[Asterisk-Users] Zaptel T1 Timing Source

[Bart Fisher]

My understanding there should only be one timing source per TE410.  You 
should use  a "REAL" Telco T1 for a timing source. - Otherwise, do not 
choose any if for example all PBX T1's installed.  The settings is only a 
priority level for asterisk to obtain the source.  Example: 1 = use this 
source first choice, 2 = use this source if source 1 is down, and so on..

Bart


----- Original Message ----- 
From: "Waldo Rubinstein" <waldo at trianet.net>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users at lists.digium.com>
Sent: Wednesday, November 09, 2005 9:12 AM
Subject: [Asterisk-Users] Zaptel T1 Timing Source


> Hi guys,
>
> I have a question about the timing source parameter in zaptel.conf.
>
> I have 4 T1s coming into a TE410P.
>
> One T1 is with one carrier, who provides timing signal.
>
> The other 3 T1s are from a different carrier, all sharing the same  timing 
> signal.
>
> Based on this, I have in /etc/zaptel.conf something like:
>
>
> span=1,1,0,esf,b8zs
> e&m=1-24
>
> span=2,1,0,esf,b8zs
> e&m=25-48
>
> span=3,2,0,esf,b8zs
> e&m=49-72
>
> span=4,2,0,esf,b8zs
> e&m=73-96
>
> What I have done is set the timing source of the first T1 to be the 
> primary source for itself.
>
> For the other three T1s, I set the second T1 to be the primary source  for 
> the group of 3 and the other two as secondary sources.
>
> Is this correct?
>
> The reason I ask is because every so often I hear people complaint  about 
> call drops. It doesn't happen to everyone, so I don't know if  it has 
> anything to do with time source selection and synchronization  issues that 
> may be affecting individual channels. After a report of a  call drop, I 
> check dmesg and I don't really see any errors. Sometimes  I just see ... 
> disable echo cancel... messages on specific channels,  but that shouldn't 
> be a reason to drop a call.
>
> Am I right? Any ideas?
>
> Thanks,
> Waldo
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