Spectracom SecureSync 1200 User Reference Manual page 474

APPENDIX
2.
The Gb PTP Edit window will display. It includes the top panel , and offers access to three
different tabs , described below:
458
Note: If you have only one input or output of any type, SecureSync will
number that input or output 0. Additional inputs or outputs will be
numbered 1 or above.
SecureSync User Reference Guide