Spectracom SecureSync 1200 User Reference Manual page 380

APPENDIX
The Web UI list entries for these cards are: 1PPS/Frequency BNC and 1PPS/Frequency RS-
485. The connector number is: J1 (BNC card); J1 (RS-485 card).
The Edit window allows the configuration of the following settings:
Reference Mode : Used to control how the reference mode operates in determining its
validity. Values are:
Frequency : Used to configure the frequency (in Hertz) of the input signal. The available
Frequency range is 1KHz...10 MHz in 1Hz steps.
The input frequency is measured versus internal frequency and compared to the setup value. If
the discrepancy is larger than 1kHz, the input is disqualified and not considered valid. The fre
quency reference does not inherently provide an on-time point, so it relies on the current on-
time point of the system prior to its taking over for synchronization.
Frequency Input: Status Window
To view the current settings of the Frequency Input (also referred to as 'Reference'), go to its
Status window. For instructions, see: "Viewing Input/Output Configuration Settings" on
page 329.
364
SecureSync starts numbering I/O ports with 0 (only 1PPS and 10 MHz out
Note:
puts start at 1, because of the built-in outputs).
Primary Reference —Allows the frequency reference to be valid based solely on
its own presence.
Secondary Reference —Requires another valid reference to synchronize the sys
tem before the frequency reference can be determined to be valid. This is used
when the frequency reference is intended to operate as a backup reference to a
different primary reference source.
SecureSync User Reference Guide