Symmetricom 1000 User Manual

Chapter 1 Overview of the TimeProvider

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.

For more information on connecting alarms, see 

page 70. For information on provisioning alarm levels, see 

The TimeProvider supports input and output SSMs. SSMs provide a method for 
providing clock quality information to any equipment that uses synchronization 
inputs. 

 describes the ANSI SSM values and the traceability associated 

with each value. 

 describes the ITU SSM values and the traceability 

associated with each value.

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

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