ComStream CM601, Installation And Operation Manual

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8-4 Fault Handling, Troubleshooting, and Maintenance
The fault log, which is a historical record of CM601 fault conditions, can be
queried using the following commands:
Fault Log query (FL ?) — this remote command returns a decimal number
representing the bit-mapped fault log register. The decimal number must be
converted to binary, the binary 1s must be located, and, finally, the bit
locations of the binary 1s must be matched with the corresponding faults.
View Faults query (VF ?) — this remote command displays a complete card
listing that includes the name of the card, slot location, and descriptions of all
faults that have occurred since the faults were last cleared.
View Faults with Time Stamp query (VFT ?) — this remote command
displays a list of only the first 10 faults that occurred since the fault log
register was cleared. The list includes fault descriptions with date and time
stamps. The information is saved in volatile memory for subsequent viewing.
This feature is very helpful when tracking infrequent system problems,
especially those that occur at unmanned sites.
Fault Log — this front panel command displays the fault log. If there are no
fault conditions,
Modem FaultLog is Clear
is displayed. If there are
faults, they are displayed in a scrollable list.
Standard CM601 Faults
CM601 faults are listed in Table 8-1 by fault log register bit. Included for each
fault is the:
Fault log register bit
Weight
Displayed fault message
Type of fault, either:
Hardware (H) – caused by a circuitry failure in the CM601; usually
requires diagnosis and replacement of a faulty card
Operational (O) – indicates real or potential problem in the
communications path; requires search for an abnormal operating
condition and action as appropriate
Description of the fault
Possible causes of the fault