Harris Corporation Constellation™
Troubleshooting Guidelines 11-11
TROUBLESHOOTING
GUIDELINES
ONLINE ALIGNMENT A, B HLM unable to bit-align receiver
delay difference. Rx switching will
not be errorless.
Check Modem alarms.
OUTPUT FAIL
(DS3, Tributary, Wayside)
No output signal or signal level too
low (-3 dB).
Check for improper line
termination.
Replace High Level Mux.
OUTPUT POWER LOW RF output level from the
Transmitter Assembly is at least
3dB low.
Check configuration.
Could be a bad multiplier/picket
filter.
Replace Transmitter.
PROTECT M12-1 ... M12-8 Designated M12 Unit is protected by
a standby M12 Unit.
Check M12 Unit. Replace the
Unit if needed.
PS ABSENT (A1, A2 / B1,
B2)
Power Supply unplugged.
Power Supply not installed per
configuration.
Defective Power Supply.
Is the Power Supply plugged in?
Install Power Supply card.
Replace the Power Supply. See
Chapter 12.
REMOTE SYNC LOSS A, B Coordinating loss of framing at the
far end.
Start the troubleshooting of the
far-end radio.
RSL LOW A1,A2 / B1,B2 RF level into Receiver Assembly
<
10 dB above system threshold.
Check the following:
Receiver frequency setting
Receiver Assembly
far-end Transmitter level
antenna alignment
multiplier/picket filter
RX ABSENT (A1, A2 / B1,
B2)
Receiver Assembly unplugged or not
installed per configuration.
Power Supply turned off.
Defective Receiver Assembly.
Ensure that the Receiver
Assembly is plugged into the
backplane.
If all 3 RF cards show absent
alarms, the trouble is most
likely to be in the Power Supply.
Replace the PS card.
Before turning on the PS, turn
off the Tx.
Replace the Receiver Assembly.
See Chapter 12.
RX DECODER Modem decoder is in alarm state. Fault may be in
The Receiver
The path
Far-end Transmitter
Far-end Modem
Near-end Modem (least likely).
Message Explanation
Course of Action/Possible
Causes
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