[Asterisk-Users] Zaptel T1 Timing Source

[Waldo Rubinstein]

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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