TELECOM Digest OnLine - Sorted: Re: ADSL and SDSL?

Re: ADSL and SDSL?

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

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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