Harris Corporation Constellation™
Troubleshooting Guidelines 11-7
TROUBLESHOOTING
GUIDELINES
Glossary of Alarms
Message Explanation
Course of Action/Possible
Causes
+10.5 V PA Power Supply voltage output for the
Transmitter power amplifier is
beyond the
± 5% to 7% tolerance.
This alarm is asserted
momentarily if the TX
synthesizer unlocks. Otherwise,
it is an indication of power
supply failure.
+10.5 V Power Supply voltage output for the
Receiver is beyond the
± 5% to 7%
tolerance.
An indication of power supply
failure.
±12V Power Supply voltage output for the
Transmitter and Receiver is beyond
the ± 5% to 7% tolerance.
An indication of power supply
failure.
+5V Power Supply voltage output for the
Transmitter and Receiver is beyond
the
± 5% to 7% tolerance.
An indication of power supply
failure.
AGC RF signal into the Receiver is too
low.
Check the following:
RX frequency setting
RX module
far-end TX level
antenna alignment
multiplier/picket filter.
AIS INPUT (DS3)
AIS INPUT (Tributary
A1-A28, B1-B16)
AIS signal present at DS3 input.
AIS signal present at DS1 input.
Indication of input signal status.
AIS RECEIVED (DS3) Coordinating DS3 interface not
receiving valid input signal.
Check far-end DS3 input.
AIS RECEIVED (Tributary
A1-A28, B1-B16)
Coordinating HLM is not receiving
valid signal from M12 Unit, or far-
end DS1xx input is lost.
Check far-end M12 Unit and
DS1 inputs.
ALIGNMENT A, B HLM unable to bit-align receiver
delay difference.
Reset the HLM unit (unseat from
the backplane and reseat).
BIPOLAR VIOLATION Input signal in violation of bipolar
requirements.
Use the Keypad to verify the
signal coding.
CONFIGURATION >
TRIBUTARIES > CODE >
TRIBUTARY X CODE
CARRIER LOSS
CARRIER LOSS A, B
Modem cannot lock on signal. Fault may be in the Rx, path,
far-end Tx, far-end Modem,
near-end Modem (least likely).
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