Westermo MR Series - Manual (Page 244)

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Web Interface and Command Line Reference Guide www.westermo.com
Confi gure > NTP 4.82
NTP is much more accurate than SNTP, with NTP an accuracy of 200 microseconds (1/5000 sec-
ond) can be achieved. The NTP functionality is in accordance with RFC1305.
Up to 4 remote peers can be configured, all the peers are polled at intervals and the “best” peer is
selected for using as the time source.
SNTP should be configured prior to using NTP. The router will calculate the accuracy of the NTP
time servers over a period of time, once the drift compensation is calculated the NTP client will
be used. The drift compensation value will be stored in NVRAM and written to the config.da0 file,
if the router looses power or is rebooted it will not need to re-calculate the accuracy of the NTP
servers again. The compensation value is constantly monitored to ensure it remains correct.
Using the Web Page(s)
The Configure > NTP page allows you to set up the parameters for the NTP client.
Operational Mode:
Specifies the mode, either SNTP or NTP. If SNTP is used the accuracy of around 1 second is
achieved. If NTP is used 200 microsecond accuracy can be achieved.
Initial drift compensation:
If known, the drift compensation can be entered. Otherwise the router will calculate this value
of a period of time. Once calculated, this field will have the drift value filled in.
NTP host:
This is the IP address or host name of the first NTP server you wish to use.
Broadcast mode:
When enabled, the NTP client will operate in a different manner. Rather than sending out an
NTP client message and expecting a reply, the NTP module will send out a broadcast mode
packet to the IP address configured in ’NTP host’ field. The broadcast interval will be deter-
mined by the value of ’Minimum poll interval’.
Minimum poll interval:
The minimum polling interval between updates sent by the router. The value is actually the time
in seconds represented as a power of 2. i.e. a value of ’4’ means that the minimum poll interval
is 2^4 = 16 seconds.
Maximum poll interval:
The maximum polling interval between updates sent by the router. The value is actually the time
in seconds represented as a power of 2. i.e. a value of ’4’ means that the minimum poll interval
is 2^4 = 16 seconds.