User Manual

AS4000 Operations and Maintenance
Section
605-0000-431
2
. Issue 1.6. Date3/2/99
Page 2 of 8 © Copyright Airspan Communications Corporation 1999
Alignment’, and/or ‘AIS’, been reported. In addition to these, the system may also report
‘Poor BER’ messages on each radio link.
Assuming the PSTN network connection is working and the related event/alarm messages are
cleared, you are recommended to check the subscriber terminal hardware and its deployed
environment when ‘Loss of Comms with ST’, and/or ‘Poor BER’ message is reported.
Important Notes:
Analogue Card Failure:
When the AU card fails, the SC will send ‘FRU failure’ messages to the Sitespan to indicate
each of its shelf elements (TU, Modem 1 to 8, AU and RF) is failing to respond. In this
situation, the engineer can assume the AU has failed. (It is very unlikely that these messages
will occur together ).
Warning: The Analogue Card is not ‘hot plugable’. Power should be disconnected
from the modem shelf before replacing the card. Replace the Analogue Card with a new one
and then restore power to the modem shelf.
RF Card Failure. In the event of the RF card failure, the AU will report the RF card’s failure
to the Sitespan and all modem cards will report ‘Loss of Comms with its STs’ message.
Transmit Radio Failure: a ‘FRU Failure’ on the PA or RF card will imply the total radio
failure and all modem cards in the modem shelves affected will report loss of comms with ST
Receive Radio Failure: a ‘FRU Failure’ on the LNA or RF card will imply the total radio
failure as well.
Warning Monitor Card Removal: Under no circumstances should both monitor
cards be removed from a working system. Together they form a redundant power source to the
CT RF Cards.
Inventory messages (such as card removal/insertion) may be the cause of a number of event
messages.