[aprssig] Preemption Digipeating
Lynn W. Deffenbaugh (Mr)
ldeffenb at homeside.to
Thu Oct 14 11:32:26 EDT 2010
A question about Preemptive Digipeating:
If a station transmits a packet with a path of WIDE1-1,WIDE2-1,SAR and
the SAR-1digipeater is configured to preemptively digipeat on SAR, what
will/should the digipeated packet path be A, B, or C?
A) - WIDE1-1,WIDE2-1,SAR-1,SAR*
B) - SAR-1*,WIDE1-1,WIDE2-1
C) - SAR-1,SAR*,WIDE1-1,WIDE2-1
I tried this with a T2-135/OT2m and got D) WIDE1-1,WIDE2-1,SAR-1* which
is basically A with callsign substitution instead of insertion.
I personally find B or C more useful as it preserves the original
desired path rather than preemptively removing the path by jumping the
Used flag to the end of the path. I realize that an original
WIDE1-1,WIDE2-1,SAR,WIDE1-1,WIDE2-1 could accomplish the same thing, but
I think we'd all agree that is a bit extreme.
I'm looking for both how preemption is handled in existing devices
and/or software and also if it would be considered safe and/or
acceptible to support C in a new software implementation.
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
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