NEC Neax 2400 Imx System Operations And Maintenance Manual

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SYSTEM MAINTENANCE OUTLINE
2.4 System Messages
System messages display during routine diagnosis, system operation status controlling, and fault occur-
rence. Figure 2-12 shows an example of a system message.
Refer to Chapter 3 for details on each message.
Figure 2-12   System Message Example (1)           SYSTEM MESSAGE 3-E SUP LOCK UP FAILURE (TEMPORARY)
(2) NEC TOKYO                  JUL 24 09:35
(3) LP00-0-ACT
(4)
4:0000 0000 0000 0000      5:0000 0000 0000...

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2.5 Fault Detecting Function
The system finds a fault by its fault detecting circuit and the fault detecting program. Once a fault occurs,
the system initiates a remedial action such as system changeover, make-busy setting, or restart processing
by the automatic diagnosis function. This action reduces the influence of the fault so that system servicing
may be minimized. The result of the process taken and the fault situation are...

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SYSTEM MAINTENANCE OUTLINE
Figure 2-14   Fault Detection Block Diagram
TSW/INT
LC/TRK
MUX
CPU
EMA
PWR
DLKC
GT
To MAT,
Printer, etc.
Alarm Lamps on TOPU
Thermal Reed Relay
TSWM
RDY
Clock
etc.
Howler
Ringing
Circuit
Fault
Note
PWR Supply
Failure,
Fuse Blown
Ready
IOC
Symbols
: Circuit Card
: Main faults to be detected
: Speech path
: Flow of fault information
SYMBOL NAME SYMBOL NAME
CPU
EMA
IOC
LC/TRK
GT
PWRDLKC
INT
TSW
MUX
TSWM Central Processing Unit
Emergency...

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SYSTEM MAINTENANCE OUTLINE
(a) Main Faults
Faults that may occur in the system can be generally categorized into Processor System Fault, Speech
Path System Fault, Line/Trunk Fault, etc.
 Processor System Fault
The CPU alarm detecting circuit continuously monitors whether the CPU is working normally. If
a fault is detected, the CPU calls up the diagnostic program, which identifies the cause of the fault
and determines whether the fault is temporary or permanent....

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SYSTEM MAINTENANCE OUTLINE
2.6 Range of Faults Specification
(1) Upon receiving a fault report from a station user or an operator, the technician can assume a faulty card
exists if the range to be affected by the fault can be determined. For the detailed procedure, refer to Chap-
ter 5. Use the following actions to check the MDF:
(a) Check the LENS of the reporter (Station or ATTCON/DESKCON).
(b) Check other circuits of the circuit card in which the reporter...

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SYSTEM MAINTENANCE OUTLINE
Figure 2-15   General System Block Diagram
CPU 0
To MUXTo MUX
To MUX (IMG2)
To MUX (IMG2)
To MUX (IMG3)
To MUX (IMG3)
IMG0
TSWM
LPM
MISC I/O BUS
MISC I/O BUS MISC I/O BUS
01
E1/DS1
with
Fusion LinkE1/DS1
with
Fusion Link SERIAL BUS
PM BUS
PM BUS
PM BUS
PM BUSPM BUS
PM BUS
PM BUS
PM BUS
T
S
W
 I
 /
O
B
U
S
0
RS-232C
10 BASE-T 10 BASE-T 10 BASE-T
G
T
U
S
Symbols
EMA:  PH-PC40      ISAGT:  PZ-GT13       LANI:  PZ-PC19      GT:  PH-GT09...

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Figure 2-16   CPU Controlling Block Diagram
LPM
EMAIOC /
MISC
ISAGT 0
LANI
PWR
PWR
CPU 0
MEMORY
PCI BUSISA BUS
CPU board CPR
CPU clock
   CPR
(ST-BY)
Reset Signal
MISC BUS
MISC BUS
ISAGT 1 T
MT
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
IMG0
PIM 3
PIM 2
PIM 1
PIM 0
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM...

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Figure 2-16  CPU Controlling Block Diagram (Continued)
LPM
EMAIOC /
MISC
ISAGT 0
LANI
PWR
PWR
CPU 0
MEMORY
PCI BUSISA BUS
CPU board CPR
CPU clock
   CPR
(ST-BY)
Reset Signal
MISC BUS
MISC BUS
ISAGT 1 T
MT
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
IMG2
PIM 3
PIM 2
PIM 1
PIM 0
LC/TRK
MUX
MUX
LC/TRK
PM BUS
PM BUS
LC/TRK
MUX
MUX
LC/TRK
PM...

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SYSTEM MAINTENANCE OUTLINE
Figure 2-17   Speech Path Block Diagram
IMG0
TSW
02
To IMG2
TSWM
TSW 00
TSW/INTMUX 003
MUX 002
MUX 001
MUX 000
PIM 3
LC/TRK
MUX
Symbols
          :  Speech Path 
          :  Circuit Card (active)
TSW:  PH-SW12
MUX:  PH-PC36 
LC/TRKLC/TRK
MUX
PIM 2
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 1
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 0
LC/TRK
MUX
LC/TRKLC/TRK
MUX
IMG1
PIM 3
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 2
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 1
LC/TRK
MUX...

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SYSTEM MAINTENANCE OUTLINE
Figure 2-17  Speech Path Block Diagram (Continued)
IMG2
TSW
00
To IMG0
TSWM
TSW 02
TSW/INTMUX 023
MUX 022
MUX 021
MUX 020
PIM 3
LC/TRK
MUX
Symbols
          :  Speech Path 
          :  Circuit Card (Active)
TSW:  PH-SW12
MUX:  PH-PC36 
LC/TRKLC/TRK
MUX
PIM 2
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 1
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 0
LC/TRK
MUX
LC/TRKLC/TRK
MUX
IMG3
PIM 3
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 2
LC/TRK
MUX
LC/TRKLC/TRK
MUX
PIM 1...