NEC Mcu 5000a Multipoint Control Unit Equipment Manual

NECA 340-414-500 Revision 2.0 Page 1 of 2
MCU 5000A Multipoint Control Unit TCP-004
 EXECUTION OF MCU 5000A LOOP TEST
GENERAL: 
Perform a MCU 5000A loopback test at an arbitrary loop point using 
TLOP
 command, referring to NECA 340-414-300
.
APPARATUS: 
MCU console
STEP PROCEDURE REFERENCE NO.
1 Has the MCU console been started up?
 
If YES
, go to Step 3
.
If NO
, go to Step 2
.
2 Start the MCU console up and put it into communication state.TCP-016
3 Before the execution of loop test, the loopback...

Page 2 of 2 NECA 340-414-500 Revision 2.0
TCP-004 MCU 5000A Multipoint Control Unit
This page is for your notes. 

NECA 340-414-500 Revision 2.0 Page 1 of 2
MCU 5000A Multipoint Control Unit TCP-005
  TROUBLESHOOTING OF M CONT UNIT
GENERAL: 
Sectionalization of the failure is performed by the front lamp (LED) 
indication of M CONT unit.
APPARATUS: 
None
STEP PROCEDURE REFERENCE NO.
Note:
  Location of SWs, Straps, LEDs, and list of LED function are shown in 
GSD-009
.
1 Verify the LED condition.
If ST1 to ST6 are indicated steadily, go to Step 2
.
If ST7 is lit, go to Step 3
.
If ST8 is lit, go to Step 4
.
2 When ST1...

Page 2 of 2 NECA 340-414-500 Revision 2.0
TCP-005 MCU 5000A Multipoint Control Unit
TROUBLESHOOTING OF M CONT UNIT
STEP PROCEDURE REFERENCE NO.
7 Verify the state of Memory Card using RMCS command.
If response is displayed with LOW BATTERY VOLTAGE
, replace the 
battery with a new one.
If  response is displayed with ERR81
, replace the Memory Card with a new 
one.TCP-019
8 End of procedure. 

NECA 340-414-500 Revision 2.0 Page 1 of 2
MCU 5000A Multipoint Control Unit TCP-006
TROUBLESHOOTING OF 1.5M LIF UNIT
GENERAL: 
Sectionalization of the failure is performed by the LED indication of 1.5M 
LIF unit.
APPARATUS:  
MCU console
STEP PROCEDURE REFERENCE NO.
Note 1:
Mounting positions of LEDs and SW and the list of LED functions 
are shown in GSD-001
.
Note 2:
When the LED of the CH (channel) in use is lit, there is a failure in 
the line. However, LEDs in the unused channels are always lit. 
The...

Page 2 of 2 NECA 340-414-500 Revision 2.0
TCP-006 MCU 5000A Multipoint Control Unit
This page is for your notes. 

NECA 340-414-500 Revision 2.0 Page 1 of 2
MCU 5000A Multipoint Control Unit TCP-007
 TROUBLESHOOTING OF RS-422 LIF UNIT
GENERAL: 
Sectionalization of the failure is performed by the front lamp (LED) 
indication of RS-422 LIF unit.
APPARATUS: 
MCU console
STEP PROCEDURE REFERENCE NO.
Note 1:
Location of  SWs, Straps, LEDs, and list of LED function are 
shown in GSD-002
.
Note 2:In the case where the LED of the CH (channel) in use is lit, there 
is a failure in the line. However, LEDs in the unused...

Page 2 of 2 NECA 340-414-500 Revision 2.0
TCP-007 MCU 5000A Multipoint Control Unit
This page is for your notes. 

NECA 340-414-500 Revision 2.0 Page 1 of 2
MCU 5000A Multipoint Control Unit TCP-008
  TROUBLESHOOTING OF H0-INF LIF UNIT
GENERAL: 
Sectionalization of the failure is conducted by the front lamp (LED) 
indication of H0-INF LIF unit.
APPARATUS: 
MCU console
STEP PROCEDURE REFERENCE NO.
Note 1:
Location of  SWs, Straps, LEDs, and list of LED function are 
shown in GSD-003
.
Note 2:
In the case where the LED of the CH (channel) in use is lit, there 
is a failure in the line. However, LEDs in the unused...

Page 2 of 2 NECA 340-414-500 Revision 2.0
TCP-008 MCU 5000A Multipoint Control Unit
This page is for your notes.