Symmetricom TimeProvider 5000 User Manual

098-00028-000 Revision F – May, 2012 TimeProvider 5000 User’s Guide 319
Chapter 4 Provisioning
Provisioning the Programmable E1/T1 Inputs
 If input SSM for a port has a worse quality level than the IOC oscillator - Type II
for Rb IOC and Type 1 for Quartz IOC -the input port will be disqualified
 If SSM is enabled for an input port and the signal does not support SSM or is not
sending a valid SSM, then the input will be disqualified. The SSM-value for the
input will be set to 15 (invalid). If there is not another qualified reference to switch
to, the system will go to holdover.
 If any of the following conditions are detected at an input port, that input signal
will be disqualified: Loss of signal (LOS), Out-of-framing (OOF), or Alarm
indication signal (AIS)
Table 4-16 illustrates some example situations. The Output PQL values shown
assume that no other references are available
Table 4-16. Input Frametypes: SSM-States and SSM-values
PQL-Value
The “PQL value” parameter that is used with the “set input” command corresponds
to the Priority Quality Level (PQL) values for reference input signal types, as shown
in Table 4-17. The PQL is a representation of traceability for the signal presented at
the input ports, where a PQL value of 15 represents an invalid SSM. If SSM is
disabled for an input port, then the TP5000 will use the user-assigned PQL value for
that input port.
Selected
Input
Signal
SSM State
Current
PQL value
Disqualify Signal
Based on SSM?
Output
PQL value
1544kHz Disable User-value Allow User-value
Enable 15 Disqualify OSC (holdover)
D4 Disable User-value Allow User-value
Enable 15 Disqualify OSC (holdover)
ESF Disable User-value Allow User-value
Enable with valid SSM Input SSM Allow Input SSM
with no SSM 15 Disqualify OSC (holdover)
with unsupported
SSM code
15 Disqualify OSC (holdover)
with STU code 2 (STU) Allow 2 (STU)
with DUS code 9 (DUS) Disqualify OSC (holdover)
Note: SSM during bridging will be the last SSM value of input
reference while clock was in normal lock state.

Symmetricom TimeProvider 5000 Specifications

General

Brand	Symmetricom
Model	TimeProvider 5000
Category	Server
Language	English