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...

Page 20NECA 340-414-100 Revision 2.0
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...

NECA 340-414-100 Revision 2.0Page 21
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...

Page 22NECA 340-414-100 Revision 2.0
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...

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 

Page 24NECA 340-414-100 Revision 2.0
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...

NECA 340-414-100 Revision 2.0Page 25
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...

Page 26NECA 340-414-100 Revision 2.0
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...

NECA 340-414-100 Revision 2.0Page 27
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...

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...