Abstract: Disclosed is a feedback control method in closed-loop transmit diversity in which feedback information representing amounts of amplitude and phase control is transmitted from a mobile station to a radio base station. The mobile station receives downlink pilot signals, which are transmitted by a handover-destination base station, during handover control, calculates feedback information, which represents amounts of amplitude and phase and phase control transmitted to the handover-destination base station, beforehand based upon the pilot signals received, and transmits the feedback information to the handover-destination base station before completion of base-station changeover by handover.

Abstract: A method for measuring perceptual quality of voice signals, audio signals, audio-video signals, and multimedia signals in communication equipment in an operational embodiment communicates a processed test signal via a network from a first device to a second device. The processed test signal is then received by an equipment under test, which further processes the processed test signal to recover a representation of the test signal. The recovered test signal is then objectively analyzed to determine a measure of perceptual quality by comparing the recovered test signal to a pre-stored representation of the test signal. A quality measurement unit that conveniently attaches to equipment under test identifies and evaluates quality of recovered test signals communicated from a remote device, or a test signal communicated by the equipment under test.

Abstract: A method and system for determining the connectivity of a virtual private network IP security (IPSec) tunnel between two network elements by originating a plurality of connection tests between the network elements. The first network element transmits a connectivity test message to the second network element over the secure tunnel upon receipt of an initiate connectivity test command. The secure tunnel includes two unidirectional tunnels. The second network element receives the connectivity test message over the first unidirectional secure tunnel and transmits a response back to the first network element over the second unidirectional secure tunnel. The number of successful responses received from the second network element are accumulated and the results are reported back to the source of the connectivity test command.

Abstract: According to some embodiments, an integrated circuit is powered with link pulse energy.

Abstract: A radio communications system of this invention is configured to control transmission power of a shared control channel for transmitting control signals to a plurality of mobile stations. The radio communications system has a transmission power controller configured to control the transmission power of the shared control channel, in accordance with transmission power of a dedicated channel accompanying the shared control channel, and communication quality of the shared control channel.

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: To realize an antenna apparatus capable of measuring a calibration factor accurately and further, capable of estimating an arrival direction of a received signal by composing a calibration circuit by using a directional coupler. The antenna system includes L-number of branch units, a calibration circuit and an operating unit. Each directional coupler composing the calibration circuit is structured symmetrically. Measuring the received signals Yti, i−1 and Yti, i+1 of i−1th and i+1th receivers, respectively, when an ith transmitter transmits a signal, on the basis of the first branch unit, the operating unit calculates a calibration factor at the ith branch unit as Hi=T1Ri/(TiR1)=Yt12Yt23−Yti−1,i/Yt21Yt32−Yti,i−1.

Abstract: A method of checking communication-path data in a system, in which a router connecting first and second networks operating on different protocols is connected to a switch of the second network, includes the steps of changing the router and the switch from a normal mode to a test mode, checking consistency between router communication-path data controlled by the router and switch communication-path data controlled by the switch by sending the router communication-path data to the switch during the test mode, and checking communication between the router and the switch by sending cells from the router to the switch and returning the cells from the switch to the router during the test mode.

Abstract: A network component for processing a packet can include a buffer configured to receive a packet, a forwarding unit configured to forward the packet received at the first buffer to a loopback port, and a transmitting unit configured to transmit the packet out of the loopback port. In addition, the network component can include a loopback unit configured to loop back the packet into the loopback port, a first identification unit configured to identify an egress port, and a second transmitting unit configured to transmit the packet looped back from the loopback port out of the egress port.

Abstract: A TCP communications performance measuring device 2 obtains an effective bandwidth (a transfer speed) representing performance in TCP communications, wherein performance indexes or both of a round trip time and a maximum segment size which are obtained based on TCP communications variable-length packets transmitted and received pursuant to a TCP (Transmission Control Protocol) defined as protocol of a transport layer of the OSI Reference model, and any one of an average congestion window size, a packet discard rate and a packet discard event rate. The measuring device 2 therefore includes a packet monitoring unit, a performance index detecting unit 22, a session management unit 23, a session management table 24 and a performance calculating unit 25. The measuring device 2 is capable of measuring the performance in the TCP communications on a communications route of a network without specially transmitting the multiplicity of measurement-oriented packets to the network.

Abstract: Disclosed is a signal processing method and apparatus in MIMO system. In a mobile communication system having a plurality of transmitting antennas, the present invention includes the steps of receiving a feedback signal including status information of at least one channel, segmenting one of the first data blocks to segment into at least one or more of the second data blocks, attaching a CRC to each of the at least one or more of the second data blocks, allocating the at least one or more second data blocks to a plurality of the transmitting antennas, respectively, and transmitting the at least one or more of the second data blocks. In a mobile communication system having a plurality of receiving antennas, the present invention includes the steps of receiving at least one data block including a CRC or dummy bits, acquiring channel status information using the CRC or dummy bits, and transmitting the channel status information.

Abstract: Systems and methods for obtaining logical layer information in a frame relay and/or asynchronous transfer mode (ATM) network are described. In an exemplary embodiment, a physical layer test system, such as an integrated testing and analysis system, communicates with a broadband network management system, which in turn communicates with an element management system for a frame relay and/or ATM network.

Abstract: The present invention relates to a node connection test method and a recording medium by which a test can be carried out in a system having a plurality of nodes (network connecting devices such as personal computers and workstations) connected to a network such as a LAN (Local Area Network) or WAN (Wide Area Network). A testing program used in the method of the present invention includes two independent programs, a transmission program and a reception program. A loopback test is performed between the transmission program and the reception program, thereby confirming normality of the network.

Abstract: An Explicit Congestion Notification (ECN) method is disclosed for wireless applications to avoid network congestion in a TCP/IP packet-switched network. Such method comprises transmitting, at a source node, data packets to a destination node, via at least an intermediate node; determining, at the intermediate node, if an incipient congestion is encountered, setting a Congestion Experienced (CE) flag in each data packet to notify congestion; sending, at the destination node, an ECN-Echo acknowledgment packet back to the source node to inform congestion; reducing, at the source node, a congestion window and a transmission rate to avoid congestion; if the packet loss is due to congestion, re-transmitting, at the source node, only a lost packet to the destination node; alternatively, if the packet loss is due to transmission error, re-transmitting, the lost packet to the destination node, while increasing a round-trip timeout but maintaining the same congestion window.

Abstract: In a communications network, which may be a broadband optical network, a packet is transmitted from a source node to a destination node on a looped signal path. A return signal, which may function as an acknowledgement of the original signal, is transmitted back to the source node from the destination node in the time slot which was occupied by the original packet.

Abstract: A system and a method for maintaining operation of a signaling interconnection between a first ring network and a separate second ring network. Each ring network comprises two communication paths transmitting data in opposite directions and at least two nodes connected to both communication paths. The networks are interconnected via two adjacent gateways, which receive data from the two communication paths on one network, and transmit the data onto the other network directed away from the other gateway. Data traffic is stopped in both directions in an inactive segment on each ring network, so that a node situated on a ring network receives traffic from only one of the two gateways.

Abstract: A transceiver module having integrated eye diagram opening functionality for reducing jitter is described. The transceiver module may include a transmitter eye opener and a receiver eye opener integrated in single circuit. The transceiver module may also include serial control and various other integrated components. Other functionalities that may be integrated on the transceiver module include loopback modules, bypass features, bit error rate testing, and power down modes.

Abstract: A method and system for distributed processing of traffic in a telecommunications node includes receiving a traffic stream at a line card of the telecommunications node. The traffic stream includes a plurality of discrete cells. The cells are forwarded from the line card to a centralized switch of the telecommunications node. The centralized switch identifies cells that are of a particular type. Cells of the particular type are returned from the centralized switch to the line card. The returned cells are processed at the line card.

Abstract: To reduce the possibility of a data-induced latching loopback, a digital data services device integrates one or more digital control code-based filtering routines into a test code sequence-based latching loopback scheme. The filtering routines include a ‘garbage’ byte detection routine, a ‘protected loopback’ routine, and a ‘preamble’ routine. The ‘garbage’ byte detection routine is an intra-loopback establishment filtering routine that limits the type of customer data that may be received between sequences of repeated control bytes of a valid latching loopback sequence. The ‘protected loopback’ routine is a flag byte-based filtering routine for frame relay data, which controllably disables latching loopback for a prescribed period of time, whenever a predetermined character associated with frame relay customer data is detected.

Abstract: Methods and apparatus for providing enhanced telecommunications services troubleshooting in multi-carrier telecommunications networks are described. Troubleshooting information gathering is initiated by launching a “Test Service Call with a Travelling Log”. The Travelling Log acquires data from enabled intelligent network elements in each carrier network through which a Test Service Call is routed. The Travelling Log entries permit information posted to the Travelling Log to be relayed back to network management personnel. Network management personnel equipped with network management system terminals or customers, as appropriate, can initiate the Test Service Call with Travelling Log. The enabled intelligent network elements may include any element in NB/BB PSTN/ISDN with TDM, ATM, Internet, or SONET transport capabilities. The advantage is a cost-effective enhanced troubleshooting information retrieval system operable across service delivery carriers in multi-carrier telecommunications networks.

Abstract: The present invention measures the quality of a transmission channel by utilizing voice recognition technology in a novel manner.

Abstract: A priority auto-control method of signal routes in a No. 7 signaling network is disclosed. In a preferred embodiment, it can improve usefulness and efficiency of the No. 7 signaling network by newly defining a MHT message and a MHA message in accordance with a MTP signal message standard form. It then performs a test of the all available signal routes from an originating point to a terminating point by using the MHT and MHA message. It thus automatically optimizes the priority of the signal routes in accordance with a state change of the signaling network, without requiring operator intervention.

Abstract: A bit stream multiplexer includes an input ordering block, a plurality of multiplexers, an output ordering block, and a loop back circuitry. A bit stream demultiplexer includes an input ordering block, a plurality of demultiplexers, and an output ordering block. During testing, the transmit multiplexing integrated circuit and the receive demultiplexing integrated circuit are coupled into a circuit tester. Then, a plurality of input lines of the transmit multiplexing integrated circuit are coupled to a plurality of output data lines of the circuit tester. A loop back output of the transmit multiplexing integrated circuit is then coupled to a loop back input of the receive demultiplexing integrated circuit. A plurality of output lines of the receive demultiplexing integrated circuit are coupled to a plurality of input data lines of the circuit tester.

Abstract: A physical layer communications device including a receiver connected to a physical channel. A transmitter is also connected to the physical channel. A selector reflects a packet received by the receiver from a remote sender over the physical channel back to the sender when the physical layer communications device is in a diagnostic mode.

Abstract: A method and apparatus for measuring network performance and performing stress analysis are disclosed. The disclosed method and apparatus measure system delays through a network while selectively placing loads on nodes in the network. Each node in the network recognizes and processes a directed load/performance message (DLP) that travels along a specified route and measures the delays within the network. The directed load/performance message is a self-guided packet that traverses the network along a path specified by the initiator of the message. Each node inserts its current (local) time into the directed load/performance message as the node processes the DLP message on both the forward and reverse legs of the specified path. The delay seen by each node in the network can be obtained by subtracting the time-stamps inserted in the message by each node as the node processes the message in each direction.

Abstract: A mobile station comprises means (301, 302, 303, 304, 326) for receiving downlink data from test equipment and means (331, 310, 311, 312, 313) for sending uplink data to the test equipment. To test data channel operation a test loop (204, 332, 333) is established to loop downlink data received from the test equipment back to the uplink direction to the test equipment. During the test, the reception of downlink data and transmission of uplink data in the mobile station are controlled by a relatively low protocol level.

Abstract: A communication network system comprises ring systems (A, B, C, D) and a common node device 20 that is connected in common to ring circuits (5A, 5B, 5C, 5D) of each of the ring systems (A, B, C, D) and that gathers data from each of the ring circuits (5A, 5B, 5C, 5D) relaying it to a relay circuit 30. The common node device 20 accommodates virtual channel paths within all the ring circuits (5A, 5B, 5C, 5D) by means of a virtual path switching path. The relay transmission is realized by means of virtual path switching control that uses this common node device 20 and virtual channel switching control that uses each of the ring nodes within the ring circuits (5A, 5B, 5C, 5D).

Abstract: A tester for testing communication links in a network which carries data frames between communications ports having respective station addresses includes a plurality of communications ports and a test data generator for generating test data frames to be transmitted via the communications ports. A store holds a plurality of sets of predefined station addresses to be associated with the communications ports. A selector receives an indication of user selection of one of a plurality of test modes of the tester, and selects in accordance with that indication a respective one of the sets of predefined station addresses for association with the communications ports. The selector may also receive an indication of user selection of one of several test modes, and select a respective mode of operation of the communications ports and of the test data generator.

Abstract: A method and apparatus for link state determination in voice over frame-relay networks. In one embodiment, the present invention includes a method for determining link state for permanent calls in an FRF.11 voice over data network at the virtual voice channel level. This is a capability not present in FRF.11, which includes a management mechanism for determining link state of virtual circuits, but no mechanism for determining link state of virtual channels. One embodiment uses a standard FRF.11 signaling frame with a status indicator bit to signal that a channel is a primary operative channel or an alternate operative channel. The signaling frames are sent end to end through the network by an initiator device along a primary data path and all alternate data paths. If a primary or alternate path is operative, a reciprocator device returns the signaling frame along the operative path. The initiator determines by receipt or non-receipt of the signaling frames which paths are operative at any time.

Abstract: A signal loopback device including a multiplexing/demultiplexing unit to carry out multiplexing/demultiplexing between a DS3 signal serving as a digital signal conforming to a DS3 C-bit parity system and a DS1 signal, a DS1 signal loopback storage unit to return the DS1 signal, a DS3 signal loopback storage unit to return the DS3 signal in an original input signal format, a selecting unit to select any one of DS3 loopback signals from the multiplexing/demultiplexing unit and the DS3 signal loopback storage unit, a protected detecting unit to output, when detecting loopback execution/cancellation information a plurality of times, a result of detection showing that loopback is to be executed or canceled, and a loopback control unit to make a control for loopback execution or loopback cancellation to the DS1 signal loopback storage unit, the DS3 signal loopback storage unit, and the selecting unit depending upon the result of detection.

Abstract: A technique for detecting and responding to a loopback condition on an ISDN PRI of a telecommunications switching system. The technique involves storing the Call Reference Value of the most recently transmitted call SETUP command as the Last Sent CRV. An incoming call SETUP command is considered to have looped back when it is assigned a Call Reference Value identical to the Last Sent CRV, and it requests a PRI channel that is occupied. The PRI is considered to be in a loopback condition after a predetermined number of call SETUP commands have looped back. The PRI can be removed from service while the loopback condition persists.

Abstract: A method for processing cells at a user-network interface with automatic identification of virtual circuit identifiers and a testing function is provided. The method includes distinguishing the source of the cell. When the cell is from a first source, the method tests the cell against at least one selected criteria. When at least one test determines the cell is invalid, the cell is marked. When the tests determine that the cell is valid, the method translates a virtual circuit identifier to a default setting and forwards the cell to a queue for further processing.

Abstract: A communication control method inclusively having test function for testing or checking the operations of the communication control equipment at the physical layer in the ATM communication. This communication control method is applied to a communication control system in which data cell sent from an ATM layer control unit is inputted to the transmission system to convert it into frame data to transmit it to the transmission line, and frame data sent from the transmission line is inputted to the receiving system to convert it into data cell to transmit it to the ATM layer control unit, thus to allow data cell inputted to the transmission system to undergo loop-back to deliver it to the receiving system. In the transmission system, the method comprises respectively generating idle cell and test cell, whereby when data cell sent from the ATM layer control unit is delivered, this data cell is outputted, when output of test cell is designated from the external, e.g., host computer, etc.

Abstract: In a digital bus, such as the IEEE 1394 serial bus, the procedure for sending data from a link layer IC onto the data bus is that the link layer IC requests access to the bus and then waits until the physical layer IC grants the desired access. Upon detecting the grant status, the link layer IC is free to send data onto the bus. But if in the meantime the link layer IC refrains from sending data onto the bus, the granted bus access will not be given up. As a consequence the bus is blocked for an indefinite time period because the bus access granted cannot be overwritten by the physical layer IC. According to the invention an additional timer function is implemented in the link layer IC. This ‘bus grant missed’ timer function controls the link layer IC in such a way that it automatically gives back the bus control to the physical layer IC after a predetermined time period has elapsed during which the link layer IC has sent no data onto the bus.

Abstract: A method for qualifying a local loop for digital subscriber line service includes transmitting signals from a customer modem and receiving corresponding reflected signals. The loop qualification test is initiated at the customer side, with the test result for the loop qualification test being based on reflected signals that correspond to signals transmitted over the loop from the modem.

Abstract: A bit error rate test (BERT) system is configured as a field programmable gate array that emulates multiple independent BERT generators. The BERT generators produce test frames containing test pattern codes associated with respectively different time division multiplexed (TDM) digital communication channels, that are not necessarily mutually contiguous within a plurality of TDM timeslots of a network communication frame serving digital communication circuits. A framing unit assembles the test code patterns into a test frame and transmits the test frame over a serial network interface to a plurality of digital channel units of a channel bank. The framing unit also interfaces contents of test code patterns within test frames returned from the channel units over the serial network interface with a plurality of data channel-specific virtual BERT receivers, associated with respective digital communication channels.

Abstract: The quality and performance of the connectionless communications system are improved. When a BOM is received, the destination address DA of the L3-PDU stored in the payload of the BOM is retrieved, and the tag information is obtained from the DA (S11). The output message identifier MID is reserved (S12), and the tag information and output MID are assigned to the BOM (S13). Then, the tag information and output MID are written to the table. When a COM is received, the tag information and output MID are retrieved using the MID of the COM as a key, and the information is provided for the COM (S31 and S32). When an EOM is received, the tag information and output MID are retrieved using the MID of the EOM as a key, and the information is provided for the EOM (S41 and S42). Then, the output MID is released (S43).

Abstract: An ADSL subscriber processing equipment in ATM switch is provided. The ADSL subscriber is connected with ATM layer processing device by transmit-receive cellbus and control signal bus and is connected with a number of ADSL subscribers by ADSL line. The ADSL (asymmetric digital subscriber line) subscriber processing equipment in accordance with the present invention includes transmit-cell processing means ATM physical layer processing means ADSL processing means receive-cell processing means and central control means.

Abstract: Disclosed is a method for setting a transfer mode in a line interface device for supporting at least two modes.

Abstract: Techniques to test performance of terminals and access points in CDMA data (e.g., cdma2000) systems. A framework of protocols and messages is provided to support systematic performance testing of terminals and to ensure interface compatibility. The framework comprises a Forward Test Application Protocol (FTAP) for testing forward channels and a Reverse Test Application Protocol (RTAP) for testing reverse channels. Techniques are also provided to (1) test different types of channels (e.g., traffic channels as well as auxiliary channels), (2) test bursty data transmissions, (3) support “persistence” testing (i.e., continued testing over connection and disconnection), (4) force the settings of certain auxiliary channels (e.g., so that the error rate of the channels may be determined), and (5) collect, log, and report various statistics that may be used to derive performance metrics such as throughput and packet error rate.

Abstract: A reference frequency is distributed through a packet-based network to remote elements in a system. Timing packets are periodically sent from a master timing element, to be received by at least one peripheral timing element. Echo messages are sent to the master timing element by each peripheral timing element after a unique delay, in response to the reception of a timing packet. Loopback delay measurements are included in each timing packet for each peripheral timing element. Each peripheral timing element locks a loop using only timing packets which incur a minimum loopback delay.

Abstract: A control link establishment code sequence for interrogating a network element interface (NEI) device terminating a local digital data services loop of a telecommunications network has an in-band code exclusive of codes currently employed to represent functional operations to be executed by a channel unit. Once a virtual link is established, a command—response mode session is conducted. To provide for byte alignment over the local loop for remote provisioning protocol employed at various violation mode rates, each command—response code byte is repeatedly transmitted, and a ‘delimiter’ byte is interleaved with successively repeated ones of the same code byte. Response messages from the NEI device also have code repeats interleaved with the delimiter byte.

Abstract: A telecommunications network such as an ATM, Frame Relay or packet based network will be better managed by identifying nodes through which a virtual connection is routed between two end nodes. A new method of tracing the nodes on the route includes sending trace cells downstream of a monitoring node toward one or both end nodes. Each downstream node either loops back a trace cell identifying itself to the monitoring node or forwards the trace cell further. A plurality of trace cells sent along the route identify nodes located thereon. In one embodiment, the trace cell is an extension of the ATM FMOAM cell (ATM Fault Management OAM cell) specified for loopback functions.

Abstract: A system and method of testing processor boards in which a test path is created by setting switches in distribution hubs and the devices under test. Test signals are sent through the test path and errors in the signals are used to identify faulty boards. The distribution hubs of an embodiment can detect, report and eliminate errors in the test signals. A command path from a host to the distribution hubs and devices under test is provided through a multi-terminal connector. The command path is preferably separate from the test path. A test signal generator may be included. The system may be particularly adapted for fiber channel testing.

Abstract: A redundant communication system contains a principal transceiver and a back-up transceiver to be controllably substituted for the principal transceiver. A monitor protection switch, which controls swapping the two transceivers, has an RF loopback test circuit that is switchably coupled to whichever transceiver is the backup. The RF loopback test circuit monitors the operational capability of the back-up transceiver, and provides an indication of its functionality. If the back-up transceiver is defective, corrective action can be taken in advance of a potential operational failure of the principal transceiver. As long as the RF loopback test circuit indicates proper operational capability of the back-up transceiver, the redundant transceiver can be immediately switched in place of the principal transceiver.

Abstract: A system and method for calculating round trip delay (RTD) values in a switched digital network such as an asynchronous transfer mode (ATM) network. A loopback cell such as an ATM operation and maintenance (OAM) cell is used to carry a delta value through the network. The delta value, which represents a processing interval at a loopback node or an intermediate node, is calculated utilizing timestamps generated at specific ingress and egress ports of network nodes. Cell Transfer Delay (CTD) and Cell Delay Variations (CDV) values are calculated based on the measured RTD.

Abstract: Described is a method extending the OAM functionality in the RPR networks through a new OAM loopback procedure of request-reply type together with the definition of a new RPR OAM loopback frame. The OAM loopback function allows any RPR station to check the reachability of another RPR station. It is not necessary to stop any data traffic communication on the network in order to perform this function.

Abstract: An optical transceiver 1 comprises first and second pseudo-random pattern generators 23 and 28 for generating a pseudo-random pattern signal, which are placed in a transmitting side path 6 and in a receiving side path 11 of the optical transceiver 1, respectively; first and second pseudo-random pattern detectors 21 and 26 for evaluating an inputted pseudo-random pattern signal, which are placed in the transmitting side path 6 and in the receiving side path 11 of the optical transceiver 1, respectively; a first loopback path 31 that loops back from a multiplexing circuit 3 to a demultiplexing circuit 8; and a second loopback path 32 that loops back from a light-electricity converter 7 to an electricity-light converter 4.

Abstract: A method and apparatus for automated sectionalization of a DS1/DS3 data path based upon information received at a single location along the path. A test and monitor device is located at a point of demarcation between an LEC and an IEC. A Remote Module is located at a point of demarcation between the LEC and CPE. The test and monitor device is fully ANSI compatible. The information that is received is processed in a three step process in order to generate a “Sectionalizer Report”. In preparing the Sectionalizer Report, the information output from a filter is used to determine where particular Events originated.

Abstract: Method and circuitry for performing a line loop back test includes a receiver, a deserializer, and a low speed parallel loop back data multiplexer selects either the low speed parallel data from the deserializer when in loop back mode or low speed parallel input data when in normal mode. The deserializer produces a low speed clock output signal that is fed to a low speed loop back reference clock multiplexer and also to a low speed loop back clock multiplexer. Both the loop back reference clock multiplexer and the loop back clock multiplexer select the low speed clock output signal from the deserializer when in line loop back mode. A clock multiplying unit converts the output of the low speed loop back reference clock multiplexer into a high speed clock signal. The serializer generates the high speed serial transmitter data in synchronization with the high speed clock signal received from a clock multiplying unit.