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5953347 |
Integrated management of multiple networks with different topologies
An integrated network management system for multiple networks of different topology domains employs hierarchical pass-through routing and multi-network service management through the network.
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5948108 |
Method and system for providing fault tolerant access between clients and a server
A method and system for providing a fault tolerant access between network clients and a network server. Accordingly, a preferred embodiment of the present invention, a first primary input/output...
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5949753 |
Redundant internet protocol gateways using local area network emulation
An ELAN having redundant default gateways is attached to an asynchronous transfer mode (ATM) communications network. The ELAN's redundant default gateways are comprised of a first and second...
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5944798 |
System and method for arbitrated loop recovery
A computer system with a plurality of devices compatible with the Fibre Channel Protocol. The computer system is provided with the capability to recover from a loop hang condition resulting from an...
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5943315 |
Multiplex transmission system and abnormality processing controlling method and apparatus used therefor
A multiplex transmission system includes a multiplex transmission network through which normality and abnormality processing control specification information (PCSI) for loads are transmitted. A...
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5940366 |
Multiplex transmission method
Basic nodes each having a communication control circuit and a CPU and I/O nodes each having a communication control circuit are interconnected via a bus. Each of the communication control circuits...
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5940769 |
Radio communication system having re-send control method
In a radio communication system, communication for sending data from a transmitting station to a receiving station and communication for transmitting re-send data from the transmitting station to...
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5936936 |
Redundancy mechanisms for classical internet protocol over asynchronous transfer mode networks
A primary ARP server and a backup ARP server are connected to an ATM communications network. The primary and backup ARP servers each have associated ATM addresses. Also, a LIS is connected to the...
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5936937 |
Mobile communication system using CDMA site diversity system
A mobile communication system comprises a mobile station for transmitting packet data. A number of base stations receive the packet data and produce received packet data, respectively. A mobile...
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5935267 |
Data communication method and a data communication system for use with a digital network
Transmission and reception nodes are connected to a communication network to be controlled with respect to time according to bus time as time information shared therebetween. The transmission node...
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5930232 |
Method and system for implementing a protection switching protocol
Method and system for implementing a protection switching protocol of a telecommunications network (14). The method and system employs a protection object (80) including a set of attributes (84)...
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5903543 |
Apparatus and method of preventing cell data loss during clock switching
In a clock system having active and standby clocks for synchronizing cell data flow in a data system, and for preventing cell data loss during active to standby clock switching, a prevent circuit...
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5898914 |
Method of generating a ringing signal in a satellite communications system
A ringing signal is generated at one of a plurality of terminal stations in a SCPC-DAMA (single channel per carrier demand assigned multiple access) satellite communications system. The satellite...
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5896402 |
Retransmission control method
A highly efficient retransmission control method is achieved by preventing the order of data from being changed by one revolution of a modulo without adding extra overhead. The transmitting side...
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5896413 |
Apparatus for and method of transmitting data
A contention control system unitarily manages a plurality of data transmissions so as to avoid contention therebetween. Data transmission command sending equipment of a data receiver continuously...
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5896474 |
Optical network having protection configuration
A passive optical-connection network having a protection configuration consists of at least two subnetworks (1, 2), each comprising an access node (1.1, 2.1), a feed network (1.2, 2.2), and a...
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5883939 |
Distributed architecture for an intelligent networking coprocessor
Group communication technology, such as the Horus process, is used to implement a fault-tolerant high performance, reactive, real-time distributed IN coprocessor. The architecture of the...
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5870032 |
Restoration network architecture
A network (100) capable of quickly restoring traffic includes main and tertiary communications media (103, 105), each having associated main channels (102 1 -- 102 n ) and tertiary channels (104 1 ...
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5859959 |
Computer network with devices/paths having redundant links
A dual-connection option allows preservation of network connectivity to a device or path by providing a second, redundant connection which takes over if a first connection fails. One goal is to...
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5844885 |
Method and apparatus of providing bit count integrity and synchronous data transfer over a channel which does not preserve synchronization
Synchronization and bit count integrity of a synchronous data stream is preserved end to end even as it is transmitted via a medium which does not preserve the synchronous nature of the synchronous...
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5838660 |
Dynamic restoration process
A method and apparatus is provided for dynamically generating routes within a diverse interconnected network which may be in a state of flux. This routing process will utilize node source/target...
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5835481 |
Fault tolerant lane system
A system and method are disclosed for providing a redundancy scheme in an ATM network providing a LAN emulation. The ATM network includes a set of LAN Emulation Connection Servers (LECS's) which...
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5802039 |
Mobile radio communication apparatus with synchronized reception recovering function
Disclosed is a mobile radio communication apparatus having a sync restoring control function equipped in a controller. When disconnection of reception is detected during communication, the sync...
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5796717 |
System for switching from working units to stand-by units
A switching system for switching from a unit or units in a working state to a unit or units in a stand-by state in which the units in a stand-by state are provided as either individual stand-by...
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5777983 |
Asynchronous multiport controlling technique for a single system of a remote security administration system
An asynchronous multiport controlling technique in a single processor of a remote security administration system, for example, including a scanning unit, a VAN (value added network) main unit, an...
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5774817 |
Communication circuit for local area network
A circuit arrangement disposed in a node within a local area network is connected to a communication bus within the local area network. The circuit arrangement includes an input circuit for...
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5768250 |
Error recovery in a network having cascaded hubs
A network system includes end nodes which are connected to a plurality of cascaded hubs. Each hub is able to generate a network error packet when a timeout is detected. More specifically, a first...
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5768493 |
Algorithm for fault tolerant routing in benes networks
Benes networks are used in SIMD single instruction multiple data parallel processing systems to provide interprocessor communication. The invention describes an algorithm which will allow these...
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5734687 |
Hierarchical synchronization method and a telecommunications system employing message-based synchronization
A hierarchical synchronization method for a telecommunications system employing message-based synchronization and a telecommunications system employing message-based synchronization and including a...
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5734695 |
Telecommunication exchange comprising a processor system, and a processor system
A telecommunication exchange is described for switching through telecommunication links, which is controlled by a processor system. The processor system comprises a plurality of parallel-arranged...
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5719883 |
Adaptive ARQ/FEC technique for multitone transmission
Increased numbers of multipath transmission errors, that are detected by the performance of cyclic redundancy checking (CRC) over time and frequency on the words of a multitone transmission block...
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5712968 |
System for establishing new path in ring network and dividing ring shaped path into plurality of ring shaped paths by being rid of faulty path
A conference system is formed by multiple workstations which have individual conference control programs and are connected to a network, with each workstation having a destination workstation...
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5710756 |
Burst-error resistant ATM microwave link and network
A digital radio link suitable for transmitting digital voice or data signals includes an input circuit for ATM or frame relay cells/frames attached to an ATM or Frame Relay network, a forward error...
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5705998 |
Method for routing telecommunication calls in a network
Telecommunication connections that are to be set up are provided with a signaling information (SI) that has an originating information (UI) for identifying the originating node, a destination...
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5706276 |
System for restoration of communications networks
Difficulties with prior disrupted communications restoration systems are overcome by employing for each node of a communications network a restoration processor in which predetermined functions of...
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5684788 |
Method of providing a frame clock for data signals in a communications network and switching device of the network
The method of providing a frame clock for data signals in a communications network includes determining phase positions (P1, P2, . . . ) of respective frame clock information (RT1, RT2, . . . ) of...
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5680546 |
Passive optical network structure with high fault tolerance
Fault tolerant topology for passive optical networks essentially based on a "tree configuration" with branch points or nodes (16, 17) made up of passive optical splitters, in which each node (16,...
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5668796 |
Duplexing and switching system and method in a multiplexed system
In a switching system and method in a multiplexed system, the multiplexed system is kept in continuous normal operation by duplexing of functions and by switching to a non-failure side when the...
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5664104 |
Transfer processor including a plurality of failure display units wherein a transfer process is prohibited if failure is indicated in a failure display unit
A data processing unit is adapted to exchange data with another data processing unit via a network. The data processing unit includes a main storage for storing programs and data, an instruction...
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5661719 |
Method for activating a backup network management station in a network management system
A network management system includes at least two network management stations. One of the stations is set as a main network management station, and the other is set as a backup network management...
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5650998 |
Method for reassigning traffic in a common channel signalling system (SS7)
A method for balancing traffic among parallel links connecting two signalling points of a Common Channel Signalling System (SS7) when one or more of the links becomes unavailable. A change-over...
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5647035 |
Ring network communication structure on an optical carrier and reconfigurable node for said structure
In a ring network communication structure for communication on an optical carrier (3A, 3B), a plurality of nodes (2A, . . . , 2E) are interconnected by means of connections comprising at least a...
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5619252 |
Video telephone system and method for transmitting and receiving signals when there is a failure in the system
A video telephone system which automatically switches during a normally operating communicating function to a minimum voice signal and a sub-power source when a master power source fails, and...
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5612946 |
Electrical device with input and output ports for changing the multiplex number of transmittal buses and system using the electrical device
The same electrical device can be used in two modes, a simplex bus connection mode and a duplex bus connection mode, by collating signals output from two input and output ports for two electrical...
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5581549 |
Processor resetting method and apparatus
In a communication network including a plurality of nodes, when it is desired for a processor A of one of the nodes to reset another processor B within the same node or within another of the nodes,...
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5570343 |
Communications system
In order to mitigate problems caused by total or partial failure of a number of sectorised radio channel unit transceivers (RCU) in a base station of a particular cell (16) of a radio...
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5548579 |
System for effective allocation of network-wide bandwidth
To address Quality of Service (QoS) requirements in a domain of Local Area Networks(LANs) interconnected by at least one FDDI segment, network-wide bandwidth allocation is improved by a high...
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5515429 |
Backup apparatus against line defect and backup method against line defect
A backup apparatus in a communication system, functioning such that when an analog dedicated line is working properly, controllers on a host unit side and a terminal unit side control respective...
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5515418 |
Automatic circuit back-up system
An automatic circuit back-up system is adapted to a data communication system including a private communication line for data communication and a back-up communication circuit for providing a...
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5502712 |
Routing system in data communication with frame relay procedure control
In a routing system used in each of exchange stations of a data communication network and including trunk terminator groups physically terminating transit trunks to receive incoming signals and...
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