User Manual

AS4000 Operations and Maintenance
Appendix
605-0000-431
1
. Issue 1.6. Date3/2/99
Page 1 of 12 © Copyright Airspan Communications Corporation 1999
APPENDIX 1 CENTRAL TERMINAL RACK
GUIDE
1. Overview
This Appendix is designed to be associated with the CT Rack as an aid to locating
components and alarms for the faulting technician.
The Central Terminal (CT) has a number of maintenance-related aids that are
integrated with the rack equipment and which provide local access to and information
related to that equipment.
All Field Replaceable Units (FRU’s), with the exception of the Analogue and RF
cards in the CT rack can be plugged into the rack without removing input power.
(“Hot Plugging”), however users will be disrupted if the unit is involved in the
transport of that call. If the Analogue and RF cards are replaced the shelf will need to
be power cycled in order to initialise the card.
2. LED Visual Indicators
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
to indicate that the unit is operating correctly and a RED LED to indicate that the
unit is faulty. (The red indication is illuminated only when the module in question has
failed. It is not illuminated when the unit is non-operational for other reasons, for
example a fault with a different FRU which prevents normal operation on the system):
• All PSU Modules
• CT Modem Cards
• RF Cards
• Shelf Controllers
• RF PA Modules
• Analogue Cards
In addition to these specific module and card status indications, a number of RED
LED’s are illuminated on the appropriate FRU 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.