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Quantum and Evolution Series Installation and Operating Handbook
12.4 Receive Warnings
Fault Text
Rx warning: Doppler buffer
Buffer size should not exceed 80ms when data rate
max limited Rx data rate
exceeds 42Mbps
above 42Mbps.
Rx warning: The minimum
period between buffer slips
Buffer slips are occurring too frequently, this could
is less than the user
indicate that the clock accuracy is less than expected.
threshold set for the
deferred alarm.
Rx warning: Rx exceeds
Configuration error, data rate for FEC scheme exceeded.
4.5Mbps limit in TPC 5/16.
Rx warning: Rx exceeds
6.5Mbps limit in TPC 21/44
Configuration error, data rate for FEC scheme exceeded.
or 2/3.
Rx warning: Rx exceeds
Configuration error, data rate for FEC scheme exceeded.
7.7Mbps limit in TPC 1/2.
Rx warning: Rx exceeds
Configuration error, data rate for FEC scheme exceeded.
12Mbps limit in TPC 7/8.
Rx warning: Rx exceeds
Configuration error, data rate for FEC scheme exceeded.
33Mbps limit in TCM 2/3.
Rx warning: Rx data rate
Configuration error, data rate for terrestrial interface
outside interface range.
exceeded.
Rx warning: The distant
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
The modems current configuration exceeds the
rate outside range.
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.
Rx warning: Selected Rx
This fault can only occur if the source is the same
output clock has failed.
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.
Rx warning: Demodulator
This should not occur in normal operating circumstances.
FIFO overflowed.
Consult factory.
Rx warning: Maximum
Deframer failed to find a frame length to support TS ID
multiframe period too
maintenance. Try reducing ESC baud rate or increasing
small.
maximum multiframe period.
Rx warning: Rx Channel
Consult technical support if this alarm cannot be cleared.
DPLL Unlocked.
Notes
12-5
Relays To Ter To Sat
Other
D
D
D
D
D
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