NEC Neax 2400 Ipx System Operations And Maintenance Manual

NDA-24307 CHAPTER 2
Page 23
Issue 1
SYSTEM MAINTENANCE OUTLINE
Pattern 2 When the system has a Fusion link with other IPX series and an NCN exists within the system
If the system has a Fusion link also with other IPX series (i.e. the Fusion nodes exist also outside the
system), an NCN can be assigned from either Local Nodes outside the system or the Local Nodes
inside the system. In this example, LN0 of the IPX-U system is designated as the NCN.
Figure 2-18  Example of NCN Assignment (2/3) Note 1:
The...

CHAPTER 2 NDA-24307
Pag e 2 4
Issue 1
SYSTEM MAINTENANCE OUTLINE
Pattern 3  When the system has a Fusion link with other IPX series and an NCN exists outside the system
If the system has a Fusion link also with other IPX series (i.e. the Fusion nodes exist also outside the
system), an NCN can be assigned from either Local Nodes outside the system or the Local Nodes
inside the system. In this example, LN-A (NEAX2400IPX series, 4-IMG type) outside the system is
designated as the NCN.
Figure 2-18  Example...

NDA-24307 CHAPTER 2
Page 25
Issue 1
SYSTEM MAINTENANCE OUTLINE
2.5 System Messages
System messages display during routine diagnosis, system operation status controlling, and fault
occurrence. Figure 2-19 shows an example of a system message.
Refer to Chapter 3 for details on each message.
Figure 2-19   System Message Example (1)           SYSTEM MESSAGE 3-E SUP LOCK UP FAILURE (TEMPORARY)
(2) NEC TOKYO
(3) LP00-0-ACT
(4)
4:0000 0000 0000 0000      5:0000 0000 0000 0000      6:0000 0000 0000 0000 1:1102...

CHAPTER 2 NDA-24307
Pag e 2 6
Issue 1
SYSTEM MAINTENANCE OUTLINE
2.6 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 indicated...

NDA-24307 CHAPTER 2
Page 27
Issue 1
SYSTEM MAINTENANCE OUTLINE
Figure 2-20   Fault Detection General Diagram (via Alarm Lamps on TOPU)
Indication of Fault Occurrence Information Collection
and DiagnosisExample of Faults
CPU
Fault of line/trunk card
TSW write failure,
Fault of clocks, etc.
Abnormal temperature,
power supply failure,
fuse blowing, etc., within
the equipment frame
CPU
Fault of line/trunk card
TSW write failure,
Fault of clocks, etc.
Abnormal temperature,
power supply failure,
fuse blowing,...

CHAPTER 2 NDA-24307
Pag e 2 8
Issue 1
SYSTEM MAINTENANCE OUTLINE
Figure 2-21   Fault Detection Block Diagram (via Display of System Messages)
Indication of Fault Occurrence Information Collection
and DiagnosisExample of Faults
CPU
Fault of line/trunk card
TSW write failure,
Fault of clocks, etc.
Abnormal temperature,
power supply failure,
fuse blowing, etc., within
the equipment frame
CPU
Fault of line/trunk card
TSW write failure,
Fault of clocks, etc.
Abnormal temperature,
power supply failure,
fuse...

NDA-24307 CHAPTER 2
Page 29
Issue 1
SYSTEM MAINTENANCE OUTLINE
Figure 2-22   Fault Detection Block Diagram
PWR
PWR
GT
DLKC
GT
PWR
GTGT
DLKC
To/From TSW
    of each LN
MJ, MN fault
Power, Fuse blown fault
Temperature, CPU fault
Speech Path System fault (SPE)
RGU, Howler fault
PFT fault
CPU Clock fault Note:
CPU
EMAMMC
To  M AT,
Printer, etc.
Alarm Lamps on the TOPU
Thermal Reed Relay
RDY
Clock
etc.
Howler
Ringing
Circuit
Fault
Information
Note
PWR Supply
Failure,
Fuse Blown
Firmware
    Fault
C-level...

CHAPTER 2 NDA-24307
Pag e 3 0
Issue 1
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. When...

NDA-24307 CHAPTER 2
Page 31
Issue 1
SYSTEM MAINTENANCE OUTLINE
2.7 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
Chapter 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 (station...

CHAPTER 2 NDA-24307
Pag e 3 2
Issue 1
SYSTEM MAINTENANCE OUTLINE
Figure 2-23   General System Block Diagram (1/2)
HSW
TSWM0TSWM1
TSWM0TSWM1
< ISW (Inter-node Switch) >
ISAGT:  PZ-GT13          LANI:  PZ-PC19                 IOGT:  PH-GT10          TSW:  PU-SW00
HSW:  PU-SW01           PLO:  PH-CK16/17-A         EMA:  PH-PC40           IOC:  PH-IO24
< LN (Local Node) >
ISAGT-A:  PZ-GT13       ISAGT-B:  PZ-GT20            LANI:  PZ-PC19          GT:  PH-GT09              TSW:  PH-SW12          MUX:...