ADTRAN 25 Clearing System-Detected Troubles, Complete System Failure, Common Control Trouble

MAINTENANCE

Clearing System-Detected Troubles

Most troubles are detected through the Alarm LED located on the Attendant Console, the Error Log, and, in some cases, the LEDs on the circuit packs (CPs). The following is a list of system troubles. Each item in the list is described in this section.

Complete System Failure

Common Control Trouble

Circuit Pack Trouble

Frontplane Ribbon Connector Trouble (Release 1 Only)

Power Supply Trouble

Fan Assembly Trouble

Overheating Trouble

Backplane and Cabinet Trouble

Emergency Transfer Unit Trouble.

Complete System Failure

A complete system failure is caused by a catastrophic failure in the Common Control circuitry, the power supply, the backplane, or the cabinet. Refer to the relevant procedures below in the event of such a failure. Complete system failures are rare; most failures are of a noncritical component, such as a port on a CP.

Common Control Trouble

Failure of a the Common Control CP (that is, CPU/Memory or Service Circuit) is critical and requires replacement of the faulty pack(s). Failure of these CPs can affect the entire system and may cause the Emergency Transfer Unit (ETU) to activate.

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