[aprssig] The Current Meaning of WIDEn-N (incorrect)
Stephen H. Smith
wa8lmf2 at aol.com
Mon May 19 14:26:08 EDT 2014
On 5/19/2014 1:47 PM, Robert Bruninga wrote:
> With apologies…, unfortunately the below information is wrong.
> ØToday, effectively the first "n" of WIDEn-N now indicates whether or not a
> home fill-in digi can potentially be used for the first relay hop of a
> multi-hop path.
> While that may be an “effective interpretation” of what people observe, it is
> not correct.
HOW is it "not correct"? If you start the path with WIDE1-1, you will use a
home WIDE1-1 digi, if one is available. If there isn't one around, and there
IS a true wide around, it will respond. Or in the Tassajera / SLO case where
most likely one of each are within range, BOTH will respond simultaneously.
>>If the first "n" is a "1", then *EITHER* a home fill-in digi --OR-- a
> high-level true wide can handle the hop.
>>If the first "n" is other than "1", then ONLY a true wide will respond to and
> handle the hop.
> Simply not true. The first “n” is the original N hop when the packet was
So how does this invalidate my statement?
A "dumb" home digi TNC is going to respond exclusively to "WIDE1-1". It will
not respond to any path elements (a.k.a. "clauses" in my usage) that are
anything other than exactly WIDE1-1.
On the other hand, true wides, with functional n-N decrementing,
firmware/software will respond to any combination of "n" and "N" values in
Thus effectively today, WIDE1-1 says "let home digis be involved in the first
hop digipeating", while any other value of "n" and/or "N" in WIDEn-N
effectively says "home fill-digis stay out of this matter".
The exception (which causes all this confusion) is the special
> “WIDE2-1” which is simply a cheating way to get ONE HOP without keying up all
> surrounding fill-in WIDE1-1 digis.
"Cheating" on the WIDE2-n path has nothing to do with home digis not responding
to anything except "WIDE1-1".
For example, if I want to transmit a
> one-hop packet, but I don’t want to bring up my neighbors WIDE1-1 digi, and the
> one that might be in a neighboring car (heaven forbid), I would use the single
> hop path of WIDE2-1. Which has always been a special case of a WIDEn-N packet
> only intended to go one hop and without bringing up all the old-fill-in-digis
> that can only operate on “WIDE1-1”.
>>Today the *total* number of digipeater relay hops requested by the user is the
> sum of the first N of the first clause (normally "1") and the first N of the
> second clause (typically "2"), minus any "pre-decrementing" indicated by the
> second "N" of a clause initially being smaller than the first. I.e.
> Simply not true.
How is this "not true"????
If you use the standard WIDE1-1,WIDE2-1 path, you will (potentially, if the
digis exist) one hop from the clause "WIDE1-1" and one hop from "WIDE2-1" for a
total of two; i.e. "n=1" + "n=2" minus the "pre-decrement" of WIDE2-1 = 2
WIDE1-1,WIDE2-2 would potentially yield THREE hops; i.e. "n=1" + "n=2" = 3
> ØThis is why WIDE1-1 is completely discouraged in the greater Los Angeles area.
> Should not be so.
You've been saying "NO" for 15-20 years now, but it is still SO.
> ØThe basin is completely rimmed with mountain-top "super-wides" that can hear
> and digipeat everyone everywhere on a single hop, without the help of home
> stations. The recommended path is "WIDE2-2" only which the local digis
> completely consume in a single hop. When you travel out of the greater LA area
> (i.e. over the Tejon or Cajon passes or beyond SBA on the 101), you
> "automagically" start getting two hops from mountain tops that process
> "WIDE2-2" normally; i.e. as two hops.
> In SoCal and anywhere else where the Aloha circle is entirely contained within
> a single hop, it is the responsibility of the digi owners to implement 1-hop
> enforcement so that all mobiles don’t have to change their paths depending on
> where they dirve!
Which is exactly what they are effectively doing. The WIDE2-2 path is trapped
in the local digis in a manner similar to home WIDE1-1 fill-ins; i.e. a literal
alias of "WIDE2-2" with no n-N decrementing stuff. When you go "over the
hill" (literally) to central CA or the Mohave and come into the range of digis
that DO do the n-N decrementing thing, you get two hops.
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