[aprssig] time for APRS second generation network?

[Robert Bruninga]

>>> scott at opentrac.org 1/5/05 5:10:56 PM >>>
>That's only true of a pure ALOHA network.  If you've got...
>Just plain old GPS timeslotting will get you a lot more than 60 users
on a
>local channel with a reasonable beacon rate, but it's not easy to
manage and
>it's not portable.

Yes, and no.
No, because the ALOHA calculation already assumes PERFECT CSMA 
and time slotting with no collisions at all!  I think what people
havent picked up on is that the ALOHA circle is the "maximum
possible" net size with perfect 100% loading.

It is significanly less in practice if anything more than direct
(CSMA) paths are involved.  GPS time slotting can at most
get it up-to the ALOHA limit (here I am using the defnition
that we have asopted for APRS for "aloha" and not the
random no-csma original model which only applies to
connected protpcols with acks)..

But again, since APRS is designd for local-real-time events
you might have that many at a big event and then CSMA can
work and almost achleve that goal..

Bob