Meinberg C28COM - Manual (Page 17)

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Advanced Options
This menu may be used to change settings concerning the behaviour of the time
service. These options are described below.
Set time only if clock synchronous
If this option is active, the system time is adjusted only if the radio clock is synchroni-
zed by DCF77. If the clock enters the free running mode during operation, the system
time is not adjusted until C28COM is synchronous again.
As described in chapter „Overview C28COM“, this option should be active.
Synchronization radius
Once per second the time adjustment service calculates the difference between system
time and the reference time send by the radio clock. If the magnitude of this difference
is less than the value defined by this parameter, the system time will not be adjusted.
The „Synchronization radius“ is set to 300 msec per default. This results in a time
adjustment only if a difference of more than +/- 0,3 seconds is calculated.