[Asterisk-Users] T100P / ZAP / PRI errors

[Bisker, Scott (7805)]

In laymans terms.

To use your telco's T-1 as the timing source ....

span=1,1,0,esf,b8zs,yelllow


To use the internal clock of the card you would use (I'm pretty sure that this would only be used for channel banks, or connections to other PBX hardware.  I don't think a telco is going to use your PBX as a timing source)

span=1,0.0,esf,b8zs,yellow


If you have multiple telco connections on multiple spans you would have something like this

span=1,2,0,esf,b8zs,yellow    (secondary time source)
span=2,1,0,esf,b8zs,yellow	(primary time source)
span=3,0,0,esf,b8zs,yellow	(provide the time source, i.e. channel bank)


-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com]On Behalf Of
willy at yponeinc.com
Sent: Monday, April 12, 2004 9:39 PM
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] T100P / ZAP / PRI errors


Now you've got me utterly confused ...
So, in layman's terms, if I connect a T100P to a circuit
provided by the Telco, and the Telco says that they will
provide timing, I have to put WHAT?
span=1,0,0,esf,b8zs,yellow 
this means '0' this span is not a sync source, i.e. the
Telco will provide my 8kHz.  Could one use '2' with impunity
(span=1,2,0,...)? I am still not clear under which
circumstances one should use '0' versus '2'.
WW

----- Original Message Follows -----
> Holy crap people, trim your replies!
> 
> > You didn't say what's at the other end of your PRI line,
> > but you might try having the other end be the timing
> > sync source.  Try:  span=1,0,0,esf,b8zs instead.  Maybe
> that will help.
> 
> We need to get this documented *clearly* once and for all.
> 
> Zaptel T1/E1 hardware either free-runs to its own internal
> 8kHz time source,  or it tries to lock to the recovered
> clock from the line.
> 
> Zapata.conf says that timing of 0 means "do not use this
> span for timing."  Zero does not mean "slave timing", it
> means not to use this span as a  recovered clock source
> for timing at all.  Timing values of 1 or 2 mean try  to
> lock the internal clock to the recovered clock from the
> span.
> 
> A value of 0 means that this span's recovered clock never
> gets used as a  timing source.  A value of 1 means that
> this span is the primary clock source  -- If the span is
> up, try to lock the internal clock to the clock recovered 
> from this span.  A value of 2 means to use this span for
> timing only if the  primary span is down.
> 
> To reiterate: a value of 0 means that the other end must
> be locking to the  zaptel's clock or else clock slips will
> occur.
> 
> Feel free to correct me if I'm wrong, but I am pretty sure
> I have this  right.  :-)
> 
> Regards,
> Andrew
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Willy Wouters
ypOne Publishing

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