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Article #296Re: Dial-up Modem Speed of 56 Mbps? - Can't believe anyone took this seriously...
From: Floyd L. Davidson
Date: Wed, 25 Apr 2007 21:26
Date: Wed, 25 Apr 2007 21:26
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"Noozer" <dont.spam@me.here> wrote: > >... and there is one other item to take into consideration here. A 56kbit >modem will ONLY run faster than 33.6kbit if the answering end of the system >is digital. It can't be an analog phone line, etc. This means you'll never >get 56kbit dialing between PC modems. What is required is that there be only one codec in the connection. It makes no difference which side answers and which side originates. However, your conclusion that 56Kbps cannot happen "dialing between PC modems" is correct, because there is necessarily a requirement for two codecs if each "PC modem" is a modem connected to a POTS telephone line. That is a function of the POTS lines, not of a "PC modem", unless of course you define it to be a modem that only uses a POTS line, as opposed, for example, to being an ISDN modem). That's obviously a lot of hair splitting... :-) The "analog phone line" is not actually used as an analog phone line when there is only one codec. Instead the codec becomes a digitial level shifting mechanism (which converts digital PCM to digital PAM, and there is nothing analog about the data! If it is, however, decoded by a 2nd codec... it becomes a "quasi-analog" signal, and can no longer be used in any way that will produce a bit rate approaching 56Kbps. -- Floyd L. Davidson <http://www.apaflo.com/floyd_davidson> Ukpeagvik (Barrow, Alaska) floyd@apaflo.com
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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!news4.google.com!newshub.sdsu.edu!sn-xt-sjc-02!sn-xt-sjc-06!sn-post-sjc-01!supernews.com!corp.supernews.com!not-for-mail From: floyd@apaflo.com (Floyd L. Davidson) Newsgroups: alt.comp.hardware,comp.dcom.modems,microsoft.public.windowsxp.network_web,24hoursupport.helpdesk,microsoft.public.win2000.networking Subject: Re: Dial-up Modem Speed of 56 Mbps? - Can't believe anyone took this seriously... Date: Wed, 25 Apr 2007 13:26:13 -0800 Organization: __________ Message-ID: <87vefk87t6.fld@barrow.com> References: <1177378238.361891.73650@y5g2000hsa.googlegroups.com> <Xns991C97AB1B12thanexit@66.250.146.158> <mVkXh.121595$DE1.37097@pd7urf2no> <1177430988.571457.266060@u32g2000prd.googlegroups.com> <462E51B4.C1DDE988@yahoo.com> <Xns991CA2F8F87Athanexit@66.250.146.158> <462E8321.182A78CC@yahoo.com> <Xns991CEB71086B0thanexit@66.250.146.158> <E5PXh.126796$DE1.126581@pd7urf2no> User-Agent: gnus 5.10.6/XEmacs 21.4.15/Linux 2.6.19 Cancel-Lock: sha1:4nBvXmCpNYOhfOi1/R3cxsiAhRo= MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Complaints-To: abuse@supernews.com Lines: 31