No, because most ADSL routers including the DG834G handles PPPoE over ATM, via the DSL port, rather than over ethernet. Therefore you need a router that does PPPoE over the WAN ethernet port, which a "cable" or normal router would have.
Simply put, ADSL routers should not be used for FTTC as it's no longer ADSL, but VDSL2.
It doesn't matter as although it can do "PPPoE" authentication, it can only do this over the built in ADSL port on the router, which is it's default gateway. So be wary, you need a router than can do PPPoE over an ethernet (WAN) port, which ADSL router's generally can't do.