Nortel Meridian Meridian 1, Планирование, установка и инструкции по эксплуатации

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Chapter 25 — Fault locating and clearing Page 481 of 536
Option 11C Compact Planning, Installation, Fault Clearing and CCBR Guide
Clearing Network faults
Network faults
Network functions in the Option 11C Compact are an integral part of the
NTMW01 SSC card. It provides speech path switching and transmit and
receive signaling messages from the CPU. Network functions include:
• Conference/Tone and Digit Switch
• Digital switching and conferencing for the system
• Serial Data Interface
• Ethernet controller
Network faults can cause system initializations and disable conference
capability or all terminal connections (such as trunks and telephones) on a
card. Network faults can make functional Peripheral Equipment seem faulty.
Fault clearing procedures
Manual Continuity Tests can be used to isolate Network faults and Peripheral
Equipment faults. See “LD 30” in the Option 11C Compact software guide
for details on performing the tests.
Table 71 lists common Network fault indications. To clear faults, select the
symptom listed in this section that most resembles the fault indications and
go through the procedure for clearing each possible cause until the fault is
fixed. Once the fault is corrected, disregard the remaining possible causes.
Clear any power or Common Equipment faults before attempting to clear
Network faults.
If the fault is not cleared after you have gone through each possible cause,
check the most recent fault indications. Also check
“How to clear faults” on
page 458 to see if another type of fault is indicated.
After the fault is corrected, go to “Final maintenance procedure” on page 534
to completely restore normal operation.