3.3
Managing References
3.3.1
Input Reference Priorities
VelaSync can be synchronized to different time and frequency sources that are
referred to as
Input References
, or just
References
.
References can be a GNSS receiver, or other sources delivered into your VelaSync unit
via dedicated (mostly optional) inputs. It is also possible to enter a system time manu-
ally, which VelaSync then can synchronize to.
In order for VelaSync to declare synchronization, it needs both a valid
1PPS
, and
Time
reference.
The concept of
Reference Priority
allows the ranking of multiple references for redund-
ancy. This allows VelaSync to gracefully fall back upon a lower ranking
1PPS
or
Time
ref-
erence without transitioning into Holdover, in case a reference becomes unavailable or
invalid. The priority order you assign to your available references typically is a function of
their accuracy and reliability.
Note:
The References shown on your screen may look different from
the ones in the illustration below, depending on your VelaSync High-
Speed Enterprise Time Server model and hardware configuration.
Each available type of
Time
and
1PPS
input reference is assigned a human-readable
name or “title” that is used in the
Reference Priority
table, indicating the type of ref-
erence. The reference titles are listed in the following table:
3.3 Managing References
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