[Asterisk-Dev] A few driver ideas...

[kpj at junghanns.net]

>
>> > I've had a bit of a look around the datasheets and can't see if
> that's
>> > possible or not, but nothing obvious leaps out. About zaptel timing,
> is
>> > the timing supposed to come from the card which is in turn supposed
> to
>> > come from the [BP]RI interface? Or does the card just need a 1Khz
> clock
>> > (or something you can derive 1Khz from) on it. And in that case,
> would
>> > it be sufficient just to use the system timer a-la ztdummy? I assume
>> not, but if you know the reasons I'd love to know!
>>
>> The card/chipset needs to have a 1khz timer that fires an IRQ.
>> This timer should be derived from the BRI line.
>> You cannot easily use a different timing source (like ztdummy) because
>> it is not synchronized to the BRI line. I tried this with RTAI
> (realtime
>> application interface) support for the zaphfc driver.
>>
>> >
>> > Assuming it can't generate the 1Khz timing, would it still work in a
>> system with another card that could do zaptel timing?
>>
>> No.
>
> I'm learning more about zaptel timing than ever before :)
>
> So if you had 3 cards (say 1 PRI, 1 BRI, 1 FXO), the first two can
> provide zaptel timing to asterisk because it is generated in them from
> the exchange. But for their own signal processing, they need to use
> their own internal timing regardless of if asterisk is currently using
> it or not, eg the PRI can not make use of the timing from the BRI card.
>
> Is that right?

Sorry, i didnt quite understand that. Can you try to explain that again? :)

> Thanks
>
> James