A Appendix: VB220 Versus VBC Alarms
The VB220 Probe alarms are independent of the VideoBRIDGE Controller alarms. The Probe has been
designed to yield instantaneous alarms based on the current measurements. This typically results in lots
of short-lived alarms that would be “too much” for the VBC to report, as the VBC may control a large
number of Probes. The VBC therefore generates alarms based on error-second statistics gathered from
Probes during a selectable time period (default 60 minutes – sliding window).
This means that comparing the probe alarm list and the VBC alarm list is not very meaningful.
Ethernet measurement data are sent from the Probe together with Ethernet error-second threshold
values (as set in the Probe
Setup — VBC thresh.
view). The VBC monitors the error seconds for each
parameter and will raise an alarm provided that the error-seconds figure exceeds the threshold value, as
monitored during the windowing period.
Probe
VBC
VBC
Thresholds
VBC
Alarm
Settings
VBC
Alarms
ETH Multicast
ETH Measurements
Figure A.1: VBC alarming based on Probe measurements
252 VB2xx GigE User’s Manual version 5.4
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