[GeoStL] Re: Branson Caching

  • From: "Jon Mertz" <jemertz@xxxxxxxxx>
  • To: geocaching@xxxxxxxxxxxxx
  • Date: Fri, 15 Jun 2007 09:41:38 -0500

You forgot to run it down the networking stack. TCP header, IP addressing,
Physical (MAC) addressing, etc... This isn't the typical ring or star
topolgy, but some sort of a strange flat (or possibly hilly) topology.
Collision avoidance/detection would not be necessary as with some other
wireless technologies (unless the signalers are close to being in a line)
but since senders and receivers need not necessarily be physically located
at the same spot, this may not be a concern until congestion or smog becomes
a serious issue. Also remember that with a smoke signal, one need not stick
to binary encoding. Trinary or Ternary may be possible by varying the
lengths of the puffs and/or gaps, and possibly even the shape of the puff
(smoke rings, anyone?).

If they can do TCP/IP via carrier pigeon
http://www.ietf.org/rfc/rfc1149.txtwe can do it via smoke signals!

On 6/14/07, Robert Oelschlaeger <roelschlaeger@xxxxxxxxx> wrote:


For the entire file, or for each record of say 64 bytes, like a Motorola
S-record file?

8-bit, 12-bit 16-bit or 32-bit? Which polynomial? CCITT-16? CCITT-32?
preset to all 1's first? complemented at the end?

Single-error detecting? Single-error correcting, double-error detecting
Hamming code? That would add three bits per byte, I'd guess.

Adding just a single parity bit to each character add about 10%, so we
would have 4.3860 years.

Adding the file checksum would be negligibly different. Adding a 16-bit
CRC per line of 64 bytes adds 3.125%

Grand total is about 4.5 years.

Any other requests?

Bob (aka roelsch)



On 6/14/07, Enormous Richard <_rnx_@xxxxxxx> wrote:
>
> -
>
> very nice 8^)
>
>
>
> what if i wanted to add a redundancy checksum
>
>
>
>
> ------ Original Message ------
> *Received: *Thu, 14 Jun 2007 10:16:59 PM EDT
> *From: *"Robert Oelschlaeger" <roelschlaeger@xxxxxxxxx>
> *To: *geocaching@xxxxxxxxxxxxx
> *Subject: *[GeoStL] Re: Branson Caching
>
>
> 3.9873 years if you're talking 1M = 1048576 bytes :-)
>
> Bob (aka roelsch)
>
>  On 6/14/07, Robert Oelschlaeger < roelschlaeger@xxxxxxxxx > wrote:
> >
> > I get 3.8026 years, figuring four seconds per bit, 10 bits
> > (start/stop/8 data -- this is serial asynchronous, after all) per byte, and
> > 365.25 days per year:
> >
> > octave:1> rate=0.25
> > rate = 0.25000
> > octave:2> bytes=3e6
> > bytes = 3000000
> > octave:3> bits=10*bytes
> > bits = 30000000
> > octave:4> seconds = bits/rate
> > seconds = 120000000
> > octave:5> hours = seconds/3600
> > hours =  3.3333e+04
> > octave:6> days = hours/24
> > days = 1388.9
> > octave:7> years = days/365.25
> > years = 3.8026
> > octave:8>
> >
> > On 6/14/07, HoosierDaddy <_rnx_@xxxxxxx > wrote:
> > >
> > > -
> > > i wonder how long it would take to send 3Mb via smoke signals
> > >
> > > ------ Original Message ------
> > > *Received: *Thu, 14 Jun 2007 08:06:39 PM EDT
> > > *From: *"Robert Oelschlaeger" <roelschlaeger@xxxxxxxxx>
> > > *To: *geocaching@xxxxxxxxxxxxx
> > > *Subject: *[GeoStL] Re: Branson Caching
> > >
> > >
> > > Must be all those folks trying to escape the chain of being shackled
> > > to their high speed DSL :-)
> > >
> > > On 6/14/07, Tim and Pam < timpam2mocachers@xxxxxxxxxxxxx > wrote:
> > > >
> > > >  I wish we could leave our house unlocked. Washington is starting
> > > > to grow like St.Charles did 20 years ago. It is scary to look
> > > > around at the changes made in just the last 6 months L
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Tim
> > > >
> > > >
> > > >
> > > > www.tueltzen.smugmug.com
> > > >   ------------------------------
> > > >
> > > > *From:* geocaching-bounce@xxxxxxxxxxxxx 
[mailto:geocaching-bounce@xxxxxxxxxxxxx]
> > > > *On Behalf Of *HoosierDaddy
> > > > *Sent:* Thursday, June 14, 2007 6:38 PM
> > > > *To:* geocaching@xxxxxxxxxxxxx
> > > > *Subject:* [GeoStL] Re: Branson Caching
> > > >
> > > >
> > > >
> > > > we all make choices that have consequences. just keep in mind all
> > > > the privlidges that living in Washington provides to keep your minds 
off the
> > > > other troubles. i bet you can leave you front door unlocked without the 
fear
> > > > of a crackhead walking through it and stealing your melba toast. No DSL 
is a
> > > > small price to pay for that kind of peace of mind.
> > > >
> > > >
> > > > eocaching Missouri Caches Scheduled to be Archived 
http://tinyurl.com/87cqw
> > > >
> > > >  **************************************** For List Info or To make
> > > > _ANY_ changes, including unsubscribing from this list, click ----->
> > > > //www.freelists.org/list/geocaching Missouri Caches Scheduled
> > > > to be Archived http://tinyurl.com/87cqw
> > > >
> > >
> > >
> > >
> > >  **************************************** For List Info or To make
> > > _ANY_ changes, including unsubscribing from this list, click ----->
> > > //www.freelists.org/list/geocaching Missouri Caches Scheduled
> > > to be Archived http://tinyurl.com/87cqw
> > >
> >
> >
>
>
>  **************************************** For List Info or To make _ANY_
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> Archived http://tinyurl.com/87cqw
>

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