Abstract: A direct broadcast satellite system delivers video content to a subscriber and a CATV network is used to simultaneously provide data services to the same subscriber. Since the CATV system is not used to deliver video/television programming channels, these same channels can be used to transport downstream and upstream data signals. To provide upstream performance and immunity to noise, upstream data traffic signals are upconverted at a subscriber's cable modem for transmission by channels having center frequencies higher than 54 MHz. Cable modem circuitry combines the conventional output signal with the output of a local oscillator to raise the carrier frequency of upstream traffic before it is introduced to the CATV network. Thus, upstream traffic can be carried by channels higher than 54 MHz. This upstream signal is received by a block converter that lowers the carrier frequency back to a conventional channel frequency before processing by a standard CMTS.