Date: Mon, 22 Jan 2001 22:50:04 -0600 From: "Michael C . Wu" <keichii@iteration.net> To: Greg Lehey <grog@lemis.com> Cc: "Michael C . Wu" <keichii@iteration.net>, Brad Knowles <brad.knowles@skynet.be>, freebsd-chat@FreeBSD.ORG Subject: Re: GSM vs. CDMA (was: VCD (was Re: cvs commit: src/sys/dev/ata atapi-cd.c)) Message-ID: <20010122225004.A80596@peorth.iteration.net> In-Reply-To: <20010123104615.B16006@wantadilla.lemis.com>; from grog@lemis.com on Tue, Jan 23, 2001 at 10:46:15AM %2B1030 References: <200101211447.f0LElEk04073@mobile.wemm.org> <KAECKEJJOLGHAFGGNIKMAELICAAA.res02jw5@gte.net> <20010121145018.A73989@citusc17.usc.edu> <20010121165422.A44505@peorth.iteration.net> <v04220821b691222656eb@[10.0.1.2]> <20010122103136.L93049@wantadilla.lemis.com> <20010121182033.C44819@peorth.iteration.net> <20010123104615.B16006@wantadilla.lemis.com>
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On Tue, Jan 23, 2001 at 10:46:15AM +1030, Greg Lehey scribbled: | On Sunday, 21 January 2001 at 18:20:33 -0600, Michael C . Wu wrote: | > On Mon, Jan 22, 2001 at 10:31:36AM +1030, Greg Lehey scribbled: | > I tend to think of them as being comparable to TCP vs. UDP. | > Believe it or not, the OSI 7-layer useless model applies | > to mobile phones and telecomm too. We have counterparts | > to TCP/IP OSI model in the mobile comm OSI model. | > | > Why do I think that OSI model is useless? To paraphrase/quote | > wpaul: "Nobody in the real world uses the OSI model, it was created | > just so that professors and other people can make paper tests that | > have no importance other than making students memorize useless | > things." | | I think this is a one-sided viewpoint. Yes, the OSI model is deeply | flawed: when they designed it, they didn't have a good understanding | of what layers would really make sense. But the concept, rather than | the implementation, is still very useful. I have to agree with you, the layering could be done much better. I like to think of TCP/IP as an dependency tree more than a layer. | >>> The same will happen in the US, as 3G takes over from existing | >>> TDMA, CDMA, AMPS/NAMPS networks, but at least many of those | >>> companies will have relatively less money thrown down the TDMA hole | >>> which they then have to completely write off. | >> | >> Don't forget that they have recently started introducing GSM into the | >> USA. I've found that it works better than the CDMA service. This has | >> nothing to do with the relative merits of the technology, but with the | >> fact that the service providers learnt that their cell placement was | >> too sparse for the old analogue/*DMA network, and they placed them | >> closer for GSM. | > | > Yes, I recently switched from AT&T PCS to Voicestream GSM in America. | | What kind of PCS were you using before? And how's the GSM coverage in | Austin? AT&T CDMA PCS. GSM coverage in Austin is quite good. The best coverage is still AT&T's PCS, but Voicestream GSM only lacks coverage slight compared to AT&T. I was surprised that Voicestream had better coverage than Verizon/MCI/Sprint. I still owe you that dinner, when are you coming to Austin? 8) -- +------------------------------------------------------------------+ | keichii@peorth.iteration.net | keichii@bsdconspiracy.net | | http://peorth.iteration.net/~keichii | Yes, BSD is a conspiracy. | +------------------------------------------------------------------+ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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