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 5-12occur to a specific ISDN.

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/

Section 13.4, Fault of DCH, DTI, and Related Flat

receiving of control signals cannot be performed.

Cable

 

 

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 5-24shows the ISDN line control route.

MDF

MUX

LT Cable

DTI

Front

Cable

DCH

LT Cable

PRT

To ISDN Line

CPU

TSW

 

Figure 5-24 Controlling ISDN Line

CHAPTER 5

NDA-24300

Page 386

 

Issue 1

 

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NEC NDA-24300 manual Integrated Service Digital Network Isdn Line Fault, Isdn Line Control