asterisk users - Jan 2007 - how can PRI, BRI and analog cards achieve a synchronous clock / timing

hello list,

i have a problem regarding the synchronisity (clock source) when using
multiple cards.
e.g. when having connected one PRI port of our TE410P to the telco, i
need to have the analog card like the TDM400P or a B410P synchronous to
the clock of our telco provider. otherwise faxing on the analog cards
does not work or i get cracking noise or even hangups on my BRI lines,
due to bit slips.
as long as the ports are on the same pci-card, they're synchronous, but
not when one has to use another card (e.g. having a PRI telco line and
some analog fax machines or some BRI ISDN equipment served by asterisk)

junghanns or beronet have a solution for this (PCM port on the card;
they can even switch the voicedata over this bus), but i can't find any
solution for digium cards.

i've found a timing connector on the TE410P. can this somehow be utilized?

is there another (software) solution?

am i the only one with this problem (haven't found anything about this
on the mailing list)

thanks
  frank sautter

If you use a channel bank like the Adtran Atlas 550, you can specify a
primary sync to the telco, and every subsequent connection to the Atlas uses
that sync as a timing source. Expensive, but I expect you can pick one up or
something like it on Ebay. Nothin beats an Atlas, though. 

-----Original Message-----
From: Frank Sautter [mailto:asterisk@sautter.com]
Sent: Friday, January 19, 2007 12:47 PM
To: asterisk-users@lists.digium.com
Subject: [asterisk-users] how can PRI, BRI and analog cards achieve a
synchronous clock / timing


hello list,

i have a problem regarding the synchronisity (clock source) when using
multiple cards.
e.g. when having connected one PRI port of our TE410P to the telco, i
need to have the analog card like the TDM400P or a B410P synchronous to
the clock of our telco provider. otherwise faxing on the analog cards
does not work or i get cracking noise or even hangups on my BRI lines,
due to bit slips.
as long as the ports are on the same pci-card, they're synchronous, but
not when one has to use another card (e.g. having a PRI telco line and
some analog fax machines or some BRI ISDN equipment served by asterisk)

junghanns or beronet have a solution for this (PCM port on the card;
they can even switch the voicedata over this bus), but i can't find any
solution for digium cards.

i've found a timing connector on the TE410P. can this somehow be utilized?

is there another (software) solution?

am i the only one with this problem (haven't found anything about this
on the mailing list)

thanks
  frank sautter

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