NEC SV8500 Operation And Maintenance Manual - page 663
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975
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CHAPTER 5
Operation Procedure for System with PIR
4.4
UNIT FAULT
to all the line/trunk circuit cards mounted in a specific unit. Figure 5-6 shows the range of units.
Table 5-6 Unit Fault Situation
FAULT SITUATION
REFERENCE SECTION
Noise, one-way speech, no tone.
Even if dialing has been made, dial tone does not stop.
Section 4.4.3, Unit Fault - Fault Related to
Dial Tone cannot be heard.
System Message “4-S”, “4-T” and “23-Y” is displayed.
Section 4.4.4, Unit Fault - When Dial Tone
MUX card has become faulty and, as a result the CPU has changed over.
System Message “4-S”, “4-T” and “23-Y” is displayed.