Patents Examined by H. Kizou
  • Patent number: 5185743
    Abstract: An index value output circuit outputs an index value in response to a VCI added to the first signaling cell outputted from a terminal unit. A switching data output circuit outputs switching data for determining a path for signaling cells, based on the index value. Hence, by revising the index value according to a congestion state of an ATM switch, the above path is dynamically changed. The same index value is inserted in the second and subsequent signaling cells outputted from the terminal unit. Because switching data are based on the same index value, all signaling cells from the same terminal units are fed to the same signaling terminator.
    Type: Grant
    Filed: February 7, 1991
    Date of Patent: February 9, 1993
    Assignee: Fujitsu Limited
    Inventors: Masami Murayama, Atsuhisa Takahashi, Satoshi Kakuma, Shuji Yoshimura
  • Patent number: 5185742
    Abstract: A remote telecommunication terminal providing telecommunication functions identical to those functions provided by local telecommunication terminal directly connected to a telecommunications system via a direct standard link using a standard protocol. The remote telecommunication terminal is interconnected to the telecommunication system through an intervening switching system such as the public telephone network. One such remote telecommunication terminal is a remote telemarketing terminal. A remote telemarketing terminal cooperates with the telemarketing system to establish a virtual interface on the telemarketing system. The telemarketing system views this virtual interface as being identical to a physical interface such as one connected to a local telemarketing terminal via a standard link. The remote telemarketing terminal then establishes a virtual link between itself and the virtual interface on the telemarketing system.
    Type: Grant
    Filed: December 31, 1990
    Date of Patent: February 9, 1993
    Assignee: AT&T Bell Laboratories
    Inventors: Bruce M. Bales, Robert L. Crumpley, Sandra S. North, Stephen M. Thieler
  • Patent number: 5182750
    Abstract: A switching architecture interconnecting remote switches to a central processor via standard links which may be set up through any number of intervening switching systems utilizing standard switching procedures. The standard links are ISDN links that may be set up dynamically via switching networks within the switching system or via the public switching network. The fact that an ISDN goes through a portion of the switching system or the public switching network is transparent to both the central processor and remote switch. Upon detecting that a primary central processor is no longer in control, each remote switch attempts to obtain an alternate path to the primary central processor. If a remote switch is unable to obtain an alternate path to the primary central processor, the remote switch switches to an alternate central processor on the assumption that the primary central processor has failed.
    Type: Grant
    Filed: December 31, 1990
    Date of Patent: January 26, 1993
    Assignee: AT&T Bell Laboratories
    Inventors: Bruce M. Bales, Robert L. Crumpley, Sandra S. North, Stephen M. Thieler
  • Patent number: 5181198
    Abstract: A communication system for coordinated transmission of signals from two data sources over a pair of transmission lines includes a central office transceiver and a remote transceiver terminating the corresponding ends of the pair of transmission lines. Each transceiver includes a transmitter with a complementary receiver. The signal amplitudes propagated on the lines are related to each other according to a prescribed relation that effects enhanced signal-to-noise ratio. The transmitter includes a set of amplification factors determined by the prescribed relation; similarly, the receiver also includes two sets of amplication factors to perform the dual to the transmitter operation. The transmitter incorporates a two-dimensional generalization to a conventional echo canceler, namely, an implementation to cancel both echo and near-end crosstalk interfering components.
    Type: Grant
    Filed: March 12, 1991
    Date of Patent: January 19, 1993
    Assignee: Bell Communications Research, Inc.
    Inventor: Joseph W. Lechleider
  • Patent number: 5175734
    Abstract: Clock supply for multiplex systems for distributing at least one system clock signal and at least one frame clock signal, whereby a marking circuit is provided to which both clock signals are provided and that generates a combined system-frame clock signal by marking the system clock signal. This combined system-frame clock signal is transmitted on a single clock line and being separated in turn into the system clock signal and the frame clock signal by a separating circuit.
    Type: Grant
    Filed: April 22, 1992
    Date of Patent: December 29, 1992
    Assignee: Siemens Aktiengesellschaft
    Inventor: Imre Sarkoezi
  • Patent number: 5175727
    Abstract: The present invention discloses a communication system network that comprises a plurality of communication systems and a processing multiplexer. The communication systems, which may be either conventional communication systems and/or trunked communication systems, transmit digitized audio signals and communication system data to the processing multiplexer. Based on signal destination data, which is part of the communication system data, the processing multiplexer processes the digitized signals and routes the resultant signals to the appropriate signal destinations of the communication systems.
    Type: Grant
    Filed: April 16, 1990
    Date of Patent: December 29, 1992
    Inventors: John W. Maher, James H. Errico, James A. Henderson, Jr., Theodore M. Bloomstein
  • Patent number: 5170392
    Abstract: A receiver 200 automatically compensates for intermodulation of an input signal. The receiver 200 is preceded by a receiver front-end 105 which is coupled to antennas 100-102 receiving the signal. The gain of the antenna path/frequency is calibrated and stored for all combinations of antenna path/frequency. When a signal is received, the receiver 200 determines the correct stored gain factor representing the antenna receiving the signal and the frequency of the signal. The gain factor is compared against a predetermined threshold, and if the gain factor is greater than the threshold, an attenuator 400 placed at the front of the receiver 200 is inserted to optimize signal intermodulation. If the gain factor less than the threshold, the attenuator 400 is bypassed to optimize the sensitivity of the receiver 200.
    Type: Grant
    Filed: January 16, 1991
    Date of Patent: December 8, 1992
    Assignee: Motorola, Inc.
    Inventor: Kenneth B. Riordan
  • Patent number: 5170394
    Abstract: A packet switched network has a system for providing an end-to-end connection for a communication or data transfer session between a host processor and a transparent connection device, which may be an unattended device, both utilizing a 3270 protocol. A terminal PAD is responsive to positive dataset signals on the associated line for the device indicating desire to establish communication by the device, irrespective of the absence of polling of the device by the host or by the terminal PAD, to transmit a call request packet through the network to a host PAD operatively associated with the host. The host PAD is responsive to the call request subsequent to a poll from the host to transmit call accept and circuit enable packets through the network to the terminal PAD. The latter then commences polling of the device to evoke information and data messages from the device for end-to-end communication with the host in the data transfer state.
    Type: Grant
    Filed: December 19, 1990
    Date of Patent: December 8, 1992
    Assignee: Sprint International Communications Corp.
    Inventors: Jeffrey A. Biber, Zon-Hong Hsieh
  • Patent number: 5168497
    Abstract: A packet communication processing method in a communication apparatus which performs communication with end apparatus for performing data link layer processing according to a data link protocol such as HDLC or similar protocol, in which method information frames (I frames) are received regardless of the rightness of a sending sequence number N(S) which is included in a control field (C field) in each of the received information so as to indicate the sequence of the I frames.
    Type: Grant
    Filed: September 19, 1989
    Date of Patent: December 1, 1992
    Assignee: Hitachi, Ltd.
    Inventors: Seiichi Ozaki, Michio Asano, Yoshihiro Takiyasu
  • Patent number: 5166923
    Abstract: A loopback test starting system is provided for starting a loopback test. The loopback test starting system includes a first loopback controller which detects a first loopback control signal from a digital data services network side and generates a first loopback starting signal. In addition, a second loopback controller is provided which detects a second loopback control signal from a subscriber side and generates a second loopback starting signal in response. The loopback test starting system also includes a first loopback forming device which forms a first loop from the digital data services network side through the subscriber side and back to the digital data services network side, and a second loopback forming device which forms a second loop from the subscriber's side through the digital data services side and back to the subscriber side.
    Type: Grant
    Filed: August 29, 1990
    Date of Patent: November 24, 1992
    Assignee: Fujitsu Limited
    Inventors: Hisakazu Ohmori, Yoshinori Ishii
  • Patent number: 5157658
    Abstract: In order to identify a newly installed modem joining other modems which are already installed and established communications with a control unti, the newly installed modem generates, upon installation, a first logic state on an install detecting line which normally exhibits a second logic state. In response to the first logic state on the install detecting line, the control unit issues addresses which cover a predetermined maximum number of modems which can be managed by the control unit. The newly installed modem generates a reply signal in response to an address assigned thereto. The reply signal is sent to the control unit, and hence the control signal identifies the newly installed modem and is ready for establishing communication therewith.
    Type: Grant
    Filed: December 26, 1990
    Date of Patent: October 20, 1992
    Assignee: NEC Corporation
    Inventors: Kazushige Arai, Tatsuya Sakamoto
  • Patent number: 5157656
    Abstract: A data transmission method and apparatus provides for transmitting lower data rate information in a higher data transmission rate environment. Information entities to be transmitted are broken into smaller entitles called nyblets. Higher data transmission rates are accomodated by accelerating a clock and clocking nyblets from memory at rate that allows the nyblets to be serially assembled into expected bit length words. Lower data rate information, which in conventional systems was transmitted redundantly to achieve compatibility with higher data rate systems, is now transmitted without duplication as a plurality of nyblets in series until the expected bit length is achieved. The result is that more information can be transmitted over a communication medium, since duplicate or redundant transmission of lower data rate information is avoided.
    Type: Grant
    Filed: July 31, 1990
    Date of Patent: October 20, 1992
    Assignee: Northern Telecom Limited
    Inventors: Andy Turudic, Mark G. Schnell
  • Patent number: 5155727
    Abstract: A method for controlling the access of a data transmitter unit to a signal line, enabling approximately full utilization of the bandwidth of the signal line for data transfer, avoidance of collisions, conveyance of the transmitted data amount independently of the signal line length, and ensuring access to the signal line when the unit is to transmit. An apparatus for performing the method, comprising an input (1) and an output (2), a delay unit (3), a data transmitter unit (4) and an activation circuit (5).
    Type: Grant
    Filed: December 18, 1989
    Date of Patent: October 13, 1992
    Assignee: Bolt, Beranek and Newman, Inc.
    Inventors: Gottlob Borup, Flemming H. Pedersen
  • Patent number: 5151898
    Abstract: A ring-shaped data communications network in which plural slave stations and a master station are serially connected in a closed loop via transmission lines, the slave stations being removably connected to the loop without affecting the continuity of data transmission on the loop. A connection box, permanently connected into the loop and adapted to receive the removable slave station, has circuitry for switching the data loop paths through the slave station. Switching of the data loop occurs when the slave station has been physically connected to the connection box and when a non-communicating portion of the data stream in the loop has been received at the connection box. Apparatus for detecting the connection of the slave station to the box and for detecting the absence of information in the data stream controls operation of the switching.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: September 29, 1992
    Assignee: Mitsubishi Denki K.K.
    Inventor: Haruhiko Kondo
  • Patent number: 5146457
    Abstract: A system for transmitting digitized analog information includes, for the purpose of transmitting an additional information signal apparatus for modifying the bit of low significance of every n-th data word representing the digitized information depending on the bits of an additional information signal. The apparatus for modifying is constructed in such a way that the modification depends both on the additional information signal and on other bits such as the most significant bit b7 of the data word which are not correlated with the bits of the additional information signal. This results in the intercorrelation between the errors in the data words introduced by the modification being reduced, so that a flatter power density error spectrum is obtained and the errors introduced in the data words by the modification are less conspicuous. A system for recovering the additional information signal from received modified data words includes similar apparatus for reversing the modification.
    Type: Grant
    Filed: November 14, 1991
    Date of Patent: September 8, 1992
    Assignee: U.S. Philips Corporation
    Inventors: Raymond N. J. Veldhuis, Gerrit J. Keesman
  • Patent number: 5144624
    Abstract: In a telecommunication system, a circuit is provided for determining the system mode and for restoring converted signalling bits. The circuit is designed to be used in a telecommunication system that lacks frame alignment. The circuit may serve as an trunk line interface located in a Direct Digital Access Office Channel Unit. Alternatively, the circuit may be coupled to a single trunk line which links Customer Premises Equipment (CPE) to the telecommunication system. The detection portion of the circuit determines the system mode of the trunk line connected to a CPE by detecting signalling bits when frame alignment is not maintained. The restoration portion of the circuit restores signalling bits which were converted due to a lack of frame alignment to their pre-converted state.
    Type: Grant
    Filed: November 19, 1990
    Date of Patent: September 1, 1992
    Assignee: Integrated Network Corporation
    Inventors: Craig A. Sharper, Lynne A. Reamer
  • Patent number: 5144625
    Abstract: A method and system for interfacing a transmission facility with a digital subscriber line to enable transmission of digital voice communication and associated digital signalling are provided. A digital signal from the digital subscriber line is demultiplexed into a digital communication signal and a digital input control signal having a first sequence providing standard framing pattern, a second sequence providing signalling identification, and a third sequence providing signalling information. A monitor monitors the sequence of the input control signal and produces a signalling identification detect signal when the second sequence is detected and signalling enablement output when the third sequence is detected. The communication signal from the digital subscriber line is selectively multiplexed with the signalling information from the input control signal. The signalling information is output to the transmission facility when the signalling-enablement output is produced by the monitor.
    Type: Grant
    Filed: December 27, 1990
    Date of Patent: September 1, 1992
    Assignee: Adtran
    Inventors: Roger W. Cain, Dennis B. McMahan
  • Patent number: 5144619
    Abstract: In order to handle asynchronous transfer mode (ATM) cells and synchronous transfer mode (STM) words in a single switch, STM words incoming on a channel are accumulated until a desired data block is available and a switch header is then added thereto in order to form an STM switch cell. The header includes routing information and a flag indicating the switch cell comprises STM words. In addition, a switch header is added to each ATM cell incoming on a channel in order to form an ATM switch cell. The header added to ATM cells includes routing information and a flag indicating the cell comprises an ATM cell. The ATM and STM switch cells feed input channels of a common memory switch. An ATM switch cell from a given incoming channel is stored at a memory address and the memory address input to a queue which is assigned to the outgoing channel indicated by the routing information of the switch header of the cell.
    Type: Grant
    Filed: January 11, 1991
    Date of Patent: September 1, 1992
    Assignee: Northern Telecom Limited
    Inventor: Ernst A. Munter
  • Patent number: 5142527
    Abstract: The equipment includes a recorder (17) provided with at least one memory disk unit (32) for recording messages and for deferred retransmission thereof. The equipment includes circuitry (18, 22) for putting a plurality of telephone sets into communication simultaneously with a single disk controller (33) of the recorder for transmitting messages simultaneously both from the telephone sets and from the disk unit. The invention is particularly suitable for private branch exchanges.
    Type: Grant
    Filed: June 20, 1990
    Date of Patent: August 25, 1992
    Assignee: Alcatel Business Systems
    Inventors: Nathalie Barbier, Roger Cartret, Jean-Claude Hoyami, Gerald Le Cucq
  • Patent number: 5140588
    Abstract: A circuit arrangement for call-associated identification of transmitted message signals in an ATM switching system wherein each of the incoming trunks has a plurality of counters which correspond in number to the plurality of virtual connections. When a message appears, the message cells drive the counters for a call-associated acquisition of the message cells based on the description of the cell header contained therein that identified the particular virtual connection.
    Type: Grant
    Filed: September 25, 1990
    Date of Patent: August 18, 1992
    Assignee: Siemens Aktiengesellschaft
    Inventor: Gerd Danner