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    SubjectRe: [PATCH 0/9] isdn4linux: add drivers for Siemens Gigaset ISDN DECT PABX
    On 2005-12-19 18:01, Lee Revell wrote:
    > On Mon, 2005-12-19 at 17:38 +0100, Tilman Schmidt wrote:
    >
    >>Unfortunately these don't fit our needs, as we are not dealing with a
    >>network device, but with an ISDN device.
    >
    > Um, isn't that what the N in ISDN stands for?

    While the ISDN is indeed called a network, devices connecting a computer
    to it are nevertheless not commonly referred to as network devices.

    > I guess what you mean is that although ISDN devices are obviously
    > networking devices, the kernel uses a separate subsystem for ISDN?

    There's more to it than that. The notion of a "network" is a rather
    broad one, including such diverse phenomena as Ethernet, ISDN, TV cable
    or even roads or TV stations. The notion of a "network device", on the
    other hand, is a quite specific one, at least in the computer world, and
    it certainly doesn't include ISDN TAs.

    In fact, the operation of an ISDN device is much closer to a modem or
    even an answering machine than to that prototypical network device which
    is the Ethernet card. This is of course the reason why the Linux kernel
    puts them in a subsystem of their own. Making them net_device-s just
    wouldn't work.

    --
    Tilman Schmidt E-Mail: tilman@imap.cc
    Bonn, Germany
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