Patents by Inventor James E. Aaroen

James E. Aaroen 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).

  • Method and apparatus for detecting transmission system failures in a communications network
    Patent number: 4260859
    Abstract: The failure of an interoffice carrier transmission system is detected by monitoring the signaling irregularities on the trunks served by the system. When at least two trunks fail to return a "start-dial" signal from the terminating office, all trunks are removed from service. The trunks are periodically tested to ascertain when the carrier system has been restored. The trunks are tested less frequently for prolonged carrier failures and at least two trunks, including the last trunk to fail, must pass the test before the carrier system is considered restored to service.
    Type: Grant
    Filed: January 23, 1980
    Date of Patent: April 7, 1981
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: James E. Aaroen