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[aprssig] Path Precedence

Peter Devanney pdevanney at sympatico.ca
Thu Jul 22 16:18:33 UTC 2004


Bear with me while I get my head around this,

What happens if a RELAY is not within range of my station, but a WIDE is. With a path of RELAY, WIDE2-2 will I still get digi'd by the WIDE?

Or if I set my path as SAR,RELAY,WIDE2-2 (SAR is only on 1 digi). If I am within range of SAR I get digi'd by SAR and then possibly a relay and so on...

If I am not within range of SAR but am within range of a RELAY, will I get digi'd by the RELAY and then the WIDE...

73

Peter
VA3YOW
> 
> From: "AE5PL Lists" <HamLists at ametx.com>
> Date: 2004/07/22 Thu AM 08:06:29 EST
> To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
> Subject: RE: [aprssig] Path Precedence
> 
> Path's are sequential.  In other words, RELAY,WIDE2-2 will go through a
> RELAY then a WIDEn-n then another WIDEn-n digi (actually, as has been
> pointed out before, multiple WIDEn-n digi's will probably repeat this
> packet due to WIDEn-n digis seeing each other).
> 
> WIDE2-2,RELAY is very bad!  You hit one WIDEn-n, let's say.  There are 3
> other WIDEn-n's that hear that one (again, this is just an example).
> Now those 3 WIDEn-n digis are each heard by 2 other WIDEn-n's that digi
> RELAY as well as 3 or 4 homes that digi RELAY.  3*(2+3) = 15 digis of
> the packet on the third hop!  And that doesn't even take into account
> the fact that many WIDEn-n digis won't dupe check the RELAY path so you
> will also get a ping-pong effect.
> 
> This last point is why, also, you want to use WIDE2-2 instead of
> WIDE,WIDE  Many WIDEn-n digis don't dupe check non-UIFlood packets and
> WIDE,WIDE can cause definite ping-pong effects.
> 
> Finally, since path's are sequential, it does matter where you put SAR
> in your path.
> 
> Good question and one that is misunderstood by many who are new to
> packet radio.
> 
> 73,
> 
> Pete Loveall AE5PL
> mailto:pete at ae5pl.net
> 
> > -----Original Message-----
> > From: Peter Devanney
> > Posted At: Thursday, July 22, 2004 6:43 AM
> > Subject: [aprssig] Path Precedence
> > 
> > 
> > I am curious about path structure and precedence.
> > 
> > For example, a popular path is RELAY, WIDE2-2 (or WIDE, WIDE)
> > 
> > If the path was WIDE2-2,RELAY would the behaviour of the 
> > routing be the same of different?
> > 
> > If I use an alias for a special event e.x. SAR. Does it 
> > matter where in the path statement the SAR is placed.
> > 
> > 73
> > 
> > Peter
> > VA3YOW
> 
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