ISDN card questions

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A couple of questions about ISDN cards.

1) Shouldn't they be way cheaper than a standard modem ? My understanding
 is that ISDN is all digital, there is no need for complex DSP
 operation, and the device is even fairly low speed. Probably an
 ISDN-only modem should cost the same as a cheap Ethernet card.
 (I know volumes are against a low price...)

2) Any recommendation for a cheap ISDN modem which can be controlled
 with AT commands, or has programming info available so that a
 device driver can be implemented for FreeBSD/Linux ?

	Thanks
	Luigi
-----------------------------+--------------------------------------
Luigi Rizzo   | Dip. di Ingegneria dell'Informazione
email: luigi@iet.unipi.it | Universita' di Pisa
tel: +39-50-568533   | via Diotisalvi 2, 56126 PISA (Italy)
fax: +39-50-568522   | http://www.iet.unipi.it/~luigi/
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