P. G.
TM0047
2-4
The DC current monitoring triggers a fault condition if DC bias current deviates outside
predetermined high or low current limits.
The downlink RF output power from each frequency band is monitored by separate
detectors and a FAULT condition is triggered if the level in either band drops below a
nominal level of + 5 dBm. If the amplifier is to be installed at a point in the system where
the output power in either band may be less than +7 dBm then the RF monitor circuit for
the appropriate band should be disabled as described in Section 4 herein.
The local fault indicators indicate specific faults as follows:
SMR
BIAS
Bias
fault
in the SMR amplifier
PWR Low downlink RF power from the SMR amplifier
PCS
BIAS Bias fault in the PCS amplifier
PWR Low downlink RF power from the PCS amplifier
NOTE:
There is a certain situation in which the red “FAULT” indicator will be on even
though none of the cellular or PCS “BIAS” or ‘PWR” indicators are on. This
situation occurs when the unit is receiving local power and downlink RF powers
are normal but the cable power is not present. This indicates that the cable
power source located upstream has been switched off or has shut down.
