[aprssig] Another advantage of SSn-N replacement for WIDEn-N
bruninga at usna.edu
Tue Dec 14 12:12:12 CST 2004
Here is another advnatage of replacing WIDEn-N with SSn-N
as a UITRACE parameter in overloaded digis:
We used to have to begin a path with WIDE,WIDE2-2
for two reasons:
1) so that the first digi would do callsign substitution so that
we could indentify the source digi.
2) so that if the first digi was not WIDEn-N capable then
at least the station would get out.
Problem was that this caused extra copies to be generated
by all surrounding WIDE digis and propogated by n-N digis.
Under this new SSn-N paradigm, we want the universal
(non mobile path) to be SS2-2 (or so depending on local load)
without having to preceed it with a WIDE. Here is how!
1) Since SSn-N uses the digi's UITRACE parameter we
automatically get the "first-digi" identificaiton.
2) We get these packets to the other LOCAL WIDE-only
hardware by Curt's suggestion of adding SS2-2 and SS2-1
to their UIDIGI list.
This is a WIN*WIN since we no longer start with the dupe-
generating WIDE yet still the "WIDE" only digis will digipeat
it. But the copies they generate GO NO FURTHER because
the SS2-2* or SS2-1* packet is used up. Yet the original
SS2-2 that hits an n-N digi will go forward as they should.
Obviously if the ONLY digi that a user can hit is a WIDE-only,
then he must begin with WIDE or its call, but this use of
SS2-2 as the universal local path will see a lot less local
dupes... compared to WIDE,WIDE
More information about the aprssig