User's Manual

044-05156 Rev C 30
As the voltage returns to nominal levels, the output power will return accordingly. Sufficient hysteresis of at least 0.1
V is included to eliminate 'toggling' at crossover voltage levels.
4.6.5 Amplifier Monitoring
The amplifier alarms are displayed on the front panel indicators and output via a 21-pin connector on the rear of the
module to the subrack summary board for subsequent remote monitoring via the ALARMS connector. The subrack
interprets the amplifier alarms, reacts accordingly, and provides alarm status to the base station through both the
Form-C and RS-485 alarm bus.
Amplifier alarms may be monitored through the dry contact ALARMS 15-pin female D-sub connector on the rear of
the subrack. Refer to Alarm States and ALARMS Connector Definition tables and alarm connector figures below
for pin definition of the alarms connector.
Alarm States
Form-C RS-485
Minor Major Critical Major Critical Minor Major Critical
MCAs
Installed
MCAs
Enabled
Pre-
amp
Pre-
amp
2 2 0 0 0 0
2 1 1 0 1 0
2 0 1 1 0 1
1 1 0 0 0 0
1 0 1 1 0 1
One Fan Fault 1 1
No Fan Fault 0 0
No Preamp Fault 0 0 0 0
One Side Preamp Fault 1 0 1 0
O
P
T
I
O
N
A
L
Both Sides Preamp Fault 1 1 0 1
0 = Low (no alarm)
1 = High (alarm)
4.6.5.1 Form C Alarms (not used)
Form-C Alarms Connector