Input Frametypes: Ssm-States And Ssm-Values - Symmetricom TimeProvider 5000 User Manual

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
Selected
Input SSM State
Signal
1544kHz
D4
ESF
Enable
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.
Note:
reference while clock was in normal lock state.
098-00028-000 Revision F – May, 2012
PQL value
Disable User-value
Enable
Disable User-value
Enable
Disable User-value
with valid SSM Input SSM
with no SSM
with unsupported
SSM code
with STU code
with DUS code
SSM during bridging will be the last SSM value of input
Provisioning the Programmable E1/T1 Inputs
Current Disqualify Signal
Based on SSM?
Allow
15 Disqualify
Allow
15 Disqualify
Allow
Allow
15 Disqualify
15 Disqualify
2 (STU) Allow
9 (DUS) Disqualify
TimeProvider 5000 User's Guide 319
Chapter 4 Provisioning
Output
PQL value
User-value
OSC (holdover)
User-value
OSC (holdover)
User-value
Input SSM
OSC (holdover)
OSC (holdover)
2 (STU)
OSC (holdover)