Patents Examined by Maikhanh Tran
  • Patent number: 6690643
    Abstract: In a communication network system that is capable of multipoint connection from one switch to a plurality of other switches, to provide an efficient method of rerouting connection in multipoint connection. There is provided a method of rerouting connection, if there is a first other switch that cannot receive multipoint connection request information from the one switch, the method comprising the steps of: receiving in a second other switch first multipoint connection request information sent from the one switch; generating in the second other switch second multipoint connection request information to the first other switch by using the first multipoint connection request information; sending the second multipoint connection request information generated in the second other switch to the first other switch; and performing prescribed multipoint connection processing in the first other switch by using the second multipoint connection request information sent from the second other switch.
    Type: Grant
    Filed: May 21, 1998
    Date of Patent: February 10, 2004
    Assignee: Fujitsu Limited
    Inventors: Tatsuya Shoho, Yasuhiko Uchida
  • Patent number: 6657990
    Abstract: A system is provided that establishes communication between a first system and a second system. A request is received to establish a connection between the first system and the second system. The system establishes a first connection between the first system and the second system. The first connection is capable of communicating visual data between the first system and the second system. The system also establishes a second connection between the first system and the second system. The second connection is capable of communicating audible data between the first system and the second system. The first system and the second system communicate using both the first connection and the second connection. The first connection can include a network communication link such as an Internet communication link. The second connection may include a telephone communication link capable of communicating telephony signals between the first system and the second system.
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: December 2, 2003
    Assignee: Aspect Communications Corporation
    Inventors: Venkatachari Dilip, Janardhanan Jawahar
  • Patent number: 6628609
    Abstract: The present invention relates to a switch for processing data units, such as IP data packets. The switch can be implemented as a router that includes a plurality of input ports, a plurality of output ports and a switch fabric capable of establishing logical pathways to interconnect a certain input port with a certain output port. A characterizing element of the router is its ability to control bandwidth usage on a basis of a logical pathway. This prevents congestion to occur in the switch fabric and also at the level of the output ports. For every active logical pathway the router sets-up a bandwidth control mechanism including at least one queue to hold data units received at an input port. The bandwidth control mechanism performs an accounting operation to determine the average bandwidth usage and if less than a threshold requests for releasing data units in the switch fabric are sent to the switch fabric controller.
    Type: Grant
    Filed: April 30, 1998
    Date of Patent: September 30, 2003
    Assignee: Nortel Networks Limited
    Inventors: Alan Stanley John Chapman, Hsiang-Tsung Kung
  • Patent number: 6563797
    Abstract: Surveillance of IP telephony may be performed through the use of conventional telephone equipment, according to principles of the invention while preventing giving indication to the monitored phone by alerting the user of the monitoring phone to such surveillance use prior to pick up by an agent for engagement of the monitoring phone in response to the alert. Such alerts may assume many forms such as ringing, visual indicators, data readouts, activating ancillary equipment, various flags, etc. This alert prior to surveillance is distinct from alerts used for normal non-surveillance calls, which the monitoring phone is capable of receiving.
    Type: Grant
    Filed: August 18, 1999
    Date of Patent: May 13, 2003
    Assignee: AT&T Corp.
    Inventors: Fen-Chung Kung, Jesse Eugene Russell, Anish Sankalia, Spencer C. Wang
  • Patent number: 6538987
    Abstract: A system with predefined primary and secondary routes sets up corresponding virtual circuits over both routes. A destination node maintains primary and secondary sets of routing tables that contain, respectively, routing information over each of the rings for every virtual circuit. A destination node disables the appropriate entries in the routing tables for the non-selected route, such that the node ultimately discards the traffic received over that route. To switch a virtual path, and thus all of the virtual circuits included therein, from the selected route to the nonselected route, the destination node disables and enables the appropriate entries in the primary and the secondary routing tables, to switch from using the set-up virtual circuits on the selected route to using the set-up virtual circuits on the non-selected route. To detect an event that triggers protection switching, such as path failure, the system uses “Continuity OAM cells” to provide path status information to the nodes.
    Type: Grant
    Filed: March 25, 1999
    Date of Patent: March 25, 2003
    Assignee: Ciena Corporation
    Inventors: Dan Cedrone, Walter Dray, Ed Klein, James Regan, Bappa Sinha, Ming-Teh Ma, Jeffrey Weiss
  • Patent number: 6529483
    Abstract: The invention relates to a communication system, method and processing means for switching calls in a transmission network (FN1, FN2) which is provided for switching calls from local networks (LN1, LN2). A special service provider (IN) performs special services for a subscriber placing a call in accordance with a received call line identification parameter (CLI). The special services are performed in accordance with subscriber profiles that can first be stored in a memory or updated. The operator of the transmission network (FN1, FN2) can therefore successively create a subscriber profile for each subscriber and handle him individually without being dependent on the local networks (LN1, LN2).
    Type: Grant
    Filed: May 13, 1998
    Date of Patent: March 4, 2003
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventor: Paul Gerhard Itjeshorst
  • Patent number: 6522671
    Abstract: A protocol independent multiplexer is described that allows for multiple different protocols that operate at different bit rates to be combined and output in a format that may have yet another bit rate. The multiplexer includes a series of inputting devices that are each coupled to a respective buffering device, a mapping device coupled to each of the buffering devices, and an outputting device coupled to the mapping device. Each of the inputting devices receive an input optical signal and forwards recovered data information to the corresponding buffering device. The buffering devices store the data information and output to the mapping device, the outputting being controlled by the mapping device to ensure that the buffering devices remain approximately half full. The mapping device formats the data information into individual data units and outputs the data units to the outputting device which subsequently multiplexes the data units.
    Type: Grant
    Filed: May 10, 1999
    Date of Patent: February 18, 2003
    Assignee: Nortel Networks Limited
    Inventors: Alan G. Solheim, Colin Kelly, Matthew Brown, Chris Knapton
  • Patent number: 6496483
    Abstract: Secure monitoring of a target IP telephone may be obtained simultaneously at a plurality of monitoring stations by requiring authentication to be provided by each of the monitoring stations prior to granting access permission to monitor the call. A single request generates multiple duplicate calls to a plurality of different monitoring location, each of which must be authenticated. When the monitored call arrives at each of the multiple monitoring stations a password is used to achieve authentication permission. The password is entered at each monitoring station by a touchtone keypad that generates Dual Tone Multi-frequency (DTMF) signals (e.g., each signal is a combination of two tones at different frequencies) which is sent to an IP monitoring center, which grants surveillance permission.
    Type: Grant
    Filed: August 18, 1999
    Date of Patent: December 17, 2002
    Assignee: AT&T Corp.
    Inventors: Fen-Chung Kung, Jesse Eugene Russell, Anish Sankalia, Spencer C. Wang
  • Patent number: 6493330
    Abstract: A base station transmits, in addition to a pilot channel, signals which are multiplexed with pilot symbols inserted in the respective signals in communication channels. As the transmission of the pilot channel as a reference signal for coherent detection is unnecessary with high power so as to attain high reliability, the pilot channel can be transmitted with low power by means of weight in comparison with the communication channel, so that interference with the communication channel of any other station is reduced. Moreover, accurate coherent detection can be made from the pilot symbol inserted in the communication channel on the mobile station side.
    Type: Grant
    Filed: July 12, 2000
    Date of Patent: December 10, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazuyuki Miya, Masatoshi Watanabe, Osamu Kato
  • Patent number: 6490244
    Abstract: Upper layer 3 routing in conjunction with self-healing lower layer networks is more informed by the addition of reachability costs determined in the lower layer. Maintenance changes on the self-healing network are monitored. A change causes revision of reachability costs. The revised costs are communicated by lower layer logic to upper layer logic.
    Type: Grant
    Filed: March 9, 2000
    Date of Patent: December 3, 2002
    Assignee: Nortel Networks Limited
    Inventors: Scott Pegrum, Matthew Yuen, Alicja Celer
  • Patent number: 6487187
    Abstract: In a conventional Time Division Multiple Access (TDMA) wireless system, the specified distance between a mobile unit and the base transceiver system (BTS) cannot exceed predetermined distances because of time slot synchronization constraints. Furthermore, the varying distances between mobile units and the BTS create timing differences in the random access control channel (RACCH) bursts in the initial uplink signal from the mobile stations. In this approach to extending TDMA system coverage, in-band translator components are located in the center of remote cells which would normally contain a base transceiver system. The in-band translators include a loop back circuit that permits a host BTS to measure the backhaul propagation time delay by sending test access signals between the host BTS and the distant in-band translators.
    Type: Grant
    Filed: November 24, 1998
    Date of Patent: November 26, 2002
    Assignee: Airnet Communications Corporation
    Inventors: Thomas R. Schmutz, Michael A. Komara, Roger L. Overton, Jeffrey W. Smith, David D. Coons, Jeffrey R. Nuckols
  • Patent number: 6480494
    Abstract: Methods and apparatus for communicating data between continuous bit rate trunk channels and a cell-based network are disclosed. The apparatus includes trunk interface circuitry, data interface circuitry, and cell segmentation circuitry. The trunk interface circuitry receives continuous bit rate call data that is being communicated from an originator to a recipient. The data interface circuitry is operatively coupled to the trunk interface circuitry, and is operable to receive the call data from the trunk channel and to extract an original data stream. The cell segmentation circuitry is operative to receive the original data stream from the data interface circuitry and to produce data cells. The invention also features methods of producing data cells.
    Type: Grant
    Filed: June 15, 1998
    Date of Patent: November 12, 2002
    Assignee: Nokia High Speed Access Products, Inc.
    Inventor: George T. Hawley
  • Patent number: 6480486
    Abstract: An Internet access system to be used by organizations such as hotels and the like uses local service centers adapted by first modems to in-house telephone wiring at separate premises maintained by the sponsoring organization. The modem connecting the local service center to the in-house telephone wiring is assigned a specific extension number on the in-house telephone system. The service center connects calls at the first modem to a converter that is adapted to provide Internet access through a line interface unit (LIU) to the calls answered at the first modem. A user configures a dial-up profile on his/her computer, usually a portable computer, with the extension number of the first modem, and uses this profile when resident at the hotel or other sponsoring premise. The user then is connected to the Internet at a local connection without having to have the dial-up profile and possibly script files to gain access otherwise.
    Type: Grant
    Filed: May 21, 1997
    Date of Patent: November 12, 2002
    Assignee: Lextron Systems, Inc.
    Inventor: Dan Kikinis
  • Patent number: 6480510
    Abstract: A serial intelligent cell (SIC) and a connection topology for local area networks using Electrically-conducting media. A local area network can be configured from a plurality of SIC's interconnected so that all communications between two adjacent SIC's is both point-to-point and bidirectional. Each SIC can be connected to one or more other SIC's to allow redundant communication paths. Communications in different areas of a SIC network are independent of one another, so that, unlike current bus topology and star topology, there is no fundamental limit on the size or extent of a SIC network. Each SIC can optionally be connected to one or more data terminals, computers, telephones, sensors, actuators, etc., to facilitate interconnectivity among such devices.
    Type: Grant
    Filed: July 28, 1998
    Date of Patent: November 12, 2002
    Assignee: SerCoNet Ltd.
    Inventor: Yehuda Binder
  • Patent number: 6480479
    Abstract: A base station transmits, in addition to a pilot channel, signals which are multiplexed with pilot symbols inserted in the respective signals in communication channels. As the transmission of the pilot channel as a reference signal for coherent detection is unnecessary with high power so as to attain high reliability, the pilot channel can be transmitted with low power by means of weight in comparison with the communication channel, so that interference with the communication channel of any other station is reduced. Moreover, accurate coherent detection can be made from the pilot symbol inserted in the communication channel on the mobile station side.
    Type: Grant
    Filed: October 2, 2000
    Date of Patent: November 12, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazuyuki Miya, Masatoshi Watanabe, Osamu Kato
  • Patent number: 6480491
    Abstract: A buffer receives packets of data, and places them in appropriate locations such that they are read out after varying delays. Late arriving packets are assigned a negative delay, and if too many packets are late arriving, the system begins reading out the late arriving packets from a different location in storage, rather than allowing such late arriving packets to be lost.
    Type: Grant
    Filed: November 2, 2000
    Date of Patent: November 12, 2002
    Assignee: Intel Corporation
    Inventor: Kai Miao
  • Patent number: 6480511
    Abstract: An ATM cell constructor (100) of an ATM transmitter assembles a stream of frames of constant bit-rate traffic received on a listen TDM bus (102) into cell payloads (1104) using ATM adaptation layer 1 (AAL1). Once every eight cells, the AAL1 structured data transfer (SDT) cell constructor layer (112) introduces a one-octet SDT offset pointer (1120) into the payload. This pointer designates traffic-block (TDM frame) boundaries. The payload with an attached ATM header forms an ATM cell, and the constructor transmits a stream of the ATM cells to an ATM cell deconstructor (2100) of an ATM receiver. The deconstructor disassembles the payloads of the received ATM cells and transmits the stream of frames of constant bit-rate traffic on a talk TDM bus (102). In response to each received SDT offset pointer, the deconstructor's time slot interchanger (TSI 2108) resets to the start of frame-processing, thereby aligning frames formed by the TSI with the received frames.
    Type: Grant
    Filed: September 15, 1998
    Date of Patent: November 12, 2002
    Assignee: Avaya Technology Corp.
    Inventor: Norman W. Petty
  • Patent number: 6480550
    Abstract: Described is a method of compressing an analogue signal, e.g. a voice signal, the signal function being continuously sampled, quantized and encoded into data words, the difference between each two successive data words determined and each difference value quantized and encoded.
    Type: Grant
    Filed: November 3, 1998
    Date of Patent: November 12, 2002
    Assignee: Ericsson Austria AG
    Inventor: Gerhard Zimmermann
  • Patent number: 6477175
    Abstract: Method and apparatus for supplying the receivers with information in successive steps. The source supplies the first receiver with the information in a first step and supplies a second receiver in a second step whilst the first receiver simultaneously supplies the information to a third receiver. In further steps the source and already supplied receivers each supply a further receiver with the information until all receivers to be supplied have received the information. ADVANTAGE—Enables transfer of large quantities of program code and data from central station to several interconnected decentral stations, in very short time and with optimal use of transmission capacity.
    Type: Grant
    Filed: September 15, 1998
    Date of Patent: November 5, 2002
    Assignee: Siemens Schweiz
    Inventors: Thomas Abeln, Matthias Keller, Peter Lietha, Stefan Schwarz, Peter Giese
  • Patent number: 6470032
    Abstract: A system and method for synchronizing clocks related to telecommunications throughout s point-to-multipoint optical network utilizes downstream data timed using a high frequency transmission clock to distribute timing information of a central telecom-based clock to remote terminals. In an exemplary embodiment, the point-to-multipoint optical network system is an Ethernet-based passive optical network (PON) system that operates in accordance with a Gigabit Ethernet standard. The timing information of the central telecom-based clock is extracted from the downstream data at each remote terminal by recovering the high frequency transmission clock and then, deriving a reference clock, which is synchronized with the central telecom-based clock, from the recovered transmission clock. The reference clock is then used to generate one or more telecom-related clocks that are needed by the remote terminal.
    Type: Grant
    Filed: March 20, 2001
    Date of Patent: October 22, 2002
    Assignee: Alloptic, Inc.
    Inventors: Thaddeus J. Dudziak, Dumitru Gruia, Joseph G. DeCarolis