Cool. One giant step forward for tech support, a rare thing these daze.
Groan. Few DSL modems support PPPoA. It's mostly used in combination modem plus routers. Many of those I previously listed will only do PPPoE or RFC2364(?) bridging. In general, it will need to be a modem that allows you to login and configure it. The Quest hardware list at:
I could only fine one modem that does PPPoA. Speedstream 5100b