I have a ZyXel p-660R-ELNK modem that earthlink ISP sent me when I signed up with them and then later I switched to AT&T (at that time it was belllsouth). The Modem that AT&T sent me went out and I need to purchase a new one. AT&T wants to charge me $80.00 for a new one so I am trying to use the ZyXel from earthlink. I was told (by an AT&T Rep) that it should work, but they do not have the documentation on it to know how to tell me the configure it. If someone could help me with this, I would appreciate very much.