31 Years of the Digest ... founded August 21, 1981
The Telecom Digest for August 21, 2012
====== 31 years of TELECOM Digest -- Founded August 21, 1981 ======
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Date: Mon, 20 Aug 2012 04:27:29 +0000 (UTC) From: email@example.com (Garrett Wollman) To: firstname.lastname@example.org. Subject: Re: Converting Lat/Long from degrees-minutes-second to decimal degrees Message-ID: <email@example.com> 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 firstname.lastname@example.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" <email@example.com> To: firstname.lastname@example.org. Subject: Re: AT&T sets deadline for 2G sunset in 4 years Message-ID: <email@example.com> >> 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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