I have that router on NTL...
Assuming you already have Ethernet connevtivity - laboured over rather poorly in the manual...
1. Connect to the router ...
http://192.128.2.1/ (using the default account & password, unless already changed)
2. Use "Quick setup" Select the timezone, and give it a timeserver
http://homepage.ntlworld.com/robin.d.../timesync.html
194.117.152.85 is the addreess for ntp.blueyonder.co.uk
If you switch the router off, I'd suggest using the UBR address instead, as it will be acessed each time you restart it.
3. On "Next", select Broadband type as "Cable Modem" and then you should be able to clone the adapter MAC address (saves registering a new mac address).
That should be all the setup that's needed
PS. I've put mine onto 3.01 firmware, though it seemed to be ok on original 2.97
I use the UBR address for timeserver, even though it's almost an hour out!