NEC ND-71762(E) system manual Ccis Common Channel Interoffice Signaling Line Fault, Check Point

MAINTENANCE PROCEDURE

3. CCIS (Common Channel Interoffice Signaling) Line Fault

This paragraph explains the fault repair procedure when any of the faults shown in Table 8-1 occur to a specific CCIS line.

3.1 Check Point

When repairing a CCIS Line fault, consider the following:

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

(2)By referring to Figure 8-5, check the cable connection.

3.2 CCIS Line Control

The CCH within the CCH/CCT circuit card controls the signal link of the interoffice common channel signaling sys- tem and transmits/receives call processing information.

The signal link controls to send/receive the call processing information.

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 8-5 Controlling the CCIS Line

MUX

CPU TSW

MDF

LT Cable

DTI

FRONT

CABLE

CCH

CCH MODEM MODEM CABLE

CCT

LT Cable MDF

To CCIS Line

CHAPTER 8 ND-71762 (E)

Page 114

Issue 2