Re: sbp2 device doesn't show; controller working?

Mark Knecht schrieb am 01.09.2004 -
> Chris Horn wrote:
>> I just ordered one of these:
>> http://fwdepot.com/thestore/product_info.php/products_id/429

> Does this card have any 1394 connectors, or is it just 1394b? I'm a
> little confused by the wording:
>
> "Provides Three Fully Backward Compatible, (1394a.2000 Fully Compliant)
> Bilingual FireWire 1394b Cable Ports at up to 800 Megabits per Second
> (Mbits/s)"
>
> Maybe I'm just missing where it says what the actual connector types are.

The "bilingual ports" can be used with 9pin--6pin or 9pin--4pin cables
(that let you connect 1394(a) equipment) as well as with any 1394b
equipment.

The wording "bilingual" is defined in the 1394b amendment. The 9pin
sockets are formed in a way that 9pin--6/4pin cables only fit into the
bilingual variant of the 9pin sockets. 9pin--9pin cables fit into any
9pin socket. AFAIU, PHYs that provide bilingual ports must impement the
so-called border node functionality that translate between 1394(a) and
1394b-"beta mode" signalling/ bus arbitration/ bus configuration.

A card with 3 bilingual ports is thus more flexible than a card with 2
bilingual (or even 2 monolingual) 9pin ports and 1 6pin port. The only
advantage of a card with a 6pin port is that you don't need to shop for
a 9pin--6/4pin cable in order to re-use 1394(a) equipment.

-- 
Stefan Richter
http://arcgraph.de/sr/
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