> Date: 27 Apr 1999 15:56:49 +0200
> From: Jonathan NAYLOR <[EMAIL PROTECTED]>
> Subject: Re: Compression in packet radio
>
> > I've watched the discussion about the need for compression to be added
> > to the various services run over packet radio. Why is everyone so
> > intent on modifying *every* service individually? What we need is to
> > have the ax.25 protocol layer negotiate compression on connect.
>
> ... and there is the problem. If the mapping was one-to-one between AX.25
> connections and services then we would possibly be OK. But a single AX.25
> connection can carry many things, not just user-to-user data, for example
> multiple NET/ROM, ROSE and TCP/IP sessions.
I don't understand what problem you are trying to highlight.
I understood the proposal to be link-level encryption that would
be "invisible" the higher-level protocols. This may present a problem
of selecting an optimal encryption approach, but the data should
still be delivered correctly.
Are we all talking about the same thing?
> The second point is to do with the efficiency of compression. To get good
> compression you need a reasonable amount of data and that means having
> access to (for example) the complete BBS message before transmission.
> This then means that we would have problems if we negotiated compression
> at each hop instead of end to end.
> [...]
Am I correct in understanding that you are assuming some sort of adaptive
compression? It seems that an encryption scheme that was effective for
ASCII text would be a big win in many environments.
-tjs
