Search Patents
  • Analysis of network performance
    Publication number: 20060050649
    Abstract: A method for testing of a communication network, using a plurality of traffic agents coupled to communicate via the network. The method includes transmitting a sequence of data packets via the network from a first one of the traffic agents to a second one of the traffic agents and recording arrival characteristics of the packets in the sequence, responsive to receiving the packets at the second traffic agent. The arrival characteristics of different packets in the sequence are compared so as to determine a measure of variability in transmission of the packets via the network.
    Type: Application
    Filed: October 31, 2005
    Publication date: March 9, 2006
    Inventors: Shlomit Botton-Dascal, Benny Rachlevski-Reich, Yair Harel, Moshe Sidi, Israel Cidon
  • Sampling test of network performance
    Publication number: 20070195707
    Abstract: A method for testing a communication network includes transmitting a flow of test packets over a path through the network. The flow includes a series of bursts of the test packets separated by intervals having an interval duration, each burst comprising a sequence of the test packets and having a burst duration less than the interval duration. Arrival characteristics of the test packets in the flow are measured at a receiving end of the path. The arrival characteristics include at least one of a packet loss characteristic, a packet delay characteristic, and a packet jitter characteristic. A quality defect in the network is detected based on the measured arrival characteristics.
    Type: Application
    Filed: February 22, 2006
    Publication date: August 23, 2007
    Inventors: Israel Cidon, Lior Horn, Moshe Sidi, Benny Zangiri
  • Analysis of network performance
    Patent number: 6990616
    Abstract: A method for testing of a communication network, using a plurality of traffic agents coupled to communicate via the network. The method includes transmitting a sequence of data packets via the network from a first one of the traffic agents to a second one of the traffic agents and recording arrival characteristics of the packets in the sequence, responsive to receiving the packets at the second traffic agent. The arrival characteristics of different packets in the sequence are compared so as to determine a measure of variability in transmission of the packets via the network.
    Type: Grant
    Filed: April 24, 2000
    Date of Patent: January 24, 2006
    Assignee: Attune Networks Ltd.
    Inventors: Shlomit Botton-Dascal, Benny Rachlevski-Reich, Yair Harel, Moshe Sidi, Israel Cidon
  • Analysis of network performance
    Patent number: 7688741
    Abstract: A method for testing of a communication network, using a plurality of traffic agents coupled to communicate via the network. The method includes transmitting a sequence of data packets via the network from a first one of the traffic agents to a second one of the traffic agents and recording arrival characteristics of the packets in the sequence, responsive to receiving the packets at the second traffic agent. The arrival characteristics of different packets in the sequence are compared so as to determine a measure of variability in transmission of the packets via the network.
    Type: Grant
    Filed: October 31, 2005
    Date of Patent: March 30, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Shlomit Botton-Dascal, Benny Rachlevski-Reich, Yair Harel, Moshe Sidi, Israel Cidon
  • Fault location and performance testing of communication networks
    Patent number: 6269330
    Abstract: A method and apparatus for testing a network having a plurality of nodes. The method includes sending commands to one or more traffic agents connected to the network and to at least one network management agent coupled to a respective node of the network, transmitting data from at least one of the traffic agents over the network responsive to the commands, determining network information at the at least one network management agent responsive to the commands and to transmission of the data through the respective node, and receiving and evaluating the network information to assess a state of the network.
    Type: Grant
    Filed: October 1, 1998
    Date of Patent: July 31, 2001
    Assignee: Attune Networks Ltd.
    Inventors: Israel Cidon, Moshe Sidi
  • Duplex mismatch testing
    Publication number: 20060221843
    Abstract: A method for testing a communication network includes transmitting at least one unidirectional flow over a path through the network, and measuring arrival characteristics of the least one unidirectional flow at a receiving end of the path. The arrival characteristics include at least one of a packet throughput characteristic, a packet delay characteristic, a packet loss characteristic, a packet jitter characteristic and a packet misordering characteristic. A bidirectional flow is transmitted over the path from both ends of the path simultaneously, and the arrival characteristics of the bidirectional flow are measured at least at one of the ends. The arrival characteristics of the unidirectional and bidirectional flows are compared in order to detect a fault in the path.
    Type: Application
    Filed: April 1, 2005
    Publication date: October 5, 2006
    Applicant: VIOLA NETWORKS LTD.
    Inventors: Israel Cidon, Arie Kazatcker, Moshe Sidi
  • Quality of service testing of communications networks
    Publication number: 20070076605
    Abstract: Network testing is conducted using a pair of traffic agents that acts as sender and receiver endpoints. The sending traffic agent generates and transmits a stream of packet batches, each batch being composed of high and low priority packets in a predetermined sending order. The receiving traffic agent analyzes the order of packet arrival in the stream relative to the sending order, and returns results to a traffic control module. Path speed and the priority classification of the traffic are parameters used to configure the tests. The tests are typically run periodically under different load conditions in order to evaluate the effects of other traffic being concurrently transiting the network.
    Type: Application
    Filed: September 13, 2005
    Publication date: April 5, 2007
    Inventors: Israel Cidon, Lior Horn, Moshe Sidi, Benny Zangiri
  • Sampling test of network performance
    Patent number: 7990887
    Abstract: A method for testing a communication network includes transmitting a flow of test packets over a path through the network. The flow includes a series of bursts of the test packets separated by intervals having an interval duration, each burst comprising a sequence of the test packets and having a burst duration less than the interval duration. Arrival characteristics of the test packets in the flow are measured at a receiving end of the path. The arrival characteristics include at least one of a packet loss characteristic, a packet delay characteristic, and a packet jitter characteristic. A quality defect in the network is detected based on the measured arrival characteristics.
    Type: Grant
    Filed: February 22, 2006
    Date of Patent: August 2, 2011
    Assignee: Cisco Technology, Inc.
    Inventors: Israel Cidon, Lior Z Horn, Moshe Sidi, Benny Zangiri
  • Duplex mismatch testing
    Patent number: 7525922
    Abstract: A method for testing a communication network includes transmitting at least one unidirectional flow over a path through the network, and measuring arrival characteristics of the least one unidirectional flow at a receiving end of the path. The arrival characteristics include at least one of a packet throughput characteristic, a packet delay characteristic, a packet loss characteristic, a packet jitter characteristic and a packet misordering characteristic. A bidirectional flow is transmitted over the path from both ends of the path simultaneously, and the arrival characteristics of the bidirectional flow are measured at least at one of the ends. The arrival characteristics of the unidirectional and bidirectional flows are compared in order to detect a fault in the path.
    Type: Grant
    Filed: April 1, 2005
    Date of Patent: April 28, 2009
    Assignee: Cisco Technology, Inc.
    Inventors: Israel Cidon, Arie Kazatcker, Moshe Sidi
  • Quality of service testing of communications networks
    Patent number: 7835293
    Abstract: Network testing is conducted using a pair of traffic agents that acts as sender and receiver endpoints. The sending traffic agent generates and transmits a stream of packet batches, each batch being composed of high and low priority packets in a predetermined sending order. The receiving traffic agent analyzes the order of packet arrival in the stream relative to the sending order, and returns results to a traffic control module. Path speed and the priority classification of the traffic are parameters used to configure the tests. The tests are typically run periodically under different load conditions in order to evaluate the effects of other traffic being concurrently transiting the network.
    Type: Grant
    Filed: September 13, 2005
    Date of Patent: November 16, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Israel Cidon, Lior Horn, Moshe Sidi, Benny Zangiri
  • Network packet tracking
    Patent number: 6958977
    Abstract: A method for testing of a communication network having a plurality of end-points, using one or more network agents coupled to the network at respective locations. The method includes specifying at least one packet filtering criterion, and transmitting one or more data packets meeting the at least one criterion through the network from one of the end-point to another. At least one of the data packets meeting the criterion is intercepted using the network agents at one or more of the respective locations in the network traversed by the at least one of the data packets. Information regarding the at least one intercepted packet at the one or more respective locations is recorded and processed to analyze a route of the at least one intercepted packet through the network.
    Type: Grant
    Filed: June 6, 2000
    Date of Patent: October 25, 2005
    Assignee: Viola Networks LTD
    Inventors: Roee Mitrani, Lior Horn, Uri Keidar, Moshe Sidi, Israel Cidon
  • Flow control using output port buffer allocation
    Patent number: 6252849
    Abstract: A system for implementing flow control in an information network such as a local area network (LAN) utilizing a Carrier Sense Multiple Access with Collision Detection (CSMA/CD) as specified by the IEEE standard 802.03. The information network transmits computer information such as computer data between various computer systems coupled to the information network. The information network includes information network switches capable of routing information packets received via its input ports to its output ports. The received packets are held in buffers of the output ports before being transmitted via the output ports. A portion of each output port buffer is allocated to each input port. The information network switch provides a control packet such as a PAUSE frame to an upstream source operably coupled to the input port in response to the level occupancy of the portion of the buffer allocated to the input port exceeding a first level.
    Type: Grant
    Filed: June 30, 1998
    Date of Patent: June 26, 2001
    Assignee: Sun Microsystems, Inc.
    Inventors: Raphael Rom, Asad Khamisky, Moshe Sidi
  • System and method for traversing ATM networks based on forward and reverse virtual connection labels
    Patent number: 5579480
    Abstract: In a communication network having a set of hosts and switch based label swapping communication nodes, each node has a control processor that is also a host that sends and receives messages via the switching apparatus in its associated node. Each node's control processor also includes a virtual connection (VC) traversal procedure that implements the methodology of the present invention. The control processor of any node along an established connection can initiate the transmission of a VC traversal message to the control processors of all the nodes along the connection. The VC traversal message is transmitted as one or more ATM cells, where each cell includes a standard ATM header for routing the cell to a neighboring node's control processor, as well as a VC traversal header in the body of the cell that identifies the connection being traversed.
    Type: Grant
    Filed: April 28, 1995
    Date of Patent: November 26, 1996
    Assignee: Sun Microsystems, Inc.
    Inventors: Israel Cidon, Man-Tung T. Hsiao, Raphael Rom, Phanindra Jujjavarapu, Moshe Sidi, Asad Khamisy
  • System for defining multicast message distribution paths having overlapping virtual connections in ATM networks and assigning identical labels to overlapping portions of the virtual channels
    Patent number: 5684961
    Abstract: In a communication network having a set of hosts and switch based label swapping communication nodes, each node has a control processor that is also a host that sends and receives messages via the switching apparatus in its associated node. At least one of the hosts includes a distribution tree set up procedure. That procedure stores source and destination data designating a set of source hosts and a set of destination hosts in the communication network, and defines a distribution tree of virtual connections. The designated source hosts and destination hosts may include the control processors of some or all the network nodes. The defined virtual connections include a virtual connection from each designated source host to all of the designated destination hosts, and message labels for all messages sent by the source hosts to be routed to the destination nodes.
    Type: Grant
    Filed: April 28, 1995
    Date of Patent: November 4, 1997
    Assignee: Sun Microsystems, Inc.
    Inventors: Israel Cidon, Man-Tung Tony Hsiao, Raphael Rom, Phanindra Jujjavarapu, Moshe Sidi, Asad Khamisy
  • Integrated CPU core and parallel, independently operating DSP module and time-critical core priority scheme
    Patent number: 5590357
    Abstract: An integrated data processing system includes a shared internal bus for transferring both instructions and data. A shared bus interface unit is connected to the shared internal bus and connectable via a shared external bus to a shared external memory array such that instructions and data held in the shared external memory array are transferrable to the shared internal bus via the shared bus interface unit. A general purpose (GP) central processing unit (CPU) is connected to the shared internal bus for retrieving GP instructions. The OP CPU includes an execution unit for executing GP instructions to process data retrieved by the GP CPU from the shared internal bus. A digital signal processor (DSP) module connected to the shared internal bus, the DSP module includes a signal processor for processing an externally-provided digital signal received by the DSP module by executing DSP command-list instructions.
    Type: Grant
    Filed: September 6, 1994
    Date of Patent: December 31, 1996
    Assignee: National Semiconductor Corporation
    Inventors: Amos Intrater, Andy Birenbaum, Gideon Intrater, Iddo Carmon, Ilan Shimony, Itael Fraenkel, Lev Epstein, Lior Katzri, Omri Viner, Raya Levitan, Ronny Cohen, Sidi Yomtov, Yehezkel Tzadik, Zvi Greenfeld, Israel Greiss, Oved Oz, Yachin Afek, Meir Tsadik, Moshe Doron, Alberto Sandbank
  • Integrated data processing system including CPU core and parallel, independently operating DSP module
    Patent number: 5592677
    Abstract: An integrated data processing system includes a shared internal bus for transferring both instructions and data. A shared bus interface unit is connected to the shared internal bus and connectable via a shared external bus to a shared external memory array such that instructions and data held in the shared external memory array are transferrable to the shared internal bus via the shared bus interface unit. A general purpose (GP) central processing unit (CPU) is connected to the shared internal bus for retrieving GP instructions. The GP CPU includes an execution unit for executing GP instructions to process data retrieved by the GP CPU from the shared internal bus. A digital signal processor (DSP) module connected to the shared internal bus, the DSP module includes a signal processor for processing an externally-provided digital signal received by the DSP module by executing DSP command-list instructions.
    Type: Grant
    Filed: May 19, 1994
    Date of Patent: January 7, 1997
    Assignee: National Semiconductor Corporation
    Inventors: Amos Intrater, Andy Birenbaum, Gideon Intrater, Iddo Carmon, Ilan Shimony, Itael Fraenkel, Lev Epstein, Lior Katzri, Omri Viner, Raya Levitan, Ronny Cohen, Sidi Yomtov, Yehezkel Tzadik, Zvi Greenfeld, Israel Greiss, Oved Oz, Yachin Afek, Meir Tsadik, Moshe Doron, Alberto Sandbank
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