Patents by Inventor Ulises Sala

Ulises Sala 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 detection and protection against data loss in a fractional T1/E1 communications environment
    Patent number: 6181677
    Abstract: A method and apparatus for protection against loss of data in a fractional T1/E1 communications environment utilizes a message signaling arrangement between data service units and/or channel service units (DSU/CSU) to detect interruption in data transference occurring within a common carrier network due, for example, to an out-of-service condition. A “heartbeat” signal in a proprietary message format is generated and sent on a periodic basis to one or more destination DSUs/CSUs through the common carrier network over a separate T1/E1 maintenance channel. A selectable duration watchdog timer at each DSU/CSU is reset every time a heartbeat signal message is received from a remote unit. If the heartbeat signal is not received within the specified amount of time, the watchdog timer expires triggering the DSU/CSU to enter a dial back-up mode wherein an alternate communications link is established.
    Type: Grant
    Filed: February 18, 1998
    Date of Patent: January 30, 2001
    Assignee: Milgo Solutions, Inc.
    Inventors: Ron Valli, Sam Hitchcock, Ulises Sala