They say it must have been purchased from the manufacture or it wont work, they all were at one point.....
If you get it and they dont let you add it IIRC you can take legal action. The requirement by the FCC makes it mandatory that they let you use equipment you got elsewhere (with limitations), such as cable modems and boxes, phone modems etc. Thats why you can use a tivo box and your own modem to name a few.
For arguments sake with them just say you bought it from the cable one online store link (»yourbroadbandstore.com/
or specifically »www.yourbroadbandstore.com/solut···ableone/
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