Patents by Inventor Ian S. Crayford

Ian S. Crayford 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).

  • Patent number: 6556589
    Abstract: A novel method of operating repeaters or other hub devices in a local area network, such as one conforming to Ethernet protocol, in which there are a plurality of repeater interfaces of respectively different data rates for communicating with a link partner on a network medium. The methodology comprises determining the data rate of operation of the link partner, and based on that data rate, automatically steering data between the network medium and a selected one of the repeaters. In a preferred embodiment, a network transceiver comprises one or more physical layer devices (PHY), and a plurality of shared data busses corresponding, respectively, to the speeds of operation of the repeaters, for interconnecting the repeaters and one or more of the physical layer devices.
    Type: Grant
    Filed: January 4, 1999
    Date of Patent: April 29, 2003
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Stephen McRobert, Ian S. Crayford
  • Publication number: 20020146043
    Abstract: A novel method of operating repeaters or other hub devices in a local area network, such as one conforming to Ethernet protocol, in which there are a plurality of repeater interfaces of respectively different data rates for communicating with a link partner on a network medium. The methodology comprises determining the data rate of operation of the link partner, and based on that data rate, automatically steering data between the network medium and a selected one of the repeaters. In a preferred embodiment, a network transceiver comprises one or more physical layer devices (PHY), and a plurality of shared data busses corresponding, respectively, to the speeds of operation of the repeaters, for interconnecting the repeaters and one or more of the physical layer devices.
    Type: Application
    Filed: January 4, 1999
    Publication date: October 10, 2002
    Inventors: STEPHEN MCROBERT, IAN S. CRAYFORD
  • Patent number: 6016308
    Abstract: A method and system for providing statistical network information carried in a data packet being transmitted on a network. The method includes the steps of receiving a data packet having a data portion on a repeater and transferring the data portion to a management unit. The method further includes the step of appending statistical information to the data portion during an inter-packet gap period. The apparatus for increasing information in a data packet on a network includes a repeater mechanism, a management unit mechanism, and a packet tagging circuit. The repeater mechanism receives a data packet having a data portion, the management unit mechanism determines statistical information based on the data packet, and the packet tagging circuit appends information to the data portion of the data packet during an inter-packet gap period.
    Type: Grant
    Filed: August 15, 1996
    Date of Patent: January 18, 2000
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Ian S. Crayford, William Lo
  • Patent number: 5850515
    Abstract: A method and apparatus for securing a network from access by unauthorized end stations. A port in a multiport repeater can be disabled automatically upon detection of an unknown source address in a data packet. In addition, an interrupt signal is provided to the indicate the detection of an intruder. Further, the disabling of the port can be done substantially immediately to interrupt the re-transmission of a single packet. Alternatively, the disabling of a port can be done programmably after a predetermined number of intruder packets have been detected, or after the verification of packet integrity.
    Type: Grant
    Filed: April 10, 1997
    Date of Patent: December 15, 1998
    Assignee: Advanced Micro Devices, Inc.
    Inventors: William Lo, Ian S. Crayford
  • Patent number: 5654985
    Abstract: A system is provided for use in a network to provide authentication of packets of data, provide security to ensure the prevention of unauthorized receipt of data, to provide improved monitoring of the packets of data transmitted and received over such a network, and to detect changes in the network topology. Repeaters utilized in the network are provided with the capability to detect and interpret packet data and the source address (SA) and destination address (DA) fields to provide the improved features.
    Type: Grant
    Filed: May 23, 1996
    Date of Patent: August 5, 1997
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Ian S. Crayford, William Lo, Nader Vijeh
  • Patent number: 5610903
    Abstract: A system provides for detection of enhanced capabilities of stations on a communications network. A specified pattern of link test pulses are detected and transmitted to provide for the indication of enhanced capabilities. This is particularly useful for determining whether a particular station is in full duplex or half duplex mode without affecting overall network performance.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 11, 1997
    Assignee: Advanced Micro Devices, inc.
    Inventor: Ian S. Crayford
  • Patent number: 5592486
    Abstract: A method and apparatus for efficiently transferring a data packet on a network. The efficient transfer of data includes compressing the data as the data packet is transmitted from a repeater to a management unit by determining if a destination address of a received packet matches a stored management unit address. When the stored address does not match the destination address, the data packet is compressed. The apparatus includes a repeater, a management unit, and a packet compression mechanism. The apparatus further includes comparator circuit means for determining address comparisons and count comparisons to control data compression.
    Type: Grant
    Filed: March 17, 1995
    Date of Patent: January 7, 1997
    Assignee: Advanced Micro Devices, Inc.
    Inventors: William Lo, Ian S. Crayford
  • Patent number: 5581559
    Abstract: A method for providing a secure local area network includes the steps of receiving a data packet having a destination address and comparing the destination address to stored end station addresses. The data packet is disrupted on the repeater for the ports except the port with an associated stored end station address matching the destination address. Also, the disrupting of the data packet can be enabled on an individual port basis. A system includes a controller, a memory/comparator, and an inverse disrupt control mechanism. The inverse disrupt control mechanism produces a disrupt signal to disrupt the data packet on non-matching ports of the repeater when a match occurs within the repeater. The data packet is not disrupted on a port linking two repeaters when there is no match within the repeater. The inverse disrupt control can also be enabled or disabled on an individual port basis.
    Type: Grant
    Filed: March 17, 1995
    Date of Patent: December 3, 1996
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Ian S. Crayford, William Lo
  • Patent number: 5550803
    Abstract: A method and system for providing statistical network information carried in a data packet being transmitted on a network. The method includes the steps of receiving a data packet having a data portion on a repeater and transferring the data portion to a management unit. The method further includes the step of appending statistical information to the data portion during an inter-packet gap period. The apparatus for providing statistical information in a data packet on a network includes a repeater mechanism, a management unit mechanism, and a packet tagging circuit. The repeater mechanism receives a data packet having a data portion, the management unit mechanism determines statistical information based on the data packet, and the packet tagging circuit appends information to the data portion of the data packet during an inter-packet gap period.
    Type: Grant
    Filed: March 17, 1995
    Date of Patent: August 27, 1996
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Ian S. Crayford, William Lo
  • Patent number: 5467369
    Abstract: An integrated media attachment unit (MAU) operative for interfacing Digital Terminal Equipment (DTE) on a Local Area Network (LAN) using twisted pair media. The twisted pair function as either a DTE MAU or a repeater MAU. A line driver for the twisted pair differential signal provides a ramped response with low jitter while an improved Attachment Unit Interface (AUI) driver uses CMOS technology and provides simplified End-of-Transmission Delimiter (ETD) control. The twisted pair MAU includes a combined override and status indication of link status and an additional feature to allow automatic polarity reversal of differential signal input lines and polarity status signalling.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: November 14, 1995
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Nader Vijeh, Ian S. Crayford, Jeffrey M. Blumenthal
  • Patent number: 5432775
    Abstract: A system provides for detection of enhanced capabilities of stations on a communications network. A specified pattern of link test pulses are detected and transmitted to provide for the indication of enhanced capabilities. This is particularly useful for determining whether a particular station is in full duplex or half duplex mode without affecting overall network performance.
    Type: Grant
    Filed: December 3, 1993
    Date of Patent: July 11, 1995
    Assignee: Advanced Micro Devices, Inc.
    Inventor: Ian S. Crayford
  • Patent number: 5414694
    Abstract: A system is provided for use in a network to provide authentication of packets of data, provide security to ensure the prevention of unauthorized receipt of data, to provide improved monitoring of the packets of data transmitted and received over such a network, and to detect changes in the network topology. Repeaters utilized in the network are provided with the capability to detect and interpret packet data and the source address (SA) and destination address (DA) fields to provide the improved features.
    Type: Grant
    Filed: February 19, 1993
    Date of Patent: May 9, 1995
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Ian S. Crayford, William Lo, Nader Vijeh
  • Patent number: 5327465
    Abstract: An integrated media attachment unit (MAU) operative for interfacing Digital Terminal Equipment (DTE) on a Local Area Network (LAN) using twisted pair media. The twisted pair function as either a DTE MAU or a repeater MAU. A line driver for the twisted pair differential signal provides a ramped response with low jitter while an improved Attachment Unit Interface (AUI) driver uses CMOS technology and provides simplified End-of-Transmission Delimiter (ETD) control. The twisted pair MAU includes a combined override and status indication of link status and an additional feature to allow automatic polarity reversal of differential signal input lines and polarity status signalling.
    Type: Grant
    Filed: June 15, 1992
    Date of Patent: July 5, 1994
    Assignee: Advanced Micro Devices Inc.
    Inventors: John M. Wincn, Nader Vijeh, Ian S. Crayford, Jeffrey M. Blumenthal
  • Patent number: 5257287
    Abstract: A differential receiver incorporated into a MAU which receives both Manchester packets and linkpulses according to the IEEE 802.3 10Base-T standard has polarity detection and correction circuit for automatically detecting a reversed polarity for RD input lines. The differential receiver samples incoming pulses for time, amplitude and pulse width qualification and makes a preliminary polarity determination based upon polarity of such qualified pulses. This preliminary polarity allows a linktest state machine to transition to a link.sub.-- pass state, enabling output drivers of the MAU. Additionally, the linkpulse polarity information initially makes a polarity determination for the entire differential receiver which asserts a FIX POLARITY signal. The FIX POLARITY signal controls a correction circuit which internally remedies reversed input lines. Preferably, the correction circuit internally reroutes the signals.
    Type: Grant
    Filed: November 30, 1990
    Date of Patent: October 26, 1993
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Jeffrey M. Blumenthal, Nader Vijeh, John M. Wincn, Ian S. Crayford
  • Patent number: 5164960
    Abstract: An integrated media attachment unit (MAU) operative for interfacing Digital Terminal Equipment (DTE) on a Local Area Network (LAN) using twisted pair media. The twisted pair function as either a DTE MAU or a repeater MAU. A line driver for the twisted pair differential signal provides a ramped response with low jitter while an improved Attachment Unit Interface (AUI) driver uses CMOS technology and provides simplified End-of-Transmission Delimiter (EDT) control. The twisted pair MAU includes a combined override and status indication of link status and an additional feature to allow automatic polarity reversal of differential signal input lines and polarity status signalling.
    Type: Grant
    Filed: February 15, 1990
    Date of Patent: November 17, 1992
    Assignee: Advanced Micro Devices Inc.
    Inventors: John M. Wincn, Nader Vijeh, Ian S. Crayford, Jeffrey M. Blumenthal