Abstract: A method for estimating round-trip time (RTT) values for data packets travelling in a telecommunication network is disclosed. During a first time interval (206) which begins with the start of a data transmission, estimated RTT values (14) are generated by filtering a periodic sequence of RTT samples (12) with a self-initializing expanding memory polynomial (EMP) filter (16) and, after a first switch-over time at the end of the first time interval, the estimated RTT values are generated by filtering the RTT samples with a fading memory polynomial (FMP) filter (18). The first switch-over time is determined by comparing an FMP estimation error and an EMP estimation error, where the FMP estimation error is the difference between an output of the FMP filter and the RTT samples, and the EMP estimation error is the difference between an output of the EMP filter and the RTT samples, and triggering the first switch-over time when the FMP estimation error becomes equal to or less than the EMP estimation error.

Abstract: A device may obtain a flow signature, identify a destination collector to which packets bearing the flow signature are sent, obtain a list of potential source collectors that may have sent the packets bearing the flow signature to the destination collector, and identify a source collector, among the potential source collectors, that sent the packets to the destination collector. In addition, the device may output information related to a path from the source collector the destination collector.

Abstract: The present invention provides a receiver, a transmitter, a transmitter feedback device, and corresponding methods. The feedback device includes: a multi-channel frequency selection band-pass circuit, configured to receive a multi-frequency band feedback signal, and output a feedback signal of each frequency band in a time-division manner; a feedback local oscillator, configured to provide feedback local oscillation corresponding to each frequency band in a time-division manner; a mixer, configured to mix the feedback signal of each frequency band from the multi-channel frequency selection band-pass circuit and the feedback local oscillation corresponding to each frequency band from the feedback local oscillator, and output an intermediate frequency signal of each frequency band in a time-division manner. A solution in which only one set of signal processing channels is used to process the signals of multiple frequency bands in the uplink, the downlink or both the uplink and downlink is provided.

Abstract: A programmable device generates a test signal indicative of a RF signal and receives a processed test signal indicative of the test signal after processing thereof by one of a RF transmission system and a RF receiving system. The programmable device performs a comparison between the processed test signal and calibration data, and generates a report based on the comparison. A hardwire signal router provides the test signal to one of the RF transmission system and the RF receiving system, and provides the processed test signal to the programmable device. The router includes a first switching mechanism and a second switching mechanism operating in a coordinated fashion to define one of a first state for testing the RF transmission system and a second state for testing the RF receiving system.

Abstract: Techniques and mechanisms for evaluating I/O buffer circuits. In an embodiment, test rounds are performed for a device including the I/O buffer circuits, each of the test rounds comprising a respective loop-back test for each of the I/O buffer circuits. Each of the test rounds corresponds to a different respective delay between a transmit clock signal and a receive clock signal. In another embodiment, a first test round indicates a failure condition for at least one I/O buffer circuit and a second test round indicates the failure condition for each of the I/O buffer circuits. Evaluation of the I/O buffer circuits determines whether the device satisfies a test condition, where the determining is based on a difference between the delay corresponding to the first test round and the delay corresponding to the second test round.

Abstract: A system and method for providing Connectivity Fault Management, CFM, in a Provider Backbone Bridge Traffic Engineering, PBB-TE, telecommunication network utilizing Ethernet-based packet transport. PBB-TE point-to-point and point-to-multipoint services are identified, and PBB-TE maintenance points (31, 41) associated with the identified PBB-TE services are addressed. The addressed PBB-TE maintenance points are modified by adding a PBB-TE Service Demultiplexer (32, 42) to each PBB-TE maintenance point for identifying independent PBB-TE service instances. Basic CFM protocols are enhanced to duplicate the behavior of CFM protocols on virtual local area network, VLAN, based maintenance associations. The PBB-TE maintenance points may be Maintenance association End Points, MEPs, and Maintenance association Intermediate Points, MIPs.

Abstract: Communication ability between nodes in a cluster-based computer system is tracked to inform applications executing on the nodes of the existence and quality of the endpoint-to-endpoint communications available between the nodes. Communications between a node and other nodes are tracked, and a database records the communication ability between the node and the other nodes for each link between the nodes. The tracking and recording are repeated at the other nodes. A registration by an application executing at a particular one of the nodes to receive notifications of changes in the communication ability with another node over a particular link (or in general) will cause notification of the application when the link status changes.

Abstract: A first instrument port of a packet switch appliance is connected to a first data storage device. A second port is configured as a first network port. A first meta-data tag is created for a first block of packets received through the first network port. The first block is sent to the first data storage device through the first instrument port. The first meta-data tag or copy is sent to the first data storage device and/or a storage management server. A second instrument port of the packet switch appliance is connected to a second data storage device. A second meta-data tag is created for a second block of packets received through the first network port. The second block is sent to the second data storage device through the second instrument port. The second meta-data tag or copy is sent to the second data storage device and/or the storage management server.

Abstract: A method, a system, and equipment for information processing are provided. The method includes receiving information sent by a source eNodeB of UE, where the information includes processing status information and data information which are obtained after the source eNodeB processes data transmitted by the UE, or data information in at least two user plane protocol stacks of the source eNodeB, or data information in user plane protocol stacks except PDCP in the source eNodeB; and correspondingly, transmitting data with the UE according to the processing status information and data information, or the data information in the at least two user plane protocol stacks, or the data information in user plane protocol stacks except PDCP.

Abstract: A method for verifying compliance of a communication device with one or more requirement specifications is disclosed.

Abstract: A method for testing a packet data signal transceiver via its packet data signal interface. The packet data signal interface is used to convey test packet data signals from the test equipment to the DUT, and response packet data signals responsive to such test packet data signals from the DUT to the test equipment.

Abstract: A method and apparatus for evaluating and optimizing a signaling system is described. A pattern of test information is generated in a transmit circuit of the system and is transmitted to a receive circuit. A similar pattern of information is generated in the receive circuit and used as a reference. The receive circuit compares the patterns. Any differences between the patterns are observable. In one embodiment, a linear feedback shift register (LFSR) is implemented to produce patterns. An embodiment of the present disclosure may be practiced with various types of signaling systems, including those with single-ended signals and those with differential signals. An embodiment of the present disclosure may be applied to systems communicating a single bit of information on a single conductor at a given time and to systems communicating multiple bits of information on a single conductor simultaneously.

Abstract: A load test method for a network system in which a plurality of node devices exchange packets via a first switch device by way of a second switch device, includes transmitting a plurality of first packets to the first switch device by a first node device, the plurality of first packets being addressed to the first node device via the second switch device, transmitting a plurality of second packets to the first switch device by a second node device, the plurality of second packets being addressed to the first node device via the first switch device, storing the first packets and the second packets in a queue buffer and thereafter transferring the first packets and the second packets to the first node device by the first switch device, and monitoring state information based on the number of packets waiting to be exchanged in the second switch device.

Abstract: A method of transmitting feedback data in a multiple antenna system comprises receiving a request message of feedback data on a downlink channel, the request message comprising uplink scheduling information, selecting a set of M (M?1) subbands within a plurality of subbands, generating the feedback data, the feedback data comprising a frequency selective PMI (precoding matrix indicator), a frequency flat PMI, a best band CQI (channel quality indicator) and a whole band CQI, and transmitting the feedback data on a uplink channel allocated to the uplink scheduling information.

Abstract: A communication device may include a reference maximum segment size (“MSS”) value acquisition device, a data length acquisition device, and a transmission device. The reference MSS value acquisition device may acquire a reference MSS value from a first device by executing a transmission control protocol communication with the first device. The data length acquisition device may acquire a data length value comprised in a user datagram protocol (“UDP”) header of a frame received by executing a UDP communication with the first device. The transmission device may generate a transmission frame and may transmit the transmission frame to a second device when executing a UDP communication with the second device. The reference MSS value may be an MSS of the first device. A size of the transmission frame may be based on a specific value determined utilizing the reference MSS value of the first device or utilizing the data length value.

Abstract: Embodiments of the present invention provide a method for detecting a sleeping cell and a system including: a network management device and a base station, where the network management device is configured to send a detection command being used to indicate performing a loopback test for the base station, where the loopback test is a test for a cell controlled by the base station; the base station is configured to receive the detection command from the network management device, perform the loopback test for the cell by simulating the user equipment, generate a detection result of a sleeping cell according to a result of the loopback test, and send the detection result of the sleeping cell to the network management device; and the network management device is further configured to determine whether the cell is a sleeping cell according to the detection result of the sleeping cell.

Abstract: A network device including an address move detection unit, a loop detection packet generation unit, a packet parser unit and a loop determination unit coupled to the packet parser unit is provided. The address move detection unit detects whether an address field of a first packet received by the network device is moved. The loop detection packet generation unit generates a loop detection packet if the address move detection unit detects that the address field is moved. The packet parser unit parses a second packet received by the network device to extract an information. Based on the information, the loop determination unit determines whether the second packet matches the loop detection packet so as to determine whether there is any loop existing in the network device.

Abstract: It is described a method for monitoring the operational state of a telecommunication network (100) having a first level (110) comprising a plurality of managed entities (111) and a second level (120) comprising a management system (121) for the managed entities (111) of the first level (110). The described method comprises propagating a first notification (151) within the first level (110) from a first managed entity (111) to a second managed entity (111), and transmitting a second notification (161) from one of the plurality of managed entities (111) to the management system (121). The second notification (161) comprises an information being indicative for the operational state of at least one another of the plurality of managed entities (111). Preferably, the managed entities (111) are arranged within a closed loop (152) such that the first notification (151) is propagating along this loop (152).

Abstract: The performance of a test apparatus for a communications network may be inferred by analyzing a set of performance data results measured on a number of different lines in the network. Once a sample of sufficient size for a particular test apparatus has been created then it is possible to infer the performance of the test apparatus based on the ratio of passes to fails recorded.

Abstract: Disclosed is a loop-back apparatus in wireless communication systems, including: an MAC processing unit configured to transmit a user data and a control frame when a loop-back mode is established; a loop-back unit configured to generate a response frame of a receipt for the user data and the control message transmitted from the MAC processing unit and again feedbacks the generated response frame to the MAC processing unit.

Abstract: An example method involves electrically coupling first and second nodes of a device to a port of a digital subscriber line access multiplexer (DSLAM) and to a first end of a communication circuit. The communication circuit facilitates electrical coupling of the port of the DSLAM to a central office switch at a second end of the communication circuit. A signature circuit is electrically coupled between the first and second nodes to generate a signature signal in response to a test signal injected onto the communication circuit at a second end of the communication circuit. The signature signal has a magnitude substantially proportional to the test signal. First and second conductors of the communication circuit are electrically coupled to respective ones of the first and second nodes. Third and fourth conductors of the port of the DSLAM are electrically coupled to respective ones of the first and second nodes.

Abstract: A network device includes a physical layer transceiver configured to receive incoming data on a data link at an input clock rate and to store the incoming data in a buffer. The physical layer transceiver includes a Media Independent Interface (MII) controller configured to receive the incoming data stored in the buffer and to transmit the incoming data over a MII bus based on a MII clock where the MII clock is a spread spectrum clock. The network device further includes a Media Access Control (MAC) device configured to receiving incoming data from the physical layer transceiver over the MII bus where the incoming data is clocked by the spread spectrum MII clock.

Abstract: This invention relates to a system and method of monitoring, by establishing end to end loopback testing across one or more networks with dissimilar transport technologies. The system allows for connection in loopback mode from a standard interface on a test device to a media adaptor located on an IP-based access network, such as a standard multimedia terminal adapter (“MTA”). End-to-End Quality of service delivered over the transmit and receive path can thus be monitored. Loopback tests are initiated from designated endpoints on the network and made operational by attaching a tag to a telephone number, to allow the gateway to signal connection mode to a call agent. The system and method overcome certain inherent limitations of the MGCP/NCS architecture.

Abstract: A system and method of communicating with a modem via a voice channel of a wireless communication system. The method carried out by the system includes the steps of (a) establishing a voice channel connection between a vehicle telematics unit and call center via a wireless cellular network, (b) generating a modem signaling carrier comprising a single frequency tone together with a speech component, (c) sending the modem signaling carrier over the voice channel connection using an EVRC-B vocoder, (d) establishing a data communication session over the voice channel connection in response to the modem signaling carrier, and thereafter (e) carrying out data communications between the vehicle telematics unit and call center during the data communication session.

Abstract: In one of many possible embodiments, a system includes a session sender configured to define and transmit a sender test packet, and a session reflector communicatively coupled to the session sender. The session reflector is configured to receive the sender test packet from the session sender, determine whether the sender test packet is received by a predetermined time. Upon a determination that the sender test packet is received by the predetermined time, the session reflector is configured to define a response test packet and transmit the response test packet to the session sender. The response test packet is defined to include data for calculating at least one two-way performance metric. In some embodiments, the session reflector is configured to record information for calculating at least one one-way performance metric. In certain embodiments, a fetch client is configured to remotely retrieve the recorded information from the session reflector.

Abstract: 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 signals. Other embodiments are described and claimed.

Abstract: A method and apparatus for evaluating and optimizing a signaling system is described. A pattern of test information is generated in a transmit circuit of the system and is transmitted to a receive circuit. A similar pattern of information is generated in the receive circuit and used as a reference. The receive circuit compares the patterns. Any differences between the patterns are observable. In one embodiment, a linear feedback shift register (LFSR) is implemented to produce patterns. An embodiment of the present disclosure may be practiced with various types of signaling systems, including those with single-ended signals and those with differential signals. An embodiment of the present disclosure may be applied to systems communicating a single bit of information on a single conductor at a given time and to systems communicating multiple bits of information on a single conductor simultaneously.

Abstract: A network system comprises a first communication device having a first address connected, using a network, to a second communication device having a second address. The first communication device includes a monitor frame transmitter configured to generate a monitor frame including the second address as a destination address and the first address as a source address, and to output the generated monitor frame to the network; and a monitoring-response frame monitor configured to monitor reception of a monitoring-response frame sent back from the second communication device. The second communication device includes: a monitoring-response frame transmitter configured to, in response to reception of the monitor frame, generate the monitoring-response frame by exchanging the destination address in the received monitor frame for a source address and the source address in the received monitor frame for a destination address, and output the generated monitoring-response frame to the network.

Abstract: Particular embodiments described herein can offer an electronic device that includes a transmit circuit to form part of a transmit interface, and a receive circuit to form part of a receive interface. The transmit circuit and the receive circuit are to test at least one functional aspect of the electronic device on which the transmit circuit and the receive circuit reside. The transmit circuit and the receive circuit are coupled together by an analog near end loop back connection established through a resistor segment.

Abstract: 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 signals. Other embodiments are described and claimed.

Abstract: A method for receiving signals over a power line network, within the power line network at least one transmitter and at least one receiver communicate via at least two channels, each of the channels having a respective feeding port of the at least one transmitter and a respective receiving port of the at least one receiver, and the receiver having at least two receiving ports. The method determines a channel characteristic of each of the channels, applies a receiving port selection criterion based on the channel characteristic, and selects an excluded receiving port among the at least two receiving ports based on the receiving port selection criterion, the excluded receiving port is not used during further communication.

Abstract: Provided is a test apparatus that tests a device under test, comprising: a plurality of channels that output and receive signals to and from the device under test; a generating section that generates a packet data sequence transmitted to and from the device under test; and a channel selecting section that selects which of the channels is used to transmit the packet data sequence generated by the generating section.

Abstract: An inspection signal to inspect forward-path or return-path communication, is transmitted from a reference node of a network. A response signal is transmitted in a priority class from a node of a forward path to the reference node. In the case of inspection of return-path communication, a replica of the response signal is transmitted in a non-priority class from the node of the forward path to the return path, and the node that receives the replica of the response signal transfers the replica in a priority class to the reference node. In the case of inspection of forward-path communication, a replica of the inspection signal is transmitted in a non-priority class from the node of the forward path to the forward path, and a replica of the response signal is transmitted in a priority class from the node that receives a replica of the inspection signal to the reference node.

Abstract: In an embodiment, an access terminal sends a multicast session registration request to an access network. The access network determines whether to assign a unicast traffic channel (e.g., media access control (MAC) identifier (ID)) to the access terminal, for the access terminal to provide feedback (e.g., channel quality indicators (CQIs) associated with the multicast session, based on a number of access terminals that have been assigned unicast traffic channels for the multicast session and/or for applications other than the multicast session. The access network configures a traffic channel assignment message to include an identifier for the multicast session, and to further include an assignment of the unicast traffic channel if the determining step determines to assign the unicast traffic channel to the access terminal. The access network sends the traffic channel assignment message to the access terminal including at least the multicast session identifier.

Abstract: A networking device of one embodiment includes a processor, a memory, a networking module, and a traffic manager module. The networking module is configured to receive a packet comprising a first header (the first header comprising information identifying a flow), add a second header to the packet (the second header identifying the packet as a test packet), and assign processing rules to the packet based at least on the information identifying the flow. The traffic manager module is configured to remove one of the first header and the second header from the packet and process the packet in accordance with the processing rules.

Abstract: An interface for implementing a loopback configuration which offers improved calibration and/or testing of an electronic system is disclosed. More specifically, embodiments provide a bi-directional interface with at least two portions or partitions capable of communicating data in opposite directions and implementing a loopback configuration between components of an electronic system, thereby enabling more flexible, efficient and effective calibration and/or testing of the electronic system using a single interface. The loopback of the partitioned bi-directional interface may be used to perform data link training and/or electronic system testing. In one embodiment, the loopback configuration of the interface may be reversible. Additionally, the looped or coupled end of the partitions may be switched from one component to another, thereby reversing the configuration of the loopback in one embodiment.

Abstract: A dual homing technique for ensuring loop free transmission of traffic between telecommunication networks such as VPLS by utilizing a loop protocol in the dual homed connection. The technique also provides selective handling of VPLS data streams protected and non-protected by the dual homing loop protocol.

Abstract: Disclosed herein are a data transmission apparatus, a data reception apparatus, and a data transmission method. The data transmission apparatus, the data reception apparatus, and the data transmission method are capable of simplifying the circuit structure of a decoder because an assumption of the time related to a request signal and a data signal is not necessary and an additional logic for generating a clock signal for the decoder is not necessary by using a Finite State Machine (FSM) logic without storing a state via a delay device.

Abstract: A method for detecting loop position in an Ethernet network, includes: the Ethernet switch device learns a MAC address; in a MAC table, a first MAC address corresponds to a first port before the leaning of MAC address, and the first MAC address corresponds to a second port after the learning of MAC address; if the second port and the first port do not belong to the same sub-network, an interval between a time of learning on the second port and a time of transmitting a last packet or receiving a last packet from the first port is calculated; and if the interval is smaller than a predetermined judgment threshold of host migration, it is determined that a loop exists in a sub-network connected to the second port.

Abstract: A method and apparatus for Data Plane Delay KPI Monitoring in a live network is disclosed for measuring node delays in a manner that allows latency to be apportioned to network elements. The method and apparatus for Data Plane Delay KPI Monitoring in a live network includes establishing a call session, propagating a probe session commencement indicator, capturing timestamps for incoming and outgoing packets associated with the call session at the network nodes, propagating a probe session stop indicator which causes the network nodes to cease collecting timestamps and then transmitting the timestamps to a Network Management System.

Abstract: Rehoming a DLSAM between ports residing on a first switch includes establishing a physical loop-back circuit between a second port and a temporary input port of the first switch; establishing an ePVC between the input port and a first port, the first port coupled to a first connection; removing a PVC and establishing a new PVC; routing data between the second switch and the DSLAM via the new PVC, the circuit, the ePVC, and the first connection between the first switch and the DSLAM; removing the circuit from the second port; establishing a second connection between the second port and the DSLAM; routing data between the second switch and the DSLAM via the new PVC and the second connection; removing the ePVC between the first port and the temporary input port; and disconnecting the first connection between the first port of the first switch and the DSLAM.

Abstract: In a ring type network, a master node sends a measurement packet to a slave node in the backward direction and the forward direction, receives the measurement packet which has been circulated among a plurality of slave nodes, stores a received time of the backward direction measurement packet and a sending time of the forward direction measurement packet according to time-keeping of an internal clock, sends a measurement result notifying packet showing a sending time and a received time of the measurement packet to the slave node; each slave node receives the backward direction measurement packet and the forward direction measurement packet, sends the received measurement packet to the next node, stores the received time of the backward direction measurement packet and the sending time of the forward direction measurement packet according to the time-keeping of the internal clock, receives a measurement result notifying packet, calculates a time correction value using the sending time and the received time of

Abstract: A technique is provided for mitigating loops in Ethernet networks. A first port in an Ethernet device receives an Ethernet frame. The frame includes a source identifier, a destination identifier, and a Virtual Local Area Network Identifier (VLAN ID). According to various embodiments, the VLAN ID (VID) has the encoding of both a community group as well as a source bridge ID. A VID database is accessed using the destination identifier and the VID to determine whether the first port has ingress enabled. A filtering database is accessed to determine an egress port for forwarding the Ethernet frame.

Abstract: A method for operating a wireless mesh data network with multiple nodes, wherein data frames are transmitted from a source node via one or more intermediate nodes to a destination node, wherein the source node, the one or more intermediate nodes, and the destination node constitute network nodes of the data network, wherein during transmission of a data frame, at least some of the network nodes which receive the data frame, using a precursor list for the destination nodes which is assigned to the destination nodes of the data frame, check whether the network node sending the data frame is in the precursor list, and wherein in the case of a positive result, the data frame is transmitted to a further network node, and in the case of a negative result, the data frame is thrown out or processed by an error recovery routine.

Abstract: A method and apparatus for Round Trip Delay KPI Monitoring in a live network using a user plane probe session is disclosed for measuring round trip delays in a manner that allows latency to be apportioned to network elements. The method and apparatus for Round Trip Delay KPI Monitoring in a live network using a user plane probe session includes transmitting a loopback packet containing a probe session indicator and capturing timestamps of arrival and departure times at each network element traversed by the loopback packet, and then transmitting the timestamps to a Network Management System.

Abstract: A method of replacing a network demarcation device that isolates an internal transport medium from an external transport medium includes establishing a connection from a service computer to the demarcation device via a service interface of the demarcation device and accessing a storage arrangement of the demarcation device with the service computer. The method also includes using the service computer to select configuration information of the demarcation device and establishing a connection between the service computer and a service interface of the replacement demarcation device. The method also includes using the service computer to cause the selected configuration information to be transferred from the demarcation device to the replacement demarcation device interfacing the replacement demarcation device to the internal transport medium and the external transport medium.

Abstract: A data analyzer operative to be located at a customer premises, causes the transmission of a probing signal into at least one telephone line. The data analyzer computes a parameter that represents a characteristic of at least one telephone line based upon at least a measured reflected probing signal.

Abstract: In one or more aspects data packets are iteratively transmitted to a receiver using predefined spatial mapping matrices, channel estimates are received from the receiver responsive to the iteratively transmitted data packets, and one of the predefined spatial mapping matrices is selected for transmitting additional data packets to the receiver based on the received channel estimates.

Abstract: A system for determining packet quality on an Internet protocol-based (IP-based) network includes a packet test device that traces multiple paths on the IP-based network to obtain node identifiers corresponding to nodes on each path, and an Internet quality monitor (IQM) that associates a quality metric with each path, and associates an identified link between nodes in a path with one of the quality metrics. A method for monitoring quality of data on an Internet protocol (IP)-based network includes deriving a network topology corresponding to a portion of the IP-based network, determining a quality metric associated with a path in the network topology, deriving a link in the path, and determining a quality metric associated with the link based on the quality metric associated with the path.

Abstract: In controlling data packet transmission for a passive optical network, a controller provides memory access and flow control of packet data from a host memory to an external optical network device, such as an optical line termination, optical network unit, or optical network termination. The controller is programmed to control packet data flow through the transmission buffer by resizing the transmission buffer to compensate for increases or decreases in bandwidth demand. For example, the transmission buffer may include a plurality of FIFOs, each of a different transmission container type and each capable of having a different bandwidth allocation, which allocation is changed by the controller in response any one of the FIFO's usage levels increasing above a high threshold or decreasing below a low threshold.