Patent ID: 6639911
Filing Date: 2003-10-28
Classification: H04L

Abstract:
A data communication system that shares transmission lines for both telephone service and data transmission service, said data communication system comprising:a central side for providing the telephone service and the data transmission service, said central side including, a central-side transmitter that provides data transmission service using first type modulation to transmit data; a central-side receiver that provides data transmission service configured to use either first type demodulation or second type demodulation to receive data; a splitter circuit coupled to a transmission line, said splitter circuit directs incoming telephone service communications over the transmission line to a telephone network and directs incoming data transmission service communications over the transmission line to said central-side receiver, and couples outgoing telephone service communications and outgoing data transmission service communications to the transmission line; and anda remote side for providing the telephone service and the data transmission service, said remote side couples to a telephone service device, said first remote side includes, a remote-side receiver operatively coupled to the transmission line, said remote-side receiver provides data transmission service using first type demodulation to receive data; and a remote-side transmitter operatively coupled to the transmission line, said remote-side transmitter provides data transmission service using either first type modulation or second type modulation to transmit data, wherein when said remote-side transmitter provides data transmission service using first type modulation, then said central-side receiver is configured to use first type demodulation, and wherein when said remote-side transmitter provides data transmission service using second type modulation, then said central-side receiver is configured to use second type demodulation.