User Manual

AS4000 Operations and Maintenance
Section
605-0000-431
4
. Issue 1.6. Date3/2/99
Page 1 of 44 © Copyright Airspan Communications Corporation 1999
SECTION 4: FAULT DIAGNOSIS CT
3. Faults at CT site
3.1. Visual
Visual indicators, in the form of Light Emitting Diodes (LED’s) mounted on certain
equipment items, show the status of that item. Each of the following modules within
the CT equipment rack has an AMBER LED (except the TU) to indicate the unit is
operating correctly and a RED LED to indicate that the unit is faulty:-
All PSU Modules
CT Modem Modules
RF Modules
Shelf Controllers
TU Module (does not contain a PSU no LEDs lit if operating correctly)
RF Combiner PA Modules
Analogue Cards
Monitor Card (MON1)
The RED LEDs on each unit will be illuminated on the appropriate module whenever
the following fault conditions are detected:-
• Radio link failure
• Low RF output power at Combiner
• Rx link faulty on TU (Rx AIS - fault outside the AS4000 system)
• 2Mbit/s link failure
• Loss of communication with management system
Each of the Modem Cards has 2 AMBER LED’s that are illuminated whenever the
telephony channel between NTU and TU is open for subscriber traffic.