| Basically, the set top box spits out Ethernet. As long as the device works with Ethernet, you should be fine. NTL/Telewest used to register MAC addresses, and if they didn't have a note of the MAC address, they wouldn't allow you to communicate. A number of the ethernet 'NAT' boxes (aka routers) supported a feature called "MAC cloaning", where they'd take the MAC address of your PC, and present that to NTL/Telewest, thus bypassing the restriction.
Danrok: some digital cable boxes have an ethernet port on the back.
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