Abstract: A CPU executes a process including determining a core node among plural relay nodes on a basis of route information, acquiring a first and a second packets flowing between a server and a terminal apparatus, the second packet being transmitted on a basis of the first packet, calculating a first delay time on a basis of the first and the second packets, the first delay time relating to packet transmission between the server and the terminal apparatus, transmitting a third packet to the core node, receiving a response to the third packet from the core node, calculating a second delay time on a basis of the third packet and the response, the second delay time being a delay time of the core node, and calculating a third delay time being a delay time of an end node on a basis of the first and the second delay times.

Abstract: A packet switch system includes a packet switch appliance having a first network port configured to receive packets, and a first instrument port configured to communicate with a network monitoring tool, a storage system for storing the packets, and an integrated circuit configured to retrieve the packets from the storage system, and retroactively transmit the packets to the first instrument port in a play-back configuration in response to a user's command.

Abstract: Disclosed is a method and apparatus for processing packets in an IPv6 network. A CPE (Customer-Premises Equipment) replaces source address information in an IP packet with external address information after receiving the IP packet from a user terminal, stores a mapping relation between the source address information and the external address information; converts the IP packet into an IPv6 packet, and transmits the IPv6 packet to an NPE (Network-Premises Equipment) via an IPv6 tunnel between the CPE and the NPE; receives a second IP packet from the NPE via the IPv6 tunnel, converts the second IP packet according to destination address information in the second IP packet, replaces the destination address information in the converted second IP packet with the source address information corresponding to the destination address information in the mapping relation, and transmits the second IP packet to the user terminal.

Abstract: A system includes at least one adaptive filter coupled to a first communication channel and at least one other communications channel. The at least one adaptive filter includes at least one set of adaptive filter coefficients. A memory stores at least one predetermined set of filter coefficient thresholds. The filter coefficient thresholds may be indicative of channel faults, channel to channel faults or a length of the channel. A controller is configured to compare the set of filter coefficients to the predetermined set of filter coefficient thresholds. The controller is configured to determine the information about the channels based on compare results.

Abstract: A system and method for determining an optimal backbone for a robotic relay network are provided. A robotic relay network comprising a plurality of nodes including a base station node, one or more mobile relay nodes, and one or more user nodes is provided. A signal strength value for each pair-wise communication link between each of the nodes is identified. A weight function is applied to each communication link value to determine a communication link weight. An optimal backbone tree is determined from the communication link weights.

Abstract: A communication system for propagating time division multiplexing (TDM) fault notifications has a first interworking function (IWF) of a packet network and a second IWF of the packet network. The second IWF detects a TDM fault of a TDM network and transmits continuity check messages (CCMs) to the first IWF. Further, the second IWF controls the CCMs in response to a detection of the TDM fault such that a TDM fault notification is propagated from the second IWF to the first IWF based on the CCMs, and the first IWF propagates the TDM fault notification to a second TDM node via a TDM signal.

Abstract: Described are methods and communications network for carrying pseudowires over packet-switched network. A communication network includes a packet-switched network (PSN), a first provider edge (PE) device in communication with a second PE device through the PSN, and a pseudowire (PW) established between the PE devices for emulating a service across the PSN. The PW has a Virtual Circuit Connection Verification (VCCV) control channel that carries an Ethernet Operations, Administration, and Maintenance (OAM) message. In some embodiments, various data plane encapsulation formats enable a PW to emulate an Ethernet or a non-Ethernet service over an Ethernet PSN. Each encapsulation format includes an Ethernet tunnel header and a PW header that encapsulates an Ethernet or non-Ethernet payload.

Abstract: A switch fabric for a modular router may be tested without connecting the switch fabric portion of the router to the other modular portions of the router. The switch fabric may generate test data units and insert the test data units into one or more elements of the switch fabric. The switch fabric may operate with the inserted test data units. A control component may receive data units from the switch fabric after operation of the switch fabric and analyze the received data units to determine whether the received data units correspond to the inserted test data units.

Abstract: A method for troubleshooting a set top box is disclosed and can include receiving a trouble ticket from a set top box and initiating a self test at the set top box. The method can also include receiving test results from the set top box and analyzing the test results to isolate a problem.

Abstract: A modular switching network node for a communications network, i.e., an industrial communications network, where the modular switching network node comprises a switching network node base unit and at least one port module, the at least one port module comprises at least one connection interface for coupling to the communications network, and where the modular switching network node is configured to forward communication data over one of the connection interfaces of the modular switching network node to at least one additional connection interface of the modular switching network node. The switching network node base unit is configured such that at least one of the port modules is swappable for a functional module to expand the functionality of the switching network node.

Abstract: There are disclosed methods and apparatus for testing a network. A plurality of packets may be transmitted over the network from one or more source port units. Each transmitted packet may include a packet group identifier (PGID) corresponding to a unique combination of values for a plurality of tracking factors. The packets may be received at one or more destination port units. Each destination port unit may extract the PGID from each received packet and may accumulate traffic statistics for each of the plurality of PGIDs. The accumulated traffic statistics for at least some of the plurality of PGIDs may be aggregated to report summary statistics for a selected tracking factor.

Abstract: A method for identifying disruptions using network and systems data includes receiving resource utilization information for a network component at a first time and receiving resource utilization information for the network component at a second time. The method also includes identifying a resource utilization pattern for the network component, predicting a resource utilization for the network component at a third time based on the resource utilization pattern, and determining whether the predicted resource utilization will breach a utilization threshold for the network component.

Abstract: A method and system of managing end-to-end loss in a manner that allows phone calls to be executed across many networks at desirable end-to-end loss levels, including networks having fixed-loss stratagems, by controlling devices to adjust their local loss or gain in order to establish target end-to-end loss.

Abstract: Computer-readable code stored on computer-readable media includes code to allocate at least one data structure in computer memory. The at least one data structure has a plurality of message parameter fields, and each of the message parameter fields has a deterministic position within the at least one data structure. The computer-readable code also includes code to navigate to different ones of the message parameter fields by interpreting non-compiled instructions. The instructions have a form that specifies a position of a particular message parameter field within the at least one data structure, and a number of bits in the particular message parameter field. The position of the particular message parameter field is specified in terms of a number of data offsets in the at least one data structure. The computer-readable code also includes code to configure a communications test-set following navigation to at least one of the message parameter fields.

Abstract: Networks and methods are disclosed for providing an indication of the capability of a communication network for serving special number calls. Before a user places a special number call, the communication network determines the capability of the communication network for serving a special number call, and provides the indication of the network capability to the user. The user is thus kept aware of the quality of the special number service available to them through the communication network.

Abstract: Apparatus for monitoring a packet switched network, the apparatus comprising: at least one port for receiving and transmitting packets; a local clock; and a packet inspector that uses time from the local clock to timestamp packets received at a port of the at least one port, and additionally copies timing information from received timing distribution packets, which are transmitted from a master clock to a slave clock in order to discipline the slave clock, and forwards the received packets for transmission from a port of the at least one port; wherein the apparatus uses the timestamp of a received timing distribution packet and the copied timing information to monitor timing distribution performance of the network .

Abstract: A wired network connection establishing method includes the steps of: configuring two network devices to exchange connection capacity information with each other through first and second twisted pair cables of a network cable, the connection capacity information including at least a first connection mode using four of the twisted pair cables, a second connection mode using three of the twisted pair cables, and a third connection mode using two of the twisted pair cables; configuring the two network devices to detect a number of the twisted pair cables in the network cable capable of supporting a normal connection; and configuring the two network devices to determine which one of the first, second, and third connection modes is to be used for establishing a connection based on the number of the twisted pair cables capable of supporting a normal connection.

Abstract: A system and method provide measurement of round trip delay and jitter in an optical network without adding cost to the components of the network. A method of determining round-trip delay and jitter in an optical network comprises the steps of a) transmitting a test frame over the optical network to a device on the optical network, b) receiving a looped-back test frame from the device over the optical network, and c) determining a round-trip delay measurement using the received looped-back test frame.

Abstract: Multicast capabilities of a link state protocol controlled network are used to accelerate the flooding advertisement of topology change notifications within portions of the network. This flooding mechanism may be particularly efficient in a network with a large number of two-connected nodes such as a ring network architecture. A control plane specific multicast group address is used when flooding topology change notifications, and a process such as reverse path forwarding check is used as an additional control on forwarding of the notification to prevent looping of control plane packets. Two-connected nodes insert a forwarding entry into their FIB to enable frames containing the control message to be forwarded via the data plane on to the downstream node so that propagation of the control message along a chain of two-connected nodes may occur at data plane speeds.

Abstract: Providing for remote field testing of mobile communication devices is described herein. By way of example, network initiated data received at a mobile device or like device activated on a mobile network can be monitored. Further, an over the air (OTA) message sent by the mobile network to the monitored device can be identified and forwarded to a test device. Additionally, an IP gateway of the mobile network can be monitored for mobile originated pull messages or network originated push messages associated with or identifying the test device. A data translator can reconfigure or reroute data to and from the mobile device and mobile network utilizing information associated with the activated device. Accordingly, remote data exchange can be implemented even if the mobile device is not pre-activated on the mobile network.

Abstract: In a network system in which a large number of terminals that transmit information exist and data extraction is performed via a wide area network, when data filtering is performed by using terminals called entrance nodes, existing in front of the wide area network, efficient operation of the entrance nodes is a goal to achieve. In one implementation, when an entrance node has detected an alteration to a configuration of diverse resources attached to it, it updates management information by communicating with other entrance nodes existing in the neighborhood. In a further implementation, through a query and reply exchange about allocations of filtering and quick response processes to be executed by entrance nodes, reallocating process items, pre-filtering of necessary data, and relaying data between entrance nodes are performed.

Abstract: In a redundant system where multiple network interfaces can be switched, an interface switching device includes: a transformer for transforming automatic switch information between a predetermined type used for a predetermined network interface and each of other types used for network interfaces other than the predetermined network interface; a switch controller for performing switch control for automatic switch information of the predetermined type; and a control interface for connecting a first network interface to the switch controller via the transformer when first automatic switch information received from the first network interface is not of the predetermined type.

Abstract: A method may include determining whether a discrepancy exists between scheduling headroom computable by a first device and scheduling headroom computable by a second device, determining one or more load measurements that the second device bases its computation of the scheduling headroom if it is determined that the discrepancy exists, modifying the one or more load measurements, and calculating the scheduling headroom based on the modified one or more load measurements.

Abstract: The communication availability information between a plurality of transmitters and a plurality of destinations before the communication state between a transmitter and a destinations in a communication network changes from available to unavailable is compared, layer by layer from an upper layer toward a lower layer, with the communication availability information after change, and destinations in paths where the communication state has changed from available to unavailable are grouped. Thus, the communication network is divided into a plurality of affected ranges and an interface of a device located at the border between the affected ranges is deduced as a fault occurrence point.

Abstract: A switch fabric for a modular router may be tested without connecting the switch fabric portion of the router to the other modular portions of the router. The switch fabric may generate test data units and insert the test data units into one or more elements of the switch fabric. The switch fabric may operate with the inserted test data units. A control component may receive data units from the switch fabric after operation of the switch fabric and analyze the received data units to determine whether the received data units correspond to the inserted test data units.

Abstract: Methods, port units, and computer readable storage media for testing network connections are disclosed. A plurality of Transmission Control Protocol (TCP) connections with one or remote devices may be established via a network. Metadata may be extracted from TCP packets transmitted via the plurality of TCP connections and TCP packets received via the plurality of TCP connections. The extracted metadata may be stored in a memory.

Abstract: A method and system for analytically simulating the state of a 802.11 WLAN network having a plurality of stations at discreet timesteps, including analytically generating a plurality of sample paths of a network state, including obtaining probability distribution values for aspects of the network. The probability distributions may be precomputed and stored in a cache to be accessed during a simulation of a network.

Abstract: Methods, apparatuses, data structures, and computer readable media are disclosed that represent network devices with encapsulated protocol stacks communicating via a common physical port. The encapsulated protocol stacks include variable combinations of a multiple encapsulation protocols.

Abstract: A method and system for managing resources in telecommunications services and networks. The method and system regard execution of processes by distributed agents on processing machines to perform predetermined tasks on the network, and are characterized by setting target data including goals on processes and constraints on resource utilization to be met by the system; monitoring computational resources utilization and processes execution by agents, and collecting performance data representative of resource utilization and process execution; comparing the collected performance data with the set data, a penalty being established when performance data do not fulfill target data; and re-allocating resources for process execution by agents so as to minimize the penalty determined on the basis of the comparison.

Abstract: A system and method for squelching a recovered clock in an Ethernet network. In one embodiment the invention provides a method for squelching a recovered clock in an Ethernet network comprising a local node coupled to a remote node by a link, the method including receiving a descrambler status signal, receiving a remote receiver status signal, receiving a link status signal, and squelching the recovered clock signal based on the descrambler status signal, the remote receiver status signal, and the link status signal.

Abstract: A networking system may include one or more nodes communicating with each other. The nodes may communicate via one or more links, which a switch or other structure may provide. The networking system may include one or more pools of at least one network diagnostic module. A network diagnostic module may test one or more links and may be configured to rove among a plurality of links. The networking system may include an alarm module.

Abstract: In one embodiment, a network device may have its network interfaces identified as either network-to-network interfaces (NNIs) configured to communicate with other network devices in a first computer network, or user-to-network interfaces (UNIs) configured to provide service to the first computer network for user devices. Based on determining at least one NNI for forwarding upstream traffic to an aggregation device of the first network that connects the first network to a second network, any NNI that is not used for forwarding upstream traffic is deemed a novel “NNI alternate” (NNI-ALT). The forwarding of traffic at the network device may be controlled to provide user isolation between network devices by denying traffic forwarding between UNIs and NNI-ALTs as well as between NNI-ALTs and NNI-ALTs, while permitting traffic forwarding between NNIs and NNI-ALTs.

Abstract: In general, this disclosure describes techniques for testing and verifying the functionality of networks and network devices without requiring the deployment of specialized testing components. For example, as described herein, a device management protocol (e.g., SNMP or NETCONF) typically used for remote configuration of devices has been extended to allow traffic patterns to be seamlessly injected into the existing network devices that form the enterprise network. For instance, a network management device sends configuration data to a managed network device in accordance with a device management protocol and calls, using a test packet parameter, a device configuration function exposed by a managed device. When the device configuration function is called, the managed device processes the test packet to produce a result in accordance with the configuration data as if the test packet had been received from the network, and the managed device returns a test packet processing result.

Abstract: A physical host executes a virtual machine monitor (VMM) that instantiates a source virtual machine (VM). In response to the VMM receiving from the source VM a packet specifying a first destination address of a destination VM and a second destination address of a default gateway, the VMM determines whether the packet can be communicated to the destination VM without the packet being routed by the default gateway. In response to the VMM determining that the packet can be communicated to the destination VM without the packet being routed by the default gateway, the VMM forwards the packet to the destination VM such that the packet bypasses routing by the default gateway.

Abstract: There is disclosed a scheduler for a traffic generator and a method of scheduling traffic. A working memory may stores N respective timer values for N count-down timers, where N is an integer greater than one. An arithmetic and logic unit (ALU) may update each timer value in rotation every N cycles of a clock. A temporal interpolator may delay output data from the ALU by a selectable delay period of 1 to N cycles of the clock.

Abstract: Instead of scanning all the channels at once, the present method separates a channel scanning procedure into multiple channel scanning operations. The method reduces a data loss rate during the operation by returning to the operating channel an associated access point operates on in accordance with a return period for transceiving blocked packets.

Abstract: Method, apparatus, and computer program product embodiments are disclosed to provide for wireless resource sharing between heterogeneous wireless networks to enable coexistence of secondary networks in a TV band white space by grouping two or more of the neighboring networks into subsets based on predefined rules.

Abstract: Methods and computer readable storage media to test secure network connections. One or more pre-calculated encryption data (PCCD) sets may be defined in accordance with a secure communications protocol. The one or more PCCD sets may be stored in a first PCCD memory and a second PCCD memory located respectively within a first port unit and a second port unit of a plurality of port units. Each PCCD set may include at least a first parameter and a second parameter generated by encrypting the first parameter. A simulated secure connection between the first port unit and the second port unit via a network under test may be opened using a selected PCCD set from the one or more PCCD sets without performing decryption processing.

Abstract: Embodiments of the invention provide a system for enhancing user interaction with Interactive Voice Response (IVR) destinations, the system comprising: a processor; and a memory coupled to the processor, the memory comprising: data encoding a database, the database comprising a list of telephone numbers associated with one or more destinations implementing an IVR; instructions executable by the processor for automatically communicating with at least one user; and instructions executable by the processor to pull at least one menu from the database and display the menu to the at least one user, wherein the menu is associated with a telephone number dialed by the at least one user, and wherein the menu comprises at least one icon.

Abstract: An integrated switch tap device for managing and monitoring network traffic is provided. The device includes a set of network ports for receiving and outputting the network traffic. The device also includes a first logic arrangement for performing routing functionalities and a first CPU for processing the routing functionalities. The device further includes a set of monitoring ports that is coupled to one or more monitoring devices. The device yet also includes a first tap module, which is configured at least for intercepting at least part of the network traffic flowing through the network device, creating a copy of at least part of the network traffic, and forwarding the copy to at least one of the set of monitoring ports. The device moreover includes a second CPU configured at least for processing tap functionalities associated with the first tap module.

Abstract: A peripheral device includes: an input/output block connected to a device subject to connection; a communication block configured to communicate with a device subject to communication; and a conversion block configured, if the device subject to communication is a storage device, to convert a storage access command output by the device subject to connection to the input/output block into a communication command that is transferred between the communication block and the device subject to communication, wherein the communication block transmits the communication command generated by the conversion block to the device subject to communication and transfers, with the device subject to communication, one of data that is written by the device subject to connection to the device subject to communication and data that is read from the device subject to communication.

Abstract: A simulator simulates routing system protocols to build routing tables corresponding to a modeled network, and a comparator compares the routing tables in the actual network to these simulator-created routing tables. Because the modeled system represents a fault-free version of the actual system, and assuming that the modeled routing system protocols are representative of the algorithms used in the actual routers, these simulator-produced routing tables can represent steady-state routing tables that should be present in the routers of the actual network at steady state. By querying each router in the actual network for its routing table and comparing each routing table to the corresponding simulator-produced routing table, any differences from the steady state can be identified.

Abstract: The invention relates to a method for carrying out predictive analysis relating to nodes of a communication network. The method comprises the steps of providing communication event information for a first set of nodes and a second set of nodes of the communication network, providing a set of attributes for the nodes of the first set, using said attributes and said communication event information for determining a set of groups among the first set of nodes, assigning each node of the second set to at least one group of the set of groups based at least on the communication event information available for the second group, the assigning resulting in membership information of the nodes of the second set as well as deriving or applying a prediction model for the second set of nodes based on the communication event information for the second set and the membership information.

Abstract: For automatically identifying a failure in a logical circuit in a data network without manual intervention, the logical circuit includes one or more logical connections for communicating data in the data network. A network management module periodically requests trap data indicating the status of the logical connections in the logical circuit. After the trap data has been received by the network management module, the trap data is analyzed to determine whether any of the logical connections has failed. If it is determined that a logical connection has failed, the network management module may wait a predetermined time period to determine whether the failed logical connection has been restored. If after the predetermined time period the logical connection has not been restored, then the logical circuit is identified as having failed.

Abstract: A method and apparatus transmitting and receiving in a real-time system are disclosed. The method of transmitting in a real-time system includes scheduling a task included in a socket based on a predetermined transmission option designated to the socket, and transmitting a packet generated by the scheduled task based on the predetermined transmission option, so that real-time communications of a network communication can be secured and resources of the system can be efficiently used, thereby, transmitting and receiving data according to the required characteristics of transmission and reception.

Abstract: A network statistics processing device comprises a port processing unit for determining an update from a forward statistic metric carried by an input PDU, an arbitration unit for placing the updates into a scheduled stream of updates, and a memory unit for storing statistic totals relating to the network operating parameters. The port processing unit also processes the statistic results retrieved from the memory into reverse statistic metrics that are inserted into an output PDU. A statistics monitoring and processing unit enables performance of high level statistical processing on selected updates and on the results. A method of generating and maintaining statistic totals on a plurality of network operating parameters is also described.

Abstract: An IP telephone or other endpoint device in a network is configured to support a reporting mode of operation that may be entered, for example, responsive to user entry of a report command via a user interface of the endpoint device. In one aspect, the endpoint device stores call information in one or more buffers. Responsive to an instruction to enter a reporting mode, the endpoint device sends contents of the buffer(s) to a report server over the network. The endpoint device may reinitialize the buffer(s) responsive to an instruction to leave the reporting mode.

Abstract: There is provided a method of quantifying a voice quality in a telecommunication system including a first gateway in communication with a second gateway over a packet network. The method comprises deriving speech parameters from a first speech signal of a first talker received by the first gateway over a first communication line and a second speech signal of a second talker received by the first gateway from the second gateway over the packet network, determining a conversational impairment index using the speech parameters, deriving technology parameters based on voice technology and components in the telecommunication system, determining a technology impairment index using the technology parameters, and mapping the conversational impairment index and the technology impairment index into a conversational quality index to quantify the voice quality in the telecommunication system.

Abstract: A programmable access device for use in a network access system includes first and second network interfaces through which packets are communicated with a network, a forwarding table utilized to route packets communicated between the first and second network interfaces, and a packet header filter. The packet header filter identifies messages received at one of the first and second network interfaces on which policy-based services are to be implemented and passes identified messages via a message interface to an external processor for processing. In preferred embodiments, the packet header filter is capable of filtering packets for service processing based upon protocol information pertaining to protocol layers higher than layer 3.

Abstract: Systems and methods for gathering troubleshooting information through one or more networks are disclosed. In one embodiment, the method comprises a switch port configured to receive a frame that has information added by another switch. As the frame traverses the network, control logic in the switch adds additional information into the frame from the current switch.