Async vs sync

Hi all

I was going through the official cert guide by Odom and noticed that HDLC is down as supporting synchronous links only. This got me thinking. 

Now if ASDL is asynchronous and SDSL is synchronous, what does SDSL use? 

I've only seen ATM used with ADSL and the last time I touched SDSL was a long time ago so cannot remember a thing. 

Also, there seems to be conflicting information about whether ADSL is actually synchronous or whether it's asynchronous. Any ideas?

I know this isn't 100% R&S but going through the material gave me the question. 

Thanks. 

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