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[aprssig] Bufferless KISS TNCs ?

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Tue Nov 10 13:59:23 UTC 2009


I think you need to read up on the AX.25 actual on-the-air protocol.  It 
is a bit-wise protocol complete with required bit-stuffing and already 
includes error detection at the end of each packet.  The on-the-air 
protocol is NOT byte-delimited, but is a BIT stream.  Getting that 
stream back to the PC and allowing local validation could be as easy as 
simply adding the current AX.25 checksum to the end of the KISS packet.

However, it is inevitable that someone somewhere would hook up one of 
these to software that expects to receive only good packets and we'd end 
up with lots of bit-errorred packets all over APRS.

Lynn (D) - KJ4ERJ - Just my $0.02

Matti Aarnio wrote:
> I have thought about ways to make new better TNCs, possibly with
> less resources in TNC than currently, yet providing better access
> to radio channel for a host with the real smarts in them.
>
> I wrote up a story about it at:
>
>    http://wiki.ham.fi/Bufferless_TNC
>
> Can anybody say, if this scheme would not work?
> (Besides of the disadvantages already mentioned there.)
>
>
> 73 de Matti, OH2MQK
>
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