Getting the Time from Local NTP Time Sources
Run the DTS server on a node that is running an NTP clock driver with a clock and the null time-provider. Specify the inaccuracy in a manner that is consistent with the time source; for instance, a radio clock. Other DTS servers will take the time from this source. In this case, since the system is connected to a time source, it is an NTP Stratum 1 server.
Observe the rules and advisories that follow:
· Rule - If this is the only local time source (radio clock) in the subnetwork, ensure that no other DTS node gives the time to NTP. If, however, there are other local time sources, this restriction does not apply.
· Rule - Do not run the null time-provider if there is no local time source.
· Advisory - Use a very small poll rate, about 1 second.
· Advisory - Since NTP makes the adjtime( ) system call, be aware that the local node will occasionally have an unspecified inaccuracy.
The following figure shows how a DTS server/client with a local time source takes time from an NTP Stratum 1 server.
Local Time Source
