Constellation™ 2002 June 20
11-12
RX LOSS OF FRAME Local loss of framing of incoming
signal.
Fault may be in
The Receiver
The path
Far-end Transmitter
Far-end Modem
Near-end Modem (least likely).
SIGNAL DEGRADED A, B
(TRAFFIC A, B)
(PATH A, B)
Signal quality after equalization is
degraded. System RSL or BER may
be close to threshold.
Fault may be receive path or
far-end Transmitter.
SVC ABSENT Service Channel unplugged or
missing.
Ensure that the Service Channel
is plugged into the backplane.
From the Keypad,
CONFIGURATION > SYSTEM >
SVC OPTION > INSTALL puts
the Service Channel into
service.
SYNTH LOCK
(RX-A1, A2 / B1, B2)
SYNTH LOCK
(TX-A1, A2 / B1, B2)
2 GHz synthesizer in the Receiver
Assembly is out of lock. Frequency
is different from the assigned
frequency.
2 GHz synthesizer in the
Transmitter Assembly is out of lock.
Frequency is different from the
assigned frequency.
You must enter exactly 7 digits
for the frequency, but for 11
GHz systems, you must enter 8
digits. If the frequency is set
correctly, either the Rx or the
PS may be faulty.
You must enter exactly 7 digits
for the frequency, but for 11
GHz systems, you must enter 8
digits. If the frequency is set
correctly, either the Tx or the PS
may be faulty.
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.
Message Explanation
Course of Action/Possible
Causes
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