Symmetricom SSU-2000e User Manual page 30

Chapter 1 Product Overview
System Architecture
Ignore Mode
IGNORE means that appropriate information on the event is transmitted on all of the
communications ports when the event occurs, and on demand, but no alarm is
generated. For example, the status of the SSM at each input port and at the output
ports is reported when it changes and when the user sends an inquiry but no alarm
is generated.
Report Mode
The REPORT mode option is used to report alarm indications only.
An ALARM command is available in the SSU-2000e firmware that allows a user to
view the current status of alarm indications on the unit and set alarm delay intervals
and activation levels. Only active alarm indications are displayed unless an option is
specified.
The DELAY option sets the length of time in seconds an alarm must be active
before generating a hardware indication. This option also allows the user to set the
level of any alarms:
IGNORE – ignore any alarm indication
REPORT – report only alarm indications
MINOR – sets alarm level to MINOR
MAJOR – sets alarm level to MAJOR
CRITICAL – sets alarm level to CRITICAL
See the SSU-2000e Technical Reference for details on the DELAY option.
Alarm Mode
The user sets the alarm to one of three levels of alarm severity: MINOR, MAJOR or
CRITICAL. In general, events that are classified as ALARMS are those for which
user or Craft intervention is required. MINOR and MAJOR alarms can be elevated
automatically to the next higher level after a user-settable time period.
For Input Ports to be disqualified as possible system references, the alarm level
must be Major (it can elevate from a Minor) or Critical. Additionally, the system can
select a redundant component when the currently selected module/component
indicates a Major or Critical Alarm, for example a Clock Module Alarm set to Major
allows the system to select the Secondary Clock Module.
The unit is capable of generating reports to include: local oscillator being switched,
log in/out, restart, board removed/inserted, events cleared, PLL loop control, user
image clear/set, phase samples, frequency control, and a keep-alive output every 5
minutes. See the SSU-2000e Technical Reference for information on commands.
30 SSU-2000e User's Guide 12713140-002-2 Revision E – October 2006