User Manual

AS4000 Operations and Maintenance

Section

605-0000-431

. Issue 1.6. Date3/2/99

DLP-006

Page 17 of 44 © Copyright Airspan Communications Corporation 1999

ALARM: TU FAIL

Alarm Indications

AS8100 (Sitespan) : ‘Tributary Unit: FRU Fail’

Rack: Major/Prompt

Modem Shelf Alarm Panel: Fault Alarm

Card Alarm: TU Fail

Probable Cause

Failure of the TU card.

Consequences

Loss of service to all subscribers on the modem shelf.

Maintenance Clear Strategy

Change TU Card

STEP PROCEDURE

Observe full ESD precautions.

1. Press Receive Attention on the modem shelf cover to suppress alarm.

2. Before inserting the Tributary Unit check that the DIL switch settings. The Tributary unit

DIL switches should be set as in 1. and should be the same as the card being replaced.