NEC SV8500 Operation And Maintenance Manual - page 674
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CHAPTER 5
Operation Procedure for System with PIR
4.5
SPEECH PATH (TSW) SYSTEM FAULT
This section explains the fault repair procedure when any of the faults shown in Table 5-7 has occurred in
the whole system.
Table 5-7 Speech Path (TSW) System Fault Situation
FAULTY SITUATION
REFERENCE SECTION
• Noise, one-way speech, no tone
• Even if dialing has been made, dial tone does not stop.
Section 4.5.2, Speech Path System Fault - Fault
Dial tone cannot be heard.
Section 4.5.3, Speech Path System Fault - When
Dial Tone (DT) Cannot Be Heard
A fault occurring in the STBY side TSW is indicated by a system
message or an alarm lamp.