What Internet Cable Provider?

Several.

Copy and paste this url and remove any spaces.

http://www.google.com/search?hl=en&ie=UTF8&oe=UTF8&q=Internet+Cable+provider+can+use+the+3COM+3CR29210+Cable+External+Modem

There are quite a few that came up, and it depends on where you live as to what ISP you can have.
Your best bet is to first check what ISP cable providers exist where you live first then check to see which of them supports your modem, if any.

HTH
nikki

Cable? Normally your local CATV provider. Note: most cable co's are DOCSIS 1.1 compliant as are new external boxes. If Tier 1 tech support gives you any hassel, like mine tried to do me: Hang up and call the Business Office and ask for the HSD Manager. I've found that if provisioning takes more than just a couple clicks, they act like they can't do it. Any DOCSIS 1.1 compliant modem is compatible with their system, they just want you to buy or continue renting theirs.

Good Luck!!