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"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 8085676 | Method and system for looping back traffic in QIQ ethernet rings and 1:1 protected PBT trunks A resilient virtual Ethernet ring has nodes interconnected by working and protection paths. If a span fails, the two nodes immediately on either side of the failure are cross-connected to fold the ring. Working-path traffic is cross-connected onto the protection pat... | 12/27/2011 |
| 8085675 | Method and apparatus to test a data path in a network A method and apparatus for testing a data path in a network is described. The method may comprise creating a closed loop in the data path so that test data (e.g., fixed set of known data) sent from a local network device to a downstream network device is returned by... | 12/27/2011 |
| 8068435 | Rate adaptive modem A communication system transmitting signals over a network using a transmission waveform in which a plurality of data packets are transmitted in a payload field of a transmission frame, the system includes a transmitter, which has a transmitting portion that sends i... | 11/29/2011 |
| 8040814 | Relay apparatus, conduction confirmation method thereof and conduction confirmation circuit The relay apparatus relays frames in which a plurality of network identifiers are set and comprises a frame determining unit, a converting unit, and a sending unit. The frame determining unit determines whether a frame received at a communication port is a specific ... | 10/18/2011 |
| 8009571 | Method and system for PHY loop detection A method, system and apparatus are provided for detecting a loop-back in a physical layer on an Ethernet link. In the physical layer, a device sends a base page on the Ethernet link. The base page has at least one next page capability bit set. Subsequently, the devi... | 08/30/2011 |
| 7983177 | Communication node, and ring configuration method and ring establishment method in communication system A plurality of communication nodes are one-to-one connected to each other by Ethernet (registered trademark) which is duplicated with a normal-system ring and with a standby-system ring. The communication node includes an A port, a B port, and a communication proces... | 07/19/2011 |
| 7957304 | System for and method of using a loopback mechanism to perform network testing A system for and method of actively running performance tests is presented. The system and method allow a device connected, via a VPN or IPSec tunnel, to a VoIP or other service provider network, to run network performance tests using the IP address assigned by a VP... | 06/07/2011 |
| 7957303 | Communication quality evaluation method, derivation device, communication quality evaluation system and computer program When simulating communication using a communication network such as a VoIP network, an actual communication state is accurately simulated, and communication is simulated. The distribution of delay times of packets is transformed by a predetermined transformation met... | 06/07/2011 |
| 7953017 | Application specific service ping packet Various exemplary embodiments relate to a method and related network node including one or more of the following: creating the application specific service ping packing including a special packet identification field that identifies the application specific service ... | 05/31/2011 |
| 7940683 | In-bound mechanism that verifies end-to-end service configuration with application awareness A method of using deep packet inspection (DPI) to verify a service configuration. The method may include one or more of the following: building an application specific service ping packet having an application identification field that identifies an application to w... | 05/10/2011 |
| 7936684 | Physical layer loopback In some embodiments, a chip comprises control circuitry to provide inband signals, inband output ports, and transmitters to transmit the inband signals to the inband output ports. The control circuitry selectively includes loopback initiating commands in the inband ... | 05/03/2011 |
| 7929451 | Switch and packet forwarding method A switch that performs packet forwarding processing based on a label for a connection in which a communication path is specified by the label, includes a receiving unit that receives loopback information with a label of a first layer used for packet forwarding for a... | 04/19/2011 |
| 7929450 | In-bound mechanism that monitors end-to-end QOE of services with application awareness A method of using deep packet inspection (DPI) to monitor Quality of Experience (QoE) The method may include one or more of the following: building an application specific service ping packet having an application identification field that identifies an application ... | 04/19/2011 |
| 7885196 | Loop communication system and communication device A loop communication system includes a plurality of communication devices, each of which holds an identification data assigned to the communication device, and has a single port used for transmission and reception of a data packet for a transmission data, and which ... | 02/08/2011 |
| 7864691 | Apparatus and method for performing a loopback test in a communication system The invention is test apparatus and methods for performing loopback tests. The tests involve generating a packet-based test message having a source address and a destination address. When the test message arrives at the destination, the addresses are exchanged and t... | 01/04/2011 |
| 7855971 | Interface device and topology formation method When a loop connection associated with a port is detected while the port is in an Untested state ST3, a state machine corresponding to the port shifts from the state ST3 to a Loop_disabled state ST4. The state machine then shifts from state ST | 12/21/2010 |
| 7852779 | Communication node, and ring configuration method and ring establishment method in communication system A plurality of communication nodes are one-to-one connected to each other by Ethernet (registered trademark) which is duplicated with a normal-system ring and with a standby-system ring. The communication node includes an A port, a B port, and a communication proces... | 12/14/2010 |
| 7830809 | Methods and apparatus for characterizing a route in a fibre channel fabric A fibre channel frame is received at a first fibre channel switch. The fibre channel frame includes time stamp information associated with fibre channel switches between a second fibre channel switch and the first fibre channel switch. A time-to-live (TTL) value inc... | 11/09/2010 |
| 7826383 | Home phoneline network alliance responder for IPTV installations A device for testing a home phoneline network alliance performance of a local network is disclosed. The device includes a first network interface, a second network interface, a test module, and a processor. The first network interface is adapted to connect with the ... | 11/02/2010 |
| 7821952 | Loop locating apparatus and loop locating method in layer 3 network A loop locating apparatus and method enabling simple and fast identification of a Layer 3 loop fault occurring in a network, wherein, when the possibility of a Layer 3 loop is detected, a loop locating command function unit makes a packet transmission/... | 10/26/2010 |
| 7801052 | Apparatus for measuring transmission delay A transmission delay measuring circuit may include a first transmission path, a second transmission path, an inversion circuit, a first multiplexer, and an output terminal. The second transmission path may have the same structure as the structure of the first transm... | 09/21/2010 |
| 7792047 | Asymmetric packet switch and a method of use The present invention relates to a packet switch and a packet switching method. An example embodiment of the present invention comprises at least three network ports, at least one instrument port, a mux-switch, a packet switch fabric, and an address table. The embod... | 09/07/2010 |
| 7787388 | Method of and a system for autonomously identifying which node in a two-node system has failed A method of and a system for autonomously identifying which node in a two-node system has failed are described. The system includes two nodes and a fault-tolerant communication fabric. The fabric defines a plurality of communication paths connecting the two nodes, a... | 08/31/2010 |
| 7764621 | Packet loopback methods and replacing a destination address with a source address Packet switch operating methods and packet switches receive a packet on a first port of the packet switch. The packet is addressed to a device that is in communication with a second port of forwarding circuitry of the packet switch and the packet has an Ethernet des... | 07/27/2010 |
| 7746796 | Directed echo requests and reverse traceroute In one embodiment, a first node may send an out-of-band message to a second node to request that the second node initiate an in-band echo request for a specified tunnel, e.g., toward one or more third nodes. Upon receiving the in-band echo request, one or more respo... | 06/29/2010 |
| 7746795 | Method, system, and apparatus for loopback parameter exchange A loopback test to test a communication link for a layered interface where in a master agent programs the electrical parameters for the slave agent, such as, the offset, timing, and current compensation with a loopback control register. The slave agent's transmitter... | 06/29/2010 |
| 7742427 | Internal loop-back architecture for parallel serializer/deserializer (SERDES) An internal loop-back architecture for a parallel serializer/deserializer (SERDES) includes a transmitter macro including a plurality of transmit elements arranged in a parallel architecture, and a receiver macro including a plurality of receive elements arranged in... | 06/22/2010 |
| 7710888 | Apparatus and method for testing and fault isolation in a communication network An apparatus and method for performing automated testing and trouble isolation of a communications link in an access network is described. Communications link testing may occur without taking the communications link out of service for the duration of the test. ... | 05/04/2010 |
| 7706293 | Performance management system, apparatus and method between residential gateway and broadband remote access server The present invention discloses a performance management system, apparatus and method between a Residential Gateway (RG) and a Broadband Remote Access Server (BRAS), the method thereof includes: configuring an OAM IWF for the protocol conversion between the performa... | 04/27/2010 |
| 7701862 | Method and system for PHY loop detection A method, system and apparatus are provided for detecting a loop-back in a physical layer on an Ethernet link. In the physical layer, a device sends a base page on the Ethernet link. The base page has at least one next page capability bit set. Subsequently, the devi... | 04/20/2010 |
| 7697446 | Link testing in an ethernet DSL network A system and method in a communications network of testing a communications link between Customer Premises Equipment (CPE) and a Broadband Remote Access Server (BBRAS). The CPE and BBRAS communicate mutually via an intermediate Internet Protocol Digital Subscriber L... | 04/13/2010 |
| 7693083 | Audio network system An audio network system allows any two nodes among a plurality of nodes to transmit and receive audio data to and from each other. The plurality of the nodes are connected in loop so as to allow transmission of the audio data in loop manner through the plurality of ... | 04/06/2010 |
| 7688744 | Broadband test line access circuit, broadband test-line access board and broadband test device A broadband test line-access board includes at least two broadband test line-access units. Each of the at least two broadband test line-access units includes first, second, and third test terminals, a signal splitter, first, second, and third switches, and first sec... | 03/30/2010 |
| 7684340 | Packet forwarding apparatus and method thereof A packet forwarding device is disclosed. The packet forwarding device includes: a transmission interface, coupled to a second network device; a processing unit, coupled to a first network device; a forwarding unit, coupled between the transmission interface and the ... | 03/23/2010 |
| 7672245 | Method, device, and system for detecting layer 2 loop A request-packet transmitting unit transmits a predetermined number of request packets having a non-unicast destination address that can be received by a target network including a network identified by a first network address, from a monitoring network identified b... | 03/02/2010 |
| 7639626 | Built in self test There is provided a method for Loss of Signal Built In Self Test, and corresponding apparatus comprising: a loopback driver for receiving test signals, and for directing the test signals to at least one of a first output of the loopback driver and a second output of... | 12/29/2009 |
| 7636319 | Fastpath implementation for a double tagging loopback engine A network component for processing a packet can include a buffer configured to receive a packet, a forwarding unit configured to forward the packet received at the first buffer to a loopback port, and a transmitting unit configured to transmit the packet out of the ... | 12/22/2009 |
| 7616582 | System and method for selecting data providers A preferred data provider is selected from a plurality of data providers by receiving a request for data from a client together with client identification data, identifying a plurality of data providers capable of providing data to the client, providing the client i... | 11/10/2009 |
| 7613125 | Method and apparatus for temporal alignment of multiple parallel data streams Methods and apparatus for aligning the transmitters of two or more bidirectional ports of an integrated circuit (IC), particularly an application-specific IC (ASIC) or field-programmable gate array (FPGA). Misalignment of two or more transmitters is determined by th... | 11/03/2009 |
| 7602729 | Slow-fast programming of distributed base stations in a wireless network A slow fast programming method for efficient remote field update in distributed base stations overcomes significant fiber propagation delay associated with a remote unit by applying programming data at two clock frequencies. A fast clock frequency is used for progra... | 10/13/2009 |
