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[aprssig] Digpeater setup

Robbie - WA9INF mwrobertson at comcast.net
Thu Mar 31 17:24:21 UTC 2005


Bob,

Robert Bruninga wrote:
>>>>dsparks at pobox.com 3/30/05 11:35:17 PM >>>
>>
>>... We now recommend that use of WIDE and RELAY are 
>>obsolete ... because [they do]  more damage than good.  
> 
> 
>>... but  isn't there a role to be played by a modified RELAY 
>>digi?  What about a  setup where such a station keeps track 
>>of recent [packets] received directly,  and then digis them 
>>only *IF* they aren't heard being resent by a WIDE digi 
>>within a certain period of time, like 20 sec., let's say?
> 
> 
> Absolutely, that is a greaat solution.  But it should not be
> based on the dupe-generating-RELAY legacy.  SImply let
> that same algorithm work on WIDEn-N packets at that
> "fill-in-digi" location.  We must wean ourselves from starting
> paths with RELAY which has no really good dupe-elimination
> process in most of the digis out there.

Please explain how RELAY causes DUPES? If I am understanding it, a dupe 
is when a station retransmits a packet that was digipeated by a previous 
RELAY. Not when two stations digipeats a packet it heard from the 
tracker direct.. That is not DUPLICATION.. WIDEn-N digipeaters also 
attempt to digipeat what it hears direct. If that tracker is using only 
WIDE2-2 in its path, and both WIDEn-N hears it, then digipeats it, isn't 
that DUPEs also according to the way you make is seem?

So, if home RELAY fill ins are spaced properly, what is the problem? 
They are doing what they were put there to do assuming that the tracker 
couldn't reach a WIDEn. No other home station RELAY that doesn't hear 
that tracker direct, will digipeat the tracker because the RELAY in the 
original path has been stripped and replaced with the original RELAY.

I fail to understand your statement that home RELAYs cause so much 
duplication.. Too many definitely can harm a network I agree because of 
all the collisions of the RELAYs that hear the tracker direct.

So in short, a DUPE to me is a packet sent by a RELAY that was received 
from another RELAY. It is not a DUPE if two RELAYs attempt to digipeat 
the same received direct from the tracker's packet.

Same as WIDE by itself, should not cause a DUPE, but if more than one 
WIDE heard the direct packet, they would digipeat what they heard. 
WIDE,WIDE or RELAY,RELAY could cause one station to DUPLICATE its 
previous digipeated packet because it sees RELAY or WIDE again from the 
other digipeater...

> But it is fantastic if we can have smart-digis do as you
> suggest.  But just let them work on WIDEn-N and not
> RELAY that is flooding us with dupes all the rest of
> the time...
> 

I would assume again that you mean that multiple stations hearing the 
trackers packet direct that you say is flooding us with all the dupes?

Simple solution is to limit unnecessary home RELAYs.

Robbie






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