Patents by Inventor Gerhard Schaich

Gerhard Schaich has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Circuit arrangement for telecommunication switching systems, particularly PCM-time-division multiplex telephone switching systems with a central matrix and with local sub-switching matrices connected to the same
    Patent number: 4901347
    Abstract: A circuit arrangement for telecommunication switching systems, including PCM time division multiplex telephone switching systems, with double central switching matrix by which two corresponding line trunk groups comprising a sub-switching matrix each and a group control unit each, are allocated to each other in pairs via two time-division-multiplex lines. The line units and the PCM-lines leading to the central switching matrix, which are individually respectively allocated to the two line trunk groups, and which are connected with the respective sub-switching matrix of their own line trunk group during normal service, are switchable, during emergency service of one of the two line trunk groups, to the sub-switching matrix of the respective other line trunk group.
    Type: Grant
    Filed: May 23, 1988
    Date of Patent: February 13, 1990
    Assignee: Siemens Aktiengesellschaft
    Inventors: Lothar Schmidt, Klaus Eberlein, Gerhard Schaich, Fritz Hlawa
  • Method for monitoring information transmission in connected through four-wire connecting paths, more particularly semipermanently connected through connecting paths in digital time multiplex exchanges
    Patent number: 4821256
    Abstract: The switching network is tested by comparison of bit streams coming from the double part switching network parts; other parts of the exchange are tested by parity checking. Evaluation takes place at a central location; when a parity error is found in the transmission in a direction of transmission, the parity bit generated for transmission in the other direction of transmission is falsified.
    Type: Grant
    Filed: June 25, 1987
    Date of Patent: April 11, 1989
    Assignee: Siemens Aktiengesellschaft
    Inventors: Lothar Schmidt, Gerhard Schaich, Wolfram Ernst
  • Circuit arrangement for centrally controlled time division multiplex telecommunication exchange facilities
    Patent number: 4763316
    Abstract: A circuit for a centrally controlled time division multiplex telecommunication exchange having PCM line/trunk groups connected to a switching network wherein each line/trunk group comprises a plurality of line units to connect one time division multiplex interexchange trunk each and is connected to a switching network over a time division multiplex line. Two line/trunk groups are assigned to each other in pairs. The connection devices which are assigned to one and to the other of two line/trunk groups and which in normal operation are connected with the time division multiplex switching device of each of their own line/trunk group can be changed over during emergency operation of one of the two line/trunk groups to the time division multiplex switching device of the other line/trunk group.
    Type: Grant
    Filed: February 19, 1987
    Date of Patent: August 9, 1988
    Assignee: Siemens Aktiengesellschaft
    Inventors: Gerhard Schaich, Ludwig Schoenauer