On Fri, Apr 29, 2011 at 4:10 AM, Cristian Seres <[email protected]> wrote: > Hi! > > I am looking for a solution to install an NTP server in a very restricted > network which can not be connected to other networks even through a firewall > because of strict security policy. RS232 and usb are ok. Using GPS or DCF77 > reference clocks would require a long antenna wire to get signal. Installing > the antenna cable would be expensive, but there is good LAN cabling between > a space with good GPS signal and the room with high security.
This is easy. Install the GPS but use a very short antenna cable. Then the output of a GPS is in two parts (1) A serial data stream and (2) a pulse per second. Both of these can go over the LAN cable. You never want a long antenna cable because of the losses in a long run. It is best to keep that cable short and send the data from the PS back over a digital cable -- ===== Chris Albertson Redondo Beach, California _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
