Dst And Utc, Gmt; Managing References; Input Reference Priorities - Spectracom PRISMA VelaSync User Manual

1. In the
2. Navigate to
3. From the
4. Select the
5. Select the
6. From the
7. Review the changes made and click the
The unit will display the status of the change.
3.2.4.3 DST and UTC, GMT
Neither UTC, nor GMT ever change to Daylight Savings Time (DST). However, some of the
countries that use GMT switch to a different time zone offset during their DST period. The
United Kingdom is not on GMT all year, but uses British Summer Time (BST), which is one hour
ahead of GMT, during the summer months.
Additional information about regional time zones and DST can be found on the following web
sites:
http://webexhibits.org/daylightsaving/b.html
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
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 manually, which
VelaSync then can synchronize to.
In order for VelaSync to declare synchronization, it needs both a valid 1PPS , and Time ref-
erence.
The concept of Reference Priority allows the ranking of multiple references for redundancy. This
allows VelaSync to gracefully fall back upon a lower ranking 1PPS or Time reference 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 reli-
ability.
CHAPTER •
3 VelaSync User's Manual Rev. 1
MANAGEMENT > Time Management: Local Clocks > (+): Local Clock
MANAGEMENT > Time Management: Local Clocks > (+): Local Clock
UTC Offset
pull-down menu, select "UTC -05:00".
Use DST Rules
checkbox.
Set DST Rules by Region
DST Region
drop-down list, select "US-Canada."
http://www.worldtimeserver.com/
, or just References
checkbox.
Submit
button.
,
.
.
3.3 Managing References
window:
.
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