SAGEM-LINK F 288055571-04
Installation and Operation Manual
Page 100/142
Issue 04 : July 2005
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power supply, or when the DC input voltage at ODU
input is too low
good, replace the ODU
ODU Cable
ODU Cable Alarm is generated by the ODU in case
of an transmit IF input level below the limit
Check IDU to ODU cable losses. If the
cable is good, replace Cable Interface
module, or the ODU.
Transmit Power
A transmit Power alarm is generated by the ODU in
case of a transmitter AGC loop fault, or in case of a
transmitter mute set by the operator (in 1+1 system
when both transmitters are in mute position).
Replace the ODU
Transmit
Frequency
This alarm is generated in case of IF or RF receive
synthesizer faults. When this alarm is active,
transmitter is also in mute position.
Replace the ODU
Receive
Frequency
This alarm is generated in case of IF or RF receive
synthesizer faults.
Replace the ODU
Receive Level
This alarm is generated when receive signal level is
below the receive threshold (default -70 dBm). This
alarm could be generated in case of a faulty remote
transmitter, a propagation problem, a bad antenna
alignment, or a faulty receiver..
Use other indications like remote
receiver receive level, and remote
terminal alarms to make a diagnostic
Tributary
Alarms
Description Corrective action
Trib Alarm
a tributary alarm is generated when there is a lack of
input signal for a tributary configured as "normal" (N),
or when there is a input signal for a tributary
configured as "inverted" (I).
check the corresponding cable, and
verify that external equipment is properly
connected. (see chapter 3 for more
details).
IDU Alarms Description Corrective action
Warning 1+1
A 1+1 warning is generated when main or standby
units (ODU or cable interface module) is not available
(alarm or absent). The system continues to work, but
it is not protected
Replace faulty units (cable interface
module or ODU)
ID Code
When local and remote ID Code do not match, there
is an ID Code alarm generated, and there is a AIS
emission on the receive data from the remote
terminal.
First verify that remote terminal ID code
corresponds to local terminal. If the alarm
is maintained, it means there is an other
link at the same frequency which causes
an interference. It should be necessary to
change transmit frequency or polarization
to avoid such interferences
IDU
This alarm is active in case of an IDU fault, or in case
of problem to recover receive data (same as Mux
LED in front panel).
Verify other parameters like receive
signal level, remote terminal alarms, path
obstructions, radio interferers.
BER Warning
This warning is generated when BER is greater than
the BER warning threshold (default 10
-6
).
Same as BER alarm
BER Alarm
This alarm is generated when BER is greater than
the BER alarm threshold (default 10
-3
). A BER alarm
can be generated by a poor receive level, or by an
other problem like a remote modulator fault or a radio
interferer
Many possible causes : propagation
problem (check RSL), Interferer
presence (make a frequency scan),
Power supply problem, remote
transmitter problem, receiver problem,
demodulator problem.
Local Aux In
Alarms
These four alarms represent local terminal input dry
loop status
External alarms
Remote Aux In
Alarms
These four alarms represent remote terminal input
dry loop status
External alarms
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