Patents Assigned to Standard Telephones and Cables Pty. Ltd.
  • Patent number: 5003580
    Abstract: An interface arrangement (2) comprising interface circuits (5,7) and processor (14) allows a personal computer (10) to operate in conjunction with a telephone subset (1) associated with a main switch system (9) in which the signalling systems used by the telephone subset and the computer differ. The interface arrangement allows the subset and the computer to be connected to the subsets switching system to permit at least some of the subsets signalling functions to be performed by the computer.
    Type: Grant
    Filed: March 8, 1989
    Date of Patent: March 26, 1991
    Assignee: Standard Telephones and Cables Pty. Ltd.
    Inventors: Dzung M. Duong, Evan J. Stanbury
  • Patent number: 4947426
    Abstract: A protection device is provided for a telephone having a two wire subscriber line and an earth line. The protection device comprises a single surge protection device connected between a bridge rectifier polarity guard and the remainder of the telephone circuitry, which is connected to the output of the polarity guard. Three diodes are used to interconnect the earth line and the pair of output lines from the polarity guard to the surge protection device in such a way as to prevent surges from being fed to the remainder of the telephone circuitry. The surge paths including one or two arms of the polarity guard.
    Type: Grant
    Filed: October 19, 1988
    Date of Patent: August 7, 1990
    Assignee: Standard Telephone and Cables Pty, Ltd.
    Inventor: Frederick D. Montano
  • Patent number: D305332
    Type: Grant
    Filed: January 25, 1988
    Date of Patent: January 2, 1990
    Assignee: Standard Telephones and Cables Pty. Ltd.
    Inventors: Paul Schremmer, Andrew A. H. Crick