User's Manual

Lucent Technologies — Proprietary
See notice on first page
22-52
401-660-100 Issue 11 August 2000
as the present LAC alarm status, is necessary in order to properly diagnose
LAC related problems.
Linearizer Faceplate LEDs 0
There are five LEDs on the front faceplate of the Linearizer; four of them are
labeled the same on all LACs, even though the conditions under which they light
are somewhat different for C-Series LACs than for earlier vintages, as described
above.
The position of the LEDs and their labels is shown below, followed by a description
of their functions.
Input Drive
- The RF input to the LAC from the Preamplifier is too high.
Fans
- Provided on C-Series LACs and used to indicate a fan failure. The
associated
LED
is also lighted to indicate which fan has failed; either the LAU,
LZR, or Pre-Amplifier fan.
NOTE:
The preamp fan alarm is associated with LAF position 0 only.
Antenna
- Present but unused on A/B-Series LACs.
Linear Amplifier Unit (LAU)
- Indicates a failure in the LAU; either the LAU fan,
LAM failure(s), or a high temperature condition, which can generate either a
MINOR, MAJOR, or CRITICAL alarm, depending on temperature level. It is also
lighted in the case of a LAM bias voltage problem, which might be due to a power
supply failure or due to a fault in one of the LAMs or its associated power
connector.
PRE-AMPLIFIER
- Any failure associated with the Preamplifier; either the preamp
fan (LAF position 0 only), one of the two preamp fuses, or the preamp itself (a
failure in one side of the internally redundant amplifier, including loss of power, is
detected).
C-Series LACs A/B-Series LACs
•
Input Drive
• I
nput Drive
•
Fans
•
Antenna - (Unused)
•
Linear Amplifier Unit
•
Linear Amplifier Unit
•
Pre-amplifier
•
Pre-amplifier
•
Linearizer
•
Linearizer