ComStream CM601, Инструкция по установке и эксплуатации

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Fault Handling, Troubleshooting, and Maintenance 8-7
20 524288 Relay
Monitor
Pin 4 H Fault reported by fault sense
signals on the rear panel
status relay connector The CM601 monitors status relay pins and reports a
fault as defined by the FRX command.
21 1048576 — — Not used —
22 2097152 — — Not used —
23 4194304
Loss of
Doppler
Output Clock
O Doppler buffer fault The clock selected for clocking out of the buffer is
not present or out of range.
24 8388608
Relay
Monitor
Pin 5
H Fault reported by fault sense
signals on the rear panel
status relay connector The CM601 monitors status relay pins and reports a
fault as defined by the FRX command.
25 16777216 (Narrow option Tx
summary fault) H or O Card-specific message. Review the option card fault messages.
26 33554432
BERT Sync
Loss
(Narrow option Rx
summary fault)
H or O Internal BERT lost data
synchronization
The demodulator is not in sync and is not passing
valid data to the BERT.
Card-specific messages may also be associated
with this fault bit.
27 67108864 (Narrow option Tx
hardware fault) H Card-specific message. Review the option card fault messages.
28 134217728 (Narrow option Rx
hardware fault) H Card-specific message. Review the option card fault messages.
29 268435456
Tx FIFO Full
Fault
O Data buffer on the modulator
has overflowed or
underflowed Occurs briefly when changing modulator data rates
or timing (MB). In addition, if the modulator is
running external timing and the user-provided clock
(TT) does not match the clock expected by the
modulator (TD), this fault may occur. Excessive jitter
coming from DTE.
(Wide option Tx
summary fault) H or O — Card-specific messages may also be associated
with this fault bit.
30 536870912
Low Eb/No
O Demodulator E
b
/N
0
level has
dropped below the user-
specified threshold (EBT)
There has been a decrease in input power level,
probably due to a rain fade.
Output
Buffer Fault
H or O Data buffer on the
demodulator has overflowed
or underflowed
Occurs briefly during operation, for example, when
changing demodulator data rate.
If this fault is reported constantly, there is a
hardware problem in the demodulator.
(Wide option Rx
summary fault) H or O — Card-specific messages may also be associated
with this fault bit.
31 1073741824 (Wide option Tx
hardware fault) H Card-specific message. Review the option card fault messages.
32 2147483648 (Wide option Rx
hardware fault) H Card-specific message. Review the option card fault messages.
Table 8-1 CM601 Faults (continued)
Bit Weight* Fault Type Description Possible Cause
* Weight = (2
bit-1
)