Digi TransPort WR11 User Manual page 717

Configuring system settings
3. Configure the NTP server parameters:
Initial Drift Compensation n ppm
NTP incorporates compensation for clock drift. If this parameter is known, it can be entered
here. Otherwise, the router calculates this value over a period of time. Once calculated, the
value is displayed in the text box.
Clock Precision Limit
Select the clock precision limit from the drop-down selection box.
Disable NTP when interface x,y is out of service
If the specified interface is out of service, the NTP is disabled until the interface is available
again.
NTP Servers 1 - 4
The router can have up to four NTP server connections. The more NTP servers deployed, the
more accurate the time setting will be. The following section describes the configuration of the
connections.
NTP Server 1/2/3/4-Hostname
The NTP server hostname or IP address.
Authorisation key #
The NTP authorization request key number. NTP allows for authenticating NTP requests and
responses with a key. These NTP requests include a key # field allowing the NTP server can
look up the appropriate key to use in performing the authorization.
Authorisation key
The key to associate with the configured authorization key number.
Broadcast Mode
When enabled, the NTP client operates in a different manner. Rather than sending out an NTP
client message and expecting a reply, the NTP module sends out a broadcast mode packet to
the IP address configured in NTP host field. The broadcast interval is determined by the value
of Minimum poll interval.
Poll Interval s1 to s2 seconds
The minimum and maximum intervals between poll broadcasts. The values are time, in
seconds, represented as a power of 2. This means that a value of 4 means that the minimum
poll interval is 2^4=16 seconds.
Startup burst Interval s seconds
When connecting to an NTP time server in polled mode, it may be necessary to send polls at
intervals shorter than the minimum poll interval, to speed up the synchronization process. This
parameter controls the interval between polls during the startup process. This feature is useful
in situations where the router only has an intermittent Internet connection.
Digi TransPort® Routers User Guide
Set system date and time
717