[ntp:questions] NTP server with no network, no GPS signal

Steve Kostecke kostecke at ntp.org
Fri Apr 29 12:32:55 UTC 2011

On 2011-04-29, Cristian Seres <cristian-2 at contrasec.fi> wrote:

> 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.

You could use:

IRIG Audio Decoder - http://doc.ntp.org/4.2.6p3/drivers/driver6.html

Search http://www.google.com/search?q=IRIG+ntp+server for IRIG time
source vendors.

PPS Clock Discipline - http://doc.ntp.org/4.2.6p3/drivers/driver22.html

Dumbclock - http://doc.ntp.org/4.2.6p3/drivers/driver33.html

Steve Kostecke <kostecke at ntp.org>
NTP Public Services Project - http://support.ntp.org/

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