Patents Assigned to 3Com Corporation
  • Patent number: 7673035
    Abstract: A network management apparatus and method processes network management data received during the monitoring of a network and generates events for presentation in an event list to a user when certain event conditions are detected. Network management data received in relation to an event condition is processed to determine whether it represents a recurring event condition. A recurring event condition is determined if a predetermined number of equivalent events have been generated, and appear in the event list, in an immediately preceding time period. In the described embodiment, if a recurring event condition occurs, a recurring event is generated, and subsequent occurrences of the event condition are not included in the event list presented to the user.
    Type: Grant
    Filed: July 2, 2001
    Date of Patent: March 2, 2010
    Assignee: 3Com Corporation
    Inventors: David James Stevenson, Hamish Donald Stuart Martin, Andrew Hunter Gray, Christopher Robert Linzell
  • Patent number: 7672941
    Abstract: A deterministic finite state machine is operated to detect any one of a plurality of digital signatures each corresponding to a succession of characters and each defined by a sequence of states in the state machine. The machine is organized such that for each state after the first in any sequence there are not more than two allowed exit transitions of which one is to a default state. Input characters are examined to determine a transition from a current state of the machine to a next state. When the machine responds to an input character to perform a transition to the default state, the input character is re-examined to determine the next state of the state machine. The reduction in transitions saves considerable space in memory.
    Type: Grant
    Filed: February 22, 2005
    Date of Patent: March 2, 2010
    Assignee: 3Com Corporation
    Inventors: Peter Furlong, Eoghan Stack, David John Law, Hana Hailichova
  • Patent number: 7660990
    Abstract: Secure communications on a network. An unauthenticated client on an network sends start packets to locate other clients. The unauthenticated client receives responses to the start packets from other clients on the network. The responses may be advertise packets that are from advertising clients that may be authenticated clients or other unauthenticated clients in authenticated mode. The unauthenticated client prioritizes the received packets so that authentication can be performed with the most desirable advertising client. Authentication packets are sent and received between the unauthenticated client and the advertising client in an attempt to authenticate.
    Type: Grant
    Filed: April 27, 2004
    Date of Patent: February 9, 2010
    Assignee: 3Com Corporation
    Inventors: Brant D. Thomsen, Brent R. Beachem, Thomas M. Wheeler
  • Patent number: 7660408
    Abstract: The present invention discloses circuits for isolating and attenuating signals generated by a telephone network. In disclosed embodiments, a metering pulse signal is isolated from the terminals of the connecting device, and then attenuated with an impedance that is synthesized with a programmable digital signal processor. Embodiments also utilize the digital signal processor to synthesize a termination impedance for the connecting device. The termination impedance matches closely the characteristic impedance of the network, so as to minimize wave reflections and the like.
    Type: Grant
    Filed: April 28, 2000
    Date of Patent: February 9, 2010
    Assignee: 3Com Corporation
    Inventors: Spiro Poulis, John Evans, Shayne Messerly
  • Patent number: 7660323
    Abstract: A network unit for the reception and forwarding of data packets and for use in a stack of similar units includes a data processor and cascade control logic for the exchange of control frames with others of said units in the stack. The cascade control logic is operative to cooperate by means of the control frames in an automatic process for incrementally applying stack numbers to the units in the stack. The cascade control logic can retain a stack number in storage and the data processor is operative to execute a program to apply to the network unit and the other units progressive stack numbers which accommodate previously applied and retained stack numbers. The network unit can act as a master applying the program to the other units and as a slave whereupon it receives a stack number determined by another unit in the stack.
    Type: Grant
    Filed: June 28, 2004
    Date of Patent: February 9, 2010
    Assignee: 3Com Corporation
    Inventors: Peter A Saunderson, Michael D Hutchings
  • Patent number: 7657926
    Abstract: Network communications are secured on clients that do not have a user properly logged in and authenticated. The clients have transmit and/or receive functionality disabled. When a user logs into the client and is properly authenticated, the transmit and/or receive functionality is enabled. In some embodiments, the client can then download firewall policy information to prevent the client from communicating on certain ports or with certain clients. The firewall policy information may be specific to a role that a user logged into the client has. For example, administrators, executives and employee roles may each use different firewall policy information.
    Type: Grant
    Filed: March 19, 2004
    Date of Patent: February 2, 2010
    Assignee: 3Com Corporation
    Inventor: Steven T. Baker
  • Publication number: 20100012865
    Abstract: The present invention is directed to an electron beam crossbar switch for interconnection between communication units. The crossbar switch includes an array of electrically charged particle emitter source devices with an input connected to a slow wave structure coupled to the emitter source. An array of detectors is positioned relative to the array of emitter devices for receiving charged particles from various of the emitter devices. X and y deflection means are positioned adjacent each of the emitters for directing the charged particles from each of the emitters to at least one of the detectors to provide more signal output and a reduction in deflection accuracy.
    Type: Application
    Filed: August 1, 2008
    Publication date: January 21, 2010
    Applicant: 3Com Corporation
    Inventor: Thomas C. Hogan
  • Publication number: 20090323675
    Abstract: A system includes application software that issues voice function requests to one or more web services server. A web services server receives the requests from the application software. In response to the voice function request, the web services server selects at least one to perform one or more actions to provide the voice function request and issues implementation specific messages to the selected device or devices to perform the actions.
    Type: Application
    Filed: June 2, 2009
    Publication date: December 31, 2009
    Applicant: 3Com Corporation
    Inventor: Sarwar S. Raza
  • Patent number: 7634577
    Abstract: A Media Gateway proxy receives a message and parses the message. The message contains an attribute, sub-command, and a destination address. The proxy stores the message and the attributes. Each of the attributes corresponds to a selected one of a plurality of Media Gateways. Each of the gateways has an address. The proxy finds in the memory the address of the selected Media Gateway using the destination address and the attribute. The proxy then forms a message using said sub-command, said address, and said attribute and transmits the message to the destination Media Gateway.
    Type: Grant
    Filed: April 19, 2004
    Date of Patent: December 15, 2009
    Assignee: 3Com Corporation
    Inventors: David A. Grabelsky, Boris Bekkerman, John Poplett, Sudhakar Ramakrishna
  • Patent number: 7624434
    Abstract: A system for providing security in a computing network. The system has a server for distributing policies to be implemented by firewall devices in the network. The firewall devices provide hardware implemented firewalls to communication devices making network connections. The system has logic to allow a connection to be made to the network via a communication device at a node provided the firewall device is at that node. Therefore, the firewall device must be in the system for a connection to be established via the communication device. Additionally, the system is configured to cause data transferred by the communication device to be processed by the firewall.
    Type: Grant
    Filed: March 1, 2002
    Date of Patent: November 24, 2009
    Assignee: 3Com Corporation
    Inventors: Peter M. Rigstad, John Y. Yoon, Mark Farahar, Barani Subbiah, Brant D. Thomsen, David E. Richmond, Vered Maor Semel, Earl Bryner
  • Patent number: 7613771
    Abstract: A method for operating a computer network for example a school to preload the content of web addresses on the local memory, i.e. the web cache memory for use in for example a subsequent lesson. The network comprises at least one device, a web cache memory, and internet access apparatus to connect a device on the network to internet using a web browser, relevant devices on the network being accessible to a network administrator and defined network users (teachers and pupils), a method whereby one of said defined network users (teachers) uses a modified web browser to define a set of web addresses (web pages) to be accessed, said set of web addresses being stored in the network, and operates the network to cause the content of the set of web addresses to be stored on said web cache memory, whereby the content may be accessed by the pupils during said lesson via the network without further access to internet.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: November 3, 2009
    Assignee: 3Com Corporation
    Inventors: Scott Alexander Rivers, Julian Michael Palmer
  • Patent number: 7613170
    Abstract: A method and system for rerouting IP telephony call information. The system includes an existing IP telephony call, the telephony call originating at a first IP telephony phone. A second IP telephony phone receiving the IP telephony call from the first IP phone and a network routing condition, the routing condition causing the IP telephony call to be rerouted. A switchover instruction, the switchover instruction initiating a switchover of the existing IP telephony call to a PSTN.
    Type: Grant
    Filed: June 29, 2004
    Date of Patent: November 3, 2009
    Assignee: 3Com Corporation
    Inventors: David A. Grabelsky, Michael Homeier
  • Patent number: 7603408
    Abstract: Methods and systems for managing a network using a handheld communications device are provided. The methods and systems provide advantages for Network Administrators that require mobility in accessing information about network connected devices and for controlling selected network management functions.
    Type: Grant
    Filed: May 9, 2000
    Date of Patent: October 13, 2009
    Assignee: 3Com Corporation
    Inventors: Brian Evan McGinnis, Vaibhavi Kothari, William Tanaka, Stephen Ngok Tsun, Les R. Stuart
  • Patent number: 7603486
    Abstract: A method and apparatus for detecting the presence and the type of network devices connected to a management device via transmission lines. The apparatus may include a pull-up resistor, a pull-down resistor, a filter, and a presence detector, the resistors superimposing a DC or low-frequency voltage on the transmission line. The impact, if any, of the DC voltage one communications equipment and circuitry can be reduced by a coupling that isolates the DC voltage. Similarly, the filter prevents transmitted data signals from interfering with the DC voltage level. The method and apparatus function regardless of whether the network device is functional or powered on, and different values of pull-up or pull-down resistors can be used to indicate the type of device that terminates the transmission line.
    Type: Grant
    Filed: November 26, 2002
    Date of Patent: October 13, 2009
    Assignee: 3Com Corporation
    Inventors: Linh My Le, Dwight D. Dipert, Ellen Oschmann
  • Patent number: 7596614
    Abstract: A computer network including: at least one switch connecting at least one edge device to the remainder of the network, said at least one switch including: snooping apparatus using DHCP to monitor the signal traffic through the switch to or from the each edge device to determine, without changing the traffic signals, for each edge device, the MAC address, the IP address, and the port of the switch to which it is connected, and a dynamic table within said switch of, for each edge device, the MAC address, the IP address, and the port which it is connected, the contents of the table being provided by said snooping apparatus.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: September 29, 2009
    Assignee: 3Com Corporation
    Inventors: Peter Saunderson, John P. Smith
  • Patent number: 7584299
    Abstract: The gateway devices in a VPN require configuration when the VPN is set up and to reflect changes. To process the configuration tasks efficiently, a method is described of configuring a virtual private network (VPN) within a shared network, in which a queue of configuration tasks is created for gateway devices belonging to the VPN. The configuration tasks include sending static network routing information to said gateway devices. The tasks are deployed by retrieving a next task from the queue, and interrogating the gateway device to which the task relates, to identifying any change in subnetworks connected thereto since the task was created. If no change is identified, the retrieved task is performed. If, on the other hand, a change is identified, update configuration tasks are created for all relevant gateway devices in the VPN.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: September 1, 2009
    Assignee: 3Com Corporation
    Inventors: David John Maxwell, Robert Duncan, Steven James Urouhart, Mike Moran
  • Patent number: 7577857
    Abstract: A computer system comprises host processor and a network interface, wherein the host processor includes resources supporting a full power mode, a lower power mode and a power down mode, as seen in standard system bus specifications such as PCI and InfiniBand. The network interface includes a medium interface unit coupled to network media supporting a least high speed protocol, such as a Gigabit Ethernet or high-speed InfiniBand, and a lower speed protocol, such as one of 10 Mb and 100 Mb Ethernet or a lower speed InfiniBand. Power management circuitry forces the medium interface unit to the lower speed protocol in response to an event signaling entry of the lower power mode. In the lower power mode, the network interface consumes less than the specified power when executing the lower speed protocol, and consumes greater than the specified power when executing the high speed protocol.
    Type: Grant
    Filed: August 29, 2001
    Date of Patent: August 18, 2009
    Assignee: 3Com Corporation
    Inventors: Nathan Henderson, Chi-Lie Wang, Baodong Hu
  • Patent number: 7573873
    Abstract: A system and method for Internet telephony between a caller station and a callee station are described. The caller station is connected to a first edge network via a first telephony interface, and the callee station is connected to a second edge network via a second telephony interface. An intermediate network is connected to the first edge network via a first router and is connected to the second edge network via a second router. The callee station is associated with a callee station number. The first router initiates the call in response to a setup message that includes the callee station number. A first gatekeeper, controlling the first router, and a second gatekeeper, controlling the second router, together mediate the process of setting up the call. A back end server, in communication with the first and second gatekeepers, stores the addresses and station numbers needed to set up the call.
    Type: Grant
    Filed: April 28, 2004
    Date of Patent: August 11, 2009
    Assignee: 3Com Corporation
    Inventors: Michael S. Borella, Nurettin B. Beser, Ikhlaq S. Sidhu, Guido M. Schuster
  • Patent number: 7570608
    Abstract: A method and system receives a far-end signal and determines whether the far-end signal is representative of a modulated signal. The method and system also receives a near-end signal and determines whether the near-end signal is representative of a modulated signal. Predetermined characteristics of the near and far-end signals are determined as is whether the echo canceller will converge for the far-end signal. The operation of the echo canceller is controlled in response to the determination of the predetermined conditions and in response the determination of whether the far-end and near-end signals are modulated signals.
    Type: Grant
    Filed: January 23, 2006
    Date of Patent: August 4, 2009
    Assignee: 3Com Corporation
    Inventor: Youhong Lu
  • Patent number: 7564835
    Abstract: A system and method for maximizing the use of bandwidth optimization techniques in a voice-over-packet telephony system. In exemplary embodiments, the VOP system includes a plurality of telephones connected to a VOP telephony system. Upon receiving request to initiate a VOP connection, the end office switch connects to an originating softswitch for signaling functions and to an originating media gateway for transporting the media associated with the VOP connection. A connection information system accessible to the softswitch maintains connection information relating to media sessions between the originating media gateway and a plurality of candidate terminating media gateways. The connection information system may be accessed during connection initiation and advantageously used to determine whether there are nearly-simultaneously occurring and distinct media sessions having common endpoints such that bandwidth optimization techniques may be implemented.
    Type: Grant
    Filed: November 6, 2002
    Date of Patent: July 21, 2009
    Assignee: 3Com Corporation
    Inventors: David Grabelsky, Anoop Tripathi, Boris Bekkerman, Michael Homeier