Symmetricom SSU-2000e User Manual page 168

Chapter 7 Input Module Reference Data
1-Port and 3-Port E1 Input Modules
Alarms Caused by Hardware Problems
The following alarms are generated due to hardware problems occur:
External Clock Signal PLL Unlocked
– Report event message and perform any other actions as required by the
user-set severity level
– Fault channel, even if severity is less than MAJOR
– Monitor PLL for recovery
Input Signal PLL Unlocked
– Report event message and perform other actions as required by severity
– Fault port, regardless of severity
– Monitor PLL for recovery
Phase Measurement Circuitry Fault
– Report event message and perform any other required actions
– Fault Port
– Monitor phase hardware for recovery
Alarms Caused by Faulty Input Signals
The following alarms are caused by problems with the incoming input signal's
formatting or content:
Errors Tracked:
– Framed signals: LOS, AIS, OOF, BPV and CRC
– Unframed signals: LOS
Error and Clear Counters
The E1 Input module maintains a count of the number of consecutive errored
seconds for each error type for each port. Once this error count exceeds a user-set
limit, the input signal which has experienced the errors is said to be in episode.
Refer to Changing Factory
the error count.
The Input module maintains a count of the number of consecutive seconds in which
the input signal for each port was free of each type of error. This clear count must
exceed a user-set limit before the input signal is no longer in episode. Refer to
Changing Factory
count.
168 SSU-2000e User's Guide
Defaults, on page 113, for more information on setting
Defaults, on page 113, for more information on setting the clear
12713140-002-2 Revision E – October 2006