The mac address on the modem is logged on you account.
All modems that are not in service are taken off the active list so to speak (the odd one does slip through )
so whan a modem that is connected to the network and is mac does not match up its given a RESTRICTED IP that will only let it connect to the Registration servers at NTL. Also when the modem has been registared its then given its sevice level is bronze silver,gold.
The modem only stores your service level no user names or passwords are on the modem
with dial up they would know who you are by username and pass and log it against you number you are calling in from
but with Broadband its the mac address of the modem
(So if you were to do some hacking they could trace it down to IP and MAC and look on the list to see who the mac belongs to ie your account and address)
in theory you can have as many CM on you cable feed to your house so long as the power levels are ok for each modem
but normall ntl only allow 1 modem per address there are the odd and rare exceptions to the rule
ie share house (bedsits)
but the thing is as far as i know ntl have never sold ambit modems bit like the digi boxes
some of the older modems customers could buy but that changed a while ago
so in speaking that modem is still ntl property but thats another thread
so unless you know some tech in a call center who would reg that modem for you its not going to do much
because when ntl install a modem or digi box the details are passed to the installs dept and the mac address is logged to your account also with digi the nagra and card number are logged to your account
So NTL can just put in a mac and see who the true renter of the CM is and where it should be
It would of been better to buy a router and network them all
Sorry to give you bad news
![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)