| 摘要 |
The present invention describes a method for transmitting reverse analog signals within a specific portion of a reverse band in an HFC communications system. Subscriber equipment (305) receives input defining the specific portion of the band for transmitting reverse analog signals. An optical transmitter (315) then converts the received reverse signals to digital reverse signals and transmits the digital reverse signals at a specified clock rate. Due to shifting of the digital reverse signals within the reverse bandwidth, shifting of the received digital signals reflect the specific bandwidth within which the reverse signals were originally transmitted. An optical receiver (320) then receives the shifted digital reverse signals and converts them back to the original reverse analog signals, whereby transmitting reverse analog signals that are confined to a specific bandwidth and sub-sampling the specific bandwidth within the reverse bandwidth allows for a substantial decrease in bit rate throughout the HFC communications system allowing a transition network between an HFC network and a digital network.
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