Date: Wed, 16 Jun 1999 12:38:42 +0200 From: Ladavac Marino <mladavac@metropolitan.at> To: 'Jonathon Doran' <doranj@Colorado.EDU>, freebsd-questions@freebsd.org Subject: RE: Host-based modems Message-ID: <55586E7391ACD211B9730000C1100276179677@r-lmh-wi-100.corpnet.at>
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> -----Original Message----- > From: Jonathon Doran [SMTP:doranj@Colorado.EDU] > Sent: Wednesday, June 16, 1999 6:35 AM > To: freebsd-questions@freebsd.org > Subject: Re: Host-based modems > > > Have drivers been written to support 'host-based' modems (also known > > as 'Winmodems"? > > <snip> > > Even if its built in, why would anyone want a modem which requires a > power > cycle of the box in order to reset? Externals are great in this dept: > when > they get wedged, just toggle power on the modem. [ML] No, no, no, a winmodem is worse than that; an internal modem that emulates/has an UART and behaves like something behind a serial port is supported. But your typical winmodem does not *have* an UART; most of them do not even have the DSP chip required for bit extraction from the line "noise"--they let CPU do everything (the DSP algorythms are implemented in the driver). Since the line protocols are patented, there is no possibility for a (distributable) free software implementation thereof. Not to mention the fact that the access to the AD/DA circuitry is not documented and varies from model to model of a winmodem. They are cheap junk, the winmodems. However, there are internal modems which do provide their own UARTs and behave as normal modems behind a serial port. Sometimes these modems are also called winmodems, even though they are not and are supported. /Marino > Jon Doran > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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