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QMultiFlex-400™ Installation and Operating Handbook
11.4 Receive Warnings
Fault Text
Rx warning: Rx data rate
outside interface range.
Rx warning: The remote
Eb/No has fallen below the
user threshold.
Rx warning: The receive
Eb/No is worse than the
user threshold set for the
deferred alarm.
Rx warning: Rx symbol
rate outside range.
Rx warning: Selected Rx
output clock has failed.
Rx warning: Demodulator
FIFO overflowed.
Rx warning: Backward
alarm at Insert MUX,
indicating equipment
downstream of Rx has
failed.
Rx warning: Wanted Rx
input power out of range.
Rx warning: Composite Rx
input power out of range.
Rx warning: Composite to
wanted power level ratio
>37dBc.
Notes
Configuration error, data rate for terrestrial interface
exceeded.
The modems current configuration exceeds the
permissible symbol rate, check the configuration.
The clock selected as the Receive data output clock has
failed. The modem has switched to using a backup clock
generated by the Rx PLL to preserve the receive traffic.
This fault can only occur if the source is the same
frequency as the Rx data rate (otherwise the clock is not
used directly but is instead rate converted by the Rx PLL
and would result in a different failure). Check which
signal the PLL uses as a backup clock.
This should not occur in normal operating circumstances.
Consult factory.
This will only be displayed if the modem if fitted with an
interface that provides four ports for separate input and
output of separate Tx/Drop and Rx/Insert PCM bearers. It
indicates a backward alarm has been detected at the Rx
bearer input. This indicates that equipment downstream
of the receive path has failed and is returning an alarm.
This may be due to any receive downstream equipment
but could be due to the modem Rx output failing. Check
the modem Rx path indicates OK and that the Rx data
output from the modem is connected to the downstream
equipment.
Indicates that the wanted signal is very low or very high.
Indicates very high level of composite power.
Indicates very high level of composite-to-wanted power.
11-3
To
To
Relays
Other
Ter
Sat
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