Cable Modem question

What’s the practical difference between DOCSIS 1.0 and 2.0?

DOCSIS 1.0 and 1.1, went a long way towards improving the opportunities for cable operators to bring new revenue-generating services online, some significant challenges still remain — primarily surrounding the lack of available bandwidth in the return (also referred to as “upstream”) channel.

These challenges have been addressed by the industry in DOCSIS 2.0, the latest version of the cable data specification, which enables symmetric upstream and downstream bandwidth by taking advantage of advanced physical layer (PHY) technologies.

Partial quote from an article here