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invalid once VersaSync is reset, or power- cycles, or after the Holdover Time expires

(whichever occurs first). It then needs to be set manually and submitted again (Edit Sys-

tem Time > Manual Time Set).

The only workaround for this is "Using Battery Backed Time on Startup" on page143.

This will allow VersaSync to apply the User/User reference after a power-cycle without

manual intervention.

How to setup the User/User Reference

See "Manually Setting the Time" on page141.

Using the "User" Reference with Other References

If the User/User reference is used in conjunction with other, external references (such as

GNSS or IRIG), the System Time should be set as accurately as possible:

Otherwise, the large time correction that needs to be bridged when switching from a lost

reference to a valid reference, or from a valid reference to a higher-priority reference that

has become available again, will cause NTP to exit synchronization. If the difference is

under 1second, NTP will remain in sync and will "slew" (over a period of time) to the new

reference time.

3.3.1.4 Reference Priorities: EXAMPLES

Example 1 – GNSS as primary reference, IRIG as backup:

In this use case, the objective is to use:

GNSS as the primary Time, and 1PPS reference

IRIG as the backup Time, and 1PPS reference.

Step-by-step procedure:

Move the reference which has “GPS 0” in the Time column and “GPS 0” in the

1PPS column to the top of the table, with a Priority value of 1. Click the Enabled

checkbox.

Move the reference which has “GPS 0” in the Time column and “GPS 0” in the

1PPS column to the top of the table, with a Priority value of 1. Click the Enabled

checkbox.

Move the reference which has “GPS 0” in the Time column and “GPS 0” in the

1PPS column to the top of the table, with a Priority value of 1. Click the Enabled

checkbox.

160

CHAPTER 3 • VersaSync User Manual Rev. 7.0

3.3 Managing References

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