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B-6 APPENDIX B: REMOTE MONITORING (RMON) TECHNOLOGY
When you disable a port, the application might not update some of the
statistics counters associated with it.
An alarm calculates the difference in counter values over a set time interval
and remembers the high and low values. When the value of a counter
exceeds a preset threshold, the alarm reports this occurrence.
You can assign alarms with Transcend Enterprise Manager or any other
SNMP network management application to monitor any counter, gauge,
timetick, or integer. Consult the documentation for your management
application for details on setting up alarms.
Setting Alarm Thresholds
Thresholds determine when an alarm reports that a counter has exceeded a
certain value. You can set alarm thresholds through the network manually,
and choose any value for them that is appropriate for your application. The
network management software monitors the counters and thresholds
continually during normal operations to provide data for later calibration.
Example of an Alarm Threshold
Figure B-1 shows a counter with thresholds set manually.
Figure B-1 Manually Set Thresholds
Time
Counter
Manually set high threshold
(user-specified)
Manually set low threshold
(user-specified)