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CHAPTER 1 General
5. REPORTING FAULT TO NEC
When the cause of a fault is uncertain, make note of the situation involved and report it to NEC. When
forwarding faulty circuit cards to NEC, exercise caution to protect from static electricity.
5.1 Fault Reporting Method
The following three items must be included in the report without fail:
(1) Faulty situation (reports should be similar to “dial tone is not heard only on individual lines,” “incoming
C.O. line calls are not able to be terminated only to a specific ATTCON/DESKCON,” etc.)
• Faulty phenomena
On lifting the handset, dial tone is not heard but side tone is heard, etc.
• History of fault
When did the fault occur? What kind of repair procedure has been executed? Does the fault still exist
or not exist? etc.
• Range of fault
Range of fault should be reported: Single line?, Specific trunk?, Specific circuit card?, Specific PIR?,
Whole system?, etc.
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