It is usually coax cable, 75 ohm impedance, of a very high grade, similar to that used for satellite downlinks, usually dual-screen. F-type connectors are crimped on to the cable.
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Originally Posted by MacUser
if I'm not allowed to touch the connection, does that mean I can't swap the ethernet modem for a router?
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You are allowed to use only the cable modem supplied by NTL. If you want a router, you purchase a router with an ethernet WAN port to connect to the ethernet port of the NTL cable modem. NTL cable broadband is not ADSL, and so combined ADSL modem-routers (of the type commonly available on the domestic market) do not work with NTL broadband.