Symmetricom 1000, 1100 manual Alarms, Synchronization Status Messages SSMs

Chapter 1 Overview of the TimeProvider

Alarms

Alarms

The TimeProvider uses alarms to notify you when certain conditions are deteriorating below user-specified levels. These alarms are indicated by shelf and card status lamps (LEDs) and by TL1 messages reported over the serial/EIA-232 or LAN communication ports. In addition, the input panel has a connector that provides contact closures to activate external alarms.

You can provision the alarm level for most alarms to one of the following levels: non-reportable (NR), non-alarm event (NA), minor (MN), major (MJ), or critical (CR). Alarms related to the inputs are special cases; you can only provision input alarms for minor, major, or critical. To help prevent spurious or transient input alarms, a delay timer (FLTDELAY) allows you to provision a waiting period that starts after the alarm condition occurs; the alarm is set at the end of the period. A similar timer (CLRDELAY) clears the alarm after the alarm condition is no longer present.

Recommendation: To prevent Non-Service Affecting LOS alarms, Symmetricom recommends that you provision unused inputs to the Disabled state.

For more information on connecting alarms, see Making Alarm Connections, on page 70. For information on provisioning alarm levels, see Provisioning the Alarm Levels, on page 126.

Synchronization Status Messages (SSMs)

The TimeProvider supports input and output SSMs. SSMs provide a method for providing clock quality information to any equipment that uses synchronization inputs. Table 1-4describes the ANSI SSM values and the traceability associated with each value. Table 1-5describes the ITU SSM values and the traceability associated with each value.

Table 1-4. ANSI SSM Quality Level Definitions

Description	Quality Level	Abbreviation
Stratum 1 Traceable	1	PRS
Synchronized – traceability unknown	2	STU UNK
Stratum 2 traceable	3	ST2 TYPE II
Transit Node traceable	4	TNC TYPE V
Stratum 3E traceable	5	ST3E TYPE III
Stratum 3 traceable	6	ST3 TYPE IV

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