Harris Corporation Constellation™
Glossary of Alarms 10-11
TROUBLESHOOTING
GUIDELINES
OC3 LPBK
The OC3 signal is in loopback mode
locally.
Clear the loopback test from the
local radio.
CONTROL > hidden menu
OC3 LPBK BY REMOTE
The OC3 signal is looped back on
HLM towards the Modem.
Clear loopback by remote test
from the remote radio.
OC3 REMOTE LPBK
OC3 signal loopback test from the
far end.
Clear remote loopback test from
the local radio.
CONTROL > hidden menu
OC3 RX LOF
Loss of frame into HLM-155 from Hi
Cap Modem.
Check Modem alarms.
OC3 TX LOF
Loss of frame into HLM-155 from
customer.
Check input signal from external
equipment.
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 11.
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
Message Explanation
Course of Action/Possible
Causes
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