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CHAPTER 5 NDA-24300
Page 386
Issue 1
FAULT REPAIR PROCEDURES
13. INTEGRATED SERVICE DIGITAL NETWORK (ISDN) LINE FAULT
This section explains the fault repair procedure when any of the faults shown in Table 5-12 occur to a specific
ISDN.
13.1 Check Point
When repairing an ISDN Line fault, consider the following items:
(1) Check alarm lamps on the DCH or PRT circuit card.
(2) Refer to Figure 5-24, and check the cable connection.
13.2 ISDN Line Control
The DCH/PRT circuit card controls the signal link (digital) of the ISDN line and transmits/receives call
processing information.
The signal link controls permit normal transmission and reception of call processing information. Figure
5-24 shows the ISDN line control route.
Figure 5-24 Controlling ISDN Line
Table 5-12 ISDN Line Fault Situation
FAULTY SITUATION REFERENCE SECTION
A specific CCH/CCT card is faulty. Section 13.3, Specific DCH/PRT Card Is Faulty
When the signal transmission line is a digital line, transmitting/
receiving of control signals cannot be performed.
Section 13.4, Fault of DCH, DTI, and Related Flat
Cable
CPU TSW
MUX
DCH
PRT
DTI
LT Cable
Front
Cable
MDF
To ISDN Line
LT Cable