FAULT REPAIR PROCEDURES

12. COMMON CHANNEL INTEROFFICE SIGNALING (CCIS) LINE FAULT

This section explains the fault repair procedure when any of the faults shown in Table 5-11occur to a specific CCIS line.

Table 5-11 CCIS Line Fault Situation

FAULTY SITUATION

REFERENCE SECTION

 

 

A specific CCH/CCT card is faulty.

Section 12.3, Specific CCH/CCT Card Is Faulty

 

 

When the signal transmission line is a digital line, transmitting/

Section 12.4, Fault of CCH, DTI and Related Flat

receiving of control signals cannot be performed.

Cable

 

 

12.1 Check Point

When repairing a CCIS Line fault, consider the following items:

(1)Check alarm lamps on the CCH or CCT circuit card.

(2)Refer to Figure 5-23, and check the cable connection.

12.2 CCIS Line Control

The CCH/CCT circuit card controls the signal link (digital) of the interoffice common channel signaling system and transmitting/receiving call processing information. The signal link controls permit normal transmission and reception of call processing information.

A break in signal links is detected, then restored to establish signal links. The call processing information is converted into No. 7 signal format for channel 1 (any channel) of the DTI before being transmitted to a distant office. Figure 5-23shows the CCIS line control route.

MDF

MUX

LT Cable

DTI

Front

Cable

CCH

LT Cable

CCT

To CCIS Line

CPU

TSW

Figure 5-23 Controlling CCIS Line

 

NDA-24300

CHAPTER 5

 

Page 383

 

Issue 1

Page 410
Image 410
NEC NDA-24300 manual Common Channel Interoffice Signaling Ccis Line Fault, Ccis Line Control