Digital subscriber communication system
AssigneeSeismograph Service Corporation
InventorDonald W. Moses
Life of this patent
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Abstract
A digital subscriber communications system for transmitting voice and data information is disclosed. The signal transmissions, on any suitable medium, are in an optimized sixteen bit per frame format with a framing bit in each frame. The framing bit is detected with unique circuitry and used to phase a master synchronization signal for decoding the information transmitted.
Claims41
A digital subscriber communications system having means for transmitting and receiving a plurality of time-division multiplexed signals, each signal having a series of frames and a predetermined number of binary digits per frame, between a central office location and multiple subscriber locations characterized in that:
- the means for transmitting the signals comprises;
- means for generating a separate master synchronization signal for each signal transmitted;
- means connected to the synchronization signal generating means for encoding each of the signals for transmission with an optimum frame format and optimum bit format within each frame wherein each frame comprises fifteen information bits per frame and one framing bit per frame thereby creating a frame format having sixteen bits per frame;
- and
- transmitter means for transmitting each signal in the sixteen bit frame format;
- and
- the means for receiving the signals comprises:
- means for detecting the framing bit in each frame;
- means connected to the framing bit detecting means for recovering the master synchronization signal;
- and
- means for decoding the information in each frame according to the frame format and bit format in each frame established by the framing bit and the master synchronization signal.
A method of operating a digital subscriber communications system wherein a plurality of digital signals, each having a series of frames and a predetermined number of binary bits per frame, are transmitted between a central office location and multiple subscriber locations comprising:
- generating a master synchronization signal to establish an optimum frame format for each transmitted signal and a framing bit for each frame;
- encoding the signals with the optimum frame format and an optimum bit format within each frame wherein each frame comprises fifteen information bits per frame and one framing bit per frame thereby creating a frame format having sixteen bits per frame;
- transmitting the signals at an eight thousand frame per second rate;
- receiving the transmitted signal as a series of binary bits;
- detecting the framing bit in each frame;
- using the framing bit in each frame to recover and phase a master synchronization signal for each digital signal received;
- using the synchronization signal for decoding the information in each frame according to the bit and frame format.
Dependencies are inferred from the claim text.