Abstract: A signal measured on a network is associated with one of a plurality of communication devices connected to the network. The designation address of an active communication device that is scheduled to communicate next is determined. The next received signal on the network is associated with the designation address of the active communication device if the signal is received within a maximum response time.

Abstract: A method for a system including a plurality of encoders each for receiving a first signal and encoding to generate a respective second signal for sending to a respective subscriber, comprising receiving, in each encoder, the first signal from a first source, while testing a signal path between a second source and the encoders, the first source on a first assembly, the second source on a second assembly, and each encoder on a respective third assembly, while each encoder is receiving the first signal from the first source, receiving, in each encoder, a third signal from the second source, generating, from each encoder, a fourth signal based on the third signal, the fourth signal being a redundancy signal and receiving and examining the fourth signal at the second source and subsequently receiving the first signal from the second source.

Abstract: The generic device emulator provides an operational emulation of the behavior of any desired device within a device connectivity or other communications protocol as specified in a description of the respective device. This facilitates development and implementation of devices within a device connectivity architecture based on the protocol, since the user has only to define the description of the device. The generic device emulator provides default behaviors for a set of capabilities defined in the description for the device, which can be over-ridden or augmented by user-provided implementation of specific behavior for a capability. The generic device emulator also permits the user to inject defect behaviors, such as to introduce defects in the device's implementation of the protocol.

Abstract: Accumulated proof-of-work approaches for protecting network resources against denial-of-service attacks are disclosed. A client computer or other requester is required to perform work, such as repeatedly hashing a message until a specified number of bits is zero, as a condition for accessing a resource. Proof of the work performed by a legitimate requester is accumulated across multiple requests, so that established users of a resource are not penalized when proof-of-work is used to prevent a denial of service attack. Requesters who cannot show accumulated work greater than a specified threshold are required to perform additional work. In certain embodiments, work may be accumulated only within a specified time window, and the threshold may vary according to resource capacity or loading. Proof-of-work values may be communicated between the user and the resource in cookies.

Abstract: A system, apparatus, and procedure connects customer premises equipment with a service provider network and includes a first local area network, a second local area network, and a management interface device. The first local area network connects the customer premises equipment to the service provider network and is configured to transmit primary service signals to and receive primary service signals from the customer premises equipment. The second local area network connects the customer premises equipment to the service provider network via the management interface device and is configured to transmit diagnostic and/or management signals from the service provider network to the customer premises equipment through the management interface device and/or to receive diagnostic and/or management signals from the customer premises equipment and transmit those signals to the service provider network through the management interface device.

Abstract: A voice over WLAN diagnostic system. In particular implementations, a method includes simulating, in response to a triggering event, Voice over Internet Protocol (VoIP) communications with a remote diagnostics engine; gathering metric data characterizing one or more aspects of the simulated VoIP communications; and periodically transmitting diagnostic packets including the metric data to the remote diagnostics engine; wherein the simulating VoIP communications comprises transmitting diagnostic protocol packets that simulate VoIP communications to the remote diagnostic engine; and intercepting diagnostic protocol packets received from the diagnostics engine.

Abstract: A network troubleshooting framework is described. In an implementation, a method includes detecting discrepancy in operation of a network by supplying data that describes the network to a network simulation so that the network simulation provides an estimation of network performance. A determination is made as to whether the estimation of network performance differs from observed network performance of the network. A root cause of the discrepancy is diagnosed by injecting one or more of a plurality of faults into the network simulation until the estimation of network performance approximates the observed network performance.

Abstract: A method, system, and program for coordinating use of independent external resources within requesting grid environments. A external resource dispatcher receives requests for use of external resources. The external resource dispatcher controls the dispatch of a pool of external resources hidden from the grid management systems of requesting grid clients. In particular, the external resource dispatcher coordinates dispatch of a selection of the external resources for temporary registration with a requesting grid client management system. The requesting grid client management system registers the external resources for use within the grid client and monitors whether the external resources are still needed. When a requesting grid client no longer needs a dispatched external resource, the external resource dispatcher controls detachment of the dispatched external resource and returns the external resource to the available pool of external resources.

Abstract: A packet inspection apparatus is described. In one embodiment, the packet inspection apparatus comprises a packet inspection module to compare data from one or more packets of multiple packets with one or more signatures to identify a match, and at least one network interface modules coupled to the packet inspection module. The network interface module has two ports for forwarding full-duplex traffic therebetween, where the traffic includes packets. The one or more network interface modules forward the packets to the packet inspection module and blocks one or more packets in response to an indication from the packet inspection module.

Abstract: A system and method for providing an early indication of link failure in an Ethernet network. In some embodiments an Ethernet PHY determines a link failure if the PHY loses descrambler synchronization, if remote receiver status is determined to indicate a remote receiver failure, or if link status indicates a link failure.

Abstract: A method and apparatus for testing network performance are provided. In data provided by an application on a first host for transport or communication to an application associated with a second host according to a first data transport protocol is intercepted at the first host and wrapped or encapsulated in a test data packet formatted according to a second data transport protocol. The test data packet formatted according to the second data transport protocol includes, in addition to data comprising all or a portion of the original data packet, instrumentation information. The test data packet is then delivered to the second host, which unpacks the original data packet and the instrumentation information. A response packet containing instrumentation information may be sent from the second host to the first host to provide roundtrip performance metrics.

Abstract: A router (101, 103, 105) includes a communication interface, for receiving a packet (107a-107f), when connected to a communication network. The router (101, 103, 105), for example with a processor, for calculating an alternate path for routing a packet (107a-107f) received from the communication interface while awaiting a determination that a pre-determined path for the packet has failed. According to one or more embodiments, the router (101, 103, 105) can facilitate calculating an alternate path for routing the packet (107a-107f) received from the communication interface while awaiting a first determination that a pre-determined path for the packet has failed and/or a second determination that the pre-determined path is likely to fail.

Abstract: This method of managing malfunctions in a telecommunications network is implemented in a router having a plurality of communication interfaces and a nominal operational routing plan that is duplicated on its interfaces. The method comprises the following steps that are performed during nominal operation: a step of calculating a secondary operational routing plan for degraded modes of operation; and a step of transferring secondary plans to each of the interfaces; and in the event of a malfunction being detected, a step of causing all of the interfaces to switch from the nominal plan to a secondary plan that corresponds to the degraded mode of operation that results from the detected malfunction.

Abstract: Network performability characteristics with improved accuracy are derived by taking into account, in the various analyzed network failure states, attributes of elements at the logical level other than just the capacities of edges, as well as by taking into account one or more “abstract components,” such as scheduled maintenance, and by using multiple traffic matrices.

Abstract: In one embodiment, a device with a wireless transceiver and a network interface, such as a wireless location determination device or a laptop with wireless capability and an Ethernet port, is coupled to a network switch port via the network interface. A request for location data is sent via the wireless transceiver, and location data is provided to the wireless transceiver, enabling the location of the Ethernet outlet to which the switch port is connected to be determined.

Abstract: A remote test unit and method of operation are provided for utilizes the ability of an access matrix ability to route signals. The Remote Test Unit can emulate a central Digital Subscriber Line Modem (DSLM-C) for testing customer premises equipment containing a remote Digital Subscriber Line Modem (remote Digital Subscriber Line Modem). The Remote Test Unit can also emulate a remote Digital Subscriber Line Modem for testing central offices equipment including a digital subscriber line access multiplexer (DSLAM) containing a central Digital Subscriber Line Modem. The Remote Test Unit can also emulate a concentrator connected to the DSLAM, a router connected to the concentrator, an Internet service provider (ISP) connected to the router, and a web site connected to the Internet service provider over the Internet.

Abstract: The present invention provides scalable and rapid Ethernet fault detection which eliminates the requirement to contiguously send heartbeat frames at regular intervals to detect connectivity faults for each Ethernet Path. The present invention generates Continuity Check Message (CCM) frames only when a fault occurs, continues generating CCM frames while the fault remains, and discontinues when the fault clears. The present invention can be utilized with Ethernet Protection Switching to rapidly detect faults. Additionally, the present invention can be used in any Ethernet topology including point-to-point, rings, and the like.

Abstract: A method of fault notification in a carrier Ethernet having the capability of generating and transmitting OAM packets having flag fields, comprises inserting a bit in one of the flag fields to indicate the presence of service-affecting information in the OAM packets, detecting the presence of the inserted bit at the end of a data path, and performing a service protection action in response to the detection of the inserted bit prior to parsing the information in the message. One type of service protection action is protection switching.

Abstract: An automated telecommunications backup system includes a first system operable to monitor a primary time division multiplexing (TDM) link on a TDM network for a failure condition and a second system operable to back up at least a portion of the telecommunications traffic of the TDM link over a backup network. The backup network may be a packet based network, an Internet protocol (IP) based network, a satellite based network, or an IP based system over a satellite network. The first system may continuously monitor the primary TDM link and switch the functionality thereof into circuit with the TDM link upon the detection of the failure condition. The second system may compress the telecommunications traffic of the TDM link to transmit a pre-designated number of time slots thereof.

Abstract: A communication apparatus includes a setting information storage section for storing band information set on each port, a continuity test signal transmitting section for receiving a continuity test request for testing a connection state of a connected network, and transmitting a continuity test signal to a destination port on the transmission path, a setting information obtaining section for obtaining the band information set on a port receiving the continuity test signal from the setting information storage section, a continuity response signal transmitting section for responding a continuity response signal added the band information obtained from the setting information obtaining section to the continuity test signal, to the port having transmitted the continuity test signal, and a setting information notification section for notifying the band information added to the continuity response signal to a node for managing the network.

Abstract: A method for providing an adaptive monitoring process for distributed system containing a plurality of detected events, each of which is associated with at least one causing event. The method comprises the steps of receiving an indication of an occurrence of at least one detected event, enabling the detection of at least one second detected event, the second detected events associated with the detected events are nominally disabled, initiating at least one process for generating at least one second causing event associated with each of the enabled second detected events and identifying selected ones of the at least one second causing events based on the occurrence of at least one corresponding one of the second detected events.

Abstract: A communication method for a network where a plurality of communication devices are interconnected and a plurality of pairs of working channels and backup channels are set in two paths between adjacent communication devices to perform 1:1-protection communications. For information traffic of a type where importance determined by the type of information to be transmitted is relatively high, the 1:1-protection communications is performed by using working channels set in one of the two paths when there is no failure, and by switching to backup channels set in the other of the two paths when a failure is detected. For information traffic of a type where the importance is relatively low, communications is performed by using channels other than the working channels set for the information traffic of a type where importance is relatively high, in the two paths, when there is no failure.

Abstract: A system, method and computer program product are provided. Network traffic information is received from a plurality of controllers. The network traffic information is reported utilizing at least one network-based interface. Further, a map of a network is generated based on the network traffic information. Still yet, intrusion detection services are provided utilizing the network traffic information.

Abstract: The NAT type of a router can be examined by communicating with one server having one IP address, and a P2P communication path is established efficiently using the NAT type obtained by the examination. A terminal 100 transmits a plurality of port number examination request packets having a plurality of port numbers of a server 001 set as the destination port. The terminal 100 refers to a port number examination response packet received from the server 001 to acquire a plurality of port numbers obtained by address translation by a router 101 for the port number examination request packets respectively. The terminal 100 determines the NAT type of the router 101 based on the acquired translated port numbers. The terminals 100 and 200 establish a P2P communication path efficiently using the determined NAT type.

Abstract: This application is directed to systems and methods for surveying a wireless network site. A wireless network receiver or proxy is contacted. One or more client identifiers are received from the contacted receiver or proxy. Coordinate information is also received from the contacted receiver or proxy. The received client identifiers are correlated with the received coordinate information. RF signal characteristic data is received from the contacted wireless network or proxy. Survey data is stored based on the received client identifiers, coordinate information, and RF signal characteristic data.

Abstract: Energy detect with auto pair select for energy management without ‘a priori’ knowledge of the wire pairs connectivity. The energy detect with auto pair select is operable within systems performing automatic detection of connectivity in systems that employ the Ethernet based media dependent interface crossover (MDIX). Where there has been some cross-over of pairs within the system, a situation not uncommon in many networks, the energy detect with auto pair select is operable to perform energy management without knowledge of the pair connectivity. Selection or detection of coupled wire pairs is acquired by energy detection of coupled wire pairs via a state machine that analyzes a qualified energy level.

Abstract: A method of adapting a mobile telecommunication system to channel conditions. To control transmission of a data packet from an access network (AN) in both a link adaptation scheme and an ARQ (Automatic Repeat reQuest) scheme, an access terminal (AT) compares the received power of a forward pilot signal received from the AN with a predetermined first threshold, checks errors in the data packet of a received time slot if the reception power is greater than the first threshold, and transmits a signal requesting termination of retransmission of the data packet to the AN if no errors are found in the data packet after decoding.

Abstract: A method of performance monitoring and a processor for performance monitoring in a communications network are provided. A signal is monitored over time by allocating a current signal quality characterization to the signal, selected from at least two such signal quality characterizations, such as perfect time, errored time and unavailable time. A plurality of time intervals making up a continuous succession of such time intervals are identified, such that a current time interval is terminated and a next time interval is initiated each time the signal quality characterization allocated to the signal changes. Then, a record of each identified time interval is generated and can be used to generate a performance log. Selected records may be manipulated to reduce the amount of memory required to store the records while intelligently degrading their accuracy.

Abstract: A monitoring system provided according to an aspect of the present invention enables a user to specify one or more resource elements as a group, and compute an Abnormality Index that represents the deviation from a baseline operation of these selected resource elements. In an embodiment, the Abnormality Index is computed as a single number. The user may include any desired attributes of each resource element to be considered in determining deviations. The Abnormality Index represents the number of deviations, the seriousness of deviation (e.g., more serious if deviation relates to unavailability of the resource element), and the extent of deviation (i.e., whether the deviation is based on expected operation for hourly, daily or weekly duration).

Abstract: According to one embodiment, an Ethernet switch includes a plurality of ports operable to receive and transmit Ethernet traffic. The Ethernet switch also includes system monitoring software operable to receive an indication from a user of a plurality of fault conditions for which generation of an alarm is desired. The system monitoring software is also operable to monitor the Ethernet switch for the plurality of fault conditions and generate a signal indicating a particular one of the plurality of fault conditions has occurred. The Ethernet switch further includes at least one relay responsive to the generated signal that is operable to turn on a respective alarm indicating a particular fault condition has occurred.

Abstract: One embodiment of the present method and apparatus for determining client-perceived server response time enables a user to accurately measure client-perceived server response time in the presence of packet loss. In one embodiment, the inventive method includes capturing a copy of a first packet traversing a computing network between a client and a server and modifying a server-measured transaction start time to account for a number of packets captured and inferred prior to capturing the first packet. Modifying the server-measured response time in this manner enables the server-measured response time to more accurately reflect the client-perceived server response time, thereby allowing for more accurate assessment of service level agreements, client satisfaction, provisioning and the like.

Abstract: Disclosed is a managing architecture and diagnostic method for remote configuration of heterogeneous local networks, which includes at least one sub-network agent, a local area network (LAN) management module and a remote LAN module. Each sub-network agent manages its sub-networks via its own management protocol, and collects the sub-networks' information. The LAN management module receives the requests from heterogeneous local networks via these sub-network agents, and converts the information associated with each request into a common information module (CIM) to seek a solution for each request. The remote LAN module receives the unsolved requests from the LAN management module via a channel, configures the heterogeneous local networks and uses compatible interface at a remote side to accomplish the management and diagnosis for the heterogeneous local networks.

Abstract: A method for surveilling a telecommunications network link includes disposing a link demarcation device (LDD) at a point on a network link, the LLD dividing the network link into a first network link section and a second network link section, the LDD being configured to perform self-monitoring and monitoring of the first a network link sections, operating the LDD to transmit one of a plurality of unique fault-indicating signals based upon a specific detected fault-indicating condition, wherein each of the unique fault-indicating signals corresponds to a detected fault-indicating condition, detecting the unique fault-indicating signal with a link delimiting device (LLD) communicatively coupled to the LDD by one of the first and second network link sections, and unambiguously identifying the unique fault-indicating signal with the LLD, wherein the unique fault-indicating signals are selected to be readily distinguishable by an existing detection and alarming capability of the LLD.

Abstract: In a network including equipment noncompliant to the topology management protocol, a message substitution response system executing substitution response to a message discovered or topology search message in lieu of the noncompliant equipment is provided. The substitution response module generation unit 22 generates a substitution response module which responds to Discover message and topology search message in lieu of each of LLTD noncompliant equipment for every LLTD noncompliant equipment. The network simulation module generation unit 23 generates a network simulation module for simulating message transmission on the home network. The substitution response functional unit 24 simulates message transmission between the home network and each of substitution response modules, and message transmission between each of substitution response modules by said network simulation module.

Abstract: A method of monitoring network performance is disclosed and includes receiving a session initiation protocol (SIP) response message from one of a plurality of serving-call session control function (S-CSCF) systems at a centralized error monitoring server of an Internet Protocol (IP) Multimedia Subsystem (IMS). The SIP response message includes at least one error code that matches an error monitoring initial filter criterion included in a subscriber profile. The method also includes sending an alert message to a fault management system of the IMS when at least one threshold related to SIP error codes is met or exceeded based on the at least one error code.

Abstract: The invention relates to a method and device for medium-redundant operation of a terminal in a network.

Abstract: Network devices, systems, and methods are provided for packet processing. One network device includes a network chip including logic and a number of network ports for the device for receiving and transmitting packets therefrom. The logic is operable to mirror packets on a per port per virtual local area network (VLAN) membership basis.

Abstract: A packet transmission diagnostic system transmits diagnostic packets during a communications session in which data packets are transmitted between a source and destination. The diagnostic packets elicit responses from routers along a path between the source and destination. The elicited responses, in the form of packets, are used by the diagnostic system to produce one or more packet-delivery metrics for one or more of the routers along a packet transmission path between the source and destination.

Abstract: Where each of switches opposed to each other detects optical-signal shutoff or optical-signal deterioration on the reception side of its port, the switch brings a link of the port down and outputs an auto-negotiation configuration code, as an LAN signal. Upon receiving the LAN signal transmitted from the switch, a repeating-transmission apparatus transmits the transmitted signal to an auto-negotiation monitor. The auto-negotiation monitor performs code analysis for the transmitted LAN signal. Where the auto-negotiation monitor detects that the transmitted LAN signal is the auto-negotiation configuration code, it notifies a monitor apparatus that “The switch detects a failure and the link is down.”, as an alarm.

Abstract: A failure detection protocol is applied so that failure detection requests for the same aggregated link can be processed even when the failure detection requests differ among routing protocols. The failure detection protocol is executed for each of the physical links that form an aggregated link, and a notification is sent to a higher-level application (for example, a routing protocol), which is a requesting source of a communication line failure monitoring request, with a discrimination between a case in which the communication of the aggregated link in its entirety fails and a case in which some physical links of the aggregated link fail.

Abstract: Improved detection of specific BFD LSP path failures is herein disclosed. The improved detection described herein allow for faster fault isolation of a failure along a LSP path, which in turn may allow for faster repair of the failure. When opening a BFD session with a LSP egress node, the LSP ingress node provides the LSP egress node a path descriptor along with the BFD Discriminator. If a BFD failure is detected at the LSP egress node, the LSP egress node can signal an alarm that includes a full description of the path.

Abstract: Faults or degradation of performance of a voice/data communication network (2) are identified without the need to dispatch service personnel by selectively testing isolated sections of the communication network. For some of these tests, the communication network address of a customer's modem under test (106, 114, 60, 66) is retrieved from a database (88) for use in directing these tests to the customer's modem (106, 114, 60, 66) and for emulating the customer's modem (106, 114, 60, 66) during one or more of the tests.

Abstract: A method is provided for determining the integrity of a domain defined in a network. The method includes processes and systems to facilitate the discovery a conceptual ring topology of the domain in the network, and the determination of the integrity of the domain based on the conceptual ring topology that was discovered.

Abstract: An ultrasound diagnostic imaging system (10) is provided with its own onboard network analyzer (34). When a problem with a network to which the ultrasound system is connected is discovered, the network analyzer is started on the ultrasound system. A test is run by transmitting DICOM data from the ultrasound system to another device on the network. The network analyzer is operable in a listening mode to produce a capture file of the raw packet data concerning the DICOM transmission and to present the capture file to a user for analysis such as by parsing out the DICOM communication data on the network.

Abstract: An apparatus is provided for remotely monitoring and testing network elements using a broadband communications network which may be a digital subscriber line network. One or more network elements may be in communication with a remote terminal device via a network gateway over the broadband communications network. The remote terminal device may be configured for communicating commands for monitoring and testing the network elements and for retrieving graphics responsive to the testing commands, generated by the network elements, via the network gateway over the network interface. The retrieved graphics may then be displayed to a user of the remote terminal device to provide an indication of a status of the tested network elements. The apparatus may further include a communications adapter in communication with the network gateway for enabling voice communications over the broadband communications network with network element sites where the network elements are located.

Abstract: A WLAN (Wireless Local Area Network) transmitter or another data communications apparatus is provided that includes a transmission section that is configured to generate signals to be transmitted, and a control section that is connected to the transmission section to control the transmission section dependent on at least two transmission parameters. The control section comprises a state transition controller that is configured to step through a plurality of predefined control states. The control section is configured to apply different transmission parameter modification mechanisms in different control states. The state transition controller is configured to determine the respective next control states based on transmission success and failure statistics.

Abstract: A multicast test of an Internet Protocol (IP) network is performed with an initial multicast probing frequency. The multicast probing frequency of the multicast test is increased, and an impairment of the IP network based on the multicast test is detected based on the multicast test. Based on detecting the impairment, a unicast test is performed at one or more segments of the IP network. Based on the unicast test, an impaired segment of the IP network is identified.

Abstract: A problem detection and repair system receives a trouble indication indicating a problem with a network. The trouble indication may be the result of automated monitoring of the network, or a user of communication services contacting an operator of the network to report trouble. Communication services may include telephone service, television service, Internet service, and other services delivered via a network. The trouble indication may be paired with the user's account, and one or more status determinations may be made prior to handing the user to a support person. Based on the results of the status determinations, problems may be detected, and repairs automatically attempted. If needed, the user may be forwarded to a support person along with the results of the status determinations and any attempted repairs.

Abstract: In a method for notifying a first network unit of an interruption in a transmission of data of a service on part of at least one second network unit over a communications network, at least one signaling message, which contains at least one parameter concerning a notification during an interruption in the transmission of data of a service on the part of the at least one second network unit, is transmitted by the first network unit to at least one third network unit. In the event of an interruption in the transmission of data of a service on the part of the at least one second network unit, at least one notification message is sent to the first network unit by the at least one third network unit according to the at least one parameter.

Abstract: An apparatus for testing, measuring, and monitoring operation of a set of pieces of equipment, the apparatus comprises a topology network piggybacked on the set of pieces of equipment; and a controller, coupled to the topology network for communication over the network.