Ramon replied:
> I don't completely agree. AX.25 is heavily based on X.25, where the address
> field and the use of repeaters is extended. But the signalling (SABM, RR,
> DISC, etc) is quite similar to X.25. AX.25 is closely related to X.25, but
> there are HAM-specific differences.
AX.25 is based heavily on the datalink protocol specified within X.25,
which is based on HDLC. Most of the X.25 specification is completely
irrelevant to AX.25.
AX.25 + Rose is much more closely related to X.25, but there are still
some significant differences.
> Anyway, how official is AX.25? The X-protocols are developed/approved by
> ANSI committees if I'm not mistaken, who is the regulatory organ that
> gives/gave the advisory on AX.25 ?
How official does it need to be ? There is a published specification backed
and supported by a demographic comprising the community that use it. Sounds
official to me.
X.25 is a C.C.I.T.T. recommendation. ANSI have nothing to do with it.
I think ISO-8203(?) is the ISO standard.
> (Please don't understand this wrong... the HAM radio world basically agrees
> on WHAT AX.25 is, and what its range of use is.)
Actually, recent discussion leads me to eblieve this isn't actually
very true. There are a number of 'extensions' to AX.25 that are not
'official' in the same way the AX.25 specification is. It would be
a profitable and useful exercise I believe to at least collect and
document these in an attempt to standardise them.
> Makes us think about better protocols than AX.25 with HDLC. Something that
> takes care about error-avoidance and recovery in a radio environment. This
> is something where we (the radio amateurs) can contribute to, something that
> hasn't been chewed on by the academic and industrial world for years and
> years.
Yep it's time we started.
> And long live Linux! At least an operating system that allows us an easy
> implementation of whatever protocol we want to experiment with... The times
> of NOS and MS/DOS are gone...
not gone, but fading perhaps. They still have a place.
regards
Terry