Digi TransPort WR11, User Manual

Page: 649 / 866

Configure system settings NTP parameters
Digi TransPort WR Routers User Guide 649
NTP parameters
Use NTP for greater accuracy
Enabling this setting expands the page to show the NTP settings, described below. NTP is much
more accurate than SNTP, with NTP an accuracy of 200 microseconds (1/5000 second) can be
achieved. The NTP functionality is in accordance with RFC1305. You can configure up to 4
remote peers. All the peers are polled at intervals, and the best peer is selected for using as the
time source. Configure SNTP before using NTP. The router calculates the accuracy of the NTP
time servers over a period of time, up to 2 hours. Once the drift compensation is calculated, the
router uses NTP client. The drift compensation value is stored in NVRAM and written to the
config.da0 file. If the router loses power or is rebooted, it does not need to re-calculate the
accuracy of the NTP servers again. The compensation value is constantly monitored to make
sure it remains correct.
Note Using SNTP achieves an accuracy of around 1 second. Using NTP achieves an accuracy of
200 microsecond. Not all models support NTP; this option only appears for models that do.