Full-duplex communication system on a two wire line Patent #: 3937882
ApplicationNo. 06/249395 filed on 03/31/1981
US Classes:370/509, Using synchronization information contained in a frame370/522, Signaling (ancillary to main information)379/387.01, SUBSTATION OR TERMINAL CIRCUITRY379/93.06, Digital379/93.08Transmission scheme (e.g., compression/decompression, transmission rate)
ExaminersPrimary: Olms, Douglas W.
Attorney, Agent or Firm
International ClassesH04Q 11/04 (20060101)
H04J 3/06 (20060101)
AbstractA frame format for PCM speech data in a telphone transmission system and a digital telephone apparatus for use with this frame format are disclosed. The frame format includes a superframe formed of 32 data frames, each comprising three 8 bit data words (bytes). The first data word of a frame includes a synchronization code and a signalling code; the second and third data words include PCM speech samples or other digital data. A transmission rate of 192 kilobits/second is chosen so as to match the PCM sampling rate of 8 KHz.