Date: Tue, 23 Jan 2001 02:09:00 -0000 (GMT) From: Duncan Barclay <dmlb@dmlb.org> To: Greg Lehey <grog@lemis.com> Cc: freebsd-chat@FreeBSD.ORG, Kris Kennaway <kris@FreeBSD.ORG>, Brad Knowles <brad.knowles@skynet.be>, keichii@peorth.iteration.net, Terry Lambert <tlambert@primenet.com> Subject: Re: GSM vs. CDMA (was: VCD (was Re: cvs commit: src/sys/dev/ata Message-ID: <XFMail.010123020900.dmlb@computer.my.domain> In-Reply-To: <20010123122223.G16170@wantadilla.lemis.com>
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On 23-Jan-01 Greg Lehey wrote: > On Tuesday, 23 January 2001 at 1:40:18 +0000, Terry Lambert wrote: >>>> In case this wasn't obvious: don't expect your GSM phone from >>>> outside the US to work in the US, Canada, or Mexico. The US >>>> GSM system uses a different set of frequencies, so unless your >>>> phone is multifrequency as well as multimode, it won't work. >>> >>> You've jumped into this discussion relatively late (I hope). We've >>> already discussed this, along with the frequencies. >> >> Yes, I saw that. I was more thinking about who you would be >> pissing off if you turned one of these things on in the U.S. >> near a military base. > > Hmm. Yes, I wonder what would happen. I wonder how long it would > take them to work out what was going on. A GSM phone will not transmit anything until it find a beacon being transmitted by a basestation. There is a scanning procedure that looks at all possible frequencies in use by all GSM networks (in a given band), followed by a timing acquistion, followed by reading of various informational packets transmitted in the beacon. The whole procedure is documented in the GSM 05.08 and 05.10 standards. The US military would not know anyone was using a phone because the phone would just not do anything apart from saying "no network". > Greg 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
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