31 Years of the Digest ... founded August 21, 1981
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The Telecom Digest for August 21, 2012
Volume 31 : Issue 200 : "text" Format
====== 31 years of TELECOM Digest -- Founded August 21, 1981 ======
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Date: Mon, 20 Aug 2012 04:27:29 +0000 (UTC)
From: wollman@bimajority.org (Garrett Wollman)
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: Converting Lat/Long from degrees-minutes-second to decimal degrees
Message-ID: <k0sebh$ldi$1@grapevine.csail.mit.edu>
In article <E1T3Iqi-0003JI-1V@telecom.xen.prgmr.com>,
<bill@horne.VALID-IF-THIS-IS-ELIDED.net> wrote:
>Here's a great FCC site that converts Latitude and Longitude in
>Degrees, Minutes, and Seconds to or from Decimal Degrees.
>
>http://transition.fcc.gov/mb/audio/bickel/DDDMMSS-decimal.html
>
Of course, with no disrespect to Dale Bickel, it's also trivial to do
with a calculator.
-GAWollman
--
Garrett A. Wollman | What intellectual phenomenon can be older, or more oft
wollman@bimajority.org| repeated, than the story of a large research program
Opinions not shared by| that impaled itself upon a false central assumption
my employers. | accepted by all practitioners? - S.J. Gould, 1993
Date: 20 Aug 2012 15:58:56 -0000
From: "John Levine" <johnl@iecc.com>
To: telecomdigestmoderator.remove-this@and-this-too.telecom-digest.org.
Subject: Re: AT&T sets deadline for 2G sunset in 4 years
Message-ID: <20120820155856.64548.qmail@joyce.lan>
>> The next generation, LTE, is indeed CDMA.
>Thanks! Time Division only has so many voice slots per channel. CSMA is
>more like CSMA/CD in computer networks. It detect collisions and
>therefore allows a slightly better capacity than TDMA but with the
>caveat that you don't get a guaranteed time slot.
Not really. CSMA is spread spectrum, pseudo-randomly splatting each
phone's signal across a group of channels. Other phones' signals
don't appear as collisions, they appear as noise, but in a well
designed system the perceived noise is low enough that each station
can recover the signal intended for it.
The whole thing is awfully close to magic. I've gone through the math
and I see how it works, but it still makes little intuitive sense.
R's,
John
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