On 2010-02-01, David Lord <[email protected]> wrote: > unruh wrote: >> On 2010-01-31, David Lord <[email protected]> wrote: >>> problem with ntpd refclock and pps via parallel port >>> >>> Hi >>> >>> So does pps really need a refclock and/or does pps via >>> parallel work ok or not on NetBSD-5? >> >> Yes. Otherwise it has no idea what the seconds is. Ie, all pps does is >> deliver a pulse at the exact second boundary, but that says nothing >> about which second that is the boundary of. You need some other source >> to give you the seconds. > > Sorry, I missed mention of the local ntp peers. > > There were three local servers to give time to second, one being > a pool server with radioclock that I was attempting to distribute > pps from via parallel port. Docs I have indicate a server can be > used to get "second" in place of refclock,
Yes, it certainly can. However you should make sure that your system is within a half second of the correct time before starting the PPS. Otherwise the PPS will just take the current seconds, and lock you onto a time which is out by seconds. > > I'm now thinking that might still be the case and parallel port > implementation on NetBSD isn't correct. I've not yet had time > to figure out where I'm currently getting my pps from, DCD on > serial, or NACK on lpt0. > > I can try again on desktop but now I have present config working > will give that a week to get some reasonable stats. > > cheers > > David > _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
