Erm pay a second subscription for the internet as that is the only way to have 2 SACMs working in the same house. Using a box off the internet is not a good idea as the box will not be known to NTL and therefor will not work 9 times out of 10.
Pay for a wireless or wired router and you can have more than one pc attached to your BB feed at any given time legally as you don't need a second SACM to share the same feed in a house.
If you don't mind wires trailing around the house you can just share the connection between the PCs with an ethernet cable and NICs. Routers are easier to use and wireless routers remove the need for cables all over the place.
You are going about sharing your connection the wrong way at the moment and NTL will never support or help set up an unofficial SACM that they have not supplied.
Edit:
If you want to share your connection within your home then feel free to read through this thread
http://www.cableforum.co.uk/board/sh...434#post594434
as it explains how to do it. If you need more info then try a search for "wireless router" or "router" within the forum search system as we have a number of threads about it. Basically though you will probably never get that second SACM working on your connection and you have wasted money buying it
Welcome to the forum by the way
