A quantum well layer is provided in a semiconductive device. The invention relates to methods and apparatus for a network controller that manages a configuration of set top terminals in a program delivery system. A seal ring is disposed adjacent the open end of the cylindrical can for sealing the ring on the RPV flange. Fiber optic transmission increases the allowed distance between the ADSL transceiver located at the customer location and the respective ADSL transceiver located in the telephone central office. All of the data is brought out of the banks in parallel and sorted as it enters the main amplifiers.