User's Manual

Lucent Technologies — Proprietary
See notice on first page
401-660-100 Issue 11 August 2000
22-41
Linear Amplifier Circuit (LAC) Maintenance
5. If the alarm remains clear, try other combinations of radios as described in
the Radio Control Procedure. Be sure the LAC is not reporting a SANITY
alarm at the MSC.
6. After leaving the site, continue to monitor the LAC from the MSC to
determine if the alarm has cleared. If the alarm returns, go back to the site
and query the microprocessor.
Checking the Microprocessor Alarm Registers
The LAC's microprocessor stores the current LAC alarm status as well as
information about what caused Processor MINOR alarms. To access this
information, the LAF frames must be disconnected from the alarm bus and
connected to a FITS computer via a customized IEEE-488 to RS-422 Converter.
Even though this will result in SANITY alarms at the MSC for all LACs, this
procedure will not interfere with live traffic at the cell site.
An LAC should not be
replaced for MINOR alarms unless it has issued a Processor alarm.
*
To read the LAC Processor alarm registers, connect the FITS computer to the
LAC alarm bus and run the LAQS software. After reading the Processor Alarm
Registers, refer to the following sections for corrective actions. Refer to Paragraph
E for detailed instructions on using the LAQS software.
* Except for A/B-Series LACs with a LAM Bias Fault (see LAM Bias Fault procedure).