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Alarm System:
Alarms and operating state are communicated to the BTS via connections to the "Alarm
Terminal Block" at the back of the subrack. The terminal block is internally connected to
dry-contact relays which are located in the MCPA subracks.
ALARM
CATEGORY
Conditions that do not immediately affect system operation, but lead to more serious problems if
Minor
ignored.
Conditions that directly affect amplifier operation (e.g. reduced gain), but allow the system to
Major
continue operating.
Critical
Conditions which result in sector shutdown, preventing any further cellular call traffic.
MCPA LED
Alarm Severity
Status
Green: "ON"
Initial Power-up of
Yellow: ON"
Red: "ON"
Green: "ON"
Normal Operation
Green: "ON"
Yellow: ON"
Yellow: ON"
Red: "ON"
MCPA LEDs
MCPAs.
LEDs all "ON" simultaneously for about 2 seconds.
1. MCPA Fan(s) failure
Minor
2. MCPA high internal temperature (approximately between 80°C
and 90°C).
3. MCPA values indicating: Poor Return Loss (3-8 dB)
Major
1. RF disabled via MCPA panel switch or RFIM command
2. RF Overdrive (gain reduced)
3. DC voltage out of normal range
1. MCPA internal failure
Critical
2. RF Overdrive (> 10 dB)
3. MCPA high internal temperature
(above approximately 90°C).
4. MCPA values indicating: Poor Return Loss (0-3 dB)
Andrew Corporation – Base Station Systems Group
Proprietary – Use pursuant to Company Instruction
SEVERITY
Possible Failure Modes
NONE
NONE
Page 4
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