NEC Mcu 5000a Multipoint Control Unit Equipment Manual

							NECA 340-414-100 Revision 2.0Page 9
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 sending the signals can be controlled remotely from receiving 
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 groups of the tele-education 
and multipoint teleconferences within maximum eight terminals per one 
group. (Possible to contain the different line rate.)
• The instructor site  is specified when beginning lesson. (one instructor site 
per one group.)
• In normal state, the audio signal of the instructor site is sent to the 
classroom in one way direction, and the audio signals from 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 able to originate simultaneously by the depressing repetition 
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 to the classroom in operation, the picture from instructor 
site to classroom can be switched to the originating classroom picture by 
the command from the instructor site. ([INS/TK] key on remote controller 
in case that the originating classroom exists.) Using the console, the 
broadcasting from the specific teleconference terminal can be performed.
• The tele-education connecting mode inhibits [OPR] and [LOCAL SEND] 
keys. [SLCT RCV], [VOICE ACTIVATE], and [SITE SELECTION] keys 
are available to the instructor site only. 
						

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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 SELECTION] key is 
not prohibited.
• [SLCT RCV] key operation of the instructor site can select the receiving 
picture to the instructor site. In receive selecting mode, the other function 
keys ([TK ALW] key etc.) is prohibited. This application is not available 
to the classroom.
• When the classroom permitted to originate exists, the talker picture can be 
automatically switched between the instructor site and classroom by the 
voice (talker) detection. The voice (talker) detecting operation 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 remote 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 
([TALKER CANCEL] key), the teleconference terminal number returns 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 site inhibits the originating request from the classroom, and 
then can switch to the picture of the instructor site using [START] and [TK 
CNL] keys. The [START] key holds the originating request, and [TK 
CNL] key forcibly cancels the originating 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. 
						

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MCU 5000A Multipoint Control Unit General Description Manual
E: Teleconference 
Start and 
Completion3.15
The teleconference start and completing operation is performed by the 
console command.  Refer to 
NECA 340-414-300.
• 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 teleconference
Start: MCON command (Multipoint connection)
MCNR command (Cascade-connection)
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 release) 
						

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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 mounting condition. Accordingly each LIF unit 
is assigned physical line number (LIF1 to LIF4) respectively.  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 capacity is T1=1536 kbps: 24 time slots, RS-422=1920 
kbps: 30 time slots, ISDN=1472 kbps: 23 time slots 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 logical line number per physical line) 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 
LinesT1 24128643211
RS-4221111111111
ISDN 23 3 
						

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MCU 5000A Multipoint Control Unit General Description Manual
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).
(a) Line Rate 1536kbps
When the line rate is 384 kbps (T1×2 unit installation) and the logical line number 
is ten, to MCON-connect the physical line number 1 to 3, assign MCON 1, 5, 9 as 
the following Fig. 3-2 (b).
*     When these time slots are used, multiplexer (MMM) is required.
(b) Line Rate 384 kbps
Figure 3-2:   Logical Line Number Assignment
1
2
3
4
7 024Logical Line Number Physical Line Number1
2
3
4
7
LIF1
LIF2 (Time Slot)
1
2
3
4 Not Used
7 024Logical Line Number Physical Line Number
LIF1
LIF2 (Time Slot)
1
5
92
3
4
678
10Not Used
Not Used
Not Used
Not UsedNot Used
Not Used
11
1213
14
* 
						

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General Description Manual MCU 5000A Multipoint Control Unit
G: Logical Line 
Number 
Assignment on 
ISDN Interface 
Unit Installation3.20
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 and communication rate as shown in the Fig. 3-3, 3-4, and 3-
5.
(a)  Communicating by 64 kbps
(b)  Communicating by 2×64 kbps
(c)  Communicating by 384 kbps
Figure 3-3:   Logical Line Number Assignment (line Rate 64 kbps)
024Logical Line Number
LIF1
LIF2 (Time Slot)
....................
....................
....................12
34
22
23
25 26 27 28
46 47
49 50
51 5270
71
024Logical Line Number
LIF1
LIF2 (Time Slot)
....................
....................
....................1
35
19 21
25 27
29
43 45
49
5153
67
69
024Logical Line Number
LIF1
LIF2 (Time Slot)
1713
37 25
55 61 31
49 
						

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MCU 5000A Multipoint Control Unit General Description Manual
(a)  Communicating by 64 kbps
(b)  Communicating by 2×64 kbps
(c)  Communicating by 384 kbps
Figure 3-4:   Logical Line Number Assignment (Line Rate 2×64 kbps)
024Logical Line Number
LIF1
LIF2 (Time Slot)
....................
....................
....................12
310
11
13 14
15
2223
25
26 2734
35
024Logical Line Number
LIF1
LIF2 (Time Slot)
....................
....................
....................1
23
1011
13 14
15
22 23
25
2627
34
35
024Logical Line Number
LIF1
LIF2 (Time Slot)
147
19 13
28 31 16
25 
						

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General Description Manual MCU 5000A Multipoint Control Unit
(a)  Communicating by 64 kbps
(b)  Communicating by 2×64 kbps
(c)  Communicating by 384 kbps
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)
024Logical Line Number
LIF1
LIF2 (Time Slot)
123
7 5
10 116
9
024Logical Line Number
LIF1
LIF2 (Time Slot)
123
7 5
10 116
9
024Logical Line Number
LIF1
LIF2 (Time Slot)
123
7 5
10 11 6
9 
						

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MCU 5000A Multipoint Control Unit General Description Manual
Teleconference Port Number
3.21
The MCU 5000A provides maximum eight points in multipoint 
teleconference.  MUX unit port number in that multipoint teleconference is 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 except cascade port.  The teleconference terminal number “0” 
assignment has the simultaneous activity for all of the teleconferences in the 
group. 
						

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General Description Manual MCU 5000A Multipoint Control Unit
H: Line Interface 3.23
The MCU 5000A provides the following 3 types of LIF unit for the line 
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
Four number of channels are accommodated in one 1.5M LIF unit. When 
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 multiplex the plural 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):
• 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