Koos van den Hout (koos+newsposting@kzdoos.xs4all.nl) 20 Feb 2005 19:10:09 GMT

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Robert Bonomi <bonomi@host122.r-bonomi.com> wrote: > As "commonly deployed", SDSL has same speed up and down, and ADSL has > mis-matched (almost invariably higher in the 'down' direction) speeds. > However, I have had "symmetric rate" ADSL, and "Asymmetric rate" SDSL, > service, at various times, from various providers. Not terribly > common, but such services do/did exist. :) ADSL has, and I guess SDSL has it too, a difference between 'the possible speed of the phone line' and 'the speed the *dsl provider programs on it'. For example, my phone line has the following: Downstream Attainable line rate : 8112 kbit/sec Attainable Atm rate : 7680 kbit/sec Used line rate : 3600 kbit/sec Fast used Atm rate : 3200 kbit/sec Upstream Attainable line rate : 968 kbit/sec Attainable Atm rate : 864 kbit/sec Used line rate : 856 kbit/sec Fast used Atm rate : 768 kbit/sec (see http://idefix.net/~koos/speedtouchgraph/ for how I make my adsl modem tell me this and other details about the phoneline) The provider could for example program a profile with 768 kbit up/down. Koos van den Hout, PGP keyid RSA/1024 0xCA845CB5 via keyservers Koos@kzdoos.xs4all.nl or DSS/1024 0xF0D7C263 -?) Fax +31-30-2817051 Camp Wireless, wireless Internet access /\\ http://idefix.net/~koos/ at campsites http://www.camp-wireless.org/ _\_V

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