In ADSL, the Asymmetrical just means that the download and upload speeds 
aren't necessarily the same.  In SDSL, they are the same (or the path is 
symmetrical).

It's about time I put my Newton's Telecom Dictionary to use :)

Michael Dipperstein wrote:
> I'm pretty sure Harold is correct.  In telephony, ADSL is Asymmetric
> Digital Subscriber Line (sometimes Loop) and SDSL is Symmetric Digital
> Subscriber Line (sometimes Loop).
>
> -Mike
>
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Tamas Rudnai
> Sent: Wednesday, March 28, 2007 10:43 AM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Some get the interesting jobs ...
>
> Yes, ADSL is for async SDSL is for sync.
>
> Tamas
>
> On 3/28/07, Harold Hallikainen <harold@hallikainen.org> wrote:
>   
>>> While gargoyling for some info on isolated fet drive as a follow on
>>>       
> from
>   
>>> the
>>> discussion the other day, I came across this poster.
>>>
>>> http://www.mbari.org/staff/coletti/docs/towfish_os.pdf
>>>
>>>       
>> Yep, that's pretty neat! The Monterey Bay Aquarium is north of me
>>     
> about
>   
>> 100 miles or so. We go by there every year or so to see what's new.
>>     
> One
>   
>> thing in the text was:
>>
>> "cable. One pair of conductors are used to deliver AC
>> (alternating current) power and another pair to establish
>> network connectivity via an SDSL (Synchronous Digital
>> Subscriber Line) connection."
>>
>> Doesn't SDSL stand for SYMMETRIC digital subscriber line?
>>
>> Harold
>>
>>
>>
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>
>   

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