Constellation™ November 2003
10-12 Troubleshooting Guidelines
RX ABSENT (A1, A2 / B1,
B2)
Receiver Assembly unplugged or not
installed per configuration.
Power Supply turned off.
Defective Receiver Assembly.
Ensure that the Receiver
Assembly is plugged into the
backplane.
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 Receiver Assembly.
See Chapter 11.
RX DECODER Modem decoder is in alarm state.
Fault may be in
The Receiver
The path
Far-end Transmitter
Far-end Modem
Near-end Modem (least likely).
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.
Message Explanation
Course of Action/Possible
Causes
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