Rules of thumb:
1. If you plan to connect more than one machine, use an ISDN router.
2. If you need 128K throughput, use an ISDN router, or if you must go the
cheap route, an internal card.
3. If you need POTS functionality, use an external TA or router, and choose
carefully- POTS quality varies widely between vendors.
4. If you're paying per channel-minute and need to add/drop the second B
channel based on bandwidth used, go with an ISDN router.
5. If you want to use the two B channels in two different locations or
dedicate them to two different purposes, you need an external NT-1 and
>>Ascend NetWarp 128 is a passive device, i.e. the brains of the card are
>>in software and is partially executed by the CPU (and you certainly have
>>the CPU horesepower, although the demands on the CPU are not that
>>heavy). The big advantage here is that for upgrades all you have to do
>>is install a new driver and away you go!
>And that's the main problem of internal passive devices. What's when I
>have to change my operating system. No one really supports more than
The Linux and *BSD guys are doing good work. And there are 'active'
internal devices that appear to the OS as a (slow) ethernet card.
Quote:>A external adapter communicates with the PC like a Modem, that means
>you can use it in DOS, Win95, WinNT, OS/2,Linux,Mac.........
If you plan to only use PPP and perhaps analog ports, the "best" solution
is the most expensive one- an external ISDN router instead of a "modem",
connected to one (or many) computer with an ethernet card.
An ISDN router provides the throughput of an internal card, but with
lower CPU load, the ability to use POTS jacks without booting your PC,
and for upgrades you just load new flash code (firmware). Plus it makes
it very easy to connect multiple machines without having to dedicate one
as a router.
The downside is that while a TA may run $280-$400, a router runs $800-$1200.
ISDN Router and TA reviews: http://www.veryComputer.com/
David Richards Ripco, since Nine*-Eighty-Three
My opinions are my own, Public Access in Chicago
But they are available for rental Shell/SLIP/PPP/UUCP/ISDN/Leased