Troubleshooting; Error Detection - Nortel 1200N User Manual

Troubleshooting

Error Detection

NOTE
Centillion 1200N ATM Switch User Manual
NTP 297-8103-903
This chapter describes error detection and troubleshooting of the ATM Switch.
This section describes how the ATM Switch detects errors.
When a problem occurs, it is automatically detected. Problems are automatically
detected in the blocks shown below:
„ Switch/CPU card
„ Line cards
„ Fan unit
„ Power unit
When a problem occurs in ATM Switch, error information is sent from the
hardware to software. The alarm management unit in the software compiles this
information and registers it in an alarm management table.
If an alarm for the hardware or line interface alarm is detected, the ALARM LED
on the ATM Switch will light up. If an external device is connected to the ALARM
OUT connector, the device is also activated.
The error information can be verified by entering a command (DISPLAY alarm,
DISPLAY line) from the MAT.
It is also possible to detect alarms with a diagnosis program.
When the power unit is redundant and one of the power units is turned off,
ALARM LED will light. This is not an error. ALARM LED will turn off when
both power units are turned on.
11
11-1