be achieved and the signaling and media can be actually separated from each other through network interconnection. The media processing part contains 14 functional modules: interface board control module, ISDN signaling module, ISO13871 processing module, board control information processing module, H.320 protocol processing module, TCP/UDP processing module, RTP/RTCP processing module, voice decoding module, voice coding module, voice mixing module, video matching module, digital continuous presence processing module, standard-definition media processing module and data processing unit.



5 Hardware Structure and Configuration

Starting from the integrated equipment, this chapter introduces system partitions to describe the basic hardware architecture of The ZXMVC8900 . In addition, it describes the roles and functions of each component in the system by introducing the system units and various boards. This manual also provides the typical configurations of the system in different networking environments so that users understand the equipment more easily.

5.1 Introduction to the Integrated Equipment

The appearance of the ZXMVC8900 equipment is shown in Figure 6.

Figure 6 Appearance of The ZXMVC8900 (Front View)

The ZXMVC8900 is pleasing to the eye. In its front, 17 functional boards with the same appearance are arranged regularly. The standard 19-inch plug-in frame is adopted and the basic structure of the equipment is a single frame. In normal cases, the ZXMVC8900 is placed independently as a desktop chassis.

The back of the ZXMVC8900 is shown in Figure 7:



Figure 7 Appearance of the ZXMVC8900 (Back View)

All the connection cables of the ZXMVC8900 are connected from the equipment back. Corresponding to the functional boards in the front, the back is equipped with the conversion boards and interface adaptors, which are responsible for the external connections of the ZXMVC8900 .

The ZXMVC8900 can also be extended as a multi-layer rack, in which the frames communicate with each other through an extension board. It is used for interface extension and media processing, which provides the high-capacity digital continuous presence processing and capability adaptation functions, thus supporting the access of various terminals during the operation.

This chapter introduces a single-frame the ZXMVC8900 alone.

5.2 Basic Function Partition

The whole chassis of the ZXMVC8900 adopts modular design and can be classified as 5 functional module areas: MC plug-in unit area, power and fan plug-in unit area, conversion board area, interface adaptation board area and functional board area.

The MC plug-in unit area is located at the top of the chassis while the power and fan plug-in unit is located at the bottom of the chassis. In Figure 6, they are respectively covered by the top and bottom cover plates of the chassis. In Figure 7, from the above, we can see the power switch and external interface of the MC plug-in unit area; from the bottom, we can see the main switch of the power module in the power and fan plug-in unit area.



The conversion board area, interface adaptation area and functional board area are at the center of the chassis. The functional boards are located in the front of the chassis while the conversion board area and interface adaptation area are at the back of the chassis. In Figure 6, the central position is the functional board area. In Figure 7, we can see the conversion board area and interface adaptation area: The interface adaptation area is at the upper position while the conversion board area is at the lower position. The board slots of the conversion board area and interface adaptation area correspond to the functional boards. They share the same backplane (BACKB) with the functional board area for communication between the boards.

Figure 8 is the side view of the ZXMVC8900 , from which we can clearly see the basic hardware architecture of the equipment.

Figure 8 Hardware Partitioning Structure (Side View)

MC plug-in unit area

Power and fan plug-in

unit area

Interface

adaptation area

Convers ion

board area

Functional

board area

Chass is

front

Chass is

back

MC plug-in unit area

The MC plug-in unit area is located at the top of the chassis and includes 2 completely same parts. It is composed of embedded equipment servers.

Functional board area

The functional board area has altogether 17 slots, which are numbered 0~16. It is stipulated that lots 0 and 1 should be configured with Main Processing Units (MPUs) and that the other 15 slots configured at will. However, the boards to be configured should be subject to the following two restrictions:

Socket resource in the functional board area on the backplane.

Socket resource in the conversion adaptation board area on the backplane.



Interface adaptation board area

The interface adaptation board area is used to configure the interface adaptor. The interface adaptors correspond to the functional boards at the slots at the front of the chassis in a one-to-one manner. They provide external interfaces for the system to achieve the connection between the equipment and outside.

Conversion board area

The conversion board area is used to configure the conversion board. The conversion board is a bit smaller than the interface adaptor, but similar in its function to the latter. It is required that the conversion board to be configured correspond to the functional boards at the front of the chassis.

The cabling of the interface adaptor and conversion board can be conducted at the back of the chassis. This facilitates the normative installation and ensures the integral beauty of the equipment.

Power and fan plug-in unit area

The power and fan plug-in unit area is composed of the power module and fan.

Different from the traditional MCU, the ZXMVC8900 can work like a switch round-the-clock. The fan design gives full consideration to the short-pass problem of the air duct and this ensures the perfect heat dissipation of the whole equipment. In addition, for the sake of the user’s routine maintenance, the dust screen of the equipment fan can be assembled/disassembled conveniently, which makes it easy to clear it.

The ZXMVC8900 uses external 220V AC power supply and its embedded power module is responsible for the AC-DC conversion. The power module provides the system with 12V, 5V and 3.3V DC voltages and powers the MC plug-in unit area and all the board areas, including the functional board area, interface adaptation board area and conversion board area. the ZXMVC8900 is equipped with redundant power supply composed of 2 power modules. When they work in combination, they employ the mode of load sharing. If either of them is becomes faulty, the other one will support the whole system and give a buzzing alarm to remind the user of eliminating faults.

5.3 Slot Resource

The ZXMVC8900 has altogether 17 board slots, which are numbered, from left to right, 0~16, and are shown in Figure 9.

Figure 9 Schematic Diagram of Slots

9 10 11 12 13 14 1581 2 3 4 5 6 7 160



Note: The numbers in the figure represent the slot numbers. This figure is the front view of the ZXMVC8900 .

Slots 0 and 1 are configured with 2 MPUs working in backup mode. The remaining 15 slots can be configured with any functional board as long as the sockets needed have been installed on the backplane. For the sake of utilization of the equipment resource to the greatest extent, the backplane of the ZXMVC8900 is equipped with some sockets. The board resource of various board slots is shown in Table 1.

Table 1 Board Resource Table of Various Board Slots

Slot No. Board Types Supported

0 MPU

1 MPU

2 APUMIX DPU EAPU N16E1

3 APU EAPU

4 APU EAPU

5 APU EAPU

6 APU EAPU BPU IPU

7 APU EAPU BPU IPU

8 (E)APU DPU NILAN/ENIL BPU IPU

9~16 (E)APU DPU NILAN/ENIL (E)VPU N16E1 HP(M)U HDPU

Generally, MPU is configured at No. 1 slot, APUMIX/EAPU is configured at No. 2 slot, APU/EAPU is configured at Slots 3~5, BPU is configured at Slots 6~8, IPU is configured at Slot 8, VPU/EVPU/HDPU is configured at Slot 9, HPU is configured at Slot 10, DPU is configured at Slots 9~10, both N16E1 and NILAN/ELAN are configured at Slots 9~16. Besides, they should be configured as separately from each other as possible, as shown in Table 2.

Table 2 Resource Allocation Table of Typical Board Slots

M

P

U

M

P

U

A

P

U

M

I

X

/

E

A

P

U

A

P

U

/

E

A

P

U

A

P

U

/

E

A

P

U

A

P

U

/

E

A

P

U

B

P

U

B

P

U

I

P

U

/

B

P

U

V

P

U

/

E

V

P

U

/

H

D

P

U

H

P

U

/

D

P

U

N16E1/NILAN/ENIL. It is recommended that a slot with a larger number should be configured first

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16



5.4 Constituent Units

According to different roles and functions, the ZXMVC8900 contains the following 10 constituent units. Each unit is composed of different boards, which jointly perform various system functions.

MC multipoint control unit: Composed of embedded motherboards and hard disk,

and performing the function of conference multipoint control.

MP main control unit: Composed of the MPU, CC and A2LAN, providing the system

clock and implementing multipoint conference processing, control and management

of various boards.

Audio processing unit: Composed of the APU and MIX or only EAPU, providing the

functions of audio coding/decoding and voice mixing/switching.

Note:

The above three units are mandatory for the ZXMVC8900 .

LAN interface unit: Composed of NILAN and A2LAN, or ENIL and A2LAN, being the

IP network interface unit of the ZXMVC8900 .

When the IP networking is adopted, the LAN interface unit is mandatory for the ZXMVC8900 .

E1 interface unit: Composed of the N16E1, A16E1 and L16E1, serving as the E1

network interface unit of the ZXMVC8900 .

When a digital transmission network or ISDN PRI interface is used for networking, the E1 interface is mandatory for the ZXMVC8900 .

Video processing unit: Composed of VPU/EVPU/HDPU and AVO and performing

the following 4 functions——Gateway function, continuous presence back

transmission function, rate matching, rate matching function and common image

console function of H.320 and H.323.

If a conference requires that the ZXMVC8900 should implement the above functions, the video processing unit is mandatory for the ZXMVC8900 .

Data processing unit: Composed of DPU and A2LAN and performing data

processing function of T.120 data conferences.

If a T.120 data conference including H.320 will be held, the data processing unit is mandatory for the ZXMVC8900 .

Standard-definition processing unit: Composed of HPU and HPA1. This implements

the gateway function between the H.320 standard-definition system and the H.323

system, or that between the H.320 standard-definition system and the H.320E1

system. HMU standard-definition image/voice monitoring unit may implement



centralized monitoring of images and voice of standard-definition terminals in the

equipment.

In case hybrid networking of standard-definition terminals and IP terminals, the standard-definition processing unit is mandatory for the ZXMVC8900 .

ISDN protocol processing unit: Composed of IPU and DSP array module M8DSP,

responsible for ISDN signaling processing.

When the ISDN is used for networking, the ISDN protocol processing unit is mandatory for the ZXMVC8900 .

B-channel processing unit: Composed of the BPU and DSP array module M8DSP,

implementing B-channel processing in the H.320 system, that is,

multiplexing/demultiplexing of the H.221 frame. It disassembles the channel data

packets from the E1 interface unit or ISDN protocol processing unit into images,

voice and data signals, and sends them respectively to the video processing unit,

audio processing unit and data processing unit. Meanwhile, the B-channel

processing unit bundles the processed video, audio and data signals into a packet

and sends them back to the E1 interface unit or ISDN protocol processing unit.

If the system is applied in the H.320 network environment, the B-channel processing unit is mandatory for the ZXMVC8900 .

5.5 Board Description

There are many types of boards for the ZXMVC8900 . Different boards can be selected to meet the requirements of different networking environments and conferences.

5.5.1 Basic Boards

In any networking environment, the following boards are mandatory for the ZXMVC8900 :

MPU: Main Processing Unit, responsible for the multipoint conference, control and

management of various boards so that they can work as instructed by the NMC. the

ZXMVC8900 may have one or two MPUs. When 2 MPUs are configured, they

work in mutual hot standby mode.

CC: Clock Card, which extracts line clock and the BITS clock or provides the

system clock for the conference network. The crystal oscillator of CC may generate

an internal clock of the system and BITS clock can be extracted from an external

interface. The CC provides two external interfaces. If the BITS clock uses the

balanced access mode, the system will use the lower RJ45 interface; if it uses the

non-balanced access mode, the system will use the upper coaxial interface.

A2LAN: LAN adaptor card, providing two 10/100BASE-T interfaces and supporting

UTP5 network cable connection. Generally, the system is configured with multiple

A2LANs to provide network interfaces for the NILAN/ENIL, MPU and DPU.



APU: Audio coding/decoding unit, performing the 32-channel voice

coding/decoding. EAPU: Audio coding/decoding unit, performing the 128-channel

voice coding/decoding and mixing.

MIX: Mixing processing unit, performing the function of mixing processing of 256-

channel audio signals. Voice signals reach APU by means of NILAN (or BPU) and

are decoded there. Then, they are sent to MIX, where they are mixed. After that,

they return to APU, where they are recoded, and then are sent back to NILAN or

BPU. MIX is generally configured on a certain APU and the APU configured with

MIX is also called APUMIX.

5.5.2 H.323 System Boards

NILAN/ENIL are used when the ZXMVC8900 is applied in the IP network environment. The system can be configured with up to 8 NILANs or up to 6 ENILs or up to 3 ELANs.

NILAN,ENIL and ELAN are LAN interfaces with the conference rate access capabilities of 64kbit/s~8Mbit/s. The processing capacity of NILAN is 16×384K, the capacity of ENIL is up to 86×2M,and the capacity of ENIL is up to 96×2M . The conference information of the IP terminal is sent to the ZXMVC8900 through this board for the processing of various types of media information, and the processed information is then sent back to the terminal through this interface board.

ELAN capacity:

The capacity of ENPU_ELAN is 6 times of ENIL, its board can connect 96 2M IP terminals. With full confirmation of ENPU_ELAN in 24 bus MCU, it allows the connection of 256 2M IP terminals.

Since 1 ENPU is made of 4 DSP, and each DSP can be independently configured as ELAN/ESTB/ESPU, so one ELAN unit has the following capacity:

48x 1M IP terminal access, with total bandwidth of 48M




When mixing 1M, 2M, 4M, 8M, the number of access needs to satisfy x*1M + y*2M

+ z*4M + k*8M <= 48M.

5.5.3 H.320 System Boards

The following boards are used when the ZXMVC8900 is applied in the H.320 system.



BPU: B-channel protocol processing unit, which works together with M8DSP to

implement H.320 protocol processing. It has the function of 32-channel E1 or 64-

channel ISDN processing.

M8DSP: DSP array module, a small board which is bound on BPU and implements

B-channel processing function together with BPU. Meanwhile, this board, together

with other boards, performs system functions needed.

The BPU and the M8DSP jointly implements the function of H.320 protocol processing. It conducts the H.221 and H.242 processing of 32 leased line terminals. It sends the images, voice and data from the E1 interface board or IPU protocol processing unit to such boards as the APU, DPU and VPU for processing of various types of media information. Then, it sends the processed information streams back to the E1 interface board or IPU protocol processing unit.

Both the BPU and M8DSP are mandatory when the ZXMVC8900 is applied in the H.320 system.

5.5.3.1 E1 Network Board

The N16E1, A16E1 and L16E1 are used when the ZXMVC8900 is applied in the E1 network environment. The system can be configured with a maximum of 6 N16E1s, 6 A16E1s and 6 L16E1s (configured together).

N16E1: E1 interface board, capable of processing the 16-channel E1/PRI. The

conference signal of the E1 terminal is sent to the BPU through this board for the

processing of various types of media information. The processed information is sent

back to the terminal through this interface board, too.

A16E1: E1 interface adaptor, which does not process conference information, but

provides 16 E1 interfaces for the E1 terminal/standard-definition terminal in place of

the N16E1. The ports are defined according to the slot ID and port ID. The slot ID is

the slot number corresponding to the N16E1. The slot IDs are 0~15 from top down.

L16E1: E1 interface channel indication board, displaying the result after the system

has detected the 16 E1 interfaces on the A16E1. It provides 16-channel E1/PRI

status indication. The 16 indicators correspond to the 16 E1 interfaces at the A16E1

respectively.

5.5.3.2 ISDN Board

The board when the ZXMVC8900 is applied in the ISDN environment. Besides the boards when the ZXMVC8900 is applied in the E1 network environment, one IPU is needed.

IPU: ISDN protocol processing, used to bind and align the data from multiple digital channels (multiple B-channels) from the physical interface (N16E1), and then send them to BPU for processing. In reverse direction, IPU transparently switches the data from BPU and sends them to the physical interface. Meanwhile, IPU is responsible for ISDN signaling processing.



5.5.3.3 Standard-definition Board

The HMU, HPU and HPA1 are used when the ZXMVC8900 is applied in the standard-definition system.

HMU: Standard-definition image/voice monitoring unit, responsible for centralized

monitoring of images/voice of the standard-definition terminals in the equipment.

Together with 8 ZXMVC6000Ms, HMU monitors the images and voice of 8-channel

standard-definition terminals.

HPU: Standard-definition processing unit, which performs the gateway functions of

the H.320 standard-definition system and H.323 system. It is responsible for packet

assembly and disassembly of MPEG-2 protocol code streams. This board can be

configured as that for 4 software purposes, HPU/MHPU/GHPU/PHPU.

HPU: 1-channel standard-definition gateway +1-channel standard-definition matching +7-channel standard-definition image console

MHPU: 9-channel standard-definition image console

PHPU: 2-channel standard-definition matching +7-channel standard-definition image console

GHPU: 2-channel standard-definition gateway + 7-channel standard-definition image console

HPA1: Standard-definition process interface adaptor 1, which provides 9-channel of

standard-definition code stream output and 2-channel standard-definition code

stream input interfaces. It supports the CC4 connector.

5.5.3.4 Other Boards

As long as they are needed in this system, the following boards should be configured no matter what networking environment the ZXMVC8900 is applied in.

VPU/EVPU/HDPU: Video Processing Unit, performing the gateway function,

continuous presence back transmission, rate matching and image console function

of H.320 and H.323.

AVO: Video interface adaptor, which provides 10-channel composite video output

and 1-channel video input. Video output can be connected with an external monitor

to monitor the effects of various terminal sites. The video input can be connected to

the VCD player and used for video broadcast for all the conference terminals.

DPU: Data processing unit, which supports the T.120 data conference function for

the ZXMVC8900 and supports the 128-chanel HMLP × 128kbit/s data processing.

Besides the above functional boards and conversion adaptors, the ZXMVC8900 has two other boards placed beyond the above board areas. One is the backplane BACKB located in the middle of the equipment board layer, that is, at the back of the functional



board area and in front of interface adaptation board and conversion board. BACKB implements effective communication between all boards and between boards and MC. The other is the MC Power Control (MCPC) and provides the DC power supply needed for MC. MCPC is a small board installed on the backplane and is located at the nameplate position on the cabinet back.

5.6 System Configuration

The system configuration of the ZXMVC8900 should give full consideration to the communication network used. Different application environments need different board configurations.

5.6.1 Pure H.323 IP System

When NILAN is configured as a network interface in the system, the ZXMVC8900 Intelligent Multimedia Server can control 128 384kbit/s IP terminals. The single-frame board configuration of a pure IP system is shown in Table 3.

Table 3 Single-frame Board Configuration of Pure IP System

Slot ID

Front Functional Board Area

Back Interface Adaptation Area

Back Conversion Board Area

0 Void Void Void

1 MPU CC A2LAN

2 APUMIX Void Void

3 APU Void Void

4 APU Void Void

5 APU Void Void

6 Void Void Void

7 Void Void Void

8 Void Void Void

9 NILAN Void A2LAN

10 NILAN Void A2LAN

11 NILAN Void A2LAN

12 NILAN Void A2LAN

13 NILAN Void A2LAN

14 NILAN Void A2LAN

15 NILAN Void A2LAN

16 NILAN Void A2LAN

Note:

MPU can be configured at Slot 0, and backplane CC and A2LAN corresponding to 011000 are configured as Slot 1. When MPU is at Slot 0, it corresponds to the upper network port of A2LAN. When MPU is at Slot 1, it corresponds to the lower network port



of A2LAN. Or 2 MPUs are configured respectively at Slots 0 and 1. In this case, the MPUs at slot 0 and slot 1 correspond respectively to the upper and lower network interfaces of the A2LAN (The rest may be deduced by analogy and no more description is necessary here).For the 020600 backplane, when 2 MPUs are configured respectively at Slots 0 and 1, 2 A2LANs should be inserted at Slots 0 and 1, which are connected with lower network ports.

After NILANs have been inserted, A2LAN should be installed in the same slot in the conversion board area on the chassis back.

When the system is configured with ENIL as a network interface, the ZXMVC8900 Intelligent Multimedia Server can control 512 2Mbit/s IP terminals. The single-frame board configuration of a pure IP system is shown in Table 4:


Slot ID




0 Void Void Void

1 MPU CC A2LAN

2 APUMIX/EAPU Void Void

3 APU/EAPU Void Void

4 APU Void Void

5 APU Void Void

6 Void Void Void

7 Void Void Void

8 Void Void Void

9 ENIL Void A2LAN

10 ENIL Void A2LAN

11 ENIL Void A2LAN

12 ENIL Void A2LAN

13 ENIL Void A2LAN

14 ENIL Void A2LAN

15 Void Void Void

16 Void Void Void

Similarly, A2LAN should be installed in the same slot in the conversion board area on the chassis back after ELANs have been inserted.

5.6.2 Pure H.320 E1 System or Pure Standard-definition System

The ZXMVC8900 Intelligent Multimedia Server can control a maximum of 96 E1 terminals or 24 8M standard-definition terminals. The single-frame board configuration of the pure E1 system or pure standard-definition system is shown in Table 5:



Table 5 Single-frame Board Configuration of Pure E1 or Pure Standard-definition System

Slot ID




0 Void Void Void

1 MPU CC A2LAN


3 APU Void Void

4 APU Void Void

5 Void Void Void

6 BPU (+M8DSP) Void Void



9 Void Void Void

10 Void Void Void

11 N16E1 A16E1 L16E1

12 N16E1 A16E1 L16E1

13 N16E1 A16E1 L16E1

14 N16E1 A16E1 L16E1

15 N16E1 A16E1 L16E1

16 N16E1 A16E1 L16E1

After N16E1 has been installed, L16E1 should be installed in the same slot in the conversion board area on the chassis back and A16E1 installed in the same slot in the interface adaptation area on the chassis back (The rest may be deduced by analogy and no more description is necessary here).

5.6.3 Pure H.320 ISDN PRI System

The ZXMVC8900 Intelligent Multimedia Server provides a maximum of 120-channel ISDN terminals less than or equal to 512kbit/s. The single-frame board configuration of the pure ISDN PRI system is shown in Table 6:


Slot ID




0 Void Void Void

1 MPU CC A2LAN

2 APUMIX/EPAU Void Void

3 APU Void Void

4 APU Void Void

5 APU Void Void




Slot ID





8 IPU (+M8DSP) Void Void

9 Void Void Void

10 Void Void Void

11 Void Void Void

12 Void Void Void

13 N16E1 A16E1 L16E1

14 Void Void Void

15 N16E1 A16E1 L16E1

16 Void Void Void

5.6.4 H.320 ISDN PRI/E1 Hybrid System

The ZXMVC8900 Intelligent Multimedia Server supports hybrid system configuration of ISDN PRI and E1. The MCU can be configured with 1~6 N16E1s, 1~2 BPUs, 1~4 APUs, 1 MIX (subcard) and 1 set of MPU+CC+A2LAN. According to the distribution of buses at the BPU and IPU set at the higher layer, the number of ISDN PRI ports can be N1 × 8 channels (N1=0~16); and the number of E1 ports can be N2×4 channels (N2=0~16) (however, N1+N2=16).

5.6.5 H.320 and H.323 Hybrid System

the ZXMVC8900 supports hybrid system configuration of H.320 and H.323. The MCU can be configured with 1~6 N16E1s, 1~2 BPUs, 1~4 APUs(EAPU), 1 MIX (subcard), and 1 MPU+CC+A2LAN. According to the distribution of buses at the BPU, NILAN and IPU set at the higher layer, the number of ISDN ports can be N1×8 channels (N1=0~16); the number of E1 ports can be N2×4 channels (N2=0~16); and that of LAN ports can be N3×8 channels (N3=0~16) (however, N1+N2+N3=16).

The typical configuration of the E1/IP hybrid system is shown in Table 7.

Table 7 Typical Configuration of the E1/IP Hybrid System

Slot ID




0 Void Void Void

1 MPU CC A2LAN


3 APU Void Void

4 Void Void Void

5 Void Void Void


7 Void Void Void



Slot ID




8 Void Void Void

9 VPU/EVPU/HDPU AVO Void

10 HPU HPA1 Void

11 Void Void Void

12 NILAN/ENIL Void A2LAN

13 NILAN/ENIL Void A2LAN

14 Void Void Void

15 N16E1 A16E1 L16E1

16 N16E1 A16E1 L16E1

Description: If no standard-definition terminal is accessed, VPU/EVPU/HDPU can implement the gateway function. If a standard-definition gateway is required, HPU must be configured.

5.6.6 T.120 Data Conference

If a T.120 conference held is not a pure software data conference, the board DPU specially for the T.120 conference must be configured. In addition, the T.120MC software must be installed. For the installation and configuration of the T.120MC software, please refer to Section 6.4.

It is recommended that DPU should be installed at any slot between Slot 8 and Slot 16. Upon the installation of the DPU, you have to install A2LAN in the same slot in the conversion board area on the chassis back and adopt the upper network port. For example, to implement T.120 conference in the E1 system, you only have to install one more DPU based on the previous configuration, as shown in Table 9.

Table 8 Configuration Example of T.120 Conference

Slot ID




0 Void Void Void

1 MPU CC A2LAN


3 APU Void Void

4 APU Void Void

5 Void Void Void




9 DPU Void A2LAN

10 Void Void Void



Slot ID




11 N16E1 A16E1 L16E1

12 N16E1 A16E1 L16E1

13 N16E1 A16E1 L16E1

14 N16E1 A16E1 L16E1

15 N16E1 A16E1 L16E1

16 N16E1 A16E1 L16E1

Note:

A2LAN has 2 network ports, of which the DPU board only uses the upper one.



6 Networking and Synchronization

This chapter introduces the networking modes and clock synchronization of the ZXMVC8900.

6.1 Networking Unit

The hierarchy of ZXMS80 (V2.03) is shown in Figure 10. the ZXMVC8900 is the media switching layer unit.

Figure 10 Hierarchy of ZXMS80 (V2.03)

Operation

support layer

Broadband accessnetwork

Broadband backbonenetwork

ADSL

ZXMS80 networkmanagement

ZXMS80 conference scheduling

ZXMS80 authentication &

accounting

ZXMS80 resource

management

ZXMS80 top-level GK

Dy nam iccascade

VDSL ISDNVPN

DDN

ZXMVC2020

ZXMVC4050 Conference room

terminal by othermanufacturers

Desktop term inals

by other

manufacturers

LAN

ZXMVC4

050

ZXMV

C6000

Media switching

lay er

Structure of "Beyond Tim e-Space" multim edia service center

ZXMVC890

0MP

ZXMVC890

0MP

ZXMVC890

0MC

ZXMS80

GK

ZXMVC890

0MP

ZXMVC8900 MP

ZXMVC8900

MC

ZXMS80GK

User accesslay er

Conference room

terminal by other

manufacturers

ZXMS80 (V2.03) is hierarchically clear and is composed of 3 layers: Operation support layer, media switching layer and user access layer. This hierarchical design philosophy isolates operation support from media switching, which contributes to the independent development of the management system and the equipment. In the design of the operation support layer, service management and network management are further isolated and this contributes to the independent development of diversified multimedia services in the service center. For details of ZXMS80 (V2.03), please refer to ZXMS80 (V2.03) Multimedia Service Management System Technical Manual.

H.320 videoconference system is composed of the Intelligent Multimedia Server MCU, conference terminal, transmission path and operation support layer server group.



Compared with an H.320 system, an H.323 videoconference system has one more Gatekeeper (GK) in its networking unit to implement address resolution. If H.320 and H.323 are in hybrid networking, the conference network must be configured with H.320 and H.323 gateways (GWs) to achieve the interworking between the two systems.

6.1.1 Intelligent Multimedia Server

The MCU function of the ZXMVC8900 is implemented by the MC, MPU and other boards. MCU is located at the media switching layer. It is generally set at a network node and used for communication between conferences in different places. The MCU in a numeric field enables the mixing and switching of such digital signals as audio, video, data and signaling, without affecting the quality of audio/video signals at all. It is responsible for voice mixing, video switching and the processing of multipoint communication protocols.

6.1.2 Conference Terminal

A conference terminal is located at the user access layer and usually made up of the video input/output, audio input/output, video coding/decoding, audio coding/decoding and multiplexing/demultiplexing. On one hand, it processes and transmits the video/audio in the local site while on the other hand, it processes and broadcasts the transmitted video/audio information of the remote site.

6.1.3 GK

GateKeeper is located at the media switching layer and is responsible for call control of the H.323 node, for example, address translation and bandwidth management. A GW is optional in an H.323 network, but a GK is indispensable to a network as long as an H.323 node exists.

6.1.4 Operation Support Layer Server Group

The operation support layer follows the latest design of the operation support system and is divided into 3 layers, that is, the presentation layer (Presentation), application logic layer (Business Logic) and data service layer (Data Service).

The presentation layer provides the function of man-machine interface. It is composed of the service management center, customer service center, service handling center, authentication & accounting center and NM center. The service management center is used by the service administrator, the customer service center provides service for common videoconferencing users, the service handling center is used by the shop-assistant, the authentication & accounting center is used by the AAA administrator (AAA--short form of Authentication, Accounting and Authorization) and the NM center is used by the equipment administrator. For the sake of users, the presentation layer of the operation support layer in ZXMS80 (V2.03) is mostly implemented by means of a WEB browser.

The application logic layer is responsible for specific calculations and the selection of a program flow, and is engaged in the design of commercial logics. The application logic layer is composed of the CSS, resource management system, AAA system, and network



management system. The CSS, resource management system and AAA system belong to service management, while the network management system belongs to equipment management. The CSS is responsible for the service flow of video conference service and streaming service, including such functions as the service configuration of videoconferencing users and the service administrator, service control and service statistics. The resource management system calculates, allocates and manages the whole service resource. The AAA system is responsible for user management, authentication, accounting and settlement of users and terminals. The network management system is responsible for the configuration management, fault management, performance management and security management of the equipment (MCU and streaming server).

The data service layer maintains and updates the application program data, and is composed of service databases.

6.2 Networking Application

6.2.1 Networking by Means of an IP Network

The networking diagram by means of an IP network is shown in Figure 11.

Figure 11 Networking by Means of an IP Network

IP router

Server group at the

operation support layer

ZXMVC8900

Gatekeeper

Firewall

TCP/IP

ADSL LAN

FPASS

Firewall

Considering security, we generally include the operation support layer equipment within an LAN protected by means of a firewall.



The media switching layer equipment is generally included in a public network and this facilitates the communication between a terminal and GK or MCU. A TCP/IP path is used to connect GK, MCU and a terminal. The H.323 terminal access mode based on the TCP/IP network may be the ADSL dialup access or LAN access (may be the DHCP dynamic allocation of IP address). Some terminals within an enterprise LAN can be accessed by means of the FPASS proxy server to a public network. The FPASS proxy server may solve the problem of NAT (address mapping) from an LAN to a public network, and enables multiple LAN terminals to share one public network IP address for access. For details of FPASS, please refer to ZXMS80 (V2.03) Multimedia Service Management System FPASS Technical Specificationl.

6.2.2 Networking by means of a Digital Transmission Network

The networking by means of a digital transmission network is shown in Figure 12.

Figure 12 Networking by Means of the E1 Digital Lines (or DDN)

Server group at the operationsupport layer

FirewallIP router ZXMVC8900

E1

Digital

transm ission

network

E1E1

E1

The ZXMVC8900 and E1 terminals can be connected in three modes:

Connected directly via a coaxial cable when the cabling distance between the

terminal and the MCU is less than 300m.

Connected via a digital line transmission network when the cabling distance

between the terminals and the MCU is more than 300m, and there exists an E1

interface between them.

HDSL transmission equipment can be selected for distance extending (Effective

transmission distance: 5km) when the cabling distance between the terminals and

the MCU is more than 300m, but no E1 interface exists between them.

The ZXMVC8900 is connected with the operation support layer equipment via the TCP/IP network. Out of consideration for security, we recommend that the operation support layer equipment should be included within an LAN protected by a firewall.



6.2.3 Networking by Means of an ISND

The networking by means of an ISDN is shown in Figure 13.

Figure 13 Networking Diagram by Means of ISDN

Server group at the operation

support layer

FirewallIP router ZXMVC8900

PRI

ISDN

network

BRIBRI

BRI

The ZXMVC8900 is connected with an ISND via the PRI line of the ISDN. Various ISDN conference terminals (for example, ZXMVC4050) are accessed via a BRI interface to an ISDN, through which these terminals establish a communication link with the ZXMVC8900.


6.2.4 Networking with Standard-definition Terminals

In terms of networking, standard-definition terminals are connected with the ZXMVC8900 in the similar way as E1 terminals are. However, the ZXMVC8900 is connected with standard-definition terminals via multiple E1 lines and the latter always employs multiple E1 interfaces of the ZXMVC8900. The standard-definition terminal rate may be 2M, 4M, 6M or 8M. Then, 1~4 pairs of E1s may be used between the MCU and the standard-definition terminals to achieve high-rate communication between them.

The greatest difference between a common terminal and a standard-definition terminal is that the latter uses MPEG-2 for video coding/decoding. If the standard-definition terminals and common terminals are in the same networking, the system is required to provide a standard-definition GW to achieve the H.261/H.263/H.264 protocol interworking between MPEG-2 and traditional terminals.


The networking with standard-definition terminals by means of an E1 network is shown in Figure 14.



Figure 14 Networking Diagram in Standard-definition System

Firewall IP router

ZXMVC8900

Digital

transmission

network

n×E1

n×E1

n×E1

n×E1

ZXMVC6000 ZXMVC6000ZXMVC6000

6.2.5 Hybrid Networking

The ZXMVC8900 may employ different types of terminals for hybrid networking, in which different terminals are connected with the ZXMVC8900 in the same way as a single network is used.

The standard-definition image GW implements the interworking between different video protocols. On one hand, the MPEG-2 video signals provided by standard-definition terminals are decoded by means of an external MPEG-2 decoder as composite video signals. These signals are then coded into the H.261/H.263/H.264 format by means of the ZXMVC8900 VPU/EVPU/HDPU and sent to common terminals. In this way, the format of the video signals of the standard-definition terminals is converted into that of the common terminals. On the other hand, the H.261/H.263 video code stream of common terminals is decoded by means of VPU/EVPU/HDPU into composite video, which is sent to an external MPEG-2 coder. This coder codes the composite video stream into the MPEG-2 video format, which is then sent to a standard-definition terminal. In this way, the format of the video signals of the common terminals is converted into that of the standard-definition terminals.

A common image gateway and multirate continuous presence may be implemented by employing the VPU/EVPU/HDPU of the ZXMVC8900 for format conversion.

6.3 Clock and Synchronization

A videoconference system clock is of vital importance in system running. If the clock is unstable, system out-of-syn. May occur, which may make the whole system unable to work normally.



6.3.1 Clock Selection

the ZXMVC8900 provides 3 clock selections: BITS clock, LINE clock and internal clock.

BITS clock: That is, telecom network clock.

LINE clock: Extracts clock from a specified line.

Internal clock: Namely, free-run clock mode, generated by the crystal oscillator on

the CC board.

6.3.2 Synchronization Mode

Corresponding to the above clock selections, the following 4 synchronization modes are provided in the ZXMVC8900:

BITS clock synchronization mode: The system synchronizes with the BITS clock. If

the BITS clock is lost, the system will automatically return to the free-run clock

mode.

LINE clock synchronization mode: The system synchronizes with the LINE clock. If

the LINE clock is lost, the system will automatically return to the free-run clock

mode.

LINE clock and free-run synchronization mode: The system first synchronizes in the

LINE clock mode. If the LINE clock is lost, the system will automatically return to the

free-run clock mode.

Free-run clock synchronization mode: The system synchronizes with the internal

clock provided by the ZXMVC8900.

6.3.3 Principles of Clock Synchronization

the ZXMVC8900 is the conference network core and all terminals are synchronized to its MCU.

Different networking environments requires that the system should be in different synchronization modes:

In a pure IP network, the free-run clock mode is generally selected.

In a pure E1 network, any synchronization mode can be selected.

In a pure ISDN, the system is in the BITS clock synchronization mode, with the

clock reference point in the PSTN.

In a standard-definition system, the LINE clock mode or free-run clock mode can be

selected.



In an E1/ISDN hybrid network, the system is in the BITS clock synchronization

mode, with the clock reference point in the PSTN.

In H.320 and H.323 hybrid networking, any synchronization mode can be selected.

6.3.4 Clock Setting

The clock of the ZXMVC8900 is set in the network management system of ZXMS80 (V2.03). When the network management system performs the hardware configurations for the MCU, it must set the system clock based on actual networking conditions.



7 Technical Specification

7.1 Technical Procedures

ZXMVC8900 complies with the following technical procedures for videoconferences:

H.320: Framework recommendations for the video conference and videotelephone

system.

H.323: Multimedia communications systems based on packet switching.

H.221: Frame structure for 64~1,920 kbit/s channels in audiovisual telecom

services.

T.120: Data protocols for multimedia conferences.

H.224: A realtime control protocol for simplex applications of LSD/HSD/MLP

channels by employing the H.221 protocol.

H.245: Control protocol for multimedia communication.

H.242: Protocol for establishing communication system between audiovisual

terminals using digital channels less than 2Mbit/s (actually, an end-to-end

communication protocol).

H.243: Procedures for establishing communication between three or more

audiovisual terminals using the channels greater than 1,920 kbit/s (actually the

communication protocol between multiple terminals and MCU).

H.230: Frame synchronization control & indication signals for audiovisual systems

C&I (Frame synchronization control & indication signals for audiovisual systems

C&D).

H.225.0: Call signaling protocols and media data stream packet protocols in

multimedia communication systems based on packet switching.

H.261: Video coding/decoding for audiovisual services at p×64kbit/s.

H.263: Video coding/decoding for low-rate communication.

T.123: Network-specific protocol stacks for multimedia conferences.

G.711: Pulse Code Modulation (PCM) of voice frequencies (audio coding/decoding

protocol).



G.722: 7 kHz audio Adaptive Differential Pulse Code Modulation (ADPCM) within 64

kbit/s (video coding/decoding protocol).

G.723.1: Dual-rate speech coder for multimedia communication transmission at 5.3

kbit/s and 6.3 kbit/s (audio coding/decoding protocol).

G.728: Coding of speech at 16 kbit/s using Low-Delay Code Excited Linear

Prediction (LD-CELP) (audio coding/decoding protocol).

Q.922: Data link layer specifications for ISDN frame mode bearer services.

G.703: Network digital interface for Pulse Code Modulation (PCM) communication

system engineering).

IEEE802.3U: 10/100BASE-T Ethernet interface standard.

7.2 Major Technical Indexes

The major technical indexes of ZXMVC8900 are as follows:

SUPPORTED STANDARDS

Standard: ITU-T H.323、H.320；IETF SIP

Video: ITU-T H.261、H.263、H.263+、H.263++、H.264、ISO/IEC MPEG-2、MPEG-4

Audio: ITU-T G.711、G.722、G.728、AAC-LC/LD、 ZTE-BA、 ISO/IEC 13818-3

Other: ITU-T H.221、H.225、H.231、H.235、H.241、H.242、H.243、H.245、H.281、

H.283、H.460、T.120、T.140

SYSTEM CAPACITY

IP：256×2Mbps

E1：96×2Mbps

ISDN：120×512Kbps

AUDIO PROCESS

Supporting 256 full mix, and VAD

SUPPORTED TERMINAL COMMUNICATION RATE

IP：64Kbps～8Mbps

E1：64Kbps～8Mbps

ISDN：64Kbps～512Kbps



CONFERENCE CONTROL

Chairman control, voice active control,

Director control

Supporting WEB interface remote control

REMOTE CONTROL

Supporting remote control of terminal camera in H.320 and H.323 systems

CASCADE FUNCTION

Supporting E1, IP cascades

Supporting multi-group cross MCU cascade conference

Supporting 3-level conference cascade supporting 2-level data conference cascade

SUPER NETWORK ADAPTABILITY

Patented techniques PacketShaping, SuperLock and FastLock enhancing network adaptability, reducing unstable line quality interference of IP, ISDN and dedicated networking on conferences, supporting IP QoS setting

CALL MODE

Calling in/Calling out

CONFERENCE ORGANIZATION MODE

Booking a conference in schedule or having a meeting immediately

MULTI-PICTURE DISPLAY

Supporting 30 image analog output (for TV wall)

Supporting 16 Continuous Presence(CP), multiple display modes

RATE MATCH

Supporting 5 different rate matches

NETWORK INTERFACES

FE（10M/100M）、E1/T1（1~4E1 binding）

CERTIFICATE

CE, 3C

MAINTENANCE MANAGEMENT

Supporting remote NM, remote update and maintenance



POWER

AC:

100 VAC ~ 120 VAC, 60 Hz, 10 A or

200 VAC ~ 240 VAC, 50 Hz, 5 A

600 Watts Max.

DC：

667W Max

-38V ～-72V, 18A Max

PHYSICAL PARAMETER

577 mm × 487 mm × 375 mm (H × W × D)

Able to put in 19’ standard cabinets

Weight: 40 kg Max.

WORKING ENVIRONMENT

Temperature: -10 ºC ~ +50ºC

Relative humidity: 5% ~ 95%

Atmospheric pressure: 70 kPa ~ 106 kPa

ELECTROMAGNETIC COMPATIBILITY

IEC55022 and IEC55024

GROUNDING

The case connecting to protective grounding, its grounding resistance less than 1 ohm



8 Abbreviations

Table 9 Abbreviations

Abbreviations Full Name (English)

A2LAN Adaptors of LAN

ADPCM Adaptive Differential Pulse Code Modulation

APU Audio Processing unit

BACKB Backplane

BPU B-channel Processing unit

BTV Business TV

CC Clock Card

CIF Common inter frame

CSCW Computer Support Cooperative Work

C&I Control & Indicate

DDN Digital Data Network

DPU Data Processing unit

EAPU Enhance Audio Processing unit

ENIL Enhance Network Interface of LAN

EVPU Enhance Video Processing unit

GK Gate keeper

GW Gateway

HMLP High-speed Multiple Link Protocol

HPA1 Standard-definition Process Adapter

HPU Standard-definition Processing unit

HMU Standard-definition Monitor Unit

HSD High Speed Data

ISDN Integrated Services Digital Network

ISO International standard organize

IEC International electricity commission

ITU International Telecommunications Union

I/O Input/Output

IP Internet protocol

IPU ISDN Processing unit

L16E1 Link-display of 16 E1s

LAN Local Area Network

LD-CELP Low Delay Code Excite Linear Prediction

LSD Low Speed Data



Abbreviations Full Name (English)

MC Multi controller

MCPC MC Power Control

MCU Multipoint Control Unit

MIX Mixing Processing unit

MLP Multiple Link Protocol

MPU Main Processing unit

NILAN Network Interface of LAN

PCI Program controlled interruption

PCM Pulse Code Modulation

QCIF Quarter common inter frame

Qos Quality of service

SDH Synchronous Digital Hierarchy

UPS Uninterruptible Power Supply

VPU Video Processing unit

ZXMVC Zhongxing Multi Video Conference

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