[ntp:questions] Re: NTP sync on a standalone network (Windows 2k)

[Richard B. Gilbert]

Alexandre Carrausse wrote:

> "Wolfgang S. Rupprecht" 
> <wolfgang+gnus20060818T141853 at dailyplanet.dontspam.wsrcc.com> wrote in 
> message news:87mza1zqnv.fsf at bonnet.wsrcc.com...
> 
>>If you are allowed to have fiber-optical signals go into the room (but
>>not out) you might be able to run a GPS in some not quite so secure
>>area and send only the NMEA and/or PPS into the secure area.
> 
> 
> I agree but the link between the GPS antenna and the secure area will be 
> coper, not fiber.
> 
> Are you aware of a GPS solution that would use fiber?
> 

If you are allowed to have a fiber optic link but not a copper link you 
could run NTP over the fiber link!  I'm not aware of any refclock that 
uses a fiber optic output but if you can put a fiber optic Ethernet NIC 
in a PC outside and a PC inside and connect the two. . . .  If the 
inside machine runs a firewall that only allows the NTP protocol to and 
from port 123 only. . . .  Fiber optic NIC's are rare and expensive but 
there are, or were, such things.