Symmetricom SSU-2000 User Manual page 164

Chapter 7 Input Module Reference Data
1-Port and 3-Port E1 Input Modules
Table 7-1. E1 Input Module Alarm Modes (Continued)
Alarm Mode
MAJOR Generate event message
CRITICAL Generate event message
Fault Port
Alarms Caused by Hardware Problems
The following alarms are generated due to hardware problems:
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 said to be in episode. Refer
to Changing Factory
count.
164 SSU-2000 User's Guide
Action
Elevate to Critical if the alarm condition persists
beyond the user-set elevation time limit
Cannot be elevated to a higher severity level
Defaults, on page 114, for more information on setting the error
Alarm Elevation
12713020-002-2 Revision F.01 – January 2007