Input Reference Priorities - Spectracom SecureSync User Reference Manual

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3.6.5

Input Reference Priorities

SecureSync can be synchronized to different time and frequency sources that are referred to as
Input References
References can be GNSS receivers, or other sources such as IRIG, ASCII or HAVE QUICK time
codes delivered into your SecureSync unit via dedicated (mostly optional) inputs. It is even pos-
sible for the user to enter a system time manually, which SecureSync then will synchronize to.
In order for SecureSync to declare synchronization, it needs both a valid PPS , and Time reference.
The concept of Reference Priority allows the ranking of multiple references for redundancy. This
allows SecureSync to gracefully fall back upon a lower ranking PPS or Time reference, in case a
source with a higher priority becomes unavailable or invalid. The priority order you assign to your
available references typically is a function of their accuracy and reliability.
Each available type of Time and PPS input reference is assigned a "title" to be used in the Refer-
ence Priority table. The title defines the type of reference it is (e.g., "GPS 0" indicates GNSS
input). These reference titles are defined in following table:
ASCII Timecode
External 1PPS input
Frequency
GPS
PTP
IRIG
148
or, sometimes just References
NOTE – Should you be installing new option cards, you will need to either manually
set up the new card in the Reference Priority Table, or use the Reset to Defaults
option in the Actions panel in order to update the table with the new reference inform-
ation.
Title
ASCII serial timecode input
External 1PPS input
External Frequency input
GNSS input
PTP input
IRIG timecode input
.
Reference
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