From owner-freebsd-chat Mon Jan 22 15: 9:16 2001 Delivered-To: freebsd-chat@freebsd.org Received: from mta06-svc.ntlworld.com (mta06-svc.ntlworld.com [62.253.162.46]) by hub.freebsd.org (Postfix) with ESMTP id BF57A37B6BC; Mon, 22 Jan 2001 15:08:55 -0800 (PST) Received: from dmlb.org ([62.253.135.104]) by mta06-svc.ntlworld.com (InterMail vM.4.01.02.27 201-229-119-110) with ESMTP id <20010122225416.MMSK285.mta06-svc.ntlworld.com@dmlb.org>; Mon, 22 Jan 2001 22:54:16 +0000 Received: from dmlb by dmlb.org with local (Exim 3.03 #1) id 14Kpqq-0000lA-00; Mon, 22 Jan 2001 22:54:16 +0000 Content-Length: 1996 Message-ID: X-Mailer: XFMail 1.3 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <20010122103136.L93049@wantadilla.lemis.com> Date: Mon, 22 Jan 2001 22:54:16 -0000 (GMT) From: Duncan Barclay To: Greg Lehey Subject: RE: GSM vs. CDMA (was: VCD (was Re: cvs commit: src/sys/dev/ata Cc: freebsd-chat@FreeBSD.ORG, Kris Kennaway , Michael C.Wu , Brad Knowles Sender: owner-freebsd-chat@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On 22-Jan-01 Greg Lehey wrote: > On Monday, 22 January 2001 at 0:46:38 +0100, Brad Knowles wrote: >> At 4:54 PM -0600 2001/1/21, Michael C . Wu wrote: >> >>> I ask the same questions about why Americans not using >>> GSM but PCS cell phones. (FYI, the reason for using PCS in the U.S. >>> was a pure political reason, none other than America wanting >>> to "lead" the industry. :) ) >> >> Qualcomm invented Code Division Multiple Access (CDMA), the >> superior digital cell phone technology that is the basis for all 3G >> projects around the world. CDMA is supplanting TDMA in the US, >> because it allows you to carry more calls in the same amount of >> frequency bandwidth than TDMA, the previous digital technology. >> >> Anybody that has to replace TDMA technology with CDMA technology >> winds up pretty much completely replacing the entire network they >> built, which is why it's still taking time to make this conversion in >> the US. > > Hmm. This doesn't tie in with what I've been told by people in the > business of developing the equipment. According to my information, > the reason they took CDMA in the US was because it *was* easier to > upgrade from analogue to TDMA to CDMA. > >> However, Europe made the "leap" to TDMA technology in GSM, before >> CDMA existed -- standard AMPS/NAMPS style analog cell phone >> technology had been stretched beyond its limits, and they had no >> choice but to go digital. When Europe was developing GSM back in the early 80's CDMA was not a proven technology for cellular and it is locked up by too many patents with one single company (PS Guess why Ericsson bought significant chunks of Qualcomm a while back). BTW The company I work for has jsut joined the 4G definition groups ;-). Duncan --- ________________________________________________________________________ Duncan Barclay | God smiles upon the little children, dmlb@dmlb.org | the alcoholics, and the permanently stoned. dmlb@freebsd.org| Steven King To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message