[aprssig] THOUGHTS ON RELIEVING APRS CONGESTION ON 144.39
bruninga at usna.edu
Sat Nov 20 07:32:15 CST 2010
> In East Tennessee, we found that our problem
> was too many packets from outside of the area.
> Here's ... how we addressed this situation...
[limit wide area mountain top digis to 1 hop]
Yes! You nailed it.
And because of your reminder, I'm going back to my aprs.org diagram and change it to only support one-hop on all inputs. That is what I was thinking, but for simplicity I put down WIDEn-N. Ill change that to WIDE1-1 or WIDE2-2.
Afterall, if this is at a super site, worth all the effort to add alternate inputs, then it certainly covers a wide area...
> The digi's in East Tennessee typically have a
> HUGE coverage area because of our mountainous
> terrain. Without restricting what they digi on,
> we frequently see packets from hundreds of
> miles away (i.e. from Florida, Arkansas, Ohio,
> Missouri, etc.) in our area. These packets are
> needless and reduce the reliability of the
> local area packets.
> The ... Kantronics KPC3+ [are] configured:
> UIDIGI ON TN,WIDE1-1,WIDE2-2
> UITRACE TN,30
> UIFLOOD TEMP,30,ID
> This... provides one or two hops to any station
> in the area using recommended paths. We have
> found that this is enough to facilitate local
> situational awareness, getting local traffic
> into an iGate and local messaging.
> We do not digi on WIDE2-1; that is generally
> used in conjunction with WIDE1-1 as in
> WIDE1-1,WIDE2-1. We digi on WIDE1-1, then let
> the WIDE2-1 die or possibly be picked up by
> a digi outside of the area.
> ... in our area with our very wide area digis
> a single hop is sufficient for 90%+ of the
> day-to-day traffic and limiting in such a way
> has improved the efficiency of our local network.
> We also...[can use] TNn-N if we need wider
> coverage and support TN to take advantage
> of some older TNCs in the area which we have
> not been able to get updated to the new
> WIDEn-N paradigm.
> ... it works very well and has dramatically
> reduced the number of out-of-state packets
> we hear in our area and has greatly improved
> the reliability of our local network.
> William McKeehan
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