[time-nuts] thunderbolt for ntpd or gpsd

Didier Juges didier at cox.net
Tue Jun 10 22:11:51 EDT 2008

That's a good question: on the computer side, can a single serial port be
used for both 1PPS (for ntpd purposes) using one of the modem control
signals and for serial gps monitoring without having to write custom code? 

Didier KO4BB

PS: I would advise against going inside the TB and adding the 1PPS on the
serial port. Better keep these two separate, even though for ntp
applications, you don't need nS stability.

PPS: here is how I glued the power supply to the TB, for a compact package
(running from the UPS):

> -----Original Message-----
> From: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Tim Cwik
> Sent: Tuesday, June 10, 2008 5:41 PM
> To: time-nuts at febo.com
> Subject: [time-nuts] thunderbolt for ntpd or gpsd
> I am looking for advice.
> I have one of the group buy thunderbolts (thanks for all the work on
> this) and would like to use it as a local network time source.
> Are there timekeeping preferences between using the 
> thunderbolt as a ref clock for ntpd or connecting it to gpsd 
> and using the gpsd to ntpd capability? Running gpsd is one 
> more process to manage but does give access to the gps 
> infomation on the network.
> In either case, what is the preferred method of feeding the 
> 1PPS signal to the server? The Thunderbolt manual does not 
> show 1PPS on the serial port. I have not yet opened the case 
> to look. Do people commonly make this connection inside the 
> case or is it better to make a cable with serial on one end 
> and serial and a BNC on the other end?
> Thanks for any best practices information anyone can offer.
> Tim
> timenuts at stnhbr.com
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