Ntp gps rs232 on alix+pfsense
Hi guys , I need your help.
In the services section - > ntp I noticed that in pfsense there is the possibility to install a GPS module for the creation of a stratum 1 NTP server.
Now I pfsense 2.3 , standard version not nano , updated last night 05/04/2016 on a alix board apu1d4 .
I want to know me which GPS module take , inside the alix but also outside, in order to create the ntp server with pfsense .
I saw on the net that there are some devices that act as time server function but cost much .
many thanks in advance
ps I found this receiver rs232 on ebay
think will be fine ?