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I am trying to replace a 2wire ADSL modem thus far i have found out i need a device that supports PPPoE and has an RJ-11 jack on it. my isp is ATT if it matters
you could test all your lines with an OTDR (fancy term for fiber meeter) there a bit costly but a handy tool to have. I recommend the fluke DSP series but they have been retired and have a replacement out, sorry i cant recall the replacement model