Symmetricom TimeHub 5500 User Manual

208 TimeHub 5500 User’s Guide 097-55501-01 Revision M – January 2009
Chapter 5 Maintaining the TimeHub 5500
Clearing Output Port Alarms
Figure 5-1. The Configuration Output Screen
Figure 5-2. Attempt to Clear Port Alarm Query Screen
Note: The screen identifies that the C card group is the target for
clearing. Click OK to proceed with the attempt to clear the alarm.
Note: If a false port alarm does not self-clear after the condition
causing it is removed, the false alarm was likely generated on only one
output card in a redundant pair. This could occur since each card
independently senses port alarms and could be impacted slightly
differently by injected noise. For example, one card has its sense line
near but slightly below the alarm threshold (hence no alarm) and the
other card has its sense line near but slightly above the alarm threshold
(hence it alarms). When only one card alarms (in a situation where
there is a good standby) it effectively remains latched in the alarm state
because it disables itself and is no longer able to test for port alarms.

Symmetricom TimeHub 5500 Specifications

General

Brand	Symmetricom
Model	TimeHub 5500
Category	Data Loggers
Language	English