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Article #305Re: Dial-up Modem Speed of 56 Mbps? - Can't believe anyone took this seriously...
From: Strings
Date: Wed, 25 Apr 2007 10:45
Date: Wed, 25 Apr 2007 10:45
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2488 bytes
> AFAIK, ALL modems except the earliest models ever (300 baud > etc.) use compression to achieve their "rated speeds", and no 56 > modem can process anything at a faster speed than 53 or 56 (I > don't know which is correct - see thread - and they're > practically the same anyway). > And it achieves that speed by compression. AFAIK, it's just a > 14.4 or 28.8 (my knowledge fails me here) modem with much better > compression algorithms and some newer components. this is clearly wrong. there are multiple bits per baud in faster modems. for instance the 9600 baud used for PCs used quadrature modulation. it's pretty clear, that on a clean analog line you can get at least 30 kbps. this is due to the bandwidth and SNR, and the Shannon theorem sets an upper bound on line speed. 56k modems go well past 56 kbps on material which can be compressed heavily.
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X-Google-Thread: f5f89,aa6fae6c35701086 X-Google-Thread: 10beba,aa6fae6c35701086 X-Google-Thread: 108b8a,aa6fae6c35701086 X-Google-Thread: faa3c,aa6fae6c35701086 X-Google-Thread: 10e11e,aa6fae6c35701086 X-Google-Attributes: gidf5f89,gid10beba,gid108b8a,gidfaa3c,gid10e11e,public X-Google-Language: ENGLISH,ASCII-7-bit Path: arc1-ca.pugleaf.net!g2news1.google.com!news3.google.com!out02b.usenetserver.com!news.usenetserver.com!in02.usenetserver.com!news.usenetserver.com!news-out.octanews.net!indigo.octanews.net!authen.yellow.readfreenews.net.POSTED!not-for-mail From: "Strings" <strings@example.net> Newsgroups: alt.comp.hardware,comp.dcom.modems,microsoft.public.windowsxp.network_web,24hoursupport.helpdesk,microsoft.public.win2000.networking References: <1177378238.361891.73650@y5g2000hsa.googlegroups.com> <Xns991C97AB1B12thanexit@66.250.146.158> <mVkXh.121595$DE1.37097@pd7urf2no> <1177430988.571457.266060@u32g2000prd.googlegroups.com> <462E51B4.C1DDE988@yahoo.com> <Xns991CA2F8F87Athanexit@66.250.146.158> Subject: Re: Dial-up Modem Speed of 56 Mbps? - Can't believe anyone took this seriously... Date: Wed, 25 Apr 2007 05:45:19 -0500 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-RFC2646: Format=Flowed; Original Lines: 19 Message-ID: <462f30c6$0$97226$892e7fe2@authen.yellow.readfreenews.net> Organization: Read Free News NNTP-Posting-Date: 25 Apr 2007 05:43:19 CDT X-Trace: DXC=9N]KCMBB]1kHO2o@UV3j1m]AGWjF5PjPi465Ue@WB_5ogCao\=0a9Tj^[31m`oXGjn[n\=GNK177b>\a=9gc]mKcO0X?[?Ph7ab