On Wed, Oct 01, 2003 at 06:40:07AM +0800, csj wrote: > At Tue, 30 Sep 2003 14:53:43 +0100, Pigeon wrote: > > A point about USB and modems is that USB is fast enough to make it > > possible to implement an external winmodem. It may well be > > safer/cheaper to use an RS232 modem with an RS232-to-USB converter. > > (having found one of those that's supported in Linux :-) ) > > Interesting. But is the probability of a RS232-to-USB converter > being Linux-compatible higher than the probability of a USB modem > being compatible? If the USB modem is an external winmodem, then definitely yes, as all you have to do is blurge data in and out without trying to replicate a complex closed-source DSP algorithm. > Is it just a dumb cable with a serial port > connector on one end and a USB connector on the other? Or is > there some fancy electronics involved (e.g. a chip embedded on > the serial side)? The latter. USB and RS232 are way different and there is no chance of building a simple passive converter. > How would Linux recognize it? What would be > the modem port? ISTR from http://www.ftdi.com - who make USB-to-some-easier-format conversion chips - the answer is 'something straightforward'. Long time since I looked at the site though. Chances are it would be recognised as a USB device and you'd need to symlink it to /dev/modem. It might depend on who made the conversion chip to some extent. -- Pigeon Be kind to pigeons Get my GPG key here: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x21C61F7F
Attachment:
pgpTIrX9YdS5E.pgp
Description: PGP signature