[lug] sdsl / adsl

[B. Allyn]

Yeah, but is RADSL a synchronous flavor of DSL? I understood ADSL throughput
as being your max bandwidth, up or down. So, if you're pushing 256k on an
ADSL line, you might get 128k up and 128k down, or whatever, but that's
it--totaling at 256k (since it's async).

On SDSL, on the other hand, you'll get 256k up AND down simultaneously, for
"true" throughput of 512k (since it's a synchronous connection). At least,
that's how I understand it from my SDSL provider...

All of the USWest circuits I've seen are RADSL, including the circuits into
other ISPs, and almost all of them end up running at 640k down, 256k up. I
have seen some with really weak signals turned down to 256/128, though.

Allyn

on 1/3/00 2:40 AM, Nate Duehr at nate at natetech.com wrote:

> In ADSL, your upload and download speeds do not necessarily match.  US
> West's 256 ADSL usually is 256 down (toward you) and 128 up, if I
> remember correctly.
> 
> SDSL is usually the same both directions.
> 
> There's also a flavor of ADSL called RADSL (Rate-Adaptive DSL) which is
> actually what most providers are using.  It simply means that the DSL
> line will "adapt" to whatever line length it's plugged into.
> 
> SDSL and RADSL can both be configured (I believe...) to be Symmetric
> like SDSL.
> 
> In some of my original posts I said I had SDSL, but it turns out that
> they actually installed me with RADSL and symmetric bandwidth.  They
> also let the DSL router/modem "train up" to its highest speed during the
> installation to see what I could get later if I want to pay for it.  It
> went to 764K/s (and boy was that nice for a few minutes!) symmetric, so
> If I ever need that kind of bandwidth I can get it.  (Nice to know.)
> 
> Overall, I really love the new RADSL service and would do it again in a
> New York Minute.  :)
> 
> On Mon, Jan 03, 2000 at 12:55:32AM -0800, bill ehlert wrote:
>> 
>> 
>> --- "Ian S. Nelson" <nelson_ at attglobal.net> wrote:
>>> Neal McBurnett wrote:
>>>> On Dec 28, 10:31, Moore, Kevin L
>>> <klmoore at ball.com> wrote:
>>>>> Just found out that Flashcom can give me
>>> sdsl at a reasonable price
>> 
>> **  i assume sdsl is "synchronous dsl", but i don't
>> think i've ever heard of it before.
>> 
>> could anyone say a few words about the differences
>> [ other than the obvious  :) ], reliability,
>> availability, costs, stuff like that . . . ?
>> 
>> 
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> -- 
> Nate Duehr <nate at natetech.com>
> 
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