Symmetricom SDU-2000, User Manual

Page: 140 / 470

Clock Module Reference Data
Communications Module
140 SSU-2000 User’s Guide 12713020-002-2 Revision D – April 2004
Alarm Levels
The Communications module alarm logic incorporates three alarm levels:
CRITICAL Alarms – This class of alarms requires immediate user intervention.
When a critical alarm condition is detected, the CRITICAL ALARM relay at the
rear panel of the SSU-2000 is activated and the CRITICAL ALARM LED on the
front of the Communications module lights red.
MAJOR Alarms – A class of alarms that may require immediate user intervention.
When a major alarm condition is detected, the major alarm relay on the rear
panel of the SSU-2000 is activated and the MAJOR ALARM LED on the front of
the Communications module lights red.
MINOR Alarms – A class of alarms that indicate the unit performance is
degrading. The minor relay is activated and the MINOR ALARM indicator lights.
Alarms are elevated from MINOR to MAJOR to CRITICAL on a per module basis
with a user-set time, from 60 to 500,000 seconds, default is (86,400 seconds or one
day). The elevation time is kept in each module.
The user can select delay periods for software alarms from 0 to 86400 seconds.
Changing the delay period generates an event. The setting is stored in each
module. Note: if the original value is set to IMMED (–1), it means this error delay is
not allowed to change and will happen immediately.
Table 6-8 lists the Communications module alarms.
EIA-232 Ports
The Communications module implements four EIA-232 ports that provide for local
and remote communications with the SSU-2000.
A user interface (software resident in the Communications module) provides various
levels of password-protected access for configuration and detailed performance
monitoring and diagnostics. Use either the interactive command set or the TL1 user
interface for configuring and detailed performance monitoring, see
Appendix B,
Communications Protocol .
Table 6-8. Communications Module Alarms
ID Description
Alarm
Level
Error Delay
Default
Error Delay
Settable?
0x0 Backplane Communication Errors MINOR 5 sec Yes
0x1 Mastership Problems MINOR 5 sec Yes
0x2 Loss of Power A MINOR Immed No
0x3 Loss of Power B MINOR Immed No
0x4 SPI Watchdog Timeout MAJOR Immed No