Overview; Trunk Errors - Avaya MERLIN MAGIX Maintenance And Troubleshooting Manual

Central Office and Private Network Problems

Overview

If you have tested the telephones and the modules in the control unit, you have isolated the trouble
to the trunks or the CO. To isolate the trouble further, follow the instructions in this chapter to
troubleshoot the trunks. If the trouble persists after following these instructions, the customer
should contact the CO and ask a representative to troubleshoot from that end.

Trunk Errors

The system records errors not only for trunks, but for T1 ports on the module as well. In some
cases, errors occur not because a single port fails, but because the entire T1 link fails. When this
happens, 100D automatic testing activates an alarm.
Beginning with MERLIN MAGIX Release 1.5, when there is a T1 link failure the system busies out
the 100R INA and 100 DCD modules and the following occurs:
Calls are dropped, allowing the system to be idle so that programming and maintenance
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functions can be performed.
Automatic Route Selection (ARS) calls immediately overflow to alternate pools.
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When a circuit failure occurs on a 100R INA or 100 DCD module, the following can be observed on
site:
On the 100R INA module, when the T1 link goes down, there is a DS1 Loss of Signal alarm in
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the permanent alarm log, a red LED is illuminated on the module, and the module becomes
maintenance-busy.
When the Loss of Signal alarm is allowed to automatically retire once the T1 link is re-
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established, the red LED goes out and the module restores the functions properly.
When a call is active and the T1 link goes down, the call is dropped by the 100R INA and 100
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DCD modules. (The 100D module does not drop the call.)
When the T1 link is in a Loss of Signal, calls to the pool receive a fast-busy, allowing calls to
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roll over to the next ARS route.
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Overview

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