Re: USB Modem support

From: Hellmuth Michaelis (hm_at_kts.org)
Date: 05/29/03

  • Next message: Petri Helenius: "Re: Collision on NIC" 
    To: Brad du Plessis <bradd@cat.co.za>
Date: Thu, 29 May 2003 17:17:19 +0200 (CEST)

    Brad du Plessis wrote:

    > How do I find out before I go and buy a usb modem that its going to be
    > detected as a umodem or a ugen device.

    Take your notebook to the USB-dealer :-) and ask if you can connect the
    thingie to test it.

    > Are usb modems with CAPI support always winmodems?

    You mix things up.

    A modem (MOdulator / DEModulator) is a piece of hardware usually
    interfacing a RS232 serial line to a telephone line. The data
    from the serial line is converted into tones sent over the phone
    line which are decoded back to computer data on the remote end.
    The call control is usually done in-band by using the the Hayes
    AT-protocol.

    As Garret said, an USB modem is a device that claims in the USB
    control protocol to be a modem ( = RS232 is replaced by the USB).

    CAPI is an application programming interface for ISDN applications
    interfacing to some (PCI / ISA / USB / whatever) hardware device(s)
    (and it is also used for other communication stuff like X.25 etc.)

    There is NO such thing which is commonly called "ISDN modem".

    A winmodem is a little bit of hardware / silicon which perhaps is
    going to look like a modem when it is used by some proprietary
    binary-only software (= libraries = RS232 is replaced by some software
    which makes the silicon virtually look like a RS232 connector). I have
    no idea if you get this type of s**t with a USB interface ... (and in
    case you would get it, i think that the USB would be used to exchange
    highly propietary and undocumented data to interface the silicon to the
    software library).

    hellmuth 

    -- 
Hellmuth Michaelis       Hamburg, Europe       hm\at\kts.org        www.kts.org
a duck is like a bicycle because they both have two wheels except the duck (tl)
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  • Next message: Petri Helenius: "Re: Collision on NIC"

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