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

Re: ADSL and SDSL?

Dean (
17 Feb 2005 11:10:38 -0800

Robert Bonomi wrote:

> In article <>,
> T. Sean Weintz <> wrote:

>> Robert Anderson wrote:

>>> Do you more reliably get the higher bandwidth with SDSL than with
>>> ADSL?

>>> For example, is the CIR higher with SDSL?

>>> We are a very small business using VoIP and our connection is
>>> ADSL. People have problems hearing us but not the other way around.

>>> We were thinking of switching from ADSL over to SDSL, to see if that
>>> helps.

>>> Robert Anderson

>> ADSL is asymmetrical

> *not*necessarily*

>> SDSL is symetrical

> *not*necessarily*

> 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. :)

Can you elaborate? I thought the 'A' in ADSL and the 'S' in SDSL stood
for asymmetrical and symmetrical respectively. What you're describing
seems to negate that doesn't it? What am I missing?

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