On Sat, 27 Nov 2004, Steve Underwood wrote: > Peter Svensson wrote: > >Most providers should be synchronized to a traceable time source derived > >from UTC. I.e. they should all tick exactly the same even if they are not > >directly interconnected. > > > > > Uh? UTC? I think you mean derived from a rhubidium clock, synced to the > rest of the world's rhubidium clocks. :-\
Which is what UTC (Coordinated Universal Time) is, in a loose sense. Actually, it is a time standard comprised of a weighted mean of clocks around the world based on different technologies (hence the weighting). All (or almost all) national time standards are traceable to UTC. See http://en.wikipedia.org/wiki/UTC for more info. The global telecom system is synchronized to UTC these days. I guess they are more interested in it as a stable frequency source. > >I think it would be nice if the zaptel card could be used as a high > >precision frequency source for ntpd. It is probably no that hard even. > > > > > The zaptel clock is atomic accurate when it is locked to a PSTN E1 or > T1. However, it has no special accuracy under other circumstances - > channel bank usage, free standing PBXs, analogue line cards, etc. What I ment was to use the frequency derived from the very stable digital pstn lines as a frequency source to ntpd. Peter _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users