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Article #254Re: Increasing the speed of dial-up to that of cable -- possible?
From: Reed
Date: Tue, 14 Aug 2007 02:15
Date: Tue, 14 Aug 2007 02:15
35 lines
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2886 bytes
kony wrote: > On Mon, 13 Aug 2007 23:33:12 -0000, Radium > <glucegen1@gmail.com> wrote: > > >> My question was can Quadrature Modulation and Constellation Modulation >> allow analog dial-up modems to have the same speed as cable modems? >> Not any kind of DSL, just analog. >> >> Can the analog phone line make use of the above two modulations >> schemes to achieve cable-modem speeds at the voiceband frequencies >> used by the analog dial-up modem? > > The answer is no, it can't. Plain old twisted pair bell > wire cannot retain the analog signal at the sufficiently > high frequencies necessary to come anywhere near ISDN, ADSL, > let alone *cable* broadband speeds. > > If you had bothered to do some research you would know this. > > I recommmend you do some basic, prerequisite learning of > basic core technologies before trying to bite off more than > you can chew. The building blocks of education are not > trying to invent some new thing when you don't even know how > the old things worked. Even worse than the wire (local loop) is the analog bandwidth restriction of 4Khz when a dial connection is carried over any Public Switched Telephone Network(PSTN) via digital T-carrier equipment within a 64K DS-0 channel. (and nearly 100% of calls are carried such today). The "56K V.90" modem is a "hack" that tries to take advantage of such connections. --reed
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X-Google-Thread: f5f89,b5b6cdc0ee657d29 X-Google-Thread: 10beba,b5b6cdc0ee657d29 X-Google-Thread: 108b8a,b5b6cdc0ee657d29 X-Google-Thread: faa3c,b5b6cdc0ee657d29 X-Google-Thread: 10e11e,b5b6cdc0ee657d29 X-Google-Attributes: gidf5f89,gid10beba,gid108b8a,gidfaa3c,gid10e11e,public,usenet X-Google-Language: ENGLISH,ASCII-7-bit Path: arc1-ca.pugleaf.net!g2news2.google.com!news2.google.com!newsfeed.stanford.edu!newsfeed.berkeley.edu!ucberkeley!sn-xt-sjc-03!sn-xt-sjc-08!sn-post-sjc-01!supernews.com!corp.supernews.com!not-for-mail From: Reed <reedh@rmi.net> Newsgroups: alt.comp.hardware,comp.dcom.modems,microsoft.public.windowsxp.network_web,24hoursupport.helpdesk,microsoft.public.win2000.networking Subject: Re: Increasing the speed of dial-up to that of cable -- possible? Date: Mon, 13 Aug 2007 20:15:49 -0600 Organization: Posted via Supernews, http://www.supernews.com Message-ID: <13c242pq75oo62@corp.supernews.com> User-Agent: Thunderbird 1.5.0.12 (Macintosh/20070509) MIME-Version: 1.0 References: <1187045374.227004.161110@g12g2000prg.googlegroups.com> <o7OdnfWy36_zel3bnZ2dnUVZ_rCtnZ2d@comcast.com> <1187047674.362936.294950@g12g2000prg.googlegroups.com> <1187047992.660981.318810@x35g2000prf.googlegroups.com> <a302c3td4nltuf40m0ki8idfhdph06t08o@4ax.com> In-Reply-To: <a302c3td4nltuf40m0ki8idfhdph06t08o@4ax.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@supernews.com Lines: 35