A universal broadband server connected between a plurality of subscriber lines, at least one upstream link, and a central office provides broadband service to a plurality of customer premise equipment devices connected to the plurality of subscriber lines. The universal broadband server may also provides analog modem service to the plurality of customer premise equipment devices connected to the plurality of subscriber lines. A dynamic bandwidth allocation method adjusts the transmit power and bandwidth at which the universal broadband server communicates with the plurality of customer premise equipment devices in consideration of the maximum available bandwidth provided by the at least one upstream link, and the maximum available power.