[Asterisk-Users] Cannot get two TE410Ps to operate correctly in the same machine

[Peter Svensson]

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