NEC Mcu 5000a Multipoint Control Unit Equipment Manual

							NECA 340-414-100 Revision 2.0Page 19
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 LIF.  The HSD interface is available with strap setting.      
(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 
						

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General Description Manual MCU 5000A Multipoint Control Unit
Common Item for Each LIF Unit
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.
I: Cascade-
Connection3.28
When two MCU 5000As are cascade-connected, the number of the 
terminal in multipoint teleconference become 14 terminals.  Fig. 3-6 shows the   
cascade-connection of  two MCU 5000As.  One (Master) of two MCU 5000As 
has the initiative controls 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 connected using 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 slave receives the connecting data after issuing the connecting 
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 also accepted.  In this case, the teleconference terminals in the master 
is first accepted.  The terminals in the slave is just accepted at the time of the 
command issue of the slave.
3.31
After connecting, all of the teleconference control commands within the 
group is entered from the master terminal.  (not execute from the slave 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.) 
						

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MCU 5000A Multipoint Control Unit General Description Manual
Figure 3-6:   Casade-Connection of Two MCU 5000A
Figure 3-7:   Two Groups Casade-Connection
J: Console Through-
Pass3.33
The MCU 5000A, which provides the three console ports, is 
simultaneously controlled from 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 between CH3 and CH2.  (In this case, the system 
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 identification   
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 console.  The response to all of the MCU 5000A can be executed 
by system parameter setting.  For that parameter refer to 
NECA 340-414-220.
RS-232C HSDLIF
CH1
CH2
CH3
CH4RS-232C HSDLIF
CH1
CH2
CH3
CH4
Cascade Line Console
Console Through-Pass
A
BB
A Master
SlaveSlave
Master MCU1 MCU2 
						

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General Description Manual MCU 5000A Multipoint Control Unit
K: Supplementary 
Functions3.35
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 teleconference    
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 automatic starting is registered in the memory card using 
CGPR command from the console.  Refer to 
NECA 340-414-300.
Memory Card Copy Function
3.37
Using the console command (CPMC), the data in the memory card  can 
be copied another memory card.  Refer to 
NECA 340-414-300.
Loopback Function
3.38
The MCU 5000A provides the local/remote loopback function for line, 
video, audio, and data.  Refer to 
NECA 340-414-500.
Figure 3-8:   Example of Console Through-Pass Connection
ConsoleMCU1MCU2 MCU3 1
231
231
23
Local
Local Local
Identification Code = 00H
Identification Code = 10HIdentification Code = 20H 
						

							NECA 340-4 14- 10 0  Revisio n 2.0   Page 23
MCU 5000A Multipoint Control  U nit   General Description Manual
4:  HARD WAR E C ONFIGUR ATION
LIN E  DATA R
R
L
8
8
8
4
C PU  BUS  
CPU  B U S
8
8
88
HSD 
						

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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 clock pulse with IPAT (PEB2235), converts bipolar  
signal to unipolar, and sends it to ACFA (PEB2035).  ACFA detects frame 
synchronization and transmission line failure.  ACFA converts incoming signal 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 from 2.04 Mbps to 1.544 Mbps, and sends the converted signal 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) Primary 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 
independently 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 through 4 is selected with CPU control, 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 performed. 
						

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MCU 5000A Multipoint Control Unit General Description Manual
Functional Block Diagram
4.05
Fig. 4-2 shows 1.5M LIF unit block diagram.
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.
 
1.544 Mbps
LINE INF 1
1.544 Mbps
LINE INF 2
1.544 Mbps
LINE INF 3
1.544 Mbps
LINE INF 4MULTICONFERENCE DATA BUS
(LD S/R)
POINT-TO-POINT
CONFERENCE BUS
(LB) IPAT
IPAT
IPAT
IPATAC FA
AC FA
AC FA
ACFAMTSC
x4
RELAY
LOOPBACKLED
SW IDICU
(UPD71059)CPU BUSTO/ FROM
LIF 2, 3, 4TO/FROM
MUX UNIT
OSP, 4M CLK
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 to 210 m 7 steps programmable setting
Connector D-sub 15 pin female 
						

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General Description Manual MCU 5000A Multipoint Control Unit
 (2) Table 4-2 and  Fig. 4-3 shows 1.5M LIF Connector Pin Assignment
-:  Not Used
Figure 4-3:   1.5M LIF (CH1 to CH16) 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- 13-
6- 14-
7- 15-
8 SG Signal ground
81
9
15 
						

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MCU 5000A Multipoint Control Unit General Description Manual
Line Management
4.06
The MCU 5000A manages for line state according to the following Table 
4-3.
_: Not transit
/: Not existed
Fz: Transit to Fz state TABLE 4-3  Table 4-3: User Side Primary Tributary Rate Layer 1 Status Transition (Pick-up)
INITIAL STATE F0 F1 F2 F3 F4 F5
STATE 
DEFINITIONOperation or Failure 
statePower OFF
(user side)Active FC1 FC2 FC3 FC4
STATE 
DEFINITIONSignaling 
 for InterfaceNo Data Normal 
Active FrameNormal 
Active FrameFrame with 
RAYFrame with 
RAYNormal 
Active Frame
NEW RECEIVE 
EVENTPower OFF/ F0F0F0F0F0
NEW RECEIVE 
EVENTPower ONF5/////
NEW RECEIVE 
EVENTNormal Active Frame 
from Network/ _ F1 F1 F1 F1
NEW RECEIVE 
EVENTRAI Receive/ F2 _ F2F2F2
NEW RECEIVE 
EVENTOut of Frame or Loss of 
Signal/ F3F3 _ F3F3
NEW RECEIVE 
EVENTAIS Receive/ F4F4F4 _ F4 
						

							Page 28NECA 340-414-100 Revision 2.0
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) from a transmission  line.  After extracting  the clock 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 lines (minimum 56 kbps 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 corresponding  line on MTSC, converts the bit rate  
from 2.048 Mbps to that of the transmission line sends it to the transmission 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 frame synchronizing detection 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 independently 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 line 1 through 4 (sending/receiving 4) is selected 
with CPU control, and the received clock signal for synchronization is sent 
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