Hi Peter,
I hope you found your solution by now, but just in case:
You will need: 1 - the Power adapter, to juice up your modem. 2 - A network cable (RJ45), to connect the modem to your computer our router. 3 - your phone line (RJ11), to feed into your modem. 4 - Line filters, for all phone connections on the same line, except the one you plug your modem into (you might want to make sure that you get the right filters for your NORTEL modem). 5 - You might need a "splitter", that Gizmo that separates 1 phone plug into 2 phone plugs.
Please note that there are not many TELCO's (therefore ISPs as well) who can provide service through the Nortel modems. These work on the G.CAP protocol, and the G.DMT is quite standardized.
Make sure you look into this before subscribing; you might need to get a new modem.
Best regards,
bdahl