If you already have several computers running NTP why add yet anther? Configure them all as peers and add an reference clock. Do you really need a dedicated NTP server? I'd think that all you need is a reference clock of some kind, such as a GPS receiver and to change some nt..conf files.
On Tue, May 12, 2015 at 6:26 PM, Mark Spencer <[email protected]> wrote: > Thanks for this. This (and the other responses) were the type of answers I > was hoping for. > > The budget is probably up to several thousand for a robust COTS product that > won't add significant operational hassles. (Kludging a laptop to run as an > NTP server would be an example of a solution that would add operational > hassles.) Equipment designed for rack mounting is a bit less than ideal (the > equipment bay in the vehicle is not really set up for rack mounted gear) but > we could probably work out a way to mount a one u device, and mounting a > laptop adds it's own set of challenges, although a laptop can be mounted > outside of the equipment bay. The ideal form factor would be something the > size of a small paper back book (or smaller) that could be surface mounted or > secured via clamps to a piece of tubing that is already in the equipment bay. > > > > Sent from my iPad > > On 2015-05-12, at 3:03 PM, Bob Darlington <[email protected]> wrote: > >> What's your budget? I've done this with 1U sized NTP servers from >> Symmetricom (S300 and S350 systems) for mobile military use. These are a >> few thousand bucks a pop. They're rugged, and held up just fine in places >> the military goes.Compared to the rest of the system I was working on, this >> was quite small in comparison and we used more than one at each location. >> My personal one died recently so I'm working on developing a cape for the >> BeagleBone Black. The prototype is working just fine so far so I'm moving >> forward with a board layout and eventual sale to the list members if there >> is any interest (I'm not asking for interest yet). >> >> -Bob >> >> On Tue, May 12, 2015 at 11:11 AM, Mark Spencer <[email protected]> >> wrote: >> >>> Hi sorry for a possibly OT post. >>> Has anyone had practical experience with small commercially available time >>> servers / ntp servers suitable for mobile use in a vehicle. >>> >>> The use case is I am in need of an accurate (ie. within 100 ms) time >>> source for several pc's in moving vehicle. Being able to run directly >>> off a 13.8 or 28 VDC source would be a major plus but AC power is also >>> available. >>> >>> Hold over if there are gaps in GPS coverage is also a major plus. >>> >>> We already have a GPS with a 1 pps output, but an integrated box with it's >>> own GPS would be best. >>> >>> Yes I am aware I could feed a 1 pps signal into a laptop and use that as a >>> time server and I may end up going that route. >>> >>> There is a small Ethernet LAN in the vehicle. The pc's currently get >>> their time via a wireless connection to various NTP servers. I need to be >>> able to ensure accurate time on the PC's if there is no wireless coverage. >>> >>> >>> This is for a one off project so piecing together various parts is an >>> option but a single box COTS solution would be nice. I've found a few >>> candidates via web searches but would welcome any feed back. >>> >>> Thanks in advance >>> >>> Mark Spencer >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
