NEC NDA-24300 manual Fault Detection Block Diagram

Models: NDA-24300

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SYSTEM MAINTENANCE OUTLINE

Alarm Lamps on TOPU

Symbols

: Circuit Card

: Main faults to be detected

: Speech path

 

Firmware

: Flow of fault information

 

Fault

 

 

C-level monitor

 

 

 

 

 

 

 

 

 

 

 

To MAT,

 

 

 

 

 

 

 

CPU

 

 

 

 

 

 

Printer, etc.

 

IOC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note: MJ, MN fault

 

 

 

 

 

Fault

 

 

 

 

 

Information

Power, Fuse blown fault

 

Note

Temperature, CPU fault

Speech Path System fault (SPE)

RGU, Howler fault

PFT fault

CPU Clock fault

 

 

Thermal Reed Relay

 

 

LC/TRK

RDY

 

 

Clock

 

 

etc.

MUX

TSWM

RDY

 

 

Clock

TSW/INT

 

Write

 

 

 

etc.

 

 

Ready

DLKC

GT

 

 

Howler

 

 

Ringing

 

PWR

Circuit

 

 

 

 

PWR Supply

 

 

Failure,

 

 

Fuse Blown

EMA

 

 

SYMBOL

NAME

SYMBOL

NAME

 

 

 

 

CPU

Central Processing Unit

DLKC

Data Link Controller

 

 

 

 

EMA

Emergency Alarm Controller

INT

Speech Path Control Interface

 

 

 

 

IOC

I/O Controller

TSW

Time Division Switch

 

 

 

 

LC/TRK

Line/Trunk

MUX

Multiplexer

 

 

 

 

GT

Gate

TSWM

Time Division Switch Module

 

 

 

 

PWR

Power Supply

 

 

 

 

 

 

Figure 2-14 Fault Detection Block Diagram

CHAPTER 2

NDA-24300

Page 16

Issue 1

Page 43
Image 43
NEC NDA-24300 manual Fault Detection Block Diagram