[Asterisk-Users] T100P / ZAP / PRI errors

[Scott Stingel]

That makes sense.  I've always found the following wording (from the sample
file) confusing, not clear about whether "this" and "this span" referred to
the span connection on the card, or the span itself:

# The timing parameter determines the selection of primary, secondary, and
# so on sync sources.  If this span should be considered a primary sync
# source, then give it a value of "1".  For a secondary, use "2", and so on.
# To not use this as a sync source, just use "0"

So just to clarify some more, I assume if you're using a 4-span card like a
TE410P, you would have something like this (in a T1 environment with all
connected to a telco switch):

span=1,1,0,esf,b8zs,yellow    (primary time source)
span=2,2,0,esf,b8zs,yellow	(secondary time source)
span=3,0,0,esf,b8zs,yellow	
span=4,0,0,esf,b8zs,yellow

Do you agree with this?  (the "yellow" is an optional parameter)

Cheers
Scott Stingel
www.evtmedia.com


-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com] On Behalf Of Bisker, Scott
(7805)
Sent: Tuesday, April 13, 2004 4:59 AM
To: asterisk-users at lists.digium.com
Subject: RE: [Asterisk-Users] T100P / ZAP / PRI errors

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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