Patents by Inventor Alexander Philip Campbell

Alexander Philip Campbell 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: 10554040
    Abstract: A device, according to one embodiment, includes a fuse, and a resistor electrically coupled directly to the fuse in series therewith. A hybrid device, according to another embodiment, includes a fuse, and a resistor electrically coupled directly to the fuse in series therewith in a single package. A resistance of the resistor is 1 ohm or less, and is substantially temperature insensitive.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: February 4, 2020
    Assignee: Lenovo Enterprise Solutions (Singapore) Pte. Ltd.
    Inventors: Jian Meng, Christian Savard, Alexander Philip Campbell, Donald Richard Dignam, Eric Rong Ao, Georges P. Turcotte, Stephen John Flint
  • Patent number: 9888560
    Abstract: A differential transmission line includes a positive conductor on which a positive complementary component of a differential signal is transmitted, and a negative conductor parallel to the positive conductor on which a negative complementary component of the differential signal is transmitted. A quarter wavelength differential coupler is inserted along a length of the positive and negative conductors. The quarter wavelength differential coupler has a length corresponding to a frequency of common mode noise on the positive and negative conductors. The quarter wavelength differential coupler reduces the common mode noise at the frequency as the differential signal passes through the quarter wavelength differential coupler.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: February 6, 2018
    Assignee: Lenovo Enterprise Solutions (Singapore) PTE. LTD.
    Inventors: Rong Eric Ao, Alexander Philip Campbell, Donald Richard Dignam, Stephen John Flint, Jian Meng
  • Patent number: 9479362
    Abstract: A differential transmission line with a common mode notch filter includes adjacently arranged, repeating differential transmission line pair sections. The sections have lengths that are each equal to half of an electric wavelength of a lowest frequency of a common mode electromagnetic wave to be suppressed during transmission of an electric signal over the differential transmission line. Each section includes a pair of conductors separated from one another by a spacing. The width of each conductor and the spacing between the conductors of each section vary over the length thereof according to a same pattern such that at every point over the length of each section a differential mode impedance of the differential transmission line is identical. A common mode impedance of the differential transmission line changes periodically in accordance with the lengths of the sections.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: October 25, 2016
    Assignee: Lenovo Enterprise Solutions (Singapore) PTE. LTD.
    Inventors: Rong Eric Ao, Alexander Philip Campbell, Donald Richard Dignam, Stephen John Flint, Jian Meng
  • Publication number: 20160285148
    Abstract: A differential transmission line includes a positive conductor on which a positive complementary component of a differential signal is transmitted, and a negative conductor parallel to the positive conductor on which a negative complementary component of the differential signal is transmitted. A quarter wavelength differential coupler is inserted along a length of the positive and negative conductors. The quarter wavelength differential coupler has a length corresponding to a frequency of common mode noise on the positive and negative conductors. The quarter wavelength differential coupler reduces the common mode noise at the frequency as the differential signal passes through the quarter wavelength differential coupler.
    Type: Application
    Filed: March 27, 2015
    Publication date: September 29, 2016
    Inventors: Rong Eric Ao, Alexander Philip Campbell, Donald Richard Dignam, Stephen John Flint, Jian Meng
  • Publication number: 20160268795
    Abstract: A device, according to one embodiment, includes a fuse, and a resistor electrically coupled directly to the fuse in series therewith. A hybrid device, according to another embodiment, includes a fuse, and a resistor electrically coupled directly to the fuse in series therewith in a single package. A resistance of the resistor is 1 ohm or less, and is substantially temperature insensitive.
    Type: Application
    Filed: March 13, 2015
    Publication date: September 15, 2016
    Inventors: Jian Meng, Christian Savard, Alexander Philip Campbell, Donald Richard Dignam, Eric Rong Ao, Georges P. Turcotte, Stephen John Flint
  • Publication number: 20160065391
    Abstract: A differential transmission line with a common mode notch filter includes adjacently arranged, repeating differential transmission line pair sections. The sections have lengths that are each equal to half of an electric wavelength of a lowest frequency of a common mode electromagnetic wave to be suppressed during transmission of an electric signal over the differential transmission line. Each section includes a pair of conductors separated from one another by a spacing. The width of each conductor and the spacing between the conductors of each section vary over the length thereof according to a same pattern such that at every point over the length of each section a differential mode impedance of the differential transmission line is identical. A common mode impedance of the differential transmission line changes periodically in accordance with the lengths of the sections.
    Type: Application
    Filed: July 17, 2015
    Publication date: March 3, 2016
    Inventors: Rong Eric Ao, Alexander Philip Campbell, Donald Richard Dignam, Stephen John Flint, Jian Meng
  • Patent number: 9137176
    Abstract: A scaled-out fabric coupler (SFC) chassis includes a plurality of root fabric cards installed on the one side of the SFC chassis. Each root fabric card has a plurality of electrical connectors. A plurality of line cards is installed on the opposite side of the SFC chassis. Each line card is one of two types of line cards. One of the two types of line cards is a switch-based network line card having network ports for connecting to servers and switches. The other of the two types of line cards is a leaf fabric card having fabric ports for connecting to a fabric port of a network element. Each of the two types of the line cards has electrical connectors that mate with one electrical connector of each root fabric card installed in the chassis.
    Type: Grant
    Filed: May 16, 2012
    Date of Patent: September 15, 2015
    Assignee: International Business Machines Corporation
    Inventors: Alexander Philip Campbell, Keshav Govind Kamble, Dar-Ren Leu, Vijoy A. Pandey, Atul Tambe
  • Patent number: 9059937
    Abstract: A switch includes network ports and a network processor with a fabric interface that provides SerDes (Serializer/Deserializer) channels. The network processor divides each packet received over the network ports into cells and distributes the cells across the SerDes channels. Fabric ports of the switch communicate with the fabric interface to transmit cells to and receive cells from the fabric interface. The switch is selectively configurable as a standalone switch by connecting each fabric port of the switch to another of the fabric ports of the switch, as a member of a switch stack by connecting each fabric port of the switch to a different other switch through one fabric port of that other switch, or as a member of a distributed fabric system by connecting each fabric port of the switch to a different scaled-out fabric coupler (SFC) chassis by an SFC fabric port of that SFC chassis.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: June 16, 2015
    Assignee: International Business Machines Corporation
    Inventors: Sushma Anantharam, Alexander Philip Campbell, Keshav Govind Kamble, Dar-Ren Leu, Vijoy A. Pandey, Nandakumar Peethambaram
  • Patent number: 9013994
    Abstract: A distributed virtual chassis comprises scaled-out fabric coupler (SFC) boxes. Each SFC box has fabric ports and a cell-based switch fabric for switching cells associated with a packet among the SFC fabric ports of that SFC box. Distributed line cards (DLCs) include switching DLCs and an appliance DLC (A-DLC). Each switching DLC has network ports. Each switching DLC and A-DLC has DLC fabric ports. Each switching DLC and A-DLC is connected to each of the SFC boxes. The A-DLC provides an upper layer service for packets arriving on the network ports of the switching DLCs. To forward a packet to the A-DLC, a switching DLC divides the packet into cells and distributes the cells among the SFC boxes. The SFC boxes forward the cells to the A-DLC, and the A-DLC reassembles the packet from the cells and provides the upper layer service to the packet.
    Type: Grant
    Filed: April 24, 2012
    Date of Patent: April 21, 2015
    Assignee: International Business Machines Corporation
    Inventors: Alexander Philip Campbell, Keshav Govind Kamble, Dar-Ren Leu, Vijoy A. Pandey
  • Patent number: 8982905
    Abstract: A system includes scaled-out fabric coupler (SFC) boxes and distributed line card (DLC) boxes. Each SFC box has fabric ports and a cell-based switch fabric for switching cells. Each DLC box is in communication with every SFC box. Each DLC box has network ports receiving packets and network processors. Each processor has a fabric interface that provides SerDes channels. The processors divide each packet received over the network ports into cells and distribute the cells of each packet across the SerDes channels. Each DLC box further comprises DLC fabric ports through which the DLC is in communication with the SFCs. Each DLC fabric port includes a pluggable interface with a given number of lanes over which to transmit and receive cells. Each lane is mapped to one of the SerDes channels such that an equal number of SerDes channels of each fabric interface is mapped to each DLC fabric port.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: March 17, 2015
    Assignee: International Business Machines Corporation
    Inventors: Keshav Govind Kamble, Alexander Philip Campbell, Atul A. Tambe, Vijoy A. Pandey
  • Publication number: 20140219286
    Abstract: A switch includes network ports and a network processor with a fabric interface that provides SerDes (Serializer/Deserializer) channels. The network processor divides each packet received over the network ports into cells and distributes the cells across the SerDes channels. Fabric ports of the switch communicate with the fabric interface to transmit cells to and receive cells from the fabric interface. The switch is selectively configurable as a standalone switch by connecting each fabric port of the switch to another of the fabric ports of the switch, as a member of a switch stack by connecting each fabric port of the switch to a different other switch through one fabric port of that other switch, or as a member of a distributed fabric system by connecting each fabric port of the switch to a different scaled-out fabric coupler (SFC) chassis by an SFC fabric port of that SFC chassis.
    Type: Application
    Filed: April 4, 2014
    Publication date: August 7, 2014
    Applicant: International Business Machines Corporation
    Inventors: Sushma Anantharam, Alexander Philip Campbell, Keshav Govind Kamble, Dar-Ren Leu, Vijoy A. Pandey, Nandakumar Peethambaram
  • Patent number: 8780931
    Abstract: A switch includes network ports and a network processor with a fabric interface that provides SerDes (Serializer/Deserializer) channels. The network processor divides each packet received over the network ports into cells and distributes the cells across the SerDes channels. Fabric ports of the switch communicate with the fabric interface to transmit cells to and receive cells from the fabric interface. The switch is selectively configurable as a standalone switch by connecting each fabric port of the switch to another of the fabric ports of the switch, as a member of a switch stack by connecting each fabric port of the switch to a different other switch through one fabric port of that other switch, or as a member of a distributed fabric system by connecting each fabric port of the switch to a different scaled-out fabric coupler (SFC) chassis by an SFC fabric port of that SFC chassis.
    Type: Grant
    Filed: May 11, 2012
    Date of Patent: July 15, 2014
    Assignee: International Business Machines Corporation
    Inventors: Sushma Anantharam, Alexander Philip Campbell, Keshav Govind Kamble, Dar-Ren Leu, Vijoy A. Pandey, Nandakumar Peethambaram
  • Patent number: 8773999
    Abstract: A distributed virtual chassis comprises scaled-out fabric coupler (SFC) boxes. Each SFC box has fabric ports and a cell-based switch fabric for switching cells associated with a packet among the SFC fabric ports of that SFC box. Distributed line cards (DLCs) include switching DLCs and an appliance DLC (A-DLC). Each switching DLC has network ports. Each switching DLC and A-DLC has DLC fabric ports. Each switching DLC and A-DLC is connected to each of the SFC boxes. The A-DLC provides an upper layer service for packets arriving on the network ports of the switching DLCs. To forward a packet to the A-DLC, a switching DLC divides the packet into cells and distributes the cells among the SFC boxes. The SFC boxes forward the cells to the A-DLC, and the A-DLC reassembles the packet from the cells and provides the upper layer service to the packet.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: July 8, 2014
    Assignee: International Business Machines Corporation
    Inventors: Alexander Philip Campbell, Keshav Govind Kamble, Dar-Ren Leu, Vijoy A. Pandey
  • Publication number: 20130107709
    Abstract: A distributed virtual chassis comprises scaled-out fabric coupler (SFC) boxes. Each SFC box has fabric ports and a cell-based switch fabric for switching cells associated with a packet among the SFC fabric ports of that SFC box. Distributed line cards (DLCs) include switching DLCs and an appliance DLC (A-DLC). Each switching DLC has network ports. Each switching DLC and A-DLC has DLC fabric ports. Each switching DLC and A-DLC is connected to each of the SFC boxes. The A-DLC provides an upper layer service for packets arriving on the network ports of the switching DLCs. To forward a packet to the A-DLC, a switching DLC divides the packet into cells and distributes the cells among the SFC boxes. The SFC boxes forward the cells to the A-DLC, and the A-DLC reassembles the packet from the cells and provides the upper layer service to the packet.
    Type: Application
    Filed: October 26, 2011
    Publication date: May 2, 2013
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Alexander Philip Campbell, Keshav Govind Kamble, Dar-Ren Leu, Vijoy A. Pandey
  • Publication number: 20130107713
    Abstract: A distributed virtual chassis comprises scaled-out fabric coupler (SFC) boxes. Each SFC box has fabric ports and a cell-based switch fabric for switching cells associated with a packet among the SFC fabric ports of that SFC box. Distributed line cards (DLCs) include switching DLCs and an appliance DLC (A-DLC). Each switching DLC has network ports. Each switching DLC and A-DLC has DLC fabric ports. Each switching DLC and A-DLC is connected to each of the SFC boxes. The A-DLC provides an upper layer service for packets arriving on the network ports of the switching DLCs. To forward a packet to the A-DLC, a switching DLC divides the packet into cells and distributes the cells among the SFC boxes. The SFC boxes forward the cells to the A-DLC, and the A-DLC reassembles the packet from the cells and provides the upper layer service to the packet.
    Type: Application
    Filed: April 24, 2012
    Publication date: May 2, 2013
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Alexander Philip Campbell, Keshav Govind Kamble, Dar-Ren Leu, Vijoy A. Pandey
  • Publication number: 20120294314
    Abstract: A scaled-out fabric coupler (SFC) chassis includes a plurality of root fabric cards installed on the one side of the SFC chassis. Each root fabric card has a plurality of electrical connectors. A plurality of line cards is installed on the opposite side of the SFC chassis. Each line card is one of two types of line cards. One of the two types of line cards is a switch-based network line card having network ports for connecting to servers and switches. The other of the two types of line cards is a leaf fabric card having fabric ports for connecting to a fabric port of a network element. Each of the two types of the line cards has electrical connectors that mate with one electrical connector of each root fabric card installed in the chassis.
    Type: Application
    Filed: May 16, 2012
    Publication date: November 22, 2012
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Alexander Philip Campbell, Keshav Govind Kamble, Dar-Ren Leu, Vijoy A. Pandey, Atul Tambe
  • Publication number: 20120297103
    Abstract: A system includes scaled-out fabric coupler (SFC) boxes and distributed line card (DLC) boxes. Each SFC box has fabric ports and a cell-based switch fabric for switching cells. Each DLC box is in communication with every SFC box. Each DLC box has network ports receiving packets and network processors. Each processor has a fabric interface that provides SerDes channels. The processors divide each packet received over the network ports into cells and distribute the cells of each packet across the SerDes channels. Each DLC box further comprises DLC fabric ports through which the DLC is in communication with the SFCs. Each DLC fabric port includes a pluggable interface with a given number of lanes over which to transmit and receive cells. Each lane is mapped to one of the SerDes channels such that an equal number of SerDes channels of each fabric interface is mapped to each DLC fabric port.
    Type: Application
    Filed: August 31, 2011
    Publication date: November 22, 2012
    Applicant: International Business Machines Corporation
    Inventors: Keshav Govind Kamble, Alexander Philip Campbell, Atul A. Tambe, Vijoy A. Pandey
  • Publication number: 20120287926
    Abstract: A switch includes network ports and a network processor with a fabric interface that provides SerDes (Serializer/Deserializer) channels. The network processor divides each packet received over the network ports into cells and distributes the cells across the SerDes channels. Fabric ports of the switch communicate with the fabric interface to transmit cells to and receive cells from the fabric interface. The switch is selectively configurable as a standalone switch by connecting each fabric port of the switch to another of the fabric ports of the switch, as a member of a switch stack by connecting each fabric port of the switch to a different other switch through one fabric port of that other switch, or as a member of a distributed fabric system by connecting each fabric port of the switch to a different scaled-out fabric coupler (SFC) chassis by an SFC fabric port of that SFC chassis.
    Type: Application
    Filed: May 11, 2012
    Publication date: November 15, 2012
    Applicant: International Business Machines Corporation
    Inventors: Sushma Anantharam, Alexander Philip Campbell, Keshav Govind Kamble, Dar-Ren Leu, Vijoy A. Pandey, Nandakumar Peethambaram