Harris Constellation Installation And Maintenance Manual page 148

11-12
Message
RX LOSS OF FRAME
SIGNAL DEGRADED A, B
(TRAFFIC A, B)
(PATH A, B)
SVC ABSENT
SYNTH LOCK
(RX-A1, A2 / B1, B2)
SYNTH LOCK
(TX-A1, A2 / B1, B2)
SYNC LOSS A, B (HLM-1,
2)
SYNC LOSS A, B (SVC)
SYSTEM IS REBOOTING
T1 LOCAL CLK
T2 SYNC LOSS
TRIB 1...4 OUTPUT FAIL
TRIB LPBK (A1...A28,
B1...B16)
Constellation™
Explanation
Local loss of framing of incoming
signal.
Signal quality after equalization is
degraded. System RSL or BER may
be close to threshold.
Service Channel unplugged or
missing.
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.
HLM unable to synchronize to Rx
signal.
Not receiving Service Channel frame
from coordinate Service Channel.
System is rebooting.
T1 CLK failure on M12 Unit.
M12 Unit cannot frame up to
incoming signal.
Output signal failure or signal level
below alarm threshold.
One or several T1 signals are looped
back toward the HLM.
Course of Action/Possible
Causes
Fault may be in
The Receiver
The path
Far-end Transmitter
Far-end Modem
Near-end Modem (least likely).
Fault may be receive path or
far-end Transmitter.
Ensure that the Service Channel
is plugged into the backplane.
From the Keypad,
CONFIGURATION > SYSTEM >
SVC OPTION > INSTALL puts
the Service Channel into
service.
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.
Check Modem alarms.
Do not unplug the SPU
Controller.
Do not reboot the SPU
Controller.
Do not download new software.
Do not switch software version.
Replace the M12 Unit.
Check High Level Mux alarms. If
okay, check far-end M12 Unit.
Check line termination. If okay,
replace M12 Unit.
Clear by Keypad command:
CONTROL > TRIB LOOPBACK >
TRIB LPBK > CLR.
2002 June 20