[aprssig] RADIO paths in APRS Servers

[Lynn W. Deffenbaugh (Mr)]

Robert Bruninga wrote:
>
> Good question.  Yes, but with the caveat that I mentioned:
> "(Some WIDE1-1's will never be)."
> And a few other cases of WIDE1-1 digipeating:
>
> VAST MAJORITY:  Even though most mobiles use the path of
> WIDE1-1,WIDE2-1 so that they can use any convenient fill-in
> digis, I would guess that 98% of the time, those packets are
> first picked up by a full-new-N digi.  Hence the vast majority
> of these will get the call insertion and traceability:  
> K4HG>APRS,W4XYZ*,WIDE1,WIDE2-1:...
>
> SMALL MINORITY:  Next, some WIDE1-1 fill-in digi's do use fully
> capable TNC's and these also will do callsign insertion, or
> substitution:  
> K4HG>APRS,W4XYZ*,WIDE1,WIDE2-1:...
>
>   
Wouldn't these two cases actually come out with the WIDE1 marked used 
(WIDE1*) with their callsign inserted before that as in:

K4HG>APRS,W4XYZ,WIDE1*,WIDE2-1:...

There's documentation on http://www.nwaprs.info/widen-n.htm that implies that some buggy KPC-3 (xxxx-7265 or earlier) that will show what you show, but it also describes that as "incorrect behavior" (in yellow at the bottom of the page).

Lynn (D) - KJ4ERJ - Still testing my understanding

PS.  Although I HAVE seen what you show in your example, most of the digi'd packets I've looked at show the WIDE1*, not W4XYZ*.

PPS.  However, if you actually have a chance to see the raw AX.25 packet, there's an amazing lack of consistency on whether or not stations prior to the final used one are marked used or not.  Consider the following paths intercepted from my TT4's KISS stream directly off the RF.  Note how AI4LE-1 and KA1VRF-7 mark their source call "used" and the fact that all inserted calls are actually marked used although if you look at the raw packets coming over APRS-IS, only the last used station is so marked.

W9DVM>APTW01,WC4PEM-10*,WX4MLB-3*,WIDE2*:....
AI4LE-1*>RXRV4T,KC4ZVV-2*,WC4PEM-14*,WX4MLB-3*,WIDE3*:....
KF4KCI-7*>R7RQ2S,W4OT-3*,WIDE1*,WIDE2-2:`l:....
KF4KCI-7*>R7RQ2S,W4OT-3*,WIDE1*,WC4PEM-13*,WIDE2-1:`l:....
NI4CE-12>APN391,WC4PEM-14*,WC4PEM-15*,WIDE2*:....
WC4PEM-11>APN391,WIDE2-2:....
WC4PEM-13>APN391,WIDE2-2:....
WC4PEM-13>APN391,WX4MLB-3*,WIDE2-1:....
W9GPI>APT311,KC4JQH-10*,WIDE1*,WC4PEM-14*,WIDE2-1:....
W9GPI>APT311,KC4JQH-10*,WIDE1*,WC4PEM-14*,WX4MLB-3*,WIDE2*:....
KG4JSZ>APTW01,WC4PEM-15*,WC4PEM-13*,W4OT-3*,WIDE3*:....
AI4LE-1*>RXRV4T,WC4PEM-15*,WX4MLB-3*,WIDE3-1:....
KA1VRF-7*>R7SV6P,W4OT-3*,WIDE1*,WIDE2-1:....
KG4CWC-9>2VTV6V,K4PKT-3*,W4OT-3*,WIDE2-1:....
KG4CWC-9>2VTV6V,K4PKT-3*,W4OT-3*,WX4MLB-3*,WIDE2*:....
N4APD-1>APTW01,WC4PEM-14*,WIDE1*,WX4MLB-3*,WIDE2-1:....
AI4LE-1*>RXRV4T,W4OT-3*,WX4MLB-3*,WIDE3*:....
KG4YZY-11>APU25N*,WC4PEM-14*,WIDE2-1:....
KG4YZY-11>APU25N*,WC4PEM-14*,WX4MLB-3*,WIDE2*:....

Unfortunately, none of these packets show the non-used before used that I was trying to show, but now that I think about it, those may result from a Digi responding to a preemption (out of order) path as described on http://wiki.argentdata.com/index.php?title=Digipeater_Setup#Preemption?