Harris Corporation Constellation™
Glossary of Alarms 10-13
TROUBLESHOOTING
GUIDELINES
SYNC LOSS A, B (HLM-1,
2)
SYNC LOSS A, B (SVC)
HLM unable to synchronize to Rx
signal.
Not receiving Service Channel frame
from coordinate Service Channel.
Check Modem alarms.
SYSTEM IS REBOOTING System is rebooting.
Do not unplug the SPU
Controller.
Do not reboot the SPU
Controller.
Do not download new software.
Do not switch software version.
T1 LOCAL CLK T1 CLK failure on M12 Unit. Replace the M12 Unit.
T2 SYNC LOSS
M12 Unit cannot frame up to
incoming signal.
Check High Level Mux alarms. If
okay, check far-end M12 Unit.
TRIB 1...4 OUTPUT FAIL
Output signal failure or signal level
below alarm threshold.
Check line termination. If okay,
replace M12 Unit.
TRIB LPBK (A1...A28,
B1...B16)
One or several T1 signals are looped
back toward the HLM.
Clear by Keypad command:
CONTROL > TRIB LOOPBACK >
TRIB LPBK > CLR.
TRIB LPBK BY REMOT
One or several T1 signals are looped
back toward the HLM. This signal
was sent by remote radio.
Clear loopback at remote site.
TRIB REMOTE LPBK
(A1...A28, B1...B16)
Coordinating one or several T1
signals are looped back toward the
HLM.
Clear by Keypad command:
CONTROL > TRIB REMOTE LPBK
> TRIB RMT LPBK > CLR.
TX-A, B, ATPC BOOST
Boost request from coordinating
Receiver.
Path or far-end Transmitter.
TX ABSENT (A1, A2 / B1,
B2)
Transmitter Assembly unplugged or
not installed per configuration.
Power Supply turned off or
defective.
Defective Transmitter Assembly.
Before plugging in the Tx, turn
off the Tx switch.
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 Tx Assy. You must
reset the output power. See
Chapter 11.
TX ENCODER
Modem FEC circuitry unlocked.
Possible cause: bad Modem.
Replace Modem. See
Chapter 11
.
TX LEVEL
IF signal output from the Modem is
3 dB low.
Replace Modem. See
Chapter 11
.
TX LOSS OF FRAME (HLM)
Loss of frame into HLM from
customer.
Check input signal.
TX TO HLM-1, 2 ALM
Tx signal from M12 Unit to HLM-1, 2
is not being received.
Replace the M12 Unit.
Message Explanation
Course of Action/Possible
Causes
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