Date: Tue, 14 Oct 2003 09:51:52 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Dag-Erling =?iso-8859-1?Q?Sm=F8rgrav?= <des@des.no> Cc: freebsd-chat@freebsd.org Subject: Re: General Wireless Network Question Message-ID: <3F8C29A8.31FC2085@mindspring.com> References: <20031011212201.GA67228@bishop.my.domain> <p0600205dbbae2c684bd9@[10.0.1.2]> <bmcioj$2pga$1@kemoauc.mips.inka.de> <xzpekxhbek5.fsf@dwp.des.no>
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Dag-Erling Sm=F8rgrav wrote: > naddy@mips.inka.de (Christian Weisgerber) writes: > > Brad Knowles <brad.knowles@skynet.be> wrote: > > > I would say that VOIP over 802.11b could very easily be marginal at= > > > best. > > Oh c'mon, standard telephony voice is 64kbit/s. > = > No. ISDN voice uses up to 64 kbps, but analog POTS uses a lot less, > and standard GSM works just fine with only 9600 bps. FWIW, in the U.S. there are two types of ISDN: the kind you are talking about here, which requires upgraded cards in the CO in order to support out of band signalling, and the kind Veriozon (formerly U.S. West) was selling for a long time which uses in-band signalling and on does 56K, but which lets you use the older Nothern Telecom DV3 switches without needing to upgrade the cards or the wires. Yeah, it's ugly. The 9600 baud in the out-of-band case comes from a separate set of wires (and is "always on", like the GSM). If you're in a Verizon area, you are going to be unlikely to be able to get this for a while (they used to use the 9600 baud switch signalling channel to send email while the 64K/128K connections were down, back in the mid 1990's, as a selling point; they could even light a blinky light on the phone when you had email waiting). -- Terry
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