NEC Mcu 5000a Multipoint Control Unit Equipment Manual

NECA 340-414-100 Revision 2.0Page 59
MCU 5000A Multipoint Control Unit General Description Manual
Figure 6-3:   MCU 5000A Unit Installation Layout
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Page 60NECA 340-414-100 Revision 2.0
General Description Manual MCU 5000A Multipoint Control Unit
Table 6-1: MCU 5000A Electrical Specification
UNIT ITEM DESCRIPTION
Connected 
Terminal and 
LineTe r m i n a lTeleconference:
VisuaLink AD series
CODEC:
VisuaLink 5000
Accommodating Transmission rate Same line rate terminal.
Line RateAMI (B8ZS)64/2x64/128/192/256/384/2x384/512/768/1152/
1472/1536 kbps.
RS-42256/56×2/64/64×2/128/192/256/384/2x384/512/
768/1152/1536/1920 kbps.
ISDN (H0) 64/2x64/384/2x384...

NECA 340-414-100 Revision 2.0Page 61
MCU 5000A Multipoint Control Unit General Description Manual
7:  SYSTEM CONTROL AND VARIOUS APPLICATIONS 
A: Line Switching 
Control7.01
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...

Page 62NECA 340-414-100 Revision 2.0
General Description Manual MCU 5000A Multipoint Control Unit
Multipoint Connection
7.03
Multipoint teleconference is controlled with the Conference 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...

NECA 340-414-100 Revision 2.0Page 63
MCU 5000A Multipoint Control Unit General Description Manual
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 control of  CPU.  The signal flow of video signals are as shown in 
Fig. 7-3.
Figure 7-3:   Signal Flow of...

Page 64NECA 340-414-100 Revision 2.0
General Description Manual MCU 5000A Multipoint Control Unit
Low-speed Data
7.09
The control data for the multipoint teleconference is transmitted/received 
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 the  
distribution of the electrical whiteboard data is received by the CPU...

NECA 340-414-100 Revision 2.0Page 65
MCU 5000A Multipoint Control Unit General Description Manual
Point-to-Point Connection
7.10
Different from multipoint connection, point-to-point connection sets up 
face-to-face video-teleconference.  This connection is controlled with Conference  
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...

Page 66NECA 340-414-100 Revision 2.0
General Description Manual MCU 5000A Multipoint Control Unit
Broadcast Connection
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...

NECA 340-414-100 Revision 2.0Page 67
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...

Page 68NECA 340-414-100 Revision 2.0
General Description Manual MCU 5000A Multipoint Control Unit
C: Voice Detection 
Control7.21
Voice Detection Control is carried out with the occurrence of interrupting 
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.