Re: TNC Software emulator - talk with KISS interface

From: Tomi Manninen (terhi.victor@logonet.com)
Date: Fri May 02 2003 - 19:30:59 EEST

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    On Fri, 2 May 2003, Sriram Chadalavada wrote:

    > I am looking for software (KISS-based)TNC emulators
    > that can run on Redhat 7.3 configured with AX.25
    > support.
    > Currently, I have installed KISS interfaces on two
    > Linux boxes and made them talk. But our project
    > (KUTESAT) needs emulation of an AX.25 link between two
    > systems ie a KISS interface on host talking to a sw
    > TNC which in turn communicates with its counterpart on
    > the other machine.

    Hmm... What do you mean by an AX.25 link? What kind of signals do you need
    for the link?

    The KISS "protocol" is simply a very simple encapsulation of AX.25 frames
    over serial lines. When using KISS mode, a TNC actually hands over all the
    AX.25 protocol handling to the host PC. The TNC is left only with HDLC
    processing (bit stuffing and framing), CRC checking and the actual
    modulation/demodulation.

    I would say that two computers talking KISS to each other, actually have
    an AX.25 link.

    But maybe you need something else? Syncronous HDLC signals maybe?

    > I looked up on the web and found tfkiss
    > rpm which works on Suse. Can this be used on Redhat
    > 7.3 too (installation as rpm or from source)? If so,
    > is it possible to make it work with the KISS
    > interfaces described above (created by using
    > kissattach command)?

    I'm not very familiar with the TFKISS software but my understanding is
    that it enables one to use a KISS TNC with terminal software that is
    written for the so called WA8DED HostMode. So the serial port will still
    be talking KISS. And you can not make TFKISS talk with the linux kernel.

    I don't think this is what you want (?). 

    -- 
Tomi Manninen           Internet:  iegdp.vcqxxukhbw@micropowersystems.com
OH2BNS                  AX.25:     vaxb@mx.dy.fi
KP20ME04                Amprnet:   cfujvzn@uniteddrugs.com

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