asterisk users - Oct 2006 - Bridging of PRI calls

Hello !

I 've some questions how bridging of ISDN calls is done.
Assume an asterisk system with a TE405 card equipped.
(PRI1 - PRI4)
An incoming ISDN call on PRI1 is transfered back to
PRI3. Unless there is DTMF detection or other things
involved, the bridging is done without Asterisk. Does
this card have a some sort of cross connection ? Does
the PCM leave the card ? Or is there some DMA magic in-
volved ?
Assume an asterisk system with two TE405 cards equipped.
An incoming ISDN call is transfered back to the second
TE405 card. Does this card have a seperate bus like H.100 ?
How is the bridging done in this scenario ?

I could not find useful information on the Product sheet,
sorry.

Best regards

Hans

On Oct 12, 2006, at 1:17 PM, Johann Steinwendtner wrote:
> Hello !
>
> I 've some questions how bridging of ISDN calls is done.
> Assume an asterisk system with a TE405 card equipped.
> (PRI1 - PRI4)
> An incoming ISDN call on PRI1 is transfered back to
> PRI3. Unless there is DTMF detection or other things
> involved, the bridging is done without Asterisk. Does
> this card have a some sort of cross connection ? Does
> the PCM leave the card ? Or is there some DMA magic in-
> volved ?
> Assume an asterisk system with two TE405 cards equipped.
> An incoming ISDN call is transfered back to the second
> TE405 card. Does this card have a seperate bus like H.100 ?
> How is the bridging done in this scenario ?
If the call is between two spans on the card, there is an internal 
"H.100-like" bus that cross connects the timeslots.

Matthew Fredrickson