Q-Flex Satellite Modem Installation and Operating Handbook
11-7
11.4 Receive Warnings
Fault Text
Notes
Relays To Ter To Sat Other
Rx warning: Doppler buffer
max limited Rx data rate
above 42Mbps.
Buffer size should not exceed 80ms when data rate
exceeds 42Mbps
Rx warning: The minimum
period between buffer slips
is less than the user
threshold set for the
deferred alarm.
Buffer slips are occurring too frequently, this could
indicate that the clock accuracy is less than expected.
D
Rx warning: Rx exceeds
4.5Mbps limit in TPC 5/16.
Configuration error, data rate for FEC scheme exceeded.
Rx warning: Rx exceeds
6.5Mbps limit in TPC 21/44
or 2/3.
Configuration error, data rate for FEC scheme exceeded.
Rx warning: Rx exceeds
7.7Mbps limit in TPC 1/2.
Configuration error, data rate for FEC scheme exceeded.
Rx warning: Rx exceeds
12Mbps limit in TPC 7/8.
Configuration error, data rate for FEC scheme exceeded.
Rx warning: Rx exceeds
33Mbps limit in TCM 2/3.
Configuration error, data rate for FEC scheme exceeded.
Rx warning: Rx data rate
outside interface range.
Configuration error, data rate for terrestrial interface
exceeded.
Rx warning: The remote
Eb/No has fallen below the
user threshold.
D
Rx warning: The receive
Eb/No is worse than the
user threshold set for the
deferred alarm.
D
Rx warning: Rx symbol
rate outside range.
The modems current configuration exceeds the
permissible symbol rate, check the configuration.
Rx warning: Selected Rx
output clock has failed.
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.
D
Rx warning: Demodulator
FIFO overflowed.
This should not occur in normal operating circumstances.
Consult factory.
Rx warning: Maximum
multiframe period too
small.
Deframer failed to find a frame length to support TS ID
maintenance. Try reducing ESC baud rate or increasing
maximum multiframe period.