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CHAPTER 1 General
Figure 1-13 Fault Detection Block Diagram (4-IMG)
(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, that identifies the cause of the fault and
determines whether the fault is temporary or permanent. When the fault affects system operations,
Active/Standby status of the CPU is changed over (provided that the system has dual configuration).
• Bus System Fault
SYMBOL MEANING SYMBOL MEANING
CPU Central Processing Unit PWR Power Supply
EMA Emergency Alarm Controller DLKC Data Link Controller
IOC I/O Controller TSW Time Division Switch
LC/TRK Line/Trunk MUX Multiplexer
GT/EXB Gate card TSWM Time Division Switch Module
LC/TRK
MUX
GT
TSW
PWR
PLO
PWR
CPU
(IOC)
TSWR
EXB
EMA
- Symbols -
: Circuit Card in PIR/TSWR
: Card in SV8500 Server
: Faults to be detected
: Speech Path
: Fault Information flow
(Note)
(Note)
Fault Information:
MJ, MN faults
Power OFF, blown fuse
CPU faults
Speech Path faults
RGU, Howler faults
CPU Clock faults
Software abnormal
behavior monitor
PCPro
Ready
Clock
Ready
Clock
Ready
Clock
Firmware
faults
Fault
Information
Power off,
blown fuse
printer, etc.
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