Fault Repair Procedure - NEC Univerge SV8500 Operation And Maintenance Manual

3. FAULT REPAIR PROCEDURE

This section provides information on how to repair the fault(s) within the system. If any of the components or
equipment listed in Table 5-1 has a failure, move on to the repair procedure explained for each faulty condition.
FAULTY ITEM
Line Fault
Trunk Fault
Unit Fault
Table 5-1 Fault Repair Procedure Quick Reference
FAULTY SITUATION
DP/PB Telephone
Dterm
• No connections can be set up.
• PB/DP signals are erroneously received or sent out
from ORT/SND.
• No three-way calling can be made on CFT, or noise
gets in a established connection.
• A connection results in no speech.
• Noise gets in a established connection.
Faults related to speech.
Dial tone is not heard.
The ACT MUX card side has become faulty and system
changeover has been executed.
CHAPTER 5 Operation Procedure for System with PIR
Dial tone is not heard.
Dialing results in a wrong
connection.
Bell does not ring.
Answer/speech cannot be
made.
• Dterm cannot be operat-
ed.
• Operations are abnormal.
– 595 –
REFERENCE SECTION
Section 3.1.3, Line Fault - When DT
Cannot Be Heard
Section 3.1.4, Line Fault - When
Dialing Results in Wrong
Connection
Section 3.1.5, Line Fault - When
Bell Does Not Ring
Section 3.1.6, When Call Cannot Be
Answered and Speech Cannot Be
Made
Section 3.1.7, Line fault - Dterm
Section 3.2.3, Trunk (ORT, SND,
CFT) Fault and Section 3.2.4, Trunk
(COT, TLT, DTI) Fault
Section 4.4.3, Unit Fault - Fault
Related to Speech
Section 4.4.4, Unit Fault - When
Dial Tone (DT) Cannot Be Heard
Section 4.4.5, Unit Fault - ACT-Side
MUX Card Is Faulty and System
Has Changed Over