Signature Control - Spectracom SecureSync User Reference Manual

3.6.13

Signature Control

Signature Control is a user-set parameter that controls when a SecureSync output (for example,
1PPS, or IRIG) will be present. This feature allows you to determine how closely you want to link
an output to its input. This not only allows you to determine the quality of your output signal (e.g.,
by deactivating it, when the holdover period expires), but also offers the capability to indirectly
send an input-reference-lost alarm to a downstream recipient via the presence of the signal.
E X A M P L E S :
If you so wish, you can set signature control up such that SecureSync's built in 1PPS output
goes away the moment its input reference is lost (e.g., if a valid GNSS signal is lost). Or, you can
maintain your output signal while SecureSync is in holdover mode, but not in free run.
The signature-control drop-down list with its four different signature states can be found by clicking
the GEAR button for any output. The available options are:
I.
II.
III.
IV.
Ref.
I.
II.
III.
IV.
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3 SecureSync User Reference Guide Rev. 18
Output Always Enabled —The output is present, even if SecureSync is not synchronized to
its references (SecureSync is free running).
Output Enabled in Holdover —The output is present unless SecureSync is not syn-
chronized to its references (SecureSync is in Holdover mode).
Output Disabled in Holdover —The 1PPS output is present unless the SecureSync ref-
erences are considered not qualified and invalid (the output is NOT present while
SecureSync is in Holdover mode.)
Output Always Disabled —The output is never present, even if SecureSync references are
present and valid.
Out-of-sync, no holdover In holdover In-sync with external reference
3.6 OTHER Setup Pages
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