NEC Mcu 5000a Multipoint Control Unit Equipment Manual

							NECA 340-414-100 Revision 2.0Page 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 
						

							Page viNECA 340-414-100 Revision 2.0
List of Tables MCU 5000A Multipoint Control Unit
This page is for your notes. 
						

							NECA 340-414-100 Revision 2.0Page 1
MCU 5000A Multipoint Control Unit General Description Manual
1:  GENERAL
A:  Overview 1.01
The MCU 5000A is a network control equipment which interconnects the 
plural remote teleconference terminals  in  multimedia  conference  system.   The  
MCU 5000A  transmits  audio, motion/still picture image, etc. via transmission 
line.  The MCU 5000A located at the center in the network as the radical topology, 
performs the line connection, video signal switching, and audio  sum  process.
1.02
The MCU 5000A is able to control maximum 16 lines.  Maximum eight 
lines in 16 lines are available to  the  multipoint  teleconference,  and  the  rest  
lines  are   available  to point-to-point or  broadcasting teleconference.  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
During multipoint teleconference performance, received picture image is 
automatically switched current  talker according to the talker  voice detection  or  
level decision.  The MCU 5000A mixes audio signals whenever it receives then 
from all terminals and returns the mixed signals back to all terminal.  Each 
terminal receives the audio signals of all other terminals constantly except its own 
signal.
1.04
The MCU 5000A with the teleconference terminal (VisuaLink AD series) 
provides the following features.
• Broadcasting:  To broadcast the picture image of any teleconference 
terminal to all the other participating teleconference terminals.
• Selective receiving:  To select receiving picture image of any terminal out 
of those of all the participating teleconference terminal.  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:  To control the camera of the terminal from which 
signal is received.  In proprietary mode.
1.05
The tele-education connection can be performed using the optional 
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. 
						

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General Description Manual MCU 5000A Multipoint Control Unit
This page is for your notes. 
						

							NECA 340-414-100 Revision 2.0Page 3
MCU 5000A Multipoint Control Unit General Description Manual
2:  SYSTEM CONFIGURATION
A: Basic 
Configuration2.01
The combination of units as shown in the 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 increasing is required only.  In conformity with the line interface, 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 (Maximum 2 units per subrack)
Table 2-1: MCU 5000A Unit Component
UNIT ITEM DESCRIPTION CODE
CommonMCU 5000A SUBRACK (F1341G) 1 pc
V53 M CONT (Y2573A) 1 pc
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
PWR 
(1 unit per subrack)A AC117V POWER E32-014-Y1573-0B00
B DC -48V (UL) POWER E32-014-Y3757-0A00
A CODEC
(Maximum 2 units per subrack)A CODEC
(4CH/UNIT) E32-441-Y1438-0A00
EC H221 MUX 
(Maximum 8 units per subrack)EC H221 MUX
(1CH/UNIT) E32-482-Y3118-0B00
LIF UNIT
(Maximum 4 units per subrack)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
Data Switch
(for Data Distribute)VDSW E32-465-Y4775-0A00 
						

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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
T1 CableA 15Pin-15Pin Conversion (Straight)10 meter
(for T1 DCE Interface Device Connection)
B 15Pin-15Pin Conversion (Cross)10 meter
(for T1 DTE Interface Device Connection)
Conversion Cable for RS-422/HSD IF Unit
(When a given cable (1 meter) is shortage.)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)
RS-449 Cable 37Pin-37Pin Conversion (Straight)10 meter
Conversion Cable for H0 INTF UnitA 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)
X21 Connection CableA 15Pin-15Pin Conversion (Straight) 2 meter 
B 15Pin-15Pin Conversion (Cross) 2 meter
RS-232C CableA 25Pin-25Pin Conversion (Straight) 2 meter 
B1 25Pin-25Pin Conversion (Cross) 2 meter
B2 25Pin-25Pin Conversion (Cross) 5 meter
B3 25Pin-25Pin Conversion (Cross) 10 meter 
						

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MCU 5000A Multipoint Control Unit General Description Manual
3:  SYSTEM FEATURES
A: Basic Connection 3.01
The MCU 5000A rearplate contains sixteen line connection ports, eight 
HSD data ports, and four RS-232C interface ports. These ports are located   on   as    
shown in  Fig. 3-1. Refer to  the 
NECA 340-414-210.
3.02
The line connection ports (LIF: CH 1 to CH 16) access to the line of the 
teleconference terminal. 
 The MCU 5000A  cascade-connection is required to 
connect between two MCU 5000A line connectors using 
the suitable cable (reverse) as LIF unit.
3.03
The console connection connectors (RS-232C: CH 1 to CH 4) access to 
the MCU 5000A Control Console or plural MCU 5000A Control Console 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.
B: Usable 
Teleconference 
Terminal3.04
The MCU 5000A can be connected to the CODEC which conforms with 
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.
Figure 3-1:   Typical Connecting Diagram
* Through-pass Cable for serial connection
This cable is used for connecting between plural MCU 5000As (Maximum eight). 
Refer to Section K in this manual.
RS-232C HSDLIF
CH1
CH2
CH3
CH4 CONSOLE
FOR DEBUG
LINE 
						

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General Description Manual MCU 5000A Multipoint Control Unit
C: Start-up of 
EquipmentStart-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.
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 
Ty p e3.07
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 line-
connect 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 teleconference.  This connecting condition is the 
unidirection (one way).  The teleconference terminal operation is required without 
H.242 capacity conversion mode.  Local loopback connection is also available.  
The possible connecting number is the same to point-to-point teleconference.
**** Multipoint Teleconference control unit MCU 5000A Ver XX.XX ****
**** Copyright (C) NEC Corporation 1990, 1993 **** 
						

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MCU 5000A Multipoint Control Unit General Description Manual
Multipoint Teleconference (RCON)
3.10
Multipoint teleconference is the teleconference system as the terminals of 
more than three points with the console or wireless remote controller of terminal 
is connected.
3.11
The video, audio, and control data are extracted from H.221 frame signal, 
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 groups within maximum eight (8) terminals 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 the talker detecting function, that switching 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 chairman forcibly operates to switch the video image ([OPR] 
key on remote controller).  In this case, talker detection does not function 
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 with the superimpose 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) 
						

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General Description Manual MCU 5000A Multipoint Control Unit
Multipoint Teleconference (MCON)
3.12
Multipoint teleconference is the teleconference system as the terminals of 
more than three points with the console or wireless remote controller of terminal 
is connected.
3.13
The video, audio, and control data are extracted from H.221 frame signal, 
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 two (2) 
MCU 5000As cascade-connection can be connected to maximum fourteen 
(14) terminals in one multipoint teleconference simultaneously.
• One MCU 5000A has the ability to perform two (2) multipoint 
teleconference groups within maximum eight (8) terminals per one group 
(enable different line rate).  Two (2) MCU 5000As cascade-connection can 
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).
• Through the broadcasting source is switched to the originating image 
automatically by the talker detecting function, that switching operation can 
be changed forcibly with the [LOCAL SEND] key on remote controller.  
Also talker detection can be inhibited with [VOICE ACTIVATE] key on 
the remote controller.
• One of the teleconference terminals can be specified as chairman.  The 
terminal as chairman forcibly operates to switch the video image ([OPR] 
key on remote controller).  In this case, talker detection does not function 
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 
console command, switching the current video image to the specific 
terminal image, is provided without use of the specified receiving function 
for the broadcasting source.
• 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 with the superimpose using by [SITE LIST] key on remote 
controller.  When setting the system parameter, the teleconference terminal 
name registered is transferred to all of the terminals on connecting.  Using 
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.