Even simpler: it's the T-shaped BNC coax adapter you use to connect a PC to the coax network. If you don't have a BNC/coax input on your PC any more, you could use a simple (older?) SOHO office hub that features both, BNC and RJ45 connectors, plug the T into BNC and your PC into one of the RJ45 connectors.
10base2 (coax ethernet) and DOCSIS (cablemodem) are two different L1 transports.
Hacking the firmware on your old Motorola Cablemodem is the best bet. ~Mike. _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
