User's Manual

MCPA Controls and Indicators G3L-2129-140 MCPA
2-2 044-05369 Rev A
MCPA Alarms
MCPA alarm conditions are reported to the system as logic level signals through the rear connector. The front
panel LED provides a visual reference for the operator of MCPA status. Refer to Table 2-1 for a listing of LED
status. Refer to Table 2-2 for a listing of Alarm states.
MCPA Connectors
The MCPA power, alarm, control, and RF connections are made through a D-sub combination male interface
connector located on the rear of the MCPA. Pin assignments are illustrated in Figure 2-2 and listed in Table 2-
3. Alarms are interpreted and generated by the MCPA and reported to the base station as a system level alarm.
The PC I/O RJ-11 connector on the front of the MCPA is for factory use only.
Table 2-2 MCPA Alarm States
Alarm Definition Alarm type/LED Auto-Recovery
Output
Overpower
Disables MCPA immediately if
output power is >+2 dB over rated
output RF power.
Major
(Red)
Input power decreases below APC
threshold (-11.2 dBm)
Automatic
Power Control
(APC)
Enabled if output power is > 52.17
dBm.*
Minor
(Yellow)
MCPA auto-recovers when output
power drops below rated maximum
output power.
Input
Overdrive
Disables MCPA immediately if input
RF drive is >-5 dBm
Major
(Red)
Input power decreases below APC
threshold (-11.2 dBm)
High
Temperature
Disables MCPA if sensor
temperature is > +95° C.
Major
(Red)
MCPA auto-recovers when sensor
temperature drops to less than +85
°C.
High Reverse
Power
Disables MCPA if the reverse RF
output power is higher than 49 dBm
for a duration of 1-minute.
Minor (Yellow)
during 1-
minute
validation
period then
changes to
Major (Red)
Reverse power must be < 48.3 dBm.
Exceed
Maximum
Voltage
Disables MCPA immediately if
supply DC voltage > +30.5 VDC.
Major
(Red)
Auto-recovery when supply voltage
drops to < +29.5 VDC.
Below
Minimum
Voltage
Disables MCPA immediately if
supply DC Voltage < +20.5 VDC
Major
(Red)
Auto-recovery when supply voltage
increases to >+24.0 VDC
Loop Fail
(Linearization
Alarm)
Disables MCPA if loop convergence
fails.
Major
(Red)
Auto-recovery when loop converges.
MCPA tries to auto recover ten times
before permanent shut down. Two
minutes and 5 seconds for each try.
Internal DC
Fail
Alarm if internal voltages fail or out
of range.
Minor
(None)
Auto-recovery once voltage is within
range. No shutdown until linearization
alarm occurs.
Device Fail Alarm if one or more output power
devices fail.
Minor
(None)
No auto-recovery. No shutdown until
linearization alarm occurs.
*Note: If MCPA cannot compensate gain to maintain compliance, Output Overpower or Input Overdrive faults protect
MCPA.
DRAFT