E x a m p l e 2 :
To create a Local Clock for a VersaSync installed in the Eastern Time Zone of the US, and desiring the
Local Clock to automatically adjust for DST (using the post 2006 DST rules for the US).
1. In the MANAGEMENT > Time Management: Local Clocks > (+): Local Clock window:
2. Navigate to MANAGEMENT > Time Management: Local Clocks > (+): Local Clock.
3. From the UTC Offset pull-down menu, select “UTC -05:00”.
4. Select the Use DST Rules checkbox.
5. Select the Set DST Rules by Region checkbox.
6. From the DST Region drop-down list, select “US-Canada.”
7. Review the changes made and click the Submit button.
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://www.worldtimeserver.com/,
http://webexhibits.org/daylightsaving/b.html.
3.3 Managing References
3.3.1 Input Reference Priorities
VersaSync 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 VersaSync unit via
dedicated (mostly optional) inputs. It is also possible to enter a system time manually, which Ver-
saSync then can synchronize to.
In order for VersaSync 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 VersaSync to gracefully fall back upon a lower ranking 1PPS or Time reference without
3.3 Managing References
CHAPTER 3 • VersaSync User Manual Rev. 6.0
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