[Asterisk-Users] Zaptel T1 Timing Source

[Greg Oliver]

Circuit timing is only to let the hardware know how to keep in sync with
framing and what it is supposed to be.  T1 timing will always be the
same, so syncing your card to any of them will be fine.  Syncing to 2 -
1 as backup would be best, etc..

Timing has nothing to do with the remote end - it remains local.  If you
have your own stratum source, you could use it instead of "line".

-Greg

On Wed, 2005-11-09 at 13:06 -0500, Waldo Rubinstein wrote:
> These are REAL Telco T1s and not connected to a PBX. Am I to assume  
> that even if they are different providers the timing should be the  
> same? That doesn't make a lot of sense to me.
> 
> Thanks,
> Waldo
> 
> On Nov 9, 2005, at 12:34 PM, Bart Fisher wrote:
> 
> > 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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