Spectracom SecureSync User Reference Manual page 323

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 frequency
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.
5.2.3.8 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 the Configuration of an Input or Output" on
page 288.
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 Status window displays the following settings:
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5 SecureSync User Reference Guide Rev. 18
the frequency reference is intended to operate as a backup reference to a different
primary reference source.
Frequency : Used to configure the frequency (in Hertz) of the input signal. The available Fre-
quency range is 1KHz...10 MHz in 1Hz steps.
NOTE – SecureSync starts numbering I/O ports with 0 (only 1PPS and 10 MHz out-
puts start at 1, because of the built-in outputs).
Reference ID : Name used to represent this 1PPS input reference in the Reference Priority
table; see "Configuring Input Reference Priorities" on page 153 for more information on ref-
erence priorities.
1PPS Validity : Indicates "OK" (green) if the 1PPS input signal is present and valid. Indic-
ates "Not Valid" (orange) if the 1PPS input signal is either not present or is not considered
valid.
5.2 Time and Frequency Option Cards
307