User's Manual

Nordic ID PL3000 user manual, v. 2.6, October 2006 79

Page 1 : Service Conﬁ guration

The ﬁ rst page contains all SNTP service conﬁ guration

settings. The default NTP Server Address is “europe.

pool.ntp.org” which is a collection of NTP servers that

anyone may access. The standard NTP port is 123,

change this value only if you are sure your NTP server

uses a different port. Also verify that this port is not

blocked by any ﬁ rewalls along the route. The Update

Interval value speciﬁ es how often the SNTP service

should ask for the correct time. In most applications it is

pointless to have this value set to less than a few hours,

it only generates unnecessary trafﬁ c. Every time any one

of the PL3000’s network links change state, an address

change notiﬁ cation message is sent to all services in

the unit. This message causes the SNTP service to ask

for the correct time. This means every time the device

is rebooted, wakes up from sleep or associates with

a WLAN AP the correct time is automatically fetched.

Thus there is no reason to set the update interval to

anything less than one hour, three or six hours should

be sufﬁ cient for most applications. The Timeout value

tells the SNTP service how long it should wait for the

NTP server to reply to the request before giving up.

The Retries value sets how many additional attempts at

contacting the NTP server will be made if the ﬁ rst one

fails.