Patents Assigned to STC Limited
  • Repeater supervision
    Patent number: 5271035
    Abstract: An arrangement for signalling to supervisory equipment in a repeater in a digital transmission system. A digital data test sequence comprising a plurality of multi-bit words each accompanied by a parity check bit is fed to the transmission systems. Digital supervisory signals modulate the test sequence and periodic parity violations are imposed on the test sequence. A first counter counts the periodic violations imposed on the test sequence and a second like counter counts errors in the test signals returned from the system.
    Type: Grant
    Filed: August 10, 1992
    Date of Patent: December 14, 1993
    Assignee: STC Limited
    Inventors: Robert J. Cole, Christopher D. Stark