[Asterisk-Users] Dual Timing Sources

[Matt]

Well that's what I did and they seem to be operating just fine.   The
CLEC told me even though they are the same CLEC, it is a different
switch.. but yeah hehe in theory I guess the timing would have to be
the same since THEIR switches are linked, eh?


On 4/28/06, qrss at keitz.org <qrss at keitz.org> wrote:
> The following information is accurate for a situation where both T1s are
> connected to telco switches and the telco is therefore providing the
> timing signals. If one of the T1s is point to point (such as a tie line)
> then this information may or may not apply depending upon what's on the
> remote end.
>
> Configuring one of your T1s as the primary timing source tells Asterisk to
> sync to that T1's data stream as a reference clock for all data moving in
> and out of the system. Since both T1s are from the same provider, all
> clocks will be in sync. Even T1s from different providers are going to be
> pretty much in sync. You should be able to pick either T1 as your primary
> clock source. You can have only one primary clock source.
>
> The secondary timing source only comes into play when the first one fails.
> If the T1 that is your primary clock source fails, then Asterisk will
> begin using the secondary source. Without a secondary clock source
> configured, most equipment would instead switch to an internal clock
> source which would cause slips on the non-failed T1. Configuring a
> secondary clock source can help to ensure that you don't lose both T1s
> just because the primary fails.
>
> If possible, you should select whichever T1 is least likely to fail as
> your primary clock source. If there is no way to determine that, then just
> pick one.
>
> If you are interested in some detailed information about what timing is
> and how it works, this link looks pretty good:
>
> http://www.oreilly.com/catalog/t1survival/chapter/ch05.html
>
> > Ok.. I sort of lied.. it's the same CLEC but two different switches..
> > was told by them since they are different switches I needed primary
> > timing.... so in theory it should work if I set it as secondary.. ok
> > we'll try!
> >
> > Just out of curiousity.. what happens if I set both as 1 (primary?)
>
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