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5410536 |
Method of error recovery in a data communication system
Described is a method of error recovery in a data communication system of the kind comprising two nodes connected by a serial link and wherein data is transmitted between the nodes in the form of...
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5408348 |
System for re-establishing the transmission quality of a link including amplifier equipments in the event of failure of one or more amplifier equipments
A system for re-establishing the transmission quality of a digital information transmission link including amplifier equipments in the event of failure of one or more amplifier equipments includes,...
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5404498 |
Voltage setting apparatus in a multiplex transmission system
Multiplex nodes (11, 12) connected via multiplex transmission lines (A, B and C), a voltage setting unit 16, which changes the voltage of the multiplex transmission line C to a specified value, a...
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5384765 |
Automobile multiplex data communication system including fail-safe function for LAN communication network
In an automobile multiplex data communication system (1000), a fail-safe function is established without providing a specific function switch. The automobile multiplex data communication system...
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5379292 |
Apparatus having priority order storages for recovery from failure of multiplex data transmission
In a multiplex transmission apparatus, multiplex transmission paths to each of which a plurality of communication nodes are connected through a gateway node. When data transfer between the...
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5371731 |
Network traffic management
A network traffic management system and method for a relay-based communications network such as Frame Mode Bearer Service (FMBS) in which terminals (A and B) are linked by nodes (N) through which...
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5369759 |
Call information based matching system for stored program-controlled switching system
An apparatus and method for matching information between a first and a second processor to preserve a call includes determination units each provided in the respective processor. When a...
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5321812 |
Loop detection and dissolution in a focal point network
In a focal point network, adjacent nodes may agree to a relationship where one node (a focal point or server node) supplies network management services to the other node (a non-focal point or...
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5301185 |
Ring communication system
A communication system in which a plurality of nodes or terminal access units 2 are connected via a media ring 3. Data is transmitted in a series of data packets within which the bits or bytes are...
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5301207 |
Test apparatus and process for digital data service system
Loop circuits lacking byte alignment are tested by test equipment signals at 9.6 kbps transmitted over a DSφ format 19.2 kbps communication network. Upon indication of loss of 19.2 kbps framing,...
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5299188 |
Earth station capable of carrying out communication without a control station
In a earth station having a particular address and comprising a terminal and a transmitting section for transmitting a transmission data signal including an address signal representative of the...
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5285448 |
Transmission system of system of system control information in a ring LAN system
In a system control information transmission system in a ring LAN system, each of a plurality of data transmission devices transmits a transmission frame including a user information transmission...
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5272699 |
Method of multiplex transmission
A method of multiplex transmission for effecting multiplex transmission among a plurality of multiplex nodes is disclosed. The multiplex nodes are connected to a transmission path in which each...
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5267231 |
Digital communication channel interface
A differential protective relay system includes protective relays 19A and 19B at the terminals of a protected transmission line segment 21. Analog signals QL1 and QL2 are sampled at the respective...
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5265096 |
Sonet alarm indication signal transmission method and apparatus
Methods and apparatus for quickly generating and transmitting SONET AIS signals are disclosed. Upon detecting a failure condition at the receiving side of a SONET terminating equipment, the SONET...
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5260933 |
Acknowledgement protocol for serial data network with out-of-order delivery
A system and method for controlling the transmission of frames or packets of data in a serial network which allows out-of-order delivery. The data frames transmitted by the initiator node to the...
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5216704 |
Method for remote power fail detection and maintaining continuous operation for data and voice devices operating over local loops
First and second ISDN modems are disposed at a subscriber location and telephone system central office and are arranged to operate in a normal mode, and in a bypass mode upon power failure at the...
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5210746 |
Communication system network having communication system fallback operation
In a communication system network that comprises a plurality of communication systems and a processing multiplexer, each of the plurality of communication systems is equipped with fallback...
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5166975 |
Communication terminal equipment
A communication terminal equipment that permits two-way communications to be performed over a complex communications network having an integrated services digital network interconnected with...
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5165091 |
Firmware download from a remote terminal to an optical network terminal in a digital loop carrier system
A multiplexing communications system comprising a first terminal means for transmitting and receiving user digitized data, a second terminal means for transmitting and receiving the user digitized...
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5146585 |
Synchronized fault tolerant clocks for multiprocessor systems
A system for providing fault-tolerant synchronized operation of the Time of Day (TOD) clocks of the respective data processors in a multiprocessor complex. Basically, the system is comprised of a...
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5140586 |
Token associated data network communications protocol
A multinodal bus network protocol used in communication systems employing tokens to indicate the next interface unit to transmit, with cojoining of token addressing and data in one trasmission,...
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5134704 |
Fault tolerant, collateral message and recovery system within a telephone distributed processing system having message switching modules for transmission link
System for collateral out-of-band messaging within the distributed data processing environment in a digital switch which has mainstream in-band data channels. The system comprises independent reset...
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5105420 |
Method and apparatus for reconfiguring interconnections between switching system functional units
An illustrative method and structural arrangement for reconfiguration of switching system functional units where although the distributed control entities and the distributed switch units of a...
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5063563 |
Communication terminal having means for controlling power transfer
A communication terminal is coupled to a communication network via transmitting and receiving signal lines and a switching system. The communication terminal includes a power input line coupled to...
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5031175 |
Communication control method for releasing communication apparatus from occupied state
A communication control method for use in a communication system including a plurality of communication control apparatuses interconnected through an information transmission path, each of the...
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5029159 |
Method and means for leader choosing on a token ring system
In a token ring transmission system, token loss causes selection of a leader terminal, which issues a new token. The leader terminal is chosen by selecting and storing a leadership selection...
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4970714 |
Adaptive data link protocol
A communication system provides high speed transmission of data over a link, such as a fiber optic link, between a first terminal and a second terminal. The architecture and protocol permits the...
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4947385 |
Monitoring system for a local bus network in a star structure
A local bus network is constructed in a star configuration and comprises transmission direction-associated star lines, the transmission channels leading from the peripheral stations to the central...
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4887076 |
Computer interconnect coupler for clusters of data processing devices
A computer interconnect coupler has channel transmitters and channel receivers and logic circuitry for the routing of messages from the channel receivers which are addressed to the channel...
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4873687 |
Failing resource manager in a multiplex communication system
A method and apparatus for detecting and analyzing errors in a communications system is described. The method employs expert system techniques to isolate failures to specific field replaceable...
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4858222 |
Circuit arrangement for serial data transmission
A circuit arrangement, for serial data transmission via at least one bus, is made up of plural subscriber stations each having a time circuit, by means of which faulty seizure of the bus can be...
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4849971 |
Carrier telephone service analysis system
A call completion analysis system may be coupled to monitor any of many different kinds of telephone transmission equipment which may use any of a great variety of different kinds of signaling...
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4841520 |
Data transmission system with bus failure detection system
A multiplex system includes a bus, a central controller coupled to the bus, and a number of remote stations coupled to the bus. The central controller applies clock signals to the bus, receives...
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4831518 |
Multiprocessor interrupt rerouting mechanism
A multiprocessor interrupt rerouting mechanism and method is disclosed for rerouting messages intended for a first processor to a second processor. In a fault tolerant computer system having...
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4825206 |
Automatic feedback of network topology data
An automatic feedback mechanism in a communications network having dynamic routing. The invention detects the failure of an element in a route that is either in the process of being created or has...
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4821256 |
Method for monitoring information transmission in connected through four-wire connecting paths, more particularly semipermanently connected through connecting paths in digital time multiplex exchanges
The switching network is tested by comparison of bit streams coming from the double part switching network parts; other parts of the exchange are tested by parity checking. Evaluation takes place...
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4787082 |
Data flow control arrangement for local area network
In a local data distribution network configuration a plurality of bidirectional data distribution busses are each connected to a bus master control circuit at a terminal end of the bus. Connected...
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4759015 |
Ring network system for transmission of multicast information
In a network system wherein a plurality of terminal devices communicates with each other via respective node devices over a ring transmission line, a transmitting node device can confirm whether a...
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4750175 |
Network diagnostic apparatus and method
A system for testing a data processing network and diagnosing malfunctions therein is disclosed. It is assumed that the data processing network includes a plurality of processing units coupled by...
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4740958 |
Data transmission system
A data transmission system is described, comprising a plurality of processing nodes (10-13). At any given time, one of the nodes acts as a star coupler, for broadcasting messages to all the other...
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4701756 |
Fault-tolerant hierarchical network
Hierarchical star or rooted tree networks have been implemented and have any desirable characteristics, including excellent performance, conceptual simplicity, and suitability for optical fiber...
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4688216 |
Station relief arrangement for use in relieving operation of a reference station in a TDMA network without reduction of frame availability
In a TDMA satellite communication network comprising a plurality of earth stations, a predetermined one of the stations is operable as a primary reference station for producing a first and a second...
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4656634 |
Skew insensitive fault detect and signal routing device
This invention relates to a fault detect and signal routing device that may be used to monitor and control redundant signals. The invention includes an input/output unit (11) for receiving the...
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4651317 |
Time division multiplex data transmission system
A time division multiplex data transmission system. A particular time slot among those for data transmission is placed with alternation of different data modes such as "1" and "0" in a commanding...
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4651298 |
Selection of data from busses for test
A test computer has a direct memory access module, interface units, and a data select unit for each of several system busses. Only some of the data on each system buss is to be transferred to the...
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4649384 |
Method and apparatus for fault tolerant serial communication of digital information
A method and apparatus for serial communication of digital information in an information processing system for high throughput fault tolerant communication is disclosed. High throughput is achieved...
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4641372 |
Power feeding submarine telecommunications systems
An optical undersea telecommunications system has a main cable (1) which branches (BU1) near a landfall to two separate stations. Each branch (71,81) supplies half the current of the main cable (1)...
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4637011 |
Fault tolerant dual port serial link controller
A multiple port serial link controller printed wiring card is shown. This printed wiring card provides at least two independent ports. These ports may be of different types such as RS-232...
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4630259 |
Lockup detection and recovery in a packet switching network
A self-routing packet switching network in which packets are communicated through stages of the network in response to self-contained addresses and in which a packet is discarded if a packet cannot...
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