Symmetricom SSU-2000 User Manual page 365

Note: Input reference selection order proceeds from highest (1) to
lowest (16) PQL valid input port. If the inputs have equal PQL values,
then the priority is used to distinguish between them.
Level 4
Remarks
Related
Restrictions None
Example:
SSU_2000->ref
2001-06-18T21:29:56Z ID: SSU2000 Name: SSU_2000
Input Reference:
Bypass Clock C Selected:
Clock Selected:
12713020-002-2 Revision D – April 2004
Sets the PQL value as the input selection mode
PQL
Same as Level 3 operation
None
INPUT, CLK, STATUS
1A03-01
1A04-01
1A01
Interactive Command Set
SSU-2000 User's Guide 365