2.4 Time Synchronization
AP10 requires accurate time to operate its VaiNet wireless connection, and to maintain correct
time on the connected data loggers. To achieve the accurate time, AP10 synchronizes with
Network Time Protocol (NTP) servers. The hostnames of the default NTP servers are:
0.pool.ntp.org
1.pool.ntp.org
2.pool.ntp.org
3.pool.ntp.org
Reaching the default NTP servers requires an internet connection. To allow the AP10 to
operate without an internet connection, replace one of the default NTP server addresses with
the address of your local NTP server.
AP10 has a supercapacitor as a backup power source for its realtime clock. If AP10 is left
without power for more than a day, the realtime clock will lose its time. If this happens AP10
will have to synchronize its clock with the NTP servers before it can operate its radio. This is
typically the case when an AP10 is installed - it needs to synchronize its clock before it can
start to connect VaiNet data loggers. Synchronization is also needed due to clock drift if the
NTP servers cannot be reached for more than three weeks.
Synchronizing with the NTP servers typically takes several minutes, during which
time the access point will show the NTP connection error. If you have just turned
on your access point or changed its NTP server configuration, it is normal to see
the error for up to 15 minutes.
2.5 Network Security
AP10 Access Point is intended to be connected to a secure internal network, not directly to the
internet.
2.6
Using a Third Party Power Supply
A DC power supply (Vaisala item 244784SP) is included with every AP10 Access Point. You
also can use other power supplies with the AP10, but make sure they
fulfill the specifications
listed in Table 3 (page 11).
Table 3 Specifications for a Third Party Power Supply
Property Specification
Operating voltage 10 ... 30 VDC
Output power min. 13 W
Chapter 2 – Product Overview
11
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