Nec MCU 5000 MCU 5000A - Equipment Manual

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NECA 340-414-000

ISSUE 2

DOI-E09003

STOCK # 0293922

MCU 5000A MULTIPOINT

CONTROL UNIT

EQUIPMENT MANUAL

SEPTEMBER, 1998

NEC America, Inc.

LIABILITY DISCLAIMER

NEC America, Inc. reserves the right to change the specifications, functions, or features, at any time, without notice.

NEC America, Inc. has prepared this document for use by its employees and customers. The information contained herein is the property of NEC America, Inc. and shall not be reproduced without prior written approval from NEC America, Inc.

NEC America, Inc.

Printed in USA

MCU 5000A Multipoint Control Unit Manual Contents

Manual Contents

NECA 340-414-100 General Description

Contains physical description, features, equipment, applications, equipment description, and customer information.

NECA 340-414-210 Installation

Describes shelf installation, unit installation, external cabling connections, equipment power-up, and initial settings. Also provides information on switch/ strap setting with LED functions.

NECA 340-414-220 System Parameters

Contain system parameters and parameter setting procedures.

NEAC 340-414-300 Console Operation

Describes the con trol commands f or the eq uipme nt usi ng ext ern al co nsole such as personal computer.

NECA 340-414-500 Maintenance

Contains troubleshooting, unit replacement, and preventive/corrective maintenance procedures.

NECA 340-414-100 Revision 2.0

Manual Contents MCU 5000A Multipoint Control Unit

This page is for your notes.

NECA 340-414-100 Revision 2.0

NECA 340-414-100

ISSUE 2

DOI-E09003

PART OF STOCK # 0293922

MCU 5000A MULTIPOINT

CONTROL UNIT

GENERAL DESCRIPTION MANUAL

SEPTEMBER, 1 998

NEC America, Inc.

LIABILITY DISCLAIMER

NEC America, Inc. reserves the right to change the specifications, functions, or features, at any time, without notice.

NEC America, Inc. has pr ep ared thi s doc um ent for u se by i ts employees and custom ers. The information conta ined herein is the property of NEC America, Inc. and shall not be reproduced without prior written approval from NEC America, Inc.

NEC America, Inc.

Printed in USA

MCU 5000A Multipoint Control Unit Table of Contents

1: GENERAL.................................................. ................................. .............................. 1

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

2: SYSTEM CONFIGURATION .................................................................................... 3

Basic Configuration.......................................................................................................... 3

Option............................................................................................................................... 3

Line Growth.............................................................................................................................. 3

Simultaneously Connecting Teleconference............................................................................ 3

Connecting Cable................................................................................................................ ..... 4

Accessories.................. ...... ....... ...... ....... ...... ....................................... ...... ....... ...... ....... . ..... ..... 4

3: SYSTEM FEATURES ............................................................................................... 5

Basic Connection................. ........................ .............................................. ...................... 5

Usable Teleconference Terminal ..................................................................................... 5

Start-up of Equipment ...................................................................................................... 6

Start-up .................................................................................................................................... 6

System Parameter Setting . ....... ...................................... ....... ...... ....... ...... ....... ...... ....... ...... ..... 6

Teleconference Type ....................................................................................................... 6

Point-to-Point Teleconferen ce............................. ...... ...... ....... ....................................... ...... ..... 6

Broadcast Teleconference ....................................................................................................... 6

Multipoint Teleconference (RCON)........................... ...... ....................................... ....... ...... ..... 7

Multipoint Teleconference (MCON)........................................................... ....... ...... ....... ...... ..... 8

Multipoint Lecture Connection.................................................................................................. 9

Teleconference Start and Completion........ .............................................. ...................... 11

Line and Teleconference Terminal Number.................................................. .. .. .. .. .. ....... 12

Physical Line Number ............................................................................................................ 12

Logical Line Number .............................................................................................................. 12

Logical Line Number Assignment on ISDN Interface Unit Installation........................... 14

Teleconference Port Number................................................................................................. 17

Teleconference Terminal Number.......................................................................................... 17

Line Interface ................................................................................................................. 18

1.5M LIF Unit.......................................................................................................................... 18

RS-422/HSD IF Unit............................................................................................................... 19

H0-INF Unit............................................................................................................................ 19

Common Item for Each LIF Unit............................................................................................. 20

Cascade-Connection.................................... ........................ .......................................... 20

Console Through-Pass .................................................... .. .. .. .. ................................ .. .. .. 21

Supplementary Functions........................................................ ..................... ................. 22

Automatic Start Setting Function............................................................................................ 22

Memory Card Copy Function ................................................................................................. 22

Loopback Function................................................................................................................. 22

4: HARDWARE CONFIGURATION............................................................................ 23

1.5M LIF Unit................................................................................................................. 24

Genera................................................................................................................................... 24

Functions................................................................................................................................ 24

Functional Block Diagram ...................................................................................................... 25

1.5M LIF Unit Interface........................................................................................................... 25

Line Management .................................................................................................................. 27

RS-422 LIF Unit ........................... ................................................................... .. .. .. .. ....... 28

General .................................................................................................................................. 28

Functions................................................................................................................................ 28

NECA 340-414-100 Revision 2.0 Page i

Table of Contents MCU 5000A Multipoint Control Unit

Interface Specification ........................................................................................................... 28

H0-INF Unit.................................................................................................................... 31

General.................................................................................................................................. 31

Functions............................................................................................................................... 31

EC H211 MUX Unit........................................................................................................ 34

General.................................................................................................................................. 34

Functions............................................................................................................................... 34

V SW/LSD IF Unit .......................................................................................................... 36

General ....................... .................................................... .................................................... ... 36

Functions............................................... .................................................... ............................ 36

A CODEC Unit ................................................. .. .. .. .. ................................ .. .. .. .. .. ............ 39

Functions............................................................................................................................... 39

A SUM Unit .................................................................................................................... 42

General.................................................................................................................................. 42

Function................................................................................................................................. 42

PG/SIO Unit ....... .............. .. .. ............. ... .. ............. .. .. .............. .. .. ............. ... .. ............. .. .. .. 45

Genera...... ...... ....... ...... ....................................... ....... ...... ...... ....... .........................................l 45

Functions............................................................................................................................... 45

M CONT Unit ................................................................................................................. 47

General.................................................................................................................................. 47

Functions............................................................................................................................... 47

VDSW Unit..................................................................................................................... 49

General........... ....................................... ....................................... ......................................... 49

Functions............................................................................................................................... 49

5: SOFTWARE ............................................................................................................ 51

Task Description ............................................................................................................ 51

Loader (LO) ........................................................................................................................... 51

Timer (TM)............................................................................................................................. 51

Memory Card Driver (MD) ..................................................................................................... 51

Conference Management (CM)............................................................................................. 51

Console Control (CC) ............................................................................................................ 52

Console Driver (CD1 to CD3) ................................................................................................ 52

Command Generator............................................................................................................. 52

Real-Time Clock Management (RM)..................................................................................... 52

Line Management (LM) ......................................................................................................... 52

AMI Line Control (LCA) ......................................................................................................... 52

RS-422 Line Control (LCR) ................................................................................................... 52

ISDN Line Control (LCI)......................................................................................................... 52

FIFO Driver (FH).................................................................................................................... 52

Line Exchange (LX)............................................................................................................... 52

Picture Switching (PS)........................................................................................................... 53

Voice Input/Output Control (VC)............................................................................................ 53

Multipoint Control (TCA, TCB)............................................................................................... 53

Electrical Whiteboard Control for MCU.................................................................................. 53

LAP-B Drive (LD1 to LD8) ..................................................................................................... 53

BAS Driver (BD1 to BD8) ...................................................................................................... 53

6: SPECIFICATIONS................................................................................................... 57

Physical Specification .................................................................................................... 57

Electrical Specification................................................................................................... 57

Page ii NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit Table of Contents

7: SYSTEM CONTROL AND VARIOUS APPLICATIONS......................................... 61

Line Switching Control ................................................................................................... 61

Data Highway......................................................................................................................... 61

Multipoint Connection............................................................................................................. 62

Voice Signal ........................................................................................................................... 62

Picture Signal......................................................................................................................... 63

Low-speed Data..................................................................................................................... 64

Point-to-Point Connection .. ....... ...... ....... ...... ....... ...................................... ....... ...... ....... ...... ... 65

Broadcast Connection............................................................................................................ 66

Picture Switching Control............................................................................................... 67

Automatic Switching Mode.................................................................................................... 67

Manual Switching Mode......................................................................................................... 67

Voice Detection Control ................................................................................................. 68

Teleconference Terminal Interface ................................................................................ 69

Command Details................................................................................................................... 70

Interface Format..................................................................................................................... 73

Sequence Example................................................................................................................ 74

Loopback Test............................................ ........................ ............................................ 77

MCU 5000A Loopback................................................................................................... 78

Self Diagnostic Function ...................................................... .. .. ................................ .. .. .. 80

8: MCU CONSOLE...................................................................................................... 81

Console.......................................................................................................................... 81

Console Command ........................................................................................................ 81

9: SYSTEM PARAMETER.......................................................................................... 85

Application...................................................................................................................... 85

System Parameter ......................................................................................................... 85

NECA 340-414-100 Revision 2.0 Page iii

MCU 5000A Multipoint Control Unit List of Figures

List of Figures

Figure 3-1: Typical Connecting Diagram....................................................... 5

Figure 3-2: Logical Line Number Assignment ............................................ 13

Figure 3-3: Logical Line Number Assignment (line Rate 64 kbps)............ 14

Figure 3-4: Logical Line Number Assignment (Line Rate 2×64 kbps)...... 15

Figure 3-5: Logical Line Number Assignment (Line Rate 384 kbps) ........ 16

Figure 3-6: Casade-Connection of Two MCU 5000A .................................. 21

Figure 3-7: Two Groups Casade-Connection.............................................. 21

Figure 3-8: Example of Console Through-Pass Connection..................... 22

Figure 4-1: Block Diagram of MCU 5000A................................................... 23

Figure 4-2: Block Diagram of 1.5M LIF Unit................................................. 25

Figure 4-3: 1.5M LIF (CH1 to CH16) Connector Pin Assignment............... 26

Figure 4-4: RS-422 LIF (CH1 to CH16) Connector Pin Assignment........... 29

Figure 4-5: Block Diagram of RS-422 LIF Unit............................................ 30

Figure 4-6: Block Diagram of H0-INF Unit ................................................... 32

Figure 4-7: H0-INF (CH1 to CH16) Connector Pin Assignment.................. 33

Figure 4-8: Block Diagram of EC H221 MUX Unit....................................... 35

Figure 4-9: Block Diagram of V SW/LSD IF Unit (1of 2).............................. 37

Figure 4-9: Block Diagram of V SW/LSD IF Unit (2 of 2)............................. 38

Figure 4-10: Block Diagram of A CODEC Unit .............................................. 41

Figure 4-11: Block Diagram of Voice Signal Process 1................................ 43

Figure 4-12: Block Diagram of Voice Signal Process 2................................ 44

Figure 4-13: Block Diagram of PG/SIO Unit................................................... 46

Figure 4-14: Block Diagram of M CONT Unit................................................. 48

Figure 4-15: Block Diagram of VDSW Unit.................................................... 50

Figure 5-1: MCU 5000A Task Diagram......................................................... 54

Figure 5-2: MCU 5000A Memory Mapping................................................... 55

Figure 6-1: MCU 5000A Outline.................................................................... 57

Figure 6-2: Detailed Rear View of MCU 5000A............................................ 58

Figure 6-3: MCU 5000A Unit Installation Layout......................................... 59

Figure 7-1: Block Diagram of Basic Signal Flow........................................ 61

Figure 7-2: Signal Flow of Voice Signals..................................................... 63

Figure 7-3: Signal Flow of Picture Signals.................................................. 63

Figure 7-4: Low-speed Data Flow................................................................. 64

Figure 7-5: Data Flow on Point-to-Point Connection.................................. 65

Figure 7-6: Data Flow on Broadcast Connection........................................ 66

Figure 7-7: Command/Response Format..................................................... 73

Figure 7-8: Sequence Example (1 of 4)........................................................ 74

Figure 7-8: Sequence Example (2 of 4)........................................................ 75

Figure 7-8: Sequence Example (3 of 4)........................................................ 76

Figure 7-8: Sequence Example (4 of 4)........................................................ 77

Figure 7-9: Loopback Points......................................................................... 79

NECA 340-414-100 Revision 2.0 Page v

MCU 5000A Multipoint Control Unit List of Tables

List of Tables

Table 2-1: MCU 5000A Unit Component............................... ................................... 3

Table 2-2: MCU 5000A Cable Component............................................................... 4

Table 3-1: Line Rate................................................................................................ 12

Table 3-2: Number of Logical Lines...................................................................... 12

Table 4-1: Electrical Specification......................................................................... 25

Table 4-2: 1.5M LIF (CH1 to CH16) Signal Assignment....................................... 26

Table 4-3: User Side Primary Tributary Rate Layer 1 Status Transition............ 27

Table 4-4: Electrical Specification......................................................................... 28

Table 4-5: RS-422 LIF (CH1 to CH16) Signal Assignment................................... 29

Table 4-6: Electrical Specification......................................................................... 33

Table 4-7: H0-INF (CH1 to CH6) Signal Assignment............................................ 33

Table 4-8: Voice Signal Level Setting Value......................................................... 40

Table 4-9: RS-232C Parameter............................................................................... 45

Table 6-1: MCU 5000A Electrical Specification.................................................... 60

Table 7-1: Detail Command/Response (1 of 3)..................................................... 70

Table 7-1: Detail Command/Response (2 of 3)..................................................... 71

Table 7-1: Detail Command/Response (3 of 3...................................................... 72

Table 8-1: Console Command List........................................................................ 81

Table 9-1: System Parameter Setting.................................................................... 85

NECA 340-414-100 Revision 2.0 Page v

List of Tables MCU 5000A Multipoint Control Unit

This page is for your notes.

Page vi NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

1: GENERAL

A: Overview 1.01

plural remote teleconference terminals i n mul ti m edi a conf er enc e s yst em. The MCU 5000A transmits audio, motion/still picture image, etc. via transmission line. The MCU 5000A located at the center in the ne twork as the radic al topology, performs the line connection, video signal switching, and audio sum process.

1.02

lines in 16 lines are available to the multipoint teleconference, and the rest lines are avail abl e to poi nt- to -po int or b roa dca st ing te leconference. When two MCU 5000As are connecting by cascade-connection, maximum 14 lines are available to the multipoint teleconference. The number of point-to-point or broadcasting connecting terminals is flexible according to the transmission rate. In the H.243 mode, the maximum is 20 sites, with 3 cascaded MCUs.

1.03

automatica lly switched current talke r according to the talker vo ice detection or level decision. The MCU 5000A mixes audio signals whenever it receives then from all term inals and retu rns the mixed signals back to all terminal. Each terminal receiv es the au dio si gnals of al l other termi nals c ons tantl y exce pt its o wn signal.

1.04

provides the following features.

The MCU 5000A is a network control equipment which intercon nects the

The MCU 5000A is able to control maximum 16 lines. Maximum eight

During multipoint teleconference performance, received picture image is

The MCU 5000A with the teleconference terminal (Vis uaLink AD series)

• Broadcasting: To broadcast the picture image of any teleconference terminal to a ll the other participating teleconference terminals.

• Selective rece iving: To select recei ving p ictur e imag e o f any ter minal out of those of all t he participa ting telec onference te rminal. Does not apply to cascaded terminals.

• Operator switching: To control the switching of the broadcasting picture image collectively.

• Still picture signal transmitting: To transmit still picture image to all the other participating teleconference terminal.

• Camera remote control: T o con trol the came ra of the termin al from which signal is received. In proprietary mode.

1.05

software. The terminals are divided to one instructor site and plural classroom in this connection state. The instructor site broadcasts own video and voice data to classroom, and control the system. All cameras are controlled instructor site. The instructor and privilege listener are able to send their data (video, voice, and electrical whiteboard) to other terminals.

The tele-education connection can be performed using the optional

NECA 340-414-100 Revision 2.0 Page 1

General Description Manual MCU 5000A Multipoint Control Unit

This page is for your notes.

Page 2 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

2: SYSTEM CONFIGURATION

A: Basic

Configuration

2.01

The combination of units as shown in th e Table 2-1 is required depending

on the line type or number of lines.

B: Option Line Growth

2.02

To expand any teleconference terminal into MCU system, the line

interface incre asi ng i s required only. In conformity with the line interf ac e, one of the following units is added in the MCU 5000A.

• 1.5M LIF unit: 4 lines per unit

• RS-422 LIF unit: 4 or 2 lines per unit (In case of 2×B, 2 lines per unit)

• H0-INF unit: 2 lines per unit

Simultaneously Connecting Teleconference

2.03

To expand the teleconference terminals due to the multipoint connection,

the following 2 units must be added in the MCU 5000A with line expanding action in paragraph 2.02.

• EC H221 MUX Unit:1 terminal per unit (Maximum 8 units per subrack)

• A CODEC unit: 4 terminals per unit (Maxi mum 2 units per s ubrack)

Table 2-1: MCU 5000A Unit Component

UNIT ITEM DESCRIPTION CODE

MCU 5000A SUBRACK (F1341G) 1 pc V53 M CONT (Y2573A) 1 pc

Common

PWR (1 unit per subrack)

A CODEC (Maximum 2 units per subrack)

EC H221 MUX (Maximum 8 units per subrack)

LIF UNIT (Maximum 4 units per subrack)

Data Switch (for Data Distribute)

PG SIO (Y1441A) 1 pc A SUM (Y1439A) 1 pc V SW/LSD IF (Y1440A) 1 pc MEMORY CARD (Y32-MC0003-07+F1341-0606) 1 pc

A AC117V POWER E32-014-Y1573-0B00 B DC -48V (UL) POW ER E32-014-Y3757-0A00 A CODEC

(4CH/UNIT) E32-441-Y1438-0A00

EC H221 MUX

(1CH/UNIT) E32-482-Y3118-0B00 A 1.5M LIF (4CH/UNIT) E32-484-Y1442-0A00 B RS-422/HSD IF (4CH/UNIT) E32-484-Y1443-0A00 C H0-INF (2CH/UNIT) E32-484-Y2761-0A00

VDSW E32-465-Y4775-0A00

NECA 340-414-100 Revision 2.0 Page 3

General Description Manual MCU 5000A Multipoint Control Unit

Connecting Cable

2.04

The connection between MCU 5000A and teleconference terminals is performed by the connecting cable required for user specification. Table 2-2 shows the cable components of MCU 5000A.

Accessories

2.05

The accessories for MCU 5000A are as follows.

• Mounting Screws on subrack (Special screw): 8 pcs.

• Connector for LIF interface (D-sub 15-pin) : 16 pcs.

• Power connection cable : 1 pc.

• Memory Card : 1 pc.

• User’s Manual : 1 copy

Table 2-2: MCU 5000A CABLE COMPONENT

UNIT ITEM DESCRIPTION

A 15Pin-15Pin Conversion (Straight)10 meter

T1 Cable

Conversion Cable for RS-422/HSD IF Unit (When a given cable (1 meter) is shortage.)

RS-449 Cable 37Pin-37Pin Conversion (Str aight)10 meter

Conversion Cable for H0 INTF Unit

X21 Connection Cable

RS-232C Cable

(for T1 DCE Interface Device Connection)

B 15Pin-15Pin Conversion (Cross)10 meter

(for T1 DTE Interface Device Connection)

A 15Pin-37Pin Conversion (Straight)10 meter

(for RS-449 DCE Interface Device Connection)

B 15Pin-37Pin Conversion (Cross)10 meter

(for RS-449 DTE Interface Device Connection)

A 15 Pin Modular jack Conversion Cable 3 meter

(for ISDN Connection)

B 15 Pin Modular jack Conversion Cable 5 meter

(for ISDN Connection)

C 15 Pin Modular jack Conversion Cable 10 meter

(for ISDN Connection) A 15Pin-15Pin Conversion (Str aight) 2 meter B 15Pin-15Pin Conversion (Cross) 2 meter A 25Pin-25Pin Conversion (Str aight) 2 meter B1 25Pin-25Pin Conversion (Cross) 2 meter B2 25Pin-25Pin Conversion (Cross) 5 meter B3 25Pin-25Pin Conversion (Cross) 10 meter

Page 4 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

3: SYSTEM FEATURES

A: Basic Connection 3.01

HSD data ports, and four RS-232C in terface ports. These ports are located on as shown in Fig. 3-1. Refer to the

3.02

teleconference ter minal. connect between two MCU 5000A line connectors using the suitable cable (reverse) as LIF unit.

3.03

the MCU 5000A Control Console or pl ural MCU 5000A Control Con sole with the through-pass cable* (CH 2 or CH 3 only). The RS-232C CH4 port is used to connect debug station, therefore CH4 can not be used for normal operation.

This cable is used for connecting between plural MCU 5000As (Maximum eight). Refer to Sectio n K in this manual.

B: Usable

Teleconference Terminal

3.04

ITU-TS Recommendation H.221/H.242. The remote control function can be performed to operate from NEC’s CODEC or terminal only. NEC does not guarantee for connecting to the CODEC or terminal which is provided by other manufacture.

The MCU 5000A rearplate contains sixteen line connection ports, eight

NECA 340-414-210

The line con nection ports (LIF: CH 1 to CH 16) access to the line of the

The MCU 5000A cascade-connection is required to

The console connection connectors (RS-232C: CH 1 to CH 4) access to

* Through-pass Cable for serial connection

The MCU 5000A can be connected to the CODEC which conforms with

RS-232C HSD

CONSOLE

FOR DEBUG

Figure 3-1: Typical Connecting Diagram

NECA 340-414-100 Revision 2.0 Page 5

CH1

CH2

CH3

CH4

LIF

LINE

General Description Manual MCU 5000A Multipoint Control Unit

C: Start-up of

Equipment

Start-up

3.05

Turn ON the power switch inside of the MCU 5000A front cover after confirm the memory card is installed. The memory card is of SRAM or ROM type and backed up by a lithium battery. The operation program for the MCU 5000A is registered in the memory card and downloaded at system starting. The system start-up has completed normally following message is displayed in MCU console.

**** Multipoint Teleconference control unit MCU 5000A Ver XX.XX ****

**** Copyright (C) NEC Corporation 1990, 1993 ****

Note:

XX.XX indicates the version number of the memory card in the MCU

5000A

System Parameter Setting

3.06

On installation, line rate and interface parameters setting are required according to the user installation environmental and performing condition. System parameters are stored in the backup inside memory (backup by lithium battery). When system parameters is set once, parameter setting is not required since then . Refer to the

NECA 340-414-220

D: Teleconference

Type

3.07

The MCU 5000A provides the following type of teleconference. These plural teleconferences can be performed simultaneously.

Point-to-Point Teleconference

3.08

The line is connected with point-to-point regarding the video and audio without MCU 5000A. Possible connecting number of lines is flexible for line rate that line capacity of point-to-point (Line rate×2×number of point-to-point) and line capacity of broadcasting connection are added. It is possible to lineconnect up to total 16 Mb/s (2 Mb/s×8).

Broadcast Teleconference

3.09

This type broadcasts the video and audio signal of one originating source to the plural points. For the video and audio signal, the MCU 5000A does not control as same as Point- to-Point teleconf erence. This co nnecting c ondition i s the unidirection (one way). The teleconf erence ter minal oper ation is requir ed without H.242 capacity conversion mode. Local loopback connection is also available. The possible connecting number is the same to point-to-point teleconference.

Page 6 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

Multipoint Teleconference (RCON)

3.10

Multipoint telec onfer ence i s t he tel econfe rence sys tem as t he termin als of more than three points with the console or wireless remote controller of terminal is connected.

3.11

The video, audio, and cont rol dat a are ex tract ed from H.221 fr ame signa l, and MCU 5000A processes and controls such as video switching and audio sum with their data. Their data is multiplexed again, then transmit to the teleconference terminals. The following features are provided in multipoint teleconference.

• One MCU 5000A has the ability to connect eight (8) terminals, and three (3) MCU 5000As cascade-connection can be connected to maximum twenty (20) terminals in one multipoint teleconference simultaneously.

• One MCU 5000A has the ability to perform two (2) multipoint teleconference gro ups with in maximu m eight (8) termi nal s per one group (enable different line rate). Two MCU 5000As cascade-connection can provide the maximum three (3)groups.

• The video signal of terminal joined at first is broadcasted.

• Through the broadcasting source is switched to the originating image automatically by t he talker detecting f unction, that switchin g operation can be changed forcibly with the [LOCAL SEND] key on remote controller.

• One of the teleconference terminals can be specified as chairman. The terminal as c hairman forcib ly operates to switch the v ideo image ([OPR] key on remote controller) . In this case, talker detecti on doe s not func tion spontaneously.

• The specific receiving video signal can be selected by the [SLCT RCV] key on remote controller prior to the video signal switching function.

• The incoming audio signals from all the terminal are mixed, and then distributed to all of the terminals. The mixed audio signal sent to each terminal is cut the audio signal of its own terminal off.

• The teleconference terminal name can be indicated on the screen of terminal wit h the superimp ose using by [SITE LIST] key on remote controller.

• The teleconference terminal is identified by beginning “1” number (teleconference number) assigned by MCU 5000A.

• H.242 capacity conversion function can adjust the line rate between the different line rate terminals on the MCU 5000A side.

• Any still picture signal can be sent to all of the terminals. ([STILL SEND] key on remote controller)

• Message tone can be sent to all of the terminals.

• H.243 Data Distribution function is available. (Needs VDSW unit)

NECA 340-414-100 Revision 2.0 Page 7

General Description Manual MCU 5000A Multipoint Control Unit

Multipoint Teleconference (MCON)

3.12

Multipoint telec onfer ence i s t he tel econfe rence sys tem as t he te rmin als of more than three points with the console or wireless remote controller of terminal is connected.

3.13

• One MCU 5000A has the abili ty to connect eight ( 8) terminals, and two (2) MCU 5000As cascade-connect ion can be con nected to maximum fourteen (14) terminals in one multipoint teleconference simultaneously.

• One MCU 5000A has the ability to perform two (2) multipoint teleconference gro ups within ma ximu m eight (8) termi nal s per one group (enable diffe rent line rate). T wo (2) MCU 5000As casc ade-connection ca n provide the maximum three (3)groups.

• The video signal of terminal joined at last is broadcasted (last terminal indicates the video image of the prior terminal).

• The specific receiving video signal can be selected by the [SLCT RCV] key on remote contr oller p rior to the vi deo signa l switchi ng fun ction. The console command, switching the current video image to the specific terminal image, is provided wit hout use of the specified rec eiving functio n for the broadcasting source.

• The teleconference terminal name can be indicated on the screen of terminal with the superimpose using by [SITE LIST] key on remote controller. When setting the system parameter, the teleconference terminal name registered is trans ferred t o all of the ter minals on connect ing. Usin g the console command, the terminal name can be changed temporarily.

• The teleconference terminal is identified by beginning “1” number (teleconference number) assigned by MCU 5000A.

• H.242 capacity conversion function can adjust the line rate between the different line rate terminals on the MCU 5000A side.

Page 8 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

• Any still picture signal can be sent to all of the terminals. ([STILL SEND]

key on remote controller)

• The camera sendin g the sign als can be co ntrolled r emotely from rece iving

terminal. ([ LC/RT] key on remote controller.)

• Message tone can be sent to all of the terminals.

• Message can be sent optionally to the any terminal.

• Remote control operation can be inhibited by console.

• The control function between terminals can be performed via MCU

5000A.

Multipoint Lecture Connection

3.14

Tele-education connecting conception is basically the same as the multipoint conference. All of the teleconference terminals are identified the instructor site and classroom. The instructor site has an management privilege. This system is available using the optional software for tele-education connection. The following features is provided.

• As well as the multipoint conference, one MCU 5000A has the ability to connect to eight terminals, and two MCU 5000A cascade-connection has maximum 14 terminals in this one tele-education connecting system. One MCU 5000A has the ability to contain the two grou ps of the tele-education and multipoint teleconferences within maximum eight terminals per one group. (Possible to contain the different line rate.)

• The instructor sit e is specifie d when beginnin g lesson. (one ins tructor sit e per one group.)

• In normal state, the audio signal of the instructor site is sent to the classroom in one way di rec ti on, and the audio signal s fr om the classroom to the instructor site is in off state. The command of the instructor site allows to mix the audio signal of the classroom.

• The instructor site optionally allows to originate from classroom. The classroom to be permitted to originate is selected by [TK ALW]+[SITE SELECTION] keys. Continuous depressing [SITE SELECTION] key permits to keep originating only one teleconference terminal. The plural classroom are abl e to originate s imultaneously by the depressing repet ition of [TK ALW]+[SITE SELECTION] keys. The console flexibly permits/ inhibits to originate from each classrooms. (includes the instructor site originating).

• The picture on screen for the instructor site is the last classroom or originating classroom. Though the picture of the instructor site is continuously sent t o the classroom in operati on, the picture from inst ructor site to classroom can be switched to the originating classroom picture by the command from the instructor site. ([INS/TK] key on remote cont roller in case that the originating classroom exists.) Using the console, the broadcasting from the specific teleconference terminal can be performed.

• The tele-education conn ecting mode in hibits [OPR] and [LOCAL SEND] keys. [SLCT RCV], [VOICE ACTIVA TE], and [SITE SELECTION] keys are available to the instructor site only.

NECA 340-414-100 Revision 2.0 Page 9

General Description Manual MCU 5000A Multipoint Control Unit

• When the classroom permitted to originate does not exist, the instructor site has the application to switch receiving video signal temporally by [SITE SELECTION] key. When its existence, [SITE SEL ECTION] key is not prohibited.

• [SLCT RCV] key operation of the instructor site can select the receiving picture to the in str uctor site. In recei ve s electing mode, the other function keys ([TK ALW] key etc.) is prohibited. This application is not available to the classroom.

• When the classroom permi tted to origi nate exists , the talker pic ture can be automatically switched between the instructor site and classroom by the voice (talker) detect ion. The voice ( talker) detect ing op eration ON/OFF is performed by [VOICE ACTIVATE] key at the instructor site. This application is not available to the classroom.

• The classroom can request to originate for the instructor site ([TALKER RQT] key on re mote controller). If requesting to originate, the teleconference terminal number on the display of each terminal changes from blue indication to red flashing. When canceling the request ([T ALKER CANCEL] key), the teleconf erence terminal number return s to blue indication. The instructor originating command turn to the red indication.

• The instructor site has the ability to cancel forcibly the originating request from the classrooms ([TK CNL] key on remote controller).

• The instructor si te inhibits the originat ing request fr om the class room, and then can switch to t he picture of t he instructor s ite using [STAR T] and [TK CNL] keys. The [START] key holds the originating request, and [TK CNL] key forcibly cancels the origina ting request.

• Any still picture transmission is available to the instructor site and classrooms permitted to originate.

• The camera (sending the signals) control operation is available to the instructor site only.

Page 10 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

E: Teleconference

Start and Completion

3.15

The teleconference start and completing operation is performed by the

console command. Refer to

• Point-to-Point teleconference

Start: BCON command (Point-to-point connection)

Completion: BDSC command (Point-to-point connection release)

• Broadcasting teleconference

Start: UCON command (One way direction connection)

LCON command (One way direction monitor connection)

Completion: UDSC command (One way direction connection release) LDSC command (One way direction monitor connection release)

• Multipoint teleconf erence

Start: MCON command (Multipoint connection)

MCNR command (Cascade-connection)

NECA 340-414-300

Completion: MDSC command (Multipoint connection release)

MDCR command (Cascade-connection release)

• Tele-education

Start: ECON command (Tele-education connection)

MCNR command (Cascade-connection)

Completion: EDSC command (Tele-education connection release)

MDCR command (Cascade-connection release)

• Multipoint Teleconference (RCON: H.243 mode)

Start: RCON command (Multipoint connection)

Completion: RDSC command (Multipoint connection rele ase)

NECA 340-414-100 Revision 2.0 Page 11

General Description Manual MCU 5000A Multipoint Control Unit

F: Line and

Teleconference Terminal Number

3.16

The MCU 5000A accommodates the plural lines. To simultaneously

perform the plural terminals, the line and teleconference terminal numbers is assigned. The line and teleconference terminal numbers are as follows.

• Physical line number (1 to 16)

• Logical line number (1 to 254, or 0)

• Teleconference port number (1 to 8)

• Teleconference terminal number (1 to 14, or 0)

Physical Line Number

3.17

The MCU 5000A rearplate contains sixteen connectors for line

connection. The private line, TA, and Multiplexer (MMM) etc. can be connected to the rearplate. The usable physical line number (value of 1 to 16) determines according to the LIF unit type and mo unting cond ition. Acco rdingly ea ch LIF unit is assigned physical l ine number (LIF1 to LIF4) respe ctively. The usable physical number with LIF unit type is required as shown in the following Table 3-1.

Logical Line Number

3.18

Each LIF unit line capa city is T1 =1536 kbps: 24 time slots, RS-422=19 20

kbps: 30 time slots, ISDN=1 472 k bps: 23 t ime sl ots respectively. The number of time slot per line is different in accordance with the line rate. The number is assigned according to this time slot is the logical number. This number, which is specified the LIF1 through LIF4 unit (maximum 48 per unit), is the value of 0 through 254. (Value 0 is available to the multipoint connecting command (MCON/ECON) operation only.) The line rate in the system parameters is defined to each LIF unit, and the relation of one physical line and logical line numbers (Usable logi ca l line number p er phys ica l li ne) is shown in the Table 3-2. (The mixture of ISDN, T1, and RS-422 is available.)

Table 3-1: LINE RATE

UNINSTALLED T1 (1.5M-LIF) RS-422/HSD ISDN (B, 2B, H0)

LIF1 Not applicable 01 , 02, 03, 04 01, 02, 03, 04 01, 02 LIF2 Not applicable 05 , 06, 07, 08 05, 06, 07, 08 05, 06 LIF3 Not applicable 09, 10, 11, 12 09, 10, 11, 12 09, 10 LIF4 Not applicable 13 , 14, 15, 16 13, 14, 15, 16 13, 14

Table 3-2: Number of Logical Lines

Line Rate (kbps) 64 128 192 256 384 512 768 1152 1536 1920

Number of Logical Lines

Page 12 NECA 340-414-100 Revision 2.0

T1 24128643211 RS-4221111111111 ISDN 23 3

MCU 5000A Multipoint Control Unit General Description Manual

(Time Slot)

LIF1

LIF2

3.19

The logical line number is assigned 1 through 254 from LIF1 to LIF4 in sequence within the logical line number range of system parameter. The assigning requirement of more than two logical line number per physical line is available for the multiplexer (MMM) usage.

When the line rate is 1536 kbps (T1×2 unit installation) and the logical line number is six, to MCON-connect the physical line number 1 to 3, assign MCON 1, 2, 3 as the following Fig. 3-2 (a).

024Logical Line Number Physical Line Number

2 3 4 7

1 2 3 4 7

(Time Slot)

LIF1

LIF2

(a) Line Rate 1536kbps

When the line rate is 384 kbps (T 1×2 unit ins tallation) and the logical line number is ten, to MCON-connect the physi cal l ine number 1 to 3, assign MCON 1, 5, 9 as the following Fig. 3-2 (b).

024Logical Line Number Physical Line Number

1 5

Not Used

2 6

Not Used

3 7

Not Used Not Used

1 2 3 4 Not Used 7

* When these time slots are used, multiplexer (MMM) is required.

(b) Line Rate 384 kbps

Figure 3-2: Logical Line Number Assignment

NECA 340-414-100 Revision 2.0 Page 13

General Description Manual MCU 5000A Multipoint Control Unit

G: Logical Line

Number Assignment on ISDN Interface Unit Installation

(Time Slot)

LIF1

LIF2

(Time Slot)

LIF1

LIF2

3.20

This requires the different procedure with minimum line rate (system parameter) setting. The logical line number is assigned according to the relation of minimum line rate an d communica tion r ate as s hown in t he Fig . 3- 3, 3-4, and 3-

024Logical Line Number

2526 2728

4950

5152

....................

22 46 47

(a) Communicating by 64 kbps

024Logical Line Number

25 27

....................

19 21

43 45

(Time Slot)

LIF1

LIF2

(b) Communicating by 2×64 kbps

024Logical Line Number

55 61

Figure 3-3: Logical Line Number Assignment (line Rate 64 kbps)

Page 14 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

024Logical Line Number

(Time Slot)

LIF1

LIF2

LIF1

LIF2

26 27

....................

13 14

(a) Communicating by 64 kbps

024Logical Line Number

13 14

....................

(b) Communicating by 2×64 kbps

10 22

22 23

11 23

(Time Slot)

024Logical Line Number

LIF1

LIF2

28 31

Figure 3-4: Logical Line Number Assignment ( Line Rate 2×64 kbps)

NECA 340-414-100 Revision 2.0 Page 15

General Description Manual MCU 5000A Multipoint Control Unit

024Logical Line Number

(Time Slot)

LIF1

2 6

(Time Slot)

LIF2

LIF1

LIF2

LIF1

10 11

(a) Communicating by 64 kbps

024Logical Line Number

1 5

2 6

10 11

(b) Communicating by 2×64 kbps

024Logical Line Number

LIF2

10 11

Note:

The assignment of logical line number by the number of lines conforms to

T1 interface.

Figure 3-5: Logical Line Number Assignment (Line Rate 384 kbps)

Page 16 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

Teleconference Port Number

3.21

The MCU 5000A provides maximum eight points in multipoint teleconference. MUX uni t port n umber in th at multip oint t eleconf erence i s called the teleconference port number that is the value of 1 through 8. Eight-point teleconference contains the value of 1 through 8, and 4-point teleconference contains the value of 1 through 4 in the valid teleconference port number. When multipoint connecting mode, one teleconference port number per logical line number is assigned continuously beginning minimum number. The teleconference port number of the cascade-connecting mode is assigned continuously beginning maximum number.

Teleconference Terminal Number

3.22

The teleconference terminal number is assigned from beginning “1” to both A and B groups respectively using the multipoint connection command issue. One MCU 5000A contains the number 1 through 8. (Amount of two groups is less than 8.) The cascade-connection mode contains number 1 through

14. When multipoint connection, one teleconference terminal number has one logical line number ex cept ca scade p ort. The telec onferenc e termi nal numbe r “0” assignment has the simultaneous activity for all of the teleconferences in the group.

NECA 340-414-100 Revision 2.0 Page 17

General Description Manual MCU 5000A Multipoint Control Unit

H: Line Interface 3.23

interface. The MCU 5000A accommodates maximum four individual LIF units. Mixed LIF unit combination is also available. The individual interfaces are identified automatically by software. Any item of the line rate and line number etc. In the system parameter is required as following per each unit.

1.5M LIF Unit

3.24

not using the multiplexer, the number of usable lines is four lines which use the head of time slot for individual line rate. However, the multiplexer usage increases the more number of usable line owing to mult iplex the plur al lines for one channel. As for the following items, the system parameter setting is required to every 1.5M LIF unit.

Line rate and logical line number (+30H to +37H):

The MCU 5000A provides the following 3 types of LIF unit for the line

Four number of channels ar e accommodated in one 1.5M LIF un it . When

• 64 kbps/56 kbps: 0 to 96 lines

• 64 kbps x 2/56 kbps x 2 0 to 48 lines

• 128 kbps/112 kbps: 0 to 48lines

• 192 kbps/168 kbps: 0 to 32 lines

• 256 kbps/224 kbps: 0 to 24 lines

• 384 kbps/336 kbps: 0 to 16 lines

• 384 kbps x 2/336 kbps x 2 0 to 8 lines

• 512 kbps/448 kbps: 0 to 12 lines

• 768 kbps/672 kbps: 0 to 8 lines

• 1152 kbps/1008 kbps: 0 to 4 lines

• 1472 kbps/1288 kbps 0 to 4 lines

• 1536 kbps/1344 kbps: 0 to 4 lines

Frame format (+38H):

• ESF (24MF)

•F4

•F12

•F72

Line code (+39H):

•B8ZS

•AMI

• AMI (ZCS)

RAI type (+3AH):

•T1

•ISDN

Page 18 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

RS-422/HSD IF Unit

3.25

Four number of channels are accommodated in one RS-422/HSD IF unit which is normally used as LI F . The HSD interface is available with strap se tting. (Refer to

NECA 340-414-210

.) The RS-422 IF unit, which does not support multiplexed signal as 1.5M LIF unit, accommodates only four channels. The system parameter setting is as follows:

Line rate and logical line number (+30H to +37H):

• 64 kbps/56 kbps: 0 to 4 lines

• 64 kbps×2/56 kbps×2: 0 to 2 lines

• 128 kbps/112 kbps: 0 to 4lines

• 192 kbps: 0 to 4 lines

• 256 kbps: 0 to 4 lines

• 384 kbps/336 kbps: 0 to 4 lines

• 384 kbps x 2/336 kbps x 2 0 to 2 lines

• 512 kbps: 0 to 4 lines (Internal clock no activity)

• 768 kbps: 0 to 4 lines

• 1152 kbps: 0 to 4 lines (Internal clock no activity)

• 1536 kbps: 0 to 4 lines

• 1920 kbps: 0 to 4 lines (Internal clock no activity)

H0-INF Unit

3.26

Two number of channels are accommodated in one H0-LIF unit which is normally as ISDN LIF unit. The private interface can be used with strap setting. H0-INF unit accepts optional time slot by reason that ISDN network provides the multiplex function. The system parameter setting is as follows .

Line rate and logical line number (+30H to +37H):

• 64 kbps/56 kbps: 0 to 48 lines

• 64 kbps×2/56 kbps×2: 0 to 24 lines

• 384 kbps/336 kbps: 0 to 8 lines

• 384 kbps x 2/336 kbps x 2 0 to 4 lines

NECA 340-414-100 Revision 2.0 Page 19

General Description Manual MCU 5000A Multipoint Control Unit

Common Item for Each LIF Unit

I: Cascade-

Connection

3.27

The common setting items for each LIF unit are as follows.

Clock source (+3BH): The clock source is specified in the following clock mode.

• Automatically

• External clock of physical line number (1 to 16)

• Internal clock

Clock source mask: The physical line required to mask can be specified by bit in automatic mode of clock source.

3.28

When two MCU 5000As are cascade-connected, the number of the terminal in mu ltipoint teleconference become 14 terminals. Fig. 3-6 shows th e cascade-connection of two MCU 5000As. One (Master) of two MCU 5000As has the initiative contro ls to the other equipment (Slave).

3.29

The lines between the master and slave in near access is directly connected with through-pass, and if require, also the console is connected with through-pass. When two MCU 5000A are installed in far access (long distance), they are con nected usi ng the existing line (Private or ISDN). In this case, the console is connected via the modem.

3.30

In case of the multipoint or Tele-education connection, the slave terminal stands by after issuing the cascade line connecting reservation command (MCNR). Then the s lave re ceives the connect ing data after issuin g the c onnecting command (MCON or ECON) from the master, and the line connection in the slave side is completed. The reverse command issue order between the master and slave is al so a ccepted. In this ca se, the teleconfe re nce terminals in the mast er is first accepted. The terminals in the slave is just accepted at the time of the command is sue of the sl ave.

3.31

After connecting, all of the teleconference control commands within the group is entered f rom the master terminal . (not execute from the sl ave terminal.) The command indication is displayed on the master side. The request from the terminal (remote controller) is accepted at both of the master and slave the MCU 5000A.

3.32

One teleconference group is assigned to the slave MCU 5000A with the connecting command entering. One MCU 5000A provides two teleconference groups so that it can simultaneously contain both two groups of the slave and master with another cascade-connection or multipoint teleconference. Refer to

Fig. 3-7. In this case, the teleconference group in the master side is used. (The

teleconference in the slave side is ignored.)

Page 20 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

Console

RS-232C HSD

CH1

CH2

CH3

Console Through-Pass

CH4

LIF

Cascade Line

RS-232C HSD

CH1

CH2

CH3

CH4

Figure 3-6: Casade-Connection of Two MCU 5000A

MCU1 MCU2

Master

Slave

Master

LIF

J: Console Through-

Pass

Figure 3-7: Two Groups Casade-Connection

3.33

The MCU 5000A, which provides the three console ports, is simultaneously co ntr o l le d f rom the three consoles connected using the console through-pass with CH2/CH3 of the MCU 5000A. The plural MCU 5000As (maximum 9) can be controlled by one console. Fig. 3-8 shows for through-pass connection. Set individual identification code for system parameter to each MCU 5000A. The plural MCU 5000A are connected from smaller identification code of the MCU 5000A in sequence betwee n CH3 and CH2. (I n th is cas e, th e sys te m parameter of CH2/CH3 must be set “Console through-pass set”.) The operating console connects to CH1 in the MCU 5000A with smallest identification code.

3.34

When issuing the command from local console connected to CH1, to identify the individual MCU 5000A enter the command with the iden tification code in the head of the command. The command without the identification code is performed in local MCU 5000A connected to the console. The command with the identification code is transported until the identification codes of command and MCU 5000A match. The response for the command with identification code return to the originating MCU 5000A connected to the local console, and then is displayed on the cons ole. The r esponse to al l of t he MCU 5 000A can b e exec uted by system parameter setting. For that parameter refe r to

NECA 340-414-220

NECA 340-414-100 Revision 2.0 Page 21

General Description Manual MCU 5000A Multipoint Control Unit

K: Supplementary

Functions

3.35

The following supplementary functions are provided.

Automatic Start Setting Function

3.36

The teleconference opening is normally performed by the command entering from the console, MCU simple control terminal, or the te leconferenc e reservation system. The opening system with multipoint connection is particularly provided. Automatic Start Setting function is that the multipoint connection is automatically set by power on. This setting method is that the connecting command for aut omatic starting is register ed in the memory card using CGPR command from the console. Refer to

NECA 340-414-300

Memory Card Copy Function

3.37

be copied another memory card. Refer to

Using the console command (CPMC), the data in the memory card can

NECA 340-414-300

Loopback Function

3.38

video, audio, and data. Refer to

The MCU 5000A provides the local/remote loopback function for line,

NECA 340-414-500

Console

Local

MCU1

Identification Code = 00H

Figure 3-8: Example of Console Through-Pass Connection

Local

MCU2 MCU3

Identification Code = 10H

Local

Identific ation Code = 20H

Page 22 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

4: HARDWARE CONFIGURATION

4.01

The MCU 5000A consists of the units in the Table 2-1 in paragraph 2.01.

Fig 4-1 shows the MCU 5000A block diagram.

MUX DATA R LINE DATA R LINE DATA S

LB BUS PG BUS

CH1

CH2

CH3

CH4

I N E

CH5

CH6

CH7

LIF "1"

T1 or

RS-422

LIF "2"

T1 or

RS-422

CPU BUS

8 8

MUX DATa S PG BUS LSD S, R

EC H221

MUX

"1"

EC H221

MUX

"8"

CPU BUS

4 4

A CODEC

"1"

A CODEC

"2"

A SUM

CH1

R S

CH2

CH3

3 2 C

CH4

PG/S IO

M CONT

V SW/LSD

HSD IF

CH2

CH3

CH4

HSD

CH1

CH2

CH3

CH4

DCV

+5 +12 -12

PWR

AC IN

100/200 V

Figure 4-1: Block Diagram of MCU 5000A

NECA 340-414-100 Revision 2.0 Page 23

General Description Manual MCU 5000A Multipoint Control Unit

A: 1.5M LIF Unit General

4.02

1.5M LIF unit receives AMI (B8ZS) signal from 1.544 Mbps transmission line, extracts the clo ck pulse with IPAT (PEB2235), converts bipolar signal to unipolar, and sends it to ACFA (PEB2035). ACFA detects frame synchronization and transmission line fai lu re . ACFA converts incoming s ign al to standard signal (Octet pulse 8 kHz, 4 MHz clock) within the equipment by the elastic memory in LSI, and outputs to MTSC (PEB2045). MTSC arranges the outgoing line (minimum 64 kbps: per 1 time slot) to out the signals from the four transmission lines to the multipoint teleconference data bus with CPU control.

4.03

Contrariwise, MTSC arranges the outgoing line to send each signal from the data bus to the corresponding ACFA, and send it. ACFA adds frame signal, converts bit rate fr om 2.04 Mbps to 1.544 Mbps, and sends the converted s ignal to IPAT. IPAT converts the signal from unipolar to 1.544 Mbps AMI (B8ZS), and sends it to the transmission line. If a transmission line failure occurs the unit sends RAI with CPU control. Furthermore, the loopback for line side and within the equipment can be executed independently, and also the LED lights for line failure.

Functions

4.04

This unit provides the following functions.

(1) Prima ry Tributary Access

• Four output/input ports for 1.544 Mbps interface (B8ZS) is accommodated.

• Clock extraction and frame synchronizing detection is executed in every line.

(2) Line Loopback

• The loopback for line side and within the equipment can be executed independen tly with CPU control.

(3) Alarm Indication

• The line alarm per channel is indicated.

(4) Selection of Receive Clock for synchronization

• The one clock source in line 1 throug h 4 is selected with CPU contro l, and the received clock signal for synchronization is sent to PG unit.

(5) Data Multiplex

• When the data signal of the plural teleconferences is multiplexed by Multiplexer (MMM), the data multiplexing/demultiplexing per 64 kbps time slot is pe rformed.

Page 24 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

Functional Block Diagram

1.544 Mbps LINE INF 1

1.544 Mbps LINE INF 2

1.544 Mbps LINE INF 3

1.544 Mbps LINE INF 4

IPAT

4.05

Fig. 4-2 shows 1.5M LIF unit block diagram.

OSP, 4M CLK

ACFA

MULTICONFERENCE DATA BUS

(LD S/R)

ACFA

MTSC

ACFA

POINT-TO-POINT CONFERENCE BUS

(LB)

ACFA

TO/FROM MUX UNIT

TO/FROM LIF 2, 3, 4

CPU BUS

RELAY

LOOPBACK

LED

SW ID

Figure 4-2: Block Diagram of 1.5M LIF Unit

1.5M LIF Unit Interface

(1) Table 4-1 shows the electrical specification. This interface conforms to ITU-TS G.703, I.431.

Table 4-1: Electrical Specification

ITEM SPECIFICATION

Transmission Rate 1.544 Mbps ±50 ppm (Data rate : 64 to 1536 kbps, 64k step) Line code AMI (B8ZS) Frame 12/24 Multiframe format Pulse amplitude 3.0 ± 0.7 V Spectrum half width 324 ± 38 nsec Impedance 100 _ balanced Equalizing distance 0 t o 210 m 7 steps programmable setting Connector D-sub 15 pin female

ICU

(UPD71059)

NECA 340-414-100 Revision 2.0 Page 25

General Description Manual MCU 5000A Multipoint Control Unit

(2) Table 4-2 and Fig. 4-3 shows 1.5M LIF Connector Pin Assignment

Table 4-2: 1.5M LIF (CH1 to CH16) Signal Assignment

PIN NO. SIGNAL NAME I /O REMARKS PIN NO. SIGNAL NAME I /O REMARKS

1 SHIELD Cable shield 9 T (B)+ OUT Transmitting Data (B) 2 T (A)- OUT Transmitting Data (A) 10 3 - 11 R (B)+ IN Receiving Data (B) 4 R (A)- IN Receiving Data (A) 12 5- 136- 147- 158 SG Signal ground

-: Not Used

Figure 4-3: 1.5M LIF (CH1 to CH16) Connector Pin Assignment

Page 26 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

Line Management

Table 4-3: User Side Primary Tributary Rate Layer 1 Status Transition (Pick-up)

STATE DEFINITION STATE DEFINITION NEW RECEIVE EVENT NEW RECEIVE EVENT NEW RECEIVE EVENT NEW RECEIVE EVENT NEW RECEIVE EVENT NEW RECEIVE EVENT

4.06

The MCU 5000A manages for line st at e ac cor ding to the following Table

4-3.

INITIAL STATE F0 F1 F2 F3 F4 F5

Operation or Failure state Signaling for Interface

Power OFF

Power ON Normal Active Frame

from Network RAI Receive Out of Frame or Loss of

Signal AIS Receive

Power OFF

(user side)

No Data Normal

/ F0F0F0F0F0

F5/////

/ _ F1 F1 F1 F1

/ F2 _ F2F2F2

/ F3F3 _ F3F3

/ F4F4F4 _ F4

Active FC1 FC2 FC3 FC4

Active Frame

Normal

Active Frame

Frame with

RAY

Frame with

RAY

Active Frame

_: Not transit /: Not existed Fz: Transit to Fz state TABLE 4-3

Normal

NECA 340-414-100 Revision 2.0 Page 27

General Description Manual MCU 5000A Multipoint Control Unit

B: RS-422 LIF Unit General

4.07

The RS-422 Line Interface unit receives a signal with RS-422 level

(corresponds to X.21) f rom a tra nsmission li ne. After extract ing the cloc k pulse, TTL level and bit rate within the equipment conversion is performed. The processed signal is detected H.221 frame synchronization, and then output to MTSC (PEB2045).

4.08

The MTSC arranges the outgoing l ines (minimum 56 kbp s per 1 time slot )

to output the signals from the four transmission lines to the multipoint teleconference data bus with CPU control.

4.09

Contrary, the RS-422 LIF unit arranges the outgoing lines to send each

signal from the data bus to the cor respondin g line on MTSC, converts the bit rate from 2.048 Mbps to that of the transmissio n l ine sends it to the tr ans m is sion line. The loopback for line side and within the equipment can be executed independently, and also the LED lights for line failure. This unit provides DTE interface.

Functions

(1) Line Interface

• Four RS-422 (corresponds to X.21) interface is accommodated.

• Clock extraction and f rame synchron izing de tection are executed in every line.

• In 56 kbps×2 or 64 kbps×2, the phase compensation is performed.

(2) Loopback

• The near-end/far-end remote loopback can be executed independe ntly with CPU control.

(3) Alarm Indication

• The line alarm per channel is indicated with CPU control.

(4) Selection of Receive Clock for synchronization

• The one clock source in li ne 1 t h ro ugh 4 (s ending/receiving 4) is selected with CPU control, and the rec eived clock signal fo r synchronization is sen t to PG unit.

Interface Specification

(1) Table 4-4 shows electrical specification

Table 4-4: Electrical Specification

ITEM SPECIFICATION

Transmission Rate 56/56×2/64/64×2/128/192/256/384/768 kbps/1.5/1.92 Mbps Electrical Interface ITU-TS X.21 equivalent (X.27, V.11) Connector D-sub 15Pin Female

Page 28 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

(2) Table 4-5 and Fig. 4-4 show RS-422 LIF Connector pin assignment.

Table 4-5: RS-422 LIF (CH1 to CH16) Signal Assignment

PIN NO. SIGNAL NAME I /O REMARKS PIN NO. SIGNAL NAME I /O REMARKS

1 SHIELD Cable shield 9 T (B)+ OUT Transmitting (B) 2 T (A)_ OUT Transmitting Data (A) 10 C (B)+ OUT Control (B) 3 C (A)_ OUT Control (A) 11 R (B)+ IN Receiving (B) 4 R (A)_ IN Receiving Data (A) 12 I (B)+ IN Indication (B) 5 I (A)_ IN Indication (A) 13 S (B)+ IN Timing (B IN) 6 S (A)_ IN Timing (A IN) 14 S (B)+ OUT Timing (B OUT) 7 S (A)_ OUT Timing (A OUT) 15 FG Frame Grou nd 8 SG Signal ground

Figure 4-4: RS-422 LIF (CH1 to CH16) Connector Pin Assignment

NECA 340-414-100 Revision 2.0 Page 29

General Description Manual MCU 5000A Multipoint Control Unit

(3) Fig. 4-5 shows the Block diagram of RS-422 LIF unit.

IN OUT

14 14

OUT IN 14 14

IN OUT 14 14

OUT IN 14 14

PORT1

LIF LEVEL CONV

OUT

T E R M

I N A L 1

PORT2

OUT

RATE CONV

LIF LEVEL CONV RATE CONV

SYNC SYSTEM

IN1 OUT1

IN2 OUT2

H221 SYNC DET

MTSC

DELAY

MUX

TERMINAL1 B1 + B2

MULTI FRAME TS31

SYSTEM

SYNC

IN1

OUT1

IN2

OUT2

EC H221 MUX (LD S/R)

PORT3

LIF LEVEL CONV

OUT T E R

I N A L 2

PORT4

OUT

RATE CONV

LIF LEVEL CONV RATE CONV

IN3 OUT3

IN4 OUT4

H221 SYNC DET

DELAY

MUX

TERMINAL2 B1 + B2

MULTI FRAME TS31

IN3

IN4

OUT3

OUT4

IN OUT 14 14

OUT IN 14 14

IN OUT 14 14

OUT IN

14 14

POINT-TOPOINT LINE BUS (LB)

(a) 2 Port for 1 Terminal [2 x B]

H221 SYNC DET

MTSC

DELAY

MUX

SYNC

IN1

IN2

PORT1

I N A L 1

E R M

N A

L 2

T E R M

I N A L 3

R M

I N A L 4

OUT

PORT2

OUT

PORT3

OUT

PORT4

OUT

LIF LEVEL CONV RATE CONV

LIF LEVEL CONV RA TE CONV

IN3

IN4

NOT USED

SYNC

OUT1

OUT2

OUT3

OUT4

NOT USED

EC H221 MUX (LD S/R)

IN OUT 14 14

OUT IN 14 14

IN OUT 14 14

POINT-TOPOINT LINE BUS (LB)

OUT IN 14 14

IN OUT 14 14

OUT IN 14 14

IN OUT 14 14

OUT IN

14 14

(b) 1 Port for 1 T erminal

Figure 4-5: Block Diagram of RS-422 LIF Unit

Page 30 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

C: H0-INF Unit General

4.10

The H0-INF unit receives 1.5 Mbps data signal from ISDN line. After extracting the c lock pulse in IPAT, bipolar to unipola r conversi on is exec uted, a nd sends it to ACFA. ACF A p erforms frame synch roniza tion, inte rnal data h igh-way bit rate conversion, and detection of transmission line failure for the data signal, and sends it to MT SC. MTSC p er for ms t he line setting wi th ti me s lot ( 1 time slot per 64 kbps) t o out put t he data sig nal o f two po rts to the multi point tel eco nferen ce data bus (LMB) and point-to-point teleconference data bus (LB).

4.11

This unit se nds the recei ve data signal for D ch control to PIIFC from the receive data bus between ACFA and MTSC. PIIFC protocol-converts the receive data signal of the D ch (time slot 24) specified at HSCX.

4.12

The port to which the data signal from individual teleconference data bus is sent is specified by MTSC, and sends the data signal to ACFA. ACFA performs the bit rate conversion from internal data high-way (2 Mbps) to line rate (1.5 Mbps) and frame addition, and sends it to IPAT. IPAT sends the data signal, which is converted unipolar to bipolar, to ISDN transmission line.

4.13

The data signal of time slot 24 only from HSCX of PIIFC in D ch is multiplexed, and sends the multiple xed signal to th e transmi ssion dat a path from MTSC to ACFA . Furthermore, the loopback for line side and within the equipment can be execute d indepe ndently, and also the LED lights for lin e failur e. This unit provides DTE interface.

Functions

(1) ISDN line Access

• 2 ports of the primary tributary bit rate interface per panel are provided.

• One port accommodates three channels.

• D ch protocol conversion is executed in PIIFC.

• T1 (private line) interface is available with the parameter setting.

(2) Line Setting

• The line setting per channel unit is possible.

• Teleconference type can be selected with multipoint connection or pointto-point connection path.

(3) Selection of Receive Clock

• The receive clock from any connec tion port i s selec ted with CPU control. The extracted clock signal is sent to PG/SIO unit.

(4) Line Alarm Indication

• The line alarm per channel is indicated.

(5) Remote/Local loopback

• Remote/Local loopback per port is performed with CPU control.

NECA 340-414-100 Revision 2.0 Page 31

General Description Manual MCU 5000A Multipoint Control Unit

PORT2

PORT1

DEBUG2

DEBUG1

RELAY

LED

DIP SW

LED

DIP SW

232C

4.14

Fig. 4-6 shows block diagram of H0-INF unit.

IPAT#2

IPAT#1

PIIFC

CPU G/A ROM RAM HSCX

ACFA#2

ACFA#1

ICU

(TS24)

DCL (2M)

MTSC#4

DCL (2M)

MTSC#3

DIP SW

LED

MTSC#2

MTSC#1

LDS

LDR

INT

CPU BUS

CLOCK (4M, 8K)

+5V

H221 MUX

Figure 4-6: Block Diagram of H0-INF Unit

Page 32 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

H0-INF Unit Interface

(1) Table 4-6 shows the electrical specification. This interface conforms to ITU-TS G.703, I.431.

Table 4-6: Electrical Specification

ITEM SPECIFICATION

(2) Table 4-7 and Fig. 4-7 shows H0-INF Connector Pin Assignment.

PIN NO. SIGNAL

NAME

SHIELD Cable shield

T (A)- OUT Transmitting Data (A)

R (A)- IN Receiving Data (A)

SG Signal ground

Table 4-7: H0-INF (CH1 to CH6) Signal Assignment

I /O REMARKS PIN NO. SIGNAL NAME I /O REMARKS

T (B)+ OUT Transmitting Data (B)

9 10 11 12 13 14 15

R (B)+ IN Receiving Data (B)

Figure 4-7: H0-INF (CH1 to CH16) Connector Pin Assignment

NECA 340-414-100 Revision 2.0 Page 33

General Description Manual MCU 5000A Multipoint Control Unit

D: EC H211 MUX

Unit

General

4.15

In EC H211 MUX unit, t he rec ei ved dat a si gna l f ro m term ina l CODEC vi a LI F unit is synchronized with H.221 or multiframe. This unit also demultiplexes the synchronized data sig nal to t he audio coding da ta, vid eo codin g data, an d MCU Contro l Data. This unit also multiplexes the sum-processed audio coding signal in A CODEC and A SUM units, converted video coding signal in V SW/LSD IF unit, and LSD, and sends the multiplexed data signal to LIF unit. In this time, The control data, alarm and bit error rate data are tra nsferre d betw een MCU 5000As via servi ce channe l with H.221 frame.

4.16

This unit is assigned one unit per one teleconference terminal in multipoint teleconference. Maximum 8 units can be mounted in a subrack.

Functions

• H.221 synchronizing detection or synchronizing phase adjustment.

• Multiplexing and demultiplexing for the data signal in service channel.

• Conversion to H.221 synchronous signal.

• Alarm detection

• Loopback test and Self-diagnosis

Page 34 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

TO/FROM LIF (LD S/R)

LD1 IN

LD2 IN

LD3 IN

LD4 IN

4-1

SEL

4.17

Fig. 4-8 shows block diagram of EC H221 MUX unit.

MTSC

H221

SYNCHRONIZATION

DETECTOR

CPU

DELAY

CONT

DMUX

DIST

LD1 OUT

LD2 OUT

LD3 OUT

LD4 OUT

V SW/LSD A CODEC (MD-R)

V SW/LSD (LSD)

LD1 OUT

LD2 OUT

LD3 OUT

LD4 OUT

DIST

MUX

CPU INF

Figure 4-8: Block Diagram of EC H221 MUX Unit

4-1

SEL

LD1 IN

LD2 IN

LD3 IN

LD4 IN

FROM PG/S IO

TO M CONT

V SW/LSD A CODEC (MD-S)

NECA 340-414-100 Revision 2.0 Page 35

General Description Manual MCU 5000A Multipoint Control Unit

E: V SW/LSD IF Unit General

4.18

The V SW/LSD IF unit swit ches the video signal bet w ee n RD I N and SD OUT from EC H221 MUX unit. This unit receives the low-speed data demultiplexed from service channel in EC H221 MUX unit, and the proceed lowspeed data is sent back to the EC H221 MUX unit.

Functions

(1) V SW

This unit sends the video signal of the transmitting teleconference

terminal received from the EC H221 MUX bus (MD-R) to EC H221

MUX bus (MD-S) of the receiving terminal. The video signal of

maximum 8 points can be switched.

(2) LSD IF

Receiving/sending low-speed data within the data from service data. The

monitoring function is provided. low-speed data with frame format of

HDLC frame is sent/received from HDLC controller (HSCX). The data

of the electrical whiteboard (option) and MCU control is sent/received

through LSD between the terminal and MCU 5000A.

(3) LED

LEDs indicate the teleconference, originating, and operator terminal are

provided.

(4) PN Pattern Generator/Checker

The test functions for this unit and other unit in the MCU 5000A are

provided.

Page 36 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

DETECTING

ERROR

PN PATTERN CHECKER

BURST CLK

4.19

MTSC

OUT

TDB

TSC

MTSC

DINOUT

TSC

4MCK -

2MCK -

HC273

Fig. 4-9 shows the block diagram of V SW/LSD IF unit.

HC151

TSC

HC151

C B A

TSC

C B

TDH

TEST

HC138

MDR

MDS

BURST CLK

PN PATTERN CHECKER

TDS

TEST: TESTING CONTROL VLB: VIDEO LOOPBACK TSC: TBY ST ATE CONTROL TDR: PN PATTERN OUT

C B

VLB

Figure 4-9: Block Diagram of V SW/LSD IF Unit (1of 2)

NECA 340-414-100 Revision 2.0 Page 37

General Description Manual MCU 5000A Multipoint Control Unit

LSD R IN

LSD S OUT

SEL

R x D1 T x D1 T x CK1 R x D2 T x D2 T x CK2

H S C X

CPU BUS

V11 CLK

2M CLK 4M CLK

D71054 DIST

Figure 4-9: Block Diagram of V SW/LSD IF Unit (2 of 2)

CN3

LSD R0

LSD S0 LSD CK0

Page 38 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

F: A CODEC Unit 4.20

Two A CODEC units can be installed in a MCU 5000A subrack (Total eight channels per subrack).

(1) The received audio coding signal (64/56/48 kbps, µ-law PCM or SB-

(2) The received audio decoding signal is subtracted from the added PCM

Functions

(1) Audio Signal Decoding

The A CODEC unit, which accommodates four audio channels per unit.

ADPCM) from multiplexing /demultip lexing pa rt (EC H221 MUX unit) is decoded to PCM signal (8 kHz×14 bit or 16 kHz×16 bit). The output level is adjusted with attenuator, and is sent to the audio summing (A SUM) unit as the received audio decoding signal.

signal from the audio summing part (A SUM unit), and the summed signal is compress-coded with 64/56/48 kbps or µ-law PCM/SBADPCM. The compress-coded signal is sent to the multiplexing/ demultiplexing part (EC H221 MUX unit).

The received audio coding signal (64/56/48 kbps, µ-law PCM or SBADPCM) from multiplexing /demultip lexing pa rt (EC H221 MUX unit) is decoded to PCM signal (8 kHz×14 bit or 16 kHz×16 bit).

(2) Audi o Level Detection

The decoded PCM signal is smoo thed f or a ti me (cal led “f rame”) , and th e mean power as the resul t of the s moothing is sent t o the au dio sum part (A SUM unit) and control pa rt ( M CONT u nit ) as audio level. (1 fr ame: 20.0 msec, fram e position f r ee)

(3) Voice Detection

This unit verifie s with audio level whethe r the incomi ng audi o sign al is in voice or non-voice frame, and sends it to the audio sum part (A SUM unit) and control part (M CONT unit). The threshold level can be set between -36 and -12 dBm by the M CONT unit and dip switch.

(4) Talker Detection

The unit send talker detection signal, which is made voice detection signal with forward/bac kward guar d time. Forwar d guard ti me can be set the 10 to 630 ms, and backwar d guard time c an be s et th e 10 t o 310 ms b y dip switch and M CONT unit.

(5) Load Insertion

As the talker information from A SUM unit. The unit inserts load to the coded PCM signal.

(6) Audio Signal Substructing

The received audio de coding signal is s ubtrac ted f rom the summing PCM signal in the audio sum part (A SUM unit).

NECA 340-414-100 Revision 2.0 Page 39

General Description Manual MCU 5000A Multipoint Control Unit

(7) Audio Signal Coding

The subtracted PCM signal is compr ess-c oded with 64/ 56/48 kb ps, µ-law

PCM or SB-ADPCM. This signal is sent to the multiplexing/

demultiplexing part (EC H221 MUX unit) as send audio coding signal.

(8) Muting

When receiving the muting signal from the control part (M CONT unit),

the receive audio decoding signal (MUTE 1) or substructed summing

PCM signal (MU TE 2) is muted.

(9) Test Tone Output

The test tone is ins erte d to t he rec eive a udio dec oding s ignal (T ONE 1) or

substructed summing PCM signal (TONE 2) by specifying the level

signal (4 stages) and frequency number (4 st ages) from the control part

(M CONT unit).

(10) Loopback

The remote and local loopback are simultaneously performed by setting

loopback from the control part (M CONT unit).

Note:

These functions above are independent in every channel. The different

function can be set per each channel. Table 4-8 shows the voice signal

level setting value, and Fig. 4-10 shows the block diagram of A CODEC

unit.

Table 4-8: Voice Signal Level Setting Value

µ-law PCM SB-ADPCM

Standard Level

Level Range

Standard Level -9 dBrm -9 dBrm (Maximum Average) (4.5 VU) (Voice Signal Level) Peak Factor 9 dB (3 σ) 15 dB Overload Allow an c e 3 dB 3 dB Overload Level +3 dBm +9 dBm Overload Point +3 dBm 0 (G.711) +9 dBm 0 (G.722)

4WS 0 dBr 0 dBr 4WR 0 dBr 0 dBr 4WS + 7.5 to -8 dBr +4 to -11.5 dBr 4WR +4 to -11.5 dBr +2 to -13.5 dBr

Page 40 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

VOICE POW

LOOP MUTE1

TONE1 THR BP FP

INFORMATION DATA

64/56 kbps VOICE DATA (RECEIVE)

64/56 kbps VOICE DAT A (SEND)

MUTE2

(+5v)

SB-ADPCM

DECODER

64 kbps

µ-Law PCM

DECODER

SB-ADPCM

DECODER

64 kbps

µ-Law PCM

DECODER

TEST TONE

OSCILLATOR

VOICE LEVEL

CALCULA TION

FRQLEVTONE2ASEL

VOICE

DETECTION

ATTENUATION

SPEECH

DETECTION

DELAY

M U X

VOICE POWER INFORMATION DAT A

ATT ENUATION

LINEAR VOICE DATA (RECEIVER)

LINEAR VOICE DAT A (SEND)

Figure 4-10: Block Diagram of A CODEC Unit

NECA 340-414-100 Revision 2.0 Page 41

General Description Manual MCU 5000A Mu ltipoint Control Unit

G: A SUM Unit General

4.21

This unit provides the audio sum function for maximum 8 channels per unit.

Function

(1) Audio Sum Dis tributing

The decoding PCM signal from the audio codec part (A CODEC unit) is

added with maximum 8 channels. The decoding PCM signal which is

processed with the sum is sent to the audio codec part (A CODEC unit).

The number of the summing channels is instructed from the control

processing part (M CONT unit).

(2) Load Control

The load value of each channel is determined with the comparison of the

audio signal and the audio level (maximum 8 channels per two

teleconferences). The processed signal is sent to the audio codec part (A

CODEC unit).

(3) Talker Identifying

The main talker is verified with the comparison for the talker and non-

talker signal from the audio codec part (A CODEC unit). The talker

change is notified to the control part (M CONT unit). The main talker

forced switching request does not affect the method. The identifying

method is as follows:

• When the talker is single, talker channel number is identified.

• When the talker is multiple, the channel number with the most of the past continuous talker frame is identified.

• When no talker, the channel number of the former talker is identified.

• The initial value of channel number is “1”.

(4) Message Tone Insertion

The message tone (1200 Hz -10 dBm0 or + 1225 Hz -10 dBm0) is added to PCM signal, and distribute to all of the teleconference channels.

(5) Monitor Output

The summing PCM signal (one of teleconference A or B) is converted to analog signal and output to the front connector on the unit. (600 Ω unbalanced). This function is used for test purpose.

Note:

This unit contains independent two systems for the functions above. These functions i s a vai lable to the individual two tel econfe rences . Fig. 4-

11 and 4-12 show the block diagram of A SUM unit and voice signal

process unit respectively.

Page 42 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

TO A CODEC

VOICE/NON-VOICE CH 1

VOICE/NON-VOICE CH 8

LOADING VALUE CH 1

LOADING VALUE CH 8

TALKER/NON-TALKER CH 1

TO M CONT

CASADE CONNECTION CH SPECIFICATION

LOAD

CONTROLLER

FORCED SPECIFICATION

CH NO.

TALKER

IDENTIFIER

T ALKER/NON-TALKER CH 8

CH 1 PCM

CH 2 PCM

CH 3 PCM

CH 4 PCM

CH 5 PCM

CH 6 PCM

CH 7 PCM

CH 8 PCM

OUT

MESSAGE TONE

OSCILLATOR

D/A

FROM CONF B

Figure 4-11: Block Diagram of Voice Signal Process 1

MAIN TALKER CHANNEL

M TONE

MONITOR OUT

NECA 340-414-100 Revision 2.0 Page 43

General Description Manual MCU 5000A Multipoint Control Unit

(MDRn) CODED VOICE SIGNAL INPUT

(MDRn) CODED VOICE SIGNAL OUTPUT

DEC

DOC

A CODEC #1

(E32-441-Y1438-0A00)

CH 1

CH 2

CH 3

CH 4

MUX DEM

VOICE/NON-VOICE TALKING/NON-TALKING (APD)

A.T.T. VALUE (AAD) DECODED VOICE OUTPUT (LDR)

−

SUM VOICE SIGNAL INPUT ( LSD)

TALK DECISION

LOAD CONTROL

TELECONFERENCE A MAIN TALKER CH

TELECONFERENCE A CH EXCEPT TALKER CH

A CODEC #2

(E32-441-Y1438-0A00)

CH 5

CH 6

CH 7

CH 8

TALK DECISION

LOAD CONTROL

MUX DEM

Figure 4-12: Block Diagram of Voice Signal Process 2

TELECONFERENCE B MAIN TALKER CH

TELECONFERENCE B CH EXCEPT TALKER CH

Page 44 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

H: PG/SIO Unit General

4.22

This unit generates the clock which is locked the phases of the internal clock within MCU 5000A and external clock extracted from the line by LIF unit. The four RS-232C interface ports are provided. Fig. 4-13 shows the Block Diagram of PG/SIO unit.

Functions

(1) Clock Phase Locking (PLO: Phase Locked Oscillator)

Each internal clock phase (1.544 MHz, 4.096 MHz, or 10.752 MHz)

generated in this unit is locked for the external clock from the line in LIF

unit. The locked clock signal is sent to the other units. (Internal clock

duty is 50%.) When the loss of ext ernal clock or int ernal clock ph ase sli p

etc. occur, this unit requests the troubleclearing to the master CPU in M

CONT unit. The system clock is generated with 4.0966 MHz above, and

sent it to the other units.

(2) Console Communication

Four RS-232C interfaces a re pro vided for M CONT unit I/O interfac e fo r

console communication. The communication condition for the RS-232C

interface is determined in accordance with the parameters in the serial

controller (MB89371A) of this unit set by master CPU on the M CONT

unit. Table 4-9 shows the parameter for RS-232C interface.

(3) Interrupting Control

The interruption (RS-232C sending/receiving interruption) in this unit

and the interruptio n (main talker change) i n the A SUM unit a re collecte d

to the interrupting controller, and the interruption is performed to the M

CONT unit.

Table 4-9: RS-232C Parameter

P ARAMETER FUNCTION

Synchronization mode Start-stop Sy nchronization Mode Baud Rate 1200/2400/4800/9600 bps Character Bit Length 8 bit Stop Bit Length 1 bit Parity Check Null Loopback Funct ion from SD to RD Loopback in IC inside

NECA 340-414-100 Revision 2.0 Page 45

General Description Manual MCU 5000A Multipoint Control Unit

PG/SIO

CPU BUS

M CONT UNIT

CPU INF

SERIAL

CONTROLLER

RS-232C CH4

CH8

CH7 CH6 CH5

CH4 CH3 CH2 CH1

LINE

1.5M LIF UNIT

CLK LOSS

DETECTOR

OSCILLATOR

SEL

1.544 MHz

PLO CIRCUIT

4.096 MHz

PLO CIRCUIT

CLK LOSS

SLIP1

SLIP2

SERIAL

CONTROLLER

INTERRUPT

CONTROLLER

INTERRUPT

CONTROLLER

RS-232C CH4

INTO

INTERRUPTION REQUEST

1.544 MHz

4.096MHz OCTET FRAME MF

10.752 MHz

PLO CIRCUIT

PLO: PHASE LOCKED OSCILLATOR

SLIP3

Figure 4-13: Block Diagram of PG/SIO Unit

Page 46 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

I: M CONT Unit General

4.23

The M CONT unit consists of V53CPU (UPD70236), 256 kbytes ROM (UPD27C1001×2), 3.6 Mbytes RAM (UPD424400×8), (UPD431000×2),1 Mbytes Memory Card, and Real-time Clock (RTC-62421) etc., and which controls the MCU 5000A. The interruption and serial communication control operation are performed with the V53 ICU or SCU. Fig. 4-14 shows the Block Diagram of M CONT unit.

Functions

(1) MPU : V53 (UPD70236R-8, 8 MHz)

(2) Memory : ROM 256 kbytes (UPD27C1001AD×2)

DRAM 3.5 Mbytes (UPD424400×8) SRAM 128 kbytes (UPD431000×2) Memory Card1 Mbytes

(3) Oscillator : Crystal oscillator (31.9488 MHz)

(4) Real-time Clock : RTC-62421

(5) RS-232C Controller: V53 internal peripheral (UPD71051 sub set)

(Program test usage)

(6) Timer/Counter : V53 internal peripheral (UPD71054 sub set)

(7) Interruption Detector: V53 internal peripheral (UPD71059 sub set)

(8) DMA : V53 internal peripheral (UPD71071 sub set)

NECA 340-414-100 Revision 2.0 Page 47

General Description Manual MCU 5000A Multipoint Control Unit

UPD70236 (V53)

CLOCK IN

ADDRESS

DATA

CONT

INT

OSC 31.9488 MHz

DATA BUS

CONTROL BUS

ADDRESS

DEC

ADDRESS BUS

UPD27C1001AD

ROM X 2 (256 KB)

DRAM X 2

(3.5 MB)

UPD424400

UPD431000

SRAM X 2

(128 KB)

SYS BUS

SCU

REAL TIME

CLOCK

UPD4711A

TTL/

RS-232C

CN3

Figure 4-14: Block Diagram of M CONT Unit

RAM

CARD

Page 48 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

J: VDSW Unit General

4.24

The VDSW unit switches the video signal between RD IN and SD OUT from EC H221 MUX unit. This unit receives the LSD/HSD/MLP demultiplexed from service channel in EC H221 MUX unit, and the proceed LSD/HSD/MLP is sent back to the EC H221 MUX unit.

Functions

(1) V SW

This unit sends the video signal of the transmitting teleconference

terminal received from the EC H221MUX bus (MD-R) to EC H221

MUX bus (MD-S) of the receiving terminal. The video signal of

maximum 8 points can be switched.

(2) MLP IF

Receiving/sending MLP data within the data from service data. The

monitoring function is provided. MLP data with frame format of HDLC

frame is sent/received from HDLC controller (HSCX).

(3) LED

LEDs indicate the teleconf er ence, originating, HSD/LSD data sour ce a nd

operator terminal are pro vided.

(4) PN Pattern Generator/Checker

The test functions for this unit and other unit in the MCU 5000A are

provided.

(5) HSD/LSD IF

This unit sends the HSD/LSD data of the transmitting teleconference

terminal received from the EC H221 MUX unit to EC H221 MUX unit.

Note:

This unit requires H.243 data distribution function.

4.25

Fig. 4-15 shows the block diagram of the VDSW unit.

NECA 340-414-100 Revision 2.0 Page 49

General Description Manual MCU 5000A Multipoint Control Unit

CPU BUS

MLP R

MLP S

LSD R

LSD S

MD R

S/P

SEL

8 8

P/S

HSCX

INF

HSCX

MD S

SEL

HSCX

PN PTN

GEN/CHK

Figure 4-15: Block Diagram of VDSW Unit

Page 50 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

5: SOFTWARE

5.01

used in the MCU 5000A. The RX136 OS conforms to the I TRON specifications.

5.02

per each function, and also each driver task is executed per each hardware. The individual task is independently separated under that OS. Each task operation switching is caused by trigger of the transported messages with priority. The program is stored in the memory card. For software version up for the function upgrade, the new memory card replacement is required only.

A: Task Description 5.03

the MCU 5000A Memory Mapping. The following task functions are available.

Loader (LO)

Timer (TM)

The RX136 operating system of the control real-time/multitask OS is

The multitask operation is established that each control task is executed

Fig. 5-1 shows the task diagram for the MCU 5000A, and Fig. 5-2 shows

• The code data in the memory card is loaded to the equipment memory

• Every task is started up according to the start table file

• Transference of task processing to CM

• Time-out mail issue for task request

Memory Card Driver (MD)

• File read-out/write-in from memory card

• Data read-out/write-in from memory card

• File system management

Conference Management (CM)

• Initialization of every task

• Line exchange setting

• Multipoint connection setting

• Teleconference group management

• Command analyses from CC

• Pass-through of teleconference control indication

• Pass-through of teleconference control command from CC

• Site name management

• Encryption key management

• Loop test management

• Slave console control

NECA 340-414-100 Revision 2.0 Page 51

General Description Manual MCU 5000A Multipoint Control Unit

Console Control (CC)

• Internal formal conversion of console command/indication

• Exclusive control of CD1 to CD3

• Teleconference control indication ON/OFF (each console)

• Execution of command terminated within CC

• Command send/receive in cascade-connection mode

• Slave console control

• Console through-pass control

• Overlay of program file in CPMC

Console Driver (CD1 to CD3)

• RS-232C port input/output [per one line including carriage return (CR)]

Command Generator

• Automatic execution command transference

Real-Time Clock Management (RM)

• Real-time clock setting/read-out

Line Management (LM)

• Line stat e manageme nt

• Line exchange setting management

• Conversion of line setting (disconnection) parameter

AMI Line Control (LCA)

RS-422 Line Control (LCR)

ISDN Line Control (LCI)

FIFO Driver (FH)

• Parameter data transportation to PIIFC

• PIIFC task start-up

• Call contro l

Line Exchange (LX)

• Line Exchange setting (MTSC)

• Line switching management

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MCU 5000A Multipoint Control Unit General Description Manual

Picture Switching (PS)

• Picture Switching of conference room

• HSD switching

Voice Input/Output Control (VC)

• Audible (voice) teleconference group setting

• Voice detection

• Audible alert sendi ng

Multipoint Control (TCA, TCB)

• Teleconference management

• Video signal switching control by voice (talker) signal

• Video signal switching control from terminal request

• Operator management

• Voice detection ON/OFF

• Site name data transpor ting

• BAS command control

• Still picture transporting control

• Cascade-connection control

Electrical Whiteboard Control for MCU

• Distribution of electrical whiteboard data

• Management of electrical whiteboard data sending privilege

• Distribution of camera data

LAP-B Drive (LD1 to LD8)

• Low-speed data sending/receiving

• link connection management

• Error re- sending

• Distribution of MCU control data/electrical board/cascade control data

BAS Driver (BD1 to BD8)

• MUX unit control

• H.221state management

• H.242 control

NECA 340-414-100 Revision 2.0 Page 53

General Description Manual MCU 5000A Multipoint Control Unit

FHn

LCA

LCX

CDn

LCI

BCx

TCx

BDn

LDn

TCx: TCA, TCB BCx: BCA, BCB DCx: CD1~CD3 LDn: LD1~LD8 BDn: BD1~BD8 FHn: FH1~FH14

OS (RX-136)

Figure 5-1: MCU 5000A Task Diagram

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MCU 5000A Multipoint Control Unit General Description Manual

400000H

MEMORY CARD

COPY AREA

300000H

100000H

0C0000H 0B0000H

080000H

060000H

000000H

ROM

MEMORY CARD BANK

SRAM

BANK WINDOW

TASK AREA

BANK 14 BANK 13

BANK 12 BANK 11

BANK 10 BANK 9 BANK 8

BANK 7

BANK 6 BANK 5 BANK 4

BANK 3 BANK 2

BANK 1

NOT USED NOT USED

BCB

BCA

TCB TCA

LCI

LCR

LCA

LM RM CG

2E0000H 2C0000H 2A0000H 280000H

260000H 240000H 220000H

200000H

1E0000H

1C0000H 1A0000H

180000H

160000H 140000H 120000H

128 KBYTE

100000H

Figure 5-2: MCU 5000A Memory Mapping

NECA 340-414-100 Revision 2.0 Page 55

General Description Manual MCU 5000A Multipoint Control Unit

This page is for your notes.

Page 56 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

6: SPECIFICATIONS

A: Physical

Specification

B: Electrical

Specification

6.01

The MCU 5000A is installed in the 19-inch subrack. Fig. 6-1 shows the outline of the MCU 5000A. Th e rear view of MCU 50 00A is sh own in Fig. 6-2. The installing units layout in the subrack is illustrated in Fig. 6-3. The MCU 5000A unit component is listed in Table 2-1 in paragraph 2.01.

6.02

The electrical specifications of MCU 5000A are shown in Table 6-1.

TOP VIEW

19 in (48.26 cm)

MCU

MULTIPOINT CONTROL UNIT

NEC

FRONT VIEW

REAR VIEW

15.7 in (39.88 cm)

14 in (35.56 cm)

SIDE VIEW

Figure 6-1: MCU 5000A Outline

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General Description Manual MCU 5000A Multipoint Control Unit

RS-232C

CH1

CH2

CH3

CH4

+ +

HSD IF LIF

CH5

CH6

CH7

CH8

CH1

CH3

CH4

CH13

CH14

CH15

CH16

CH9

CH10

CH11

CH12

CH5

CH6

CH7

CH8

CH1

CH2

CH3

CH4

* RC-232C CONNECTOR

AC P OWER

EARTH

TERMINAL

HSD IF

CONNECTOR

LIF

CONNECTOR

NAME PLATE

LIST OF CONNECTORS

CONNECTOR NAME CONNECTOR PIN QUANITY

LIF CH1 - CH16 15 pins HSD IF CH1 - CH8 15 pins RS-232C CH1 - CH4 25 pins

* :

THE CH4 AT RS-232C PORT IS FOR FACTORY USE.

Figure 6-2: Detailed Rear View of MCU 5000A

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MCU 5000A Multipoint Control Unit General Description Manual

1U = 1.75'' (4.45 cm)

(U)

I F # 3

F #

CABLE SPACE

E C

2 1

M U X

# 8

P G

PWR

02468101214161820

Figure 6-3: MCU 5000A Unit Installation Layout

24 26 28

(B)

1B = 0.59''

NECA 340-414-100 Revision 2.0 Page 59

General Description Manual MCU 5000A Multipoint Control Unit

Table 6-1: MCU 5000A Electrical Specification

UNIT ITEM DESCRIPTION

Connected Terminal and Line

Teleconference control

Other

Condition

Terminal

Accommodating Transmission rate Same line rate terminal.

Line Rate

Audio Signal Control Option Selection

Visual Switching Control Option

Line Exchange Control

Loopback Test Local/Remote Independent Loopback Control. T es t Tone Generation/Output of System test ton e .

Video Switching Time

Input Voltage AC 117V, DC -48V Power Consump tio n approx. 150 VA. Environment Condition Temperature: 32° to 104° F (0 to 40° C) Humidity: 45 to 85%

Dimension

Weight approx. 77.16 pounds (28.78 kilograms)

Teleconference: CODEC:

AMI (B8ZS)

RS-422

ISDN (H0) 64/2x64/384 /2x384 kbps.

Automatic Switching

Teleconference Transmitting Control (option)

Operator Control (option)

Receiving Select Control (option)

Point-to-Point Sets the terminals on p oint-to -po in t in b idire ct ion al.

One Way

One W a y Monito r

Multipoint Multipoint teleconference is provided. T el e-ed uca tio n Tele-educa tio n syste m is establish e d.

Average time from teleconference request to requested video signal output: about 3 seconds (VisuaLink 5000 and line rate 384 kbps case.)

19 in (W) × 15.7 in (D) × 14 in (H)

48.26 cm (W) x 39. 88 cm (D) x 35.56 cm (H)

VisuaLink AD series VisuaLink 5000

64/2x64/128/ 192/256/384/2x3 84/512/768/1152/ 1472/1536 kbps.

56/56×2/64/ 64×2/128/192/256/384/2x384/512/ 768/1152/1536/1920 kbps.

µ-Law PCM (ITU-TS G.711 3.4 kHz) SB-ADPCM (ITU-TS G.722 7 kHz)

Performs the compar ison of audio level of each teleconference terminal, and the identification of talker. (Talker’s terminal displays the image of primary talker.)

Broadcasts the video signal of the required teleconference terminal to all of the remote terminal.

Operator terminal, which has been preliminaril y get, determined and switches the broadcasting video signal.

Each teleconference terminal determines and receives the individual termi nal image.

The terminals are connected in unidirectional. Broadcasting to the plural terminal specified is available.

Sends the video signal of a terminal to the plural terminals specified. The sending termin al monitors the video image of the specified terminal in video receive mode.

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MCU 5000A Multipoint Control Unit General Description Manual

7: SYSTEM CONTROL AND VARIOUS APPLICATIONS

A: Line Switching

Control

LINE 1

LINE 2

LIF

CH1

LIF

CH2

7.01

The outline of line switching control which is carried out within MCU

5000A inside is explained in the following paragraphs.

Data Highway

7.02

The block diagram of basic signal flow for video and audio signals is shown in Fig. 7-1. The transmission rate of incoming line data is converted into the rate of internal data highway (2Mbps) in LIF unit and the data is transmitted to each unit. The internal data highway is composed of LB bus applied to point-topoint connection, LD bus (S and R) applied to multipoint connection, MD bus (S and R), and LSD (S and R).

(1)

(2) (3) (4) (5) (6)

EC H221 MUX

CH1

EC H221 MUX

CH2

A CODEC

CH1

A CODEC

CH2

A SUM

LINE 8

LIF

CH8

Note: (1) LB bus (0 - 7) (4) LSD (S, R)

(2) LD bus R (0 - 7) (5) MD bus R (0 - 7) (3) LD bus S (0 - 7) (6) MD bus S (0 - 7)

EC H221 MUX

CH8

Figure 7-1: Block Diagram of Basic Signal Flow

A CODEC

CH8

V SW/

LSD

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General Description Manual MCU 5000A Multipoint Control Unit

Multipoint Connection

7.03

Multipoint teleconfere nce is con trolled wit h the Conf erenc e Management (CM) and multipoint Teleconference Control (TC) tasks. The conference is controlled with two Teleconference Control (TCA/TCB) tasks individually, therefore multipoint teleconferences of two groups can be held at the same time.

7.04

When Conference Management (CM) task receives request message for multipoint connection from Console Control (CC) task, it activates the relating tasks to lines (L M, LC, LX) first, and makes multipoint line conne ction with the specified line rate. After that, it transfers the request message for multipoint connection to multipoint Teleconference Control (TCA/TCB) task and transfers the control to the task. Multipoint Teleconference Co ntrol (TCA/T CB) task transfers the rec eived request messa ge for multipoi nt connection t o Picture Switch (PS) task and Voice Control (VC) task. At t he same ti me Pictur e Switch ( PS) task and Voice Control (VC) task is controlled to broadcast the picture and voice of the terminal which receives the information message of CODEC alignment recovery from BAS Driver (BD) task.

7.05

When these tasks, multipoint teleconference control task determines the transmission rate and voice coding mode to exchange the capacity with CODEC via BAS Driver (BD) task. Teleconference operating status is transferred to the teleconference t erminals when r eceivin g the request message for con necting t o the teleconference t ermina l fro m LAP-B dr iver. The following controls of mu lt ipoin t teleconference with four terminals (ex ample) are pro vided.

Voice Signal

7.06

Among the line data of four terminals, the voice signal is received on A CODEC unit via LIF unit and EC H221 MUX unit. A CODEC unit decodes the coded voice signal and sends it to A SUM unit. A SUM unit sums voice signal received from each termin al, and sends it back to each terminal. At that time, the mixed voice signal (summed up voice signal of the terminals from the second to the fourth) except the voice signal of the originating terminal (the first terminal) is sent back to the originating terminal.

7.07

Namely, each terminal receives th e sum-processed voice signal of all terminals by MCU 5000A except its own voice signal. The voice signal level except that of picture broadcasting terminal is limited to lower level than that of broadcasting terminal. The signal flow of voice signals are as shown in Fig. 7-2.

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MCU 5000A Multipoint Control Unit General Description Manual

LB LDR LDS LSD MDR MDS

LINE 1

LINE 2

LINE 3

LINE 4

LIF

CH1

LIF

CH2

LIF

CH3

LIF

CH4

CH 1 TRANSMIT SIGNAL CH 1 RECEIVE SIGNAL (PICTURE OF CH 2, 3, 4)

CH 2 TRANSMIT SIGNAL

CH 2 RECEIVE SIGNAL (PICTURE OF CH 1, 3, 4)

EC H221 MUX

CH1

EC H221 MUX

CH2

EC H221 MUX

CH3

EC H221 MUX

CH4

Figure 7-2: Signal Flow of Voice Signals

Picture Signal

7.08 Among the line data of 4 terminals, the picture signal is received on V SW/LSD IF unit via LIF unit and EC H221 MUX unit. V SW/LSD IF unit distributes the coded video signal of the broadcasting terminal to the other terminals by the cont rol of CPU. Th e signal f low of vid eo signals are as shown i n Fig. 7-3.

A CODEC

CH1

A CODEC

CH2

A CODEC

CH3

A CODEC

CH4

CH 1 TRANSMIT SIGNAL

CH 3 RECEIVE SIGNAL (PICTURE OF CH 1, 2, 4)

CH 4 TRANSMIT SIGNAL

CH 4 RECEIVE SIGNAL (PICTURE OF CH 1, 2, 4)

A SUM

LINE 1

LINE 2

LINE 3

LINE 4

LB LDR LDS LSD MDR MDS

LIF

CH1

LIF

CH2

LIF

CH3

LIF

CH4

CH 1 TRANSMIT SIGNAL CH 1 RECEIVE SIGNAL (PICTURE OF CH 2) CH 2 TRANSMIT SIGNAL

CH 2 RECEIVE SIGNAL (PICTURE OF CH 1)

EC H221 MUX

CH1

EC H221 MUX

CH2

EC H221 MUX

CH3

EC H221 MUX

CH4

Figure 7-3: Signal Flow of Picture Signals

V SW/LSD

CH 1 TRANSMIT SIGNAL CH 3 RECEIVE SIGNAL (PICTURE OF CH 1)

CH 4 TRANSMIT SIGNAL CH 4 RECEIVE SIGNAL (PICTURE OF CH 1)

NECA 340-414-100 Revision 2.0 Page 63

General Description Manual MCU 5000A Multipoint Control Unit

Low-speed Data

LINE 1

LINE 2

LINE 3

LINE 4

7.09

The control d ata for the multip oint teleconf erence is trans mitted/rece ived to/from the terminals through the LSD bus, the EC H221 MUX unit, and the LIF unit under control of the CPU. The electrical whiteboard data received from the LDS bus is distributed again to the LSD buses. Fig. 7-4 shows an example of th e distribution of the electrical whiteboard data is received by the CPU and then transmitte d from the CPU.

LB LDR LDS LSD MDR MDS

LIF

CH1

LIF

CH2

LIF

CH3

LIF

CH4

CH 1 TRANSMIT SIGNAL CH 1 RECEIVE SIGNAL CH 2 TRANSMIT SIGNAL

CH 2 RECEIVE SIGNAL (DATA OF CH 1)

EC H221 MUX

CH1

CH2

CH3

CH4

M CONT

V SW/LSD

CH 1 TRANSMIT SIGNAL

CH 3 RECEIVE SIGNAL (DATA OF CH 1)

CH 4 TRANSMIT SIGNAL

CH 4 RECEIVE SIGNAL (DATA OF CH 1)

Figure 7-4: Low-speed Data Flow

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MCU 5000A Multipoint Control Unit General Description Manual

Point-to-Point Connection

LINE 1

LINE 2

LINE 3

LIF

CH1

LIF

CH2

LIF

CH3

7.10

Different from multipoint connection, point-to-point connection sets up face-to-face video -teleconferen ce. This connect ion is control led with Conferen ce Management (CM) task. When Conference Management (CM) task receives request-to-connect from Console Control (CC) task, it activates the relating tasks to lines (LM, LC, LX) and exchanges lines with the specified bit rate. In this case, the two conference terminals are connected with both ways.

7.11

When two points are connecte d, LIF unit out puts line data to the specified channel of LB bus with CPU control. Line data is output to the line from LIF unit of the specified channel through LB bus. Both two points receive the picture and the voice each other. Fig 7-5 shows examples of point-to-point connections of two groups.

LB LDR LDS LSD MDR MDS

EC H221 MUX

CH1

EC H221 MUX

CH2

V SW/LSD

EC H221 MUX

CH3

LINE 4

LIF

CH4

CH 1 TRANSMIT SIGNAL CH 1 RECEIVE SIGNAL (DATA OF CH 2) CH 2 TRANSMIT SIGNAL

CH 2 RECEIVE SIGNAL (DATA OF CH 1)

Figure 7-5: Data Flow on Point-to-Point Connection

EC H221 MUX

CH4

CH 1 TRANSMIT SIGNAL CH 3 RECEIVE SIGNAL (DATA OF CH 4)

CH 4 TRANSMIT SIGNAL CH 4 RECEIVE SIGNAL (DATA OF CH 3)

NECA 340-414-100 Revision 2.0 Page 65

General Description Manual MCU 5000A Multipoint Control Unit

Broadcast Connection

LINE 1

LINE 2

LINE 3

LINE 4

7.12

Different from Multipoint connection, Broadcast connection provides a video teleconference which is similar to television transmission, namely a broadcasting TV station. In this case, the line data of the specified terminal is transmitted and distributed to all the other terminals through LB bus. Fig 7-6 shows an example of broadcast connection, point 3 as broadcasting terminal.

LB LDR LDS LSD MDR MDS

LIF

CH1

LIF

CH2

LIF

CH3

LIF

CH4

CH 1 TRANSMIT SIGNAL CH 1 RECEIVE SIGNAL (DATA OF CH 3) CH 2 TRANSMIT SIGNAL

CH 2 RECEIVE SIGNAL (DATA OF CH 3)

EC H221 MUX

CH1

EC H221 MUX

CH2

V SW/LSD

EC H221 MUX

CH3

EC H221 MUX

CH4

CH 1 TRANSMIT SIGNAL

CH 3 RECEIVE SIGNAL (DATA OF CH 4)

CH 4 TRANSMIT SIGNAL

CH 4 RECEIVE SIGNAL (DATA OF CH 3)

Figure 7-6: Data Flow on Broadcast Connection

Page 66 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

B: Picture Switching

Control

7.13

Switching Control of Picture display includes two modes, one is

automatic switching and the other is manual switching.

Automatic Switching Mode

7.14

The role of this mode is to recognize a terminal as a talker when voice level of the terminal exceeds a definite value, and to broadcast the picture of the terminal to each conference room automatically.

7.15

When the Voice Control (VC) task recognizes a talker by the interruption caused by A SUM unit, talker detection message is transferred to a multipoint Teleconference Control (TCA/TCB) task.

7.16

When the multipoint Teleconference Control (TCA/TC B) task recei ves the talker detection message, it sends necessary message to each related task in order to broadcast th e pi ct ure of the conference r oom where a talker is det ec ted t o all the participating conference rooms.

7.17

First, in order to still the picture on screen momentarily, the teleconference cont rol t ask sends a picture freeze c omma nd f rom EC H22 1 MUX unit to picture codec of the terminals via BAS Driver (BD) task, and then Picture Switch (PS) task switches picture broadcasting terminal with c ontrolling V SW/ LSD unit. Successively, Picture Switch (PS) task sends picture refresh command to the broadcasting terminal via BD task. Voice control task mixes the voice signals of all the participant terminals, however the voice signal of broadcasting terminal is th e highest level.

Manual Switching Mode

7.18

The role of this mode is to switch a picture on screen with the command sent from a MCU console of each conference room. Picture switching request message from the terminals of each conference room is transferred to multipoint teleconference control task through V SW/LSD unit and via LAP-B Driver (LD) task.

7.19

When a picture switching command is entered from a console, it is converted to picture switching request message with console control (CC) task and moreover it is transferred to multipoint Teleconference Control (TCA/TCB) task via Conference Management (CM) task.

7.20

According to those messages, multipoint Teleconference Control (TCA/ TCB) task controls picture switching similar to automatic switching mode, so as to broadcast the picture of the specified conference room.

NECA 340-414-100 Revision 2.0 Page 67

General Description Manual MCU 5000A Multipoint Control Unit

C: Voice Detection

Control

7.21

Voice Detection Control is carried out wi th the occurrence of i n t err upt ing Voice Control (VC) task when a talker is detected on A CODEC unit. This control is available to broadcast the picture of a primary talker on the above mentioned automatic switching mode.

Page 68 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

D: Teleconference

Terminal Interface

7.22

The control command is multiplexed in the picture data (called MLP) and transmitted from each conference terminal. At a receive terminal, this control command is extracted from the picture dat a and taken into the LAP-B Drive r (LD) task, where it is analyzed. Analyzed control command is transferred to the electrical Whiteboard Control (BCA/B) task or the multipoint Teleconference Control (TCA/B) task to processing the each task.

7.23

When the teleconference condition has changed, such as the number of participating rooms and broadcasting location, the current teleconference condition is informed by t he multipoi nt Teleconference Control (TCA/B) task, vi a the LAP-B Driver (LD) task, to all the part icipating term inals. This informati on is superimposed on the monitor display in the respectiv e rooms.

NECA 340-414-100 Revision 2.0 Page 69

General Description Manual MCU 5000A Multipoint Control Unit

Command Details

7.24

Ta ble 7-1 shows the detail command/response in this interface.

Table 7-1: Detail Command/Response (1 of 3)

TYPE DESCRIPTION COMMAND DIRECTION FUNCTION

Multipoint control

Operator privilege request

Operator privilege indication OPI Terminal ← MCU

Broadcasting request SPR Terminal → MCU

Broadcasting indicates

Authorized picture receive request

Authorized picture receive indicate

Talker detect control request VCR Terminal → MCU

Talker detect control indicate VCI Terminal ← MCU

Still picture transmission request

Still picture transmission permission

Still picture transmission complete

Teleconference terminal connection request

Teleconference terminal connection indicates

OPR Terminal → MCU

SPI Termi nal ← MCU

RPR Terminal → MCU

RPI Terminal ← MCU

SSR Terminal → MCU

SSC Terminal ← MCU

SSE Terminal → MCU

JNR Terminal → MCU

JNI Terminal ← MCU

Provide operator privilege to request terminal.

Operator privilege indication is sent to every entry terminal by br oadcasting style.

A terminal is allowed to broadcast the picture to all the terminals participa ting in the teleconference, when it has requested so.

The notice of broadcasting term inal is send to all the terminals, participating in the teleconference.

A terminal is allowed to receive the picture of a specific terminal, when it has requested so.

The notice of receiving of the specific picture is broadcasted to all the terminals participating in the teleconference.

A terminal is allowed to turn ON/OFF its talker detection function, whe n it has requested so.

The notice of talker detection control is broadcasted to all the terminals participating in the teleconference.

A terminal is allowed to broadcast its stationary picture to all the terminals participating in the teleconference, when it has requested so.

The notice of permission of transmitting the stationary picture is sent to only the requesting terminal.

After the MCU has received the completion notice of transmitting the stationary picture, it restores the previous teleconference conditions.

A terminal is allowed to participate the designated group of the multipoint teleconference, when it has requested so.

The notice of the teleconference terminal connections broadcasted to all the terminals participating in the teleconference.

Page 70 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

Table 7-1: Detail Command/Response (2 of 3)

TYPE DESCRIPTION COMMAND DIRECTION FUNCTION

A terminal is allowed to receive the current condition of the desi gn at ed teleconference group.

The notice of receiving information on the designated teleconference condition is sent to only the requesting terminal.

In the Tele-education mode, a receiving terminal requests a transmitting terminal to speak. The receiving terminal can send a message with the speaking request.

The notice of speaking request is broadcasted to all the terminals participating in the teleconference.

In the T ele-e ducat ion con nection mode, a receiving terminal requests a tra nsmitting terminal to cancel the speaking request.The receiving terminal can send a message with the speaking request cancel.

The notice of the speaking request cancel is broadcasted to all the terminals participating in the teleconference.

A terminal is allowed/inhibited to speak and turns ON/OFF the voice signal input.

The notice of speaking permission is broadcasted to all the terminal participating in the teleconference.

The broadcasting terminal is allowed to monitor a room other than currently monitored one.

The notice of object monitoring change is broadcasted to all the terminal participating.

A terminal is allowed to expel from the designated group of the teleconference, when it has requested so. The notice of the current teleconference connection is sent to all the terminals participating in the teleconference.

Multipoint control

Status read of teleconference terminal request

Status read of teleconference terminal response

Asking request EQR Terminal → MCU

Asking request indicates EQI Terminal ← MCU

Asking request cancel ERC Terminal → MCU

Asking request cancel indicates

T al king pe rm ission ETK Terminal → MCU

Talking permission indicates ETI Terminal ← MCU

Switching moni tor pic ture request

Switching moni tor pic ture indicates

Status of teleconference terminal indicates

SRR Terminal → MCU

SRC Terminal ← MCU

ECI Terminal ← MCU

MPR T erminal → MCU

MPI Terminal ← MCU

STI Terminal ← MCU

NECA 340-414-100 Revision 2.0 Page 71

General Description Manual MCU 5000A Multipoint Control Unit

Table 7-1: Detail Command/Response (3 of 3)

TYPE DESCRIPTION COMMAND DIRECTION FUNCTION

The MCU sends the terminal locations

Multipoint control

Electrical whiteboard

Remote station control

Read site name indicates PDI Terminal → MCU

Message indicates MSD Terminal → MCU

Electrical whiteboard data receive

Electrical whiteboard data transmission

Move camera request

Camera status indicates CAMI Terminal ← MCU ← T erminal

Remote station data receive

Remote station data transmission

Talker name indicates CPNI Terminal ← MCU ← Terminal

BRCV Terminal → MCU

BSND Terminal ← MCU

CAMS

RRCV

RSND Terminal ← MCU ← Terminal

Terminal → MCU → Termina l

Terminal → MCU → T erminal

names to each terminals participating in the teleconference.

The MCU requests each terminal participating in the teleconference to display the message.

A terminal transmits and receives the electrical whiteboard data.

A local terminal requests the movement of camera in the conference room of remote station.

The notice of th e ca mera state is se nt t o only the requesting terminal.

A terminal is allowed to transmit and receive the message from the designated terminal.

The name of a speaker, who is going to speak in the conference room where the camera is pre-set, is sent to all the terminals participating in the teleconference.

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MCU 5000A Multipoint Control Unit General Description Manual

Interface Format

7.25

Fig. 7-7 shows the format of this interface. Format of line are HDLC frame format.

COMMAND RESPONSE

COMMAND CLASSIFICATION

COMMAND/RESPONSE CLASSIFICAT ION: 01H = FOR MULTIPOINT CONTROL

COMMAND CODE

PARAMETER

(MAX. 254 BYTE)

02H = FOR CASCADE COMMUNICATION 03H = SLAVE CONSOLE CONTRO L 10H = FOR CONTROL CAMERA OF REMOTE TERMINAL 14H = FOR ELECTRICAL WHITEBOARD DATA OTHER = RESERVED

Figure 7-7: Command/Response Format

RESPONSE CLASSIFICATION

RESPONSE CODE

PARAMETER

(MAX. 254 BYTE)

1 BYTE

NECA 340-414-100 Revision 2.0 Page 73

General Description Manual MCU 5000A Multipoint Control Unit

Sequence Example

SWITCHING

MCU

7.26

COMMUNICATION TO TELECONFERENCE TERMINAL (TC5000)

COMMUNICATION TO CODEC (VL5000)

TERMINAL1

SPR (01)

[FPR]

[FUR]

SPI (02)

Fig. 7-8 shows the sequence example. (Request from terminal 1.)

SPI

INDICATIO N

(a) Broadcasting Request (Except Operator)

MCU

TERMINAL1

SPR (02)

[FPR]

[FUR]

TERMINAL2

SPI INDICATION

TERMINAL2

TERMINAL3

DEPRESS [LOCAL SEND] KEY ON REMOTE CONTROLLER

PICTURE OF CONFERENCE ROOM EXCEPT ORIGINAL REQUESTING TERMINAL IS FREEZED.

PICTURE OF ORIGINATING CONFERENCE ROOM IS SET T O DIST RIBUT E ALL ROO MS

THE ORIGINATING TERMINAL IS NO T IFIED TO OTHER ROOMS.

SPI INDICA TION

TERMINAL3

DEPRESS [2] KEY ON REMOTE CONTROLLER

PICTURE OF CONFERENCE ROOM EXCEPT ORIGINAL REQUESTING TERMINAL IS FREEZED.

PICTURE OF ORIGINATING CONFERENCE ROOM IS SET TO DISTRIBUTE ALL ROOMS

MCU

SPI (02)

OPR (01)

OPI (01)

SPI

INDICATIO N

SPI INDICATIO N

THE ORIGINATING TERMINAL IS NOTIFIED TO OTHER ROOMS.

SPI INDICA TION

(b) Broadcasting Request (Operator)

INDICATION

TERMINAL2

OPI INDICATION

TERMINAL3

DEPRESS [OPR] KEY ON REMOTE CONTROLLER

NOTIFY CHAIRMAN TO ROOM

OPI INDICATION

TERMINAL1

OPI

Figure 7-8: Sequence Example (1 of 4)

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MCU 5000A Multipoint Control Unit General Description Manual

SWITCHING

MCU

RPR (03/01)

[FPR]

[FUR]

RPI (03/01)

RPI (0)

VCR (01)

VCI (01)

INDICATION

TERMINAL2

RPI INDICATION

TERMINAL3

DEPRESS [SLCT RCV] KEY ON REMOTE CONTROLLER

PICTURE OF CONFERENCE ROOM EXCEPT ORIGINAL REQUESTING TERMINAL IS FREEZED.

PICTURE OF ORIGINATING CONFERENCE ROOM IS SWITCHED IN ALL DATA MODE.

RESPONSE TO ORIGINAL REQUESTING TERMINAL IS NOTIFIED

RPI INDICATION

TERMINAL1

RPI

(d) Authorized Picture Receive Request (Authorized Picture is Terminal3)

INDICATION

TERMINAL2

VCI INDICATIO N

TERMINAL3

DEPRESS [VOICE ACTIVATE] KEY ON REMOTE CONTROLLER

NOTIFY TERMINALS

VCI INDICATION

TERMINAL1

VCI

(e) Talker Detect Control Request

MCU

SSR (01)

[FPR]

[FUR]

SSE (01)

SRR (01)

SRC (01)

TERMINAL1

TERMINAL2

TERMINAL3

DEPRESS [STILL SEND] KEY ON REMOTE CONTROLLER

STILL PICTURE SENDING NOTIFICATION IS RETURNED TO ORIGINAL REQUESTING TERMINAL

STILL PICTURE IS SENT TO ALL OF TERMINALS

SENT STILL PICTURE COMPLETION IS NOTIFIED TO MCU 5000A

(f) Still Picture Send Request

TERMINAL1

TERMINAL2

TERMINAL3

QUERY OPERATION STATE TO MCU 5000A

VERIFIED NOTIFICATION IS RETURNED TO ORIGINAL REQUESTING TERMINAL

(g) Status Read of teleconference Terminal Request

Figure 7-8: Sequence Example (2 of 4)

NECA 340-414-100 Revision 2.0 Page 75

General Description Manual MCU 5000A Multipoint Control Unit

CONSOLE (PC) MCU INSTRUCTOR CLASSROOM1 CLASSROOM2

INDICA TI ON

EQI

ECI

ETI

EQI

EQR

EQI

EQR

EQI

ERC

ECI

ETK

ETI

EQI

ECI

[TK ALW]

ETI

[TALKER RQT]

EQI

[TALKER RQT]

EQI

[TALKER CANCEL]

ECI

ETI

INDICATIO N

[ ] : KEY ON THE MCU CONTROLLER

MPI

SPI

ETI

MPR

MPI

SPR

SPI

ETK

ETI

[SITE SELECTION]

MPI

[INS/TK]

SPI

[START]

ETI

(h) Tele-education Mode (1 of 2)

Figure 7-8: Sequence Example (3 of 4)

MPI

SPI

ETI

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MCU 5000A Multipoint Control Unit General Description Manual

CONSOLE (PC) MCU SPEAKER LISTENER1 LISTENER2

INDICATION

ETK

EQI

ECI

ERC

ETI

ECI

(h) Tele-education Mode (2 of 2)

CONSOLE (PC) MCU (MASTER) TERMINAL M1 MSU SLAVE TERMINAL S1

[TK ALW] [TK CNL]

[TALKER CANCEL]

ETI

ECI

ETI

ECI

REQUEST

RLCS (M1)

RLCS (S1)

RLCI (M1)

RLCI (S1)

E: Loopback Test 7.27

failure has occurred in the MCU 5000A. Some of the loopback tests are carried out from the MCU console by inputting commands, and others are conducted by the switches mounted on the units.

7.28

loop a signal (interna l or external ) back on remot e or local sid e. The MCU 5000A can also generate pseudo noise pattern and carry out self-diagnostic test by checking the returned noise pattern.

RLI (S1)

REMOTE LO OP REQUEST

RLI (S1)

REMOTE LOOP REQUEST

(i) Remote Loop Setting

Figure 7-8: Sequence Example (4 of 4)

Loopback tests are conducted to sectionalize the faulty units when a

The MCU 5000A has loopback points in each unit. The MCU 5000A can

NECA 340-414-100 Revision 2.0 Page 77

General Description Manual MCU 5000A Multipoint Control Unit

F: MCU 5000A

Loopback

7.29

The MCU loopback has two functions; one is to generate the test signal and check the signal looped back inside of the equipment (Local Loopback) is called the local side loop hereafter, the other is to loopback the external signal outside of the equipment (Remote Loopback) is called remote side loopback hereafter. The local side and remote side loops are set at points A to H as shown in Fig. 7-9. Moreover, following functions to generate the test signal and check the looped back signal (loopback test) are available:

• Video signal loopback test

• Audio signal loopback test

• LSD loopback test

• Console loopback test

7.30 Video signal loop test:

The video signal loop test is carr ie d out usi ng the PN pattern generator/che cke r in th e V SW/LSD IP unit. The PN patte rn from the PN pattern generator is l oope d back at the preset loo pbac k point and inputted int o the PN pattern checker, which checks the transmitted pattern with the received one. When a line rate of 1.536 Mbps is selected for the loop test, the MUX strap in the EC H221 MUX unit must be set to OFF position. The MCU software, the Video Switch I/O (PS) task, controls the video signal loop test

7.31 Video signal loop test:

The voice signal loop test is performed by using the test tone generation mode function of the A CODEC unit. The output level (0, -12, -24, -36 dBm0) and frequency (500, 800, 1000 and 1600 Hz) of test tone are selected. The continuous output level of the test tone is measured, while the level of looped-b ack test tone i s checke d. When t he level measureme nt is s elected as the test, the measured leve l value is indicate d on the console displ ay . The MCU software, Voice Control I/O (VC) task, controls the voice signal loop test.

7.32 LSD loop t est (fo ur 00H to 7FH data flames ):

The LSD loop test is done by the HSCX in the V SW/LSD IF unit. The LSD from the HSCX is looped back at the preset loopback point and received by the HSCX. The received LSD is checked with the transmitted LSD. The MCU software, LAP-B Driver (LD) task controls th e LSD loop te st.

7.33 Console loop test:

The console loop test is carried out by the Serial Controller in the PG/SIO unit. The test loop is set automatically. Two loopback points is se lected: one for the Serial Controller, the other for the control signal test, which is located at the outside of RC-232C connector, When the loopback point for control signa l test is speci fied, a loop co nnec tor must be connect ed. The MCU software, Console Dri ver s 1 and 2 (CD1 and CD2) co ntr ol the console loop test.

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MCU 5000A Multipoint Control Unit General Description Manual

1.5M LIF UNIT EC H221 MUX UNIT

RELAY IPAF MTSC

POINT F

V SW/LSD UNIT

POINT A

A CODEC

MTSC

PN CHECKER

PN GENERATOR

MTSC MTSC

POINT DPOINT E

POINT C

POINT H POINT G

POINT B

HSCX

(a) 1.5M LIF Loopback Points

RS-422 LIF UNIT EC H221 MUX UNIT

RELAY MTSC

POINT DPOINT F

MTSC MTSC

POINT C

POINT H POINT G

(b) RS-422 LIF Loopback Points

POINT B

HSCX

POINT A

A CODEC

V SW/LSD UNIT

MTSC

PN CHECKER

PN GENERATOR

Figure 7-9: Loopback Points

NECA 340-414-100 Revision 2.0 Page 79

General Description Manual MCU 5000A Multipoint Control Unit

G: Self Diagnostic

Function

7.44

The loopback point setting, the loopback test and loopback release mentioned above are conducte d by the executi on of the MCU cons ole comma nds. To conduct loopback test, it is necessary to set. However, the console loopback test does not require the loopback point setting because it automatically sets loopback points.

7.45

When power switch is turn- on, the self-diagnostic fo r the followi ng hardware is performed.

• RAM test: Read/write test of RAM area is executed. If any error is detected, the program activity is stopped.

• ROM test: The matching of the check sum and programed value is verified. If any error detected, the program activity is stopped.

• Hardware initializing test: When initializing the har dware with program, the normal initializing operation is verified. If any error is detected, the critical error cause to stop the program activity, the minor error indicates the alarm on the consol e.

• Unit inst allation tes t: Unit installation sta t e is verifie d. When any necessary unit is not installed, the alarm is indicated on the console.

• System parameter back-up test: CRC in the system parameter area is verified. When any error is recognized, and then the program activity is stopped.

Page 80 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

8: MCU CONSOLE

8.01

The MCU console provides the functions of the system parameter and teleconference set ti ng, t he me mo ry c ard cont rol, and the maintenance with MCU console as equipment controller. The MCU console provides operator management/video switch control which is operated by teleconference terminal TC5000 with optional software. Refer to NECA 340-414-300.

A: Console 8.02

The MCU console consists personal computer, which is connectable to the RS-232C serial interface. The MCU console provides various functions by entering console command.

B: Console Command 8.03

Ta ble 8-1 lists all of the console commands provided.

Table 8-1: Console Command List (1 of 4)

COMMAND CATEGORY COMMAND FUNCTION

CGPR Creates auto start command generator program. LCKS Displays synchronization clock source for line. LCNQ Displays type of LIF unit mounted and its bit rat e .

System Setting Monitor

Switching Control

Multipoint/Lecture Connection Control

LECR Resets error counter for physical line. LERQ Displa ys number of error occurren ce on physical line. LSTQ Displays each physical line status. RCGP Retrieves (reads) and displays auto start command ge nerator program. BCON Makes both direction connections between two terminals. BDSC Disconnects both direction connections bet ween two terminals.

Connects one transmit terminal to specified receive terminals and simultaneously

LCON

LDSC Disconnects multiple connections. SDSC Disconnects all connections in the system. RCNN Retrieves and displays connection status on all transmission lines in use. UCON Broadcasts one picture for all specified terminals. UDSC Disconnects broadcast connection. ECON Makes multipoint connections for educa tion mode. EDSC Disconnects multipoint connections for education mo d e. MCNR Sets local terminal to waiting status for cascade connection by master MCU. MCON Makes multipoint connections. MDCR Releases cascade connection status or cascade connection waiting status. MDSC Disconnects multipoint connections. RATT Displays current status of multi-connected terminals in the system.

RRNM

causes transmit terminal to monitor (receive) picture sent from one specified terminal.

Retrieves and displays logic line numbers, logic room numbers, and port numbers for multi-connected terminals.

NECA 340-414-100 Revision 2.0 Page 81

General Description Manual MCU 5000A Multipoint Control Unit

Table 8-1: Console Command List (2 of 4)

COMMAND CATEGORY COMMAND FUNCTION

ALRM Sends or stops alarm tone to all teleconference terminals (rooms).

Assigns or cancels operator privilege of specified teleconference roo m (terminal).

Changes monitor picture on display from broadcasting terminal to the picture from specified terminal.

Cancels request of question/speech from specified lectured terminal to instructor terminal.

Limits talk to one (specified) terminal with in a multipoint teleconference session.

Retrieves and displays ca pabi lity pa ra meter va lu e s of spe c ified m ul ti-c onnec te d terminal.

Indicates relation between con ference room number and terminal number assigned by RCON.

Acquire conference particip ation of termina l for specific con ference room group RCON.

Multipoint Teleconference Control

Multipoint Teleconference Terminal Control

Memory Card Control

H.243 Multipoi nt Connection Control

COPR

CSPR Broadcasts picture of specified terminal. CRPR Connects or disconnects between transmit and receive terminals . CVCR Controls voice (talker) detect function of specified terminal.

CMPR

CSRR Displays status concerning specifi ed terminal. CMSG Displays message into the terminal taking part in multipoint conference. GRRC Sends global indication to all MCU consoles. EQUR Requests question/speech from specified lectured terminal to instructor terminal.

EQRC

ETLK

RCAP

RMOD Retrieves and displays transmit modes of specified terminal. STPR Broadcasts still pictures of specified terminal. SNAM Registers or deletes area name of multi-connected terminal. RNAM Retrieves and displays area na me of multi-connected terminal. CPMC Copies data from source memory card to target memory card. RDIR Retrieves and displays file directory in memory card. RMCS Displays status and type of memor y car d. RMCV Displays software version of memory card. RCON Makes multipoint connections (H.243 mode) RDSC Disconnects multipoint connections. (H.243 mode) RADD Adds multipoint connections to RCON conference. RDRP Drops multipoint connections from RCON conference.

RASN

RRAT

RCNQ Indicate connection situation of multipoint conference, setup by RCON.

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MCU 5000A Multipoint Control Unit General Description Manual

ISDN Control

System Setting and Maintenance

Table 8-1:

NCRN

NDSC Disconnect ISDN line. In case of 2xB, disconnect twice.

NCIC

NIWT Set up to wait for reception to receive wait for ISDN line. NIWQ Indicate the logical line in ready receive st atus line numbers (none a, s, c). NIWR Release recep tio n wait . INET ON/OFF indication report related to ISDN. NSTQ Display transmission status of ISDN line (complete the digit). NLGC Delete communicate history. NPDS Register speed dial.

NPDR

NDSS Register local address.

NDSR

NLGQ

ISPR Initialize system parameter RCLK Read system clock RLCS Remote loop command send RROM Read ROM version RRST Request system reset RSPR Read system parameter RTLP Release loopback test SSPR Set system parameter STLP Set for test of loopback SVSP Save system paramet e r TLOP Test of loopback WCLK Write system clock

Console Command List (3 of 4)

Send a call of ISDN line. In case of 2xB, two lines are connected at one time for the call. In case of 2xB and multipoint (when H.242 on) second call will be processed after the first H.242 negotiation sequence.

When reception report is manual reception received by NINC indication, specify whether to accept this reception.

Display register contents of speed dial (complete the digit. When parameter was omitted, display all registered contents.

Display the registered local numb er (complete th e digit). When omitte d, display all registered lines.

Display the maximum of 100 transmission history (complete the digit). When omitted, indicate all h isto ry. When the specified number exceeds the nu mbe r of accumulate, display all history.

NECA 340-414-100 Revision 2.0 Page 83

General Description Manual MCU 5000A Multipoint Control Unit

Table 8-1: Console Command List (4 of 4)

COMMAND CATEGORY COMMAND FUNCTION

Indicates notifies that telec onference terminal is co nnected to the contro l terminal unit

Global Indication

CJNI

CMPI Indicates notifies that the picture of the broadc asting terminal has been changed COPI Indicates mo difies the assignment or cance llation of the operator privilege CRPI Indicates notifies one transmitting terminal and one receive terminal CSPI Indicates notifies th at a terminal is broadcasting CSTI Indicates notifies th at th e status of a terminal is changed CVCI Indicates notif ies that a terminal is detecting a vo ice EQCI Indicates notifies that the question request EQRI Indicates notifies that a lectured terminal is aski ng ERRI Indicates notif ies that the status ETKI Indicates notifies that the talk the specified terminal is permitted MCNI Indicates notifies that cascade connection is established MDCI Indicates notifies that cascade connection is disconnected RLCI Indicates notif ies that a terminal requests STEI Indicates notifies that the still picture of the terminal is broadcasting

Page 84 NECA 340-414-100 Revision 2.0

MCU 5000A Multipoint Control Unit General Description Manual

9: SYSTEM PARAMETER

A: Application 9.01

The MCU 5000A provides the system parameters in accordance with various operation of the teleconference system. The system can be customized with user requirement condition. Refer to

B: System Parameter 9.02

The main system parameter and the descriptions are shown in Table 9-1.

Table 9-1: System Parameter Setting

NO. SYSTEM PARAMETER FUNCTION

Line rate Sets the connecting line bit rate.

Frame Format Sets the Frame Format used in the connecting line. (T1 only)

Line Code Sets the Line Code used in the connecting line. (T1 only)

RAI type Sets the receiving RAI type. (T1 only)

Clock Source Sets the Clock Source (line/internal)

Line Equalizer Sets the Line Equalizer with port unit. (T1 only)

Video signal switching timer Sets the standard level as the communication rate.

Transfer Rate Capability Sets the transfer rate as the communication rate.

Network Classification Capability Sets the network controlled or no t contro lled

Audio Mode Sets the connected terminal vo ice cap ability.

Network Classification Mode Sets the network controlled or not controlled

NECA 340-414-220

NECA 340-414-100 Revision 2.0 Page 85

General Description Manual MCU 5000A Multipoint Control Unit

This page is for your notes.

Page 86 NECA 340-414-100 Revision 2.0

NECA 340-414-210

ISSUE 2

DOI-G05184

PART OF STOCK # 0293922

MCU 5000A MULTIPOINT

CONTROL UNIT

INSTALLATION MANUAL

SEPTEMBER, 1 998

NEC America, Inc.

LIABILITY DISCLAIMER

NEC America, Inc. reserves the right to change the specifications, functions, or features, at any time, without notice.

NEC America, Inc. has pr ep ared thi s doc um ent for u se by i ts employees and custom ers. The information conta ined herein is the property of NEC America, Inc. and shall not be reproduced without prior written approval from NEC America, Inc.

NEC America, Inc.

Printed in USA

Nec MCU 5000 MCU 5000A - Equipment Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Manual Contents

GENERAL DESCRIPTION MANUAL

Table of Contents

List of Figures

List of Tables

1: GENERAL

2: SYSTEM CONFIGURATION

B: Option Line Growth

3: SYSTEM FEATURES

A: Basic Connection 3.01

H: Line Interface 3.23

4: HARDWARE CONFIGURATION

A: 1.5M LIF Unit General

B: RS-422 LIF Unit General

C: H0-INF Unit General

E: V SW/LSD IF Unit General

F: A CODEC Unit 4.20

H: PG/SIO Unit General

I: M CONT Unit General

5: SOFTWARE

6: SPECIFICATIONS

7: SYSTEM CONTROL AND VARIOUS APPLICATIONS

E: Loopback Test 7.27

8: MCU CONSOLE

9: SYSTEM PARAMETER

INSTALLATION MANUAL