Patents Assigned to XLNT Designs, Inc.
  • Synchronous bus and bus interface device
    Patent number: 5659718
    Abstract: A high performance bus and bus interface device for interconnecting numerous devices without using dedicated high current drivers at each device. The bus is synchronous and divided into a plurality of primary local busses and at least one global bus. Data can be transferred from a first device over a first primary local bus through a first global transceiver, over the global bus to a second global transceiver, and then to a second device through a second primary local bus. The bus is driven to a known state at the end of each burst of data transmitted by a device, before the bus is relinquished to another device. Buffers are provided in each device on the primary local bus which can be accessed by other devices.
    Type: Grant
    Filed: August 19, 1994
    Date of Patent: August 19, 1997
    Assignee: XLNT Designs, Inc.
    Inventors: Fazil Osman, Christopher H. Bracken, Michael F. Harris, Ronald S. Perloff
  • Ring network security system with encoding of data entering a subnetwork and decoding of data leaving the subnet work
    Patent number: 5638512
    Abstract: A system for securing communications between devices connected to a ring network. In accordance with the present invention, when a message frame is passed around the ring network, a gate keeper circuit associated with at least one port of a hub determines whether the message frame is intended for any of the nodes connected to that port. If the message frame is not intended for any of the nodes connected to that port, the message frame is encoded before it exits the hub through the port to traverse the subnetwork connected to the port, and decoded after it reenters the hub through the port. If and only if at least one node on the subnetwork connected to the port is intended to receive the message frame, then each node connected to that port can read the message frame.
    Type: Grant
    Filed: April 19, 1995
    Date of Patent: June 10, 1997
    Assignee: XLNT Designs, Inc.
    Inventors: Fazil Osman, Ronald Perloff
  • Graceful insertion of a tree into a ring network
    Patent number: 5522047
    Abstract: Systems and methods for providing graceful insertion of a station or tree into a ring type network. According to one aspect of the invention, graceful insertion is achieved after coupling a tree to a tree link of a master port by switching the tree into a local ring, holding the local ring, and awaiting a token on the network ring. After a token is received on the network ring, the tree is switched from the local ring to the network ring. Monitoring ring status in hardware provides the responsiveness necessary which software graceful insertion typically cannot provide.
    Type: Grant
    Filed: December 15, 1993
    Date of Patent: May 28, 1996
    Assignee: XLNT Designs, Inc.
    Inventors: Robert M. Grow, Ronald S. Perloff
  • Ring network security system with encoding of data entering a subnetwork and decoding of data leaving a subnetwork
    Patent number: 5495580
    Abstract: A system for securing communications between devices connected to a ring network. In accordance with the present invention, when a message frame is passed around the ring network, a gate keeper circuit associated with at least one port of a hub determines whether the message frame is intended for any of the nodes connected to that port. If the message frame is not intended for any of the nodes connected to that port, the message frame is encoded before it exits the hub through the port to traverse the subnetwork connected to the port, and decoded after it reenters the hub through the port. If and only if at least one node on the subnetwork connected to the port is intended to receive the message frame, then each node connected to that port can read the message frame.
    Type: Grant
    Filed: October 20, 1992
    Date of Patent: February 27, 1996
    Assignee: XLNT Designs, Inc.
    Inventor: Fazil Osman