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5734641 |
Device and method for discriminating timeout
A device for discriminating timeout comprises an event discrimination unit, a calculation unit, a timing storage unit and a timeout discrimination unit. The event discrimination unit outputs each...
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5726638 |
Method and device for serial communication
An asynchronous serial communication device in which data transmitted at different speeds coexist and are exchanged. Time losses when errors are generated are effectively eliminated when...
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5724342 |
Method for receiving a signal in a synchronous digital telecommunications system
A method for receiving a signal used in a synchronous digital telecommunications system, such as the SDH or SONET system, in which pointer interpretation is performed where a receiver has three...
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5724343 |
Device for communications between a plurality of functional modules installed in a local unit and an ARINC 629 type external bus
In order to have the functional modules of a local unit communicate with one another and with an external bus, the device embodying the invention comprises: at least one internal bus of the same...
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5724166 |
Information sharing method for a plurality of nodes in communication system and communication system
In a communication system, communication is performed by connecting a plurality of nodes via a signal line. In the system, the same information is shared in the plurality of nodes in accordance...
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5715238 |
Apparatus and method for detecting a loss of a telecommunications channel connection
An apparatus and method are provided for a data communications device (100), such as a modem, to detect the loss of a telecommunications channel connection, in the absence of other notification...
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5708654 |
Method for detecting proxy ARP replies from devices in a local area network
A method in a LAN test instrument for detecting proxy ARP agents and misconfigured routers in a TCP/IP LAN is provided. The method first allows for detection of routers running proxy ARP for the...
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5701410 |
Method and system for detecting fault conditions on multiplexed networks
A method for detecting fault conditions on a multiplexed network having first and second busses. The method includes sensing a start of frame delimiter (SOF) for the first bus, and determining the...
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5699403 |
Network vulnerability management apparatus and method
A data processing system is provided for identifying risks associated with abnormal conditions of network elements in a communications network. A data collection and processing module collects...
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5699348 |
Method and apparatus for error performance monitoring of a leased telecommunication circuit
A method and apparatus for use in monitoring and analyzing statistical parameters corresponding to errors occurring in the transmission of data signals in a telecommunications network is disclosed....
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5696777 |
Device for the serial transmission of data between at least two terminals
A device for the serial transmission of data between at least two terminals which are interconnected via a two-wire line. Each terminal has a bus-coupling circuit having at least one transmitting...
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5696513 |
Signal transmitting apparatus
An apparatus for transmitting a signal which is capable of connecting an N-number of main lines and one auxiliary line using an N-number of transmission switches (N denotes 1, 2, 3, . . . , n),...
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5689546 |
Performance monitoring system for T1 telephone lines
A system for monitoring the performance of T1 digital transmission lines by incorporating a common unit interconnected to a plurality of network interface units as well as to a spare transmission...
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5680389 |
Data transmission system
A data transmission system comprising a transmit unit 2 having a buffer 22 for generating a delayed version of the transmitted data signal and the receive unit 4 comprising a buffer 47 for...
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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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5661720 |
Multi-ring network having plural rings connected by node
A multi-ring network structured by connecting a plurality of rings having different speeds. The multi-ring network includes a first ring structured by connecting a plurality of first nodes by a...
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5644706 |
Failure detection and reporting for a computer mail gateway
Failure detection and reporting for a computer mail gateway is provided. In a preferred embodiment, two computer mail systems are connected by a gateway. The gateway includes an automatic gateway...
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5642347 |
Approach to direct performing asynchronous transfer mode (ATM) adaptation layer 5 reassembly
A method of transferring data from an ATM (asynchronous transfer mode) physical device to an application specific circuit (ASIC) comprised of receiving a continuous stream of ATM cells from the ATM...
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5633857 |
Apparatus and method for controlling data transmissions in a communication network
An apparatus for controlling data transmissions in a communication network which includes a plurality of nodes connected to a common bus, each of said nodes having a communication processor with a...
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5627821 |
Defect notification method in a multipoint ATM network
A defect notification method and apparatus for use in a multipoint ATM network so as to avoid the transmission of defect notification cells in an overlapped manner. In the invention when a...
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5566162 |
Method of sectionalizing trouble on telecommunication network connections
In telecommunications involving more than one network, it is important to determine the location of a fault which may occur on a connection so that the responsible network administrator can be...
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5565856 |
Abnormality detecting device for vehicle communication system and method of using same
The present invention provides an abnormality detecting device for a vehicle communication system comprising controllers and a diagnosis unit. The controllers store data to be transmitted by means...
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5513191 |
Asynchronous transfer mode (ATM) cell error processing system
An Asynchronous Transfer Mode (ATM) cell error processing system includes a plurality of error detectors for respectively detecting predetermined cell errors and for respectively generating...
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5504737 |
Monitoring multiplex transmission system having a respective controller for each of a number of transmission devices in the system
A multiplex transmission system includes a number of multiplex transmission devices connected to each other via a common transmission line for transmitting frames of data. Each frame of data...
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5491572 |
Method and system for detecting trouble in two-way single-fiber optical transmission
A method for detecting trouble occurring in a single-fiber two-way optical transmission system containing first and second optical terminal stations connected to each other through at least one...
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5461628 |
Network system capable of network elements with decreasing load of a monitoring device
A network system comprises a plurality of network elements connected to one another and a monitoring device for monitoring the network elements. Each of the network elements produces first through...
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5461623 |
Data transmission system with abnormality discrimination
A receiving node of a data transmission system receives data frames transmitted from a transmitting node through a transmission line. Each frame includes a node abnormality discrimination flag and...
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5455832 |
Method and system for testing a sonet network element
Method and system are described for testing SONET network elements (NE) against various SONET logical layer criteria or standards. A "basic" signal is developed or generated to meet many of the...
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5450440 |
Monitor system for digital communication apparatus
In a monitor system in a digital communication apparatus including communication processing blocks on transmission paths of digital data, test data inserting units and data monitor units are...
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5450403 |
Method and apparatus for multiplex transmission
A multiplex transmission apparatus includes a communication control circuit connected to a bus for successively receiving data from the bus, and the received data is output from an output port to a...
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5450416 |
Apparatus and method for testing multifunction communications networks
An improved apparatus and method for isolating faults in a complex communications network such as a collision-detection network. A wrap plug connected to a communications adapter of a computer...
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5408475 |
Modem with transient impairment detector
A frame code word (FCW) is inserted in a time division multiplexed slot in a modem data stream preferably using an embedded secondary channel. A receiving modem demultiplexes the FCW and compares...
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5406255 |
Duplexed communication system
A communication system comprising at least one working system for receiving a signal from a source, at least one protection system for receiving the signal from the source, a detection part for...
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5394408 |
Policing control apparatus
A policing control apparatus having a cell input terminal receiving asynchronous transmission communication network cells; a policing circuit coupled to the input terminal for policing transmission...
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5392327 |
Termination unit with maintenance facility
There is a demand for user access to ISDN services at the two-wire interface point. The frequently raised objection to such access is the problem of determining the location of a fault and hence...
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5369653 |
SONET transmission signal processing method and SONET transmission signal processing apparatus
A VT (Virtual Tributary) size setting section 3 allows selection of the VT size desired by the user of the apparatus by accepting setting data inputted by the user of the apparatus. The VT size...
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5367395 |
Apparatus for detection and location of faults in two-way communication through single optical path
In a first apparatus, transmission signals are inverted in a sending side and are restored in a receiving side in one direction of two-way communication, and transmission signals are not inverted...
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5323145 |
Alarm collection architecture with redundant bus
A master slave architecture includes a common power supply on a common distribution bus that is used by the master to provide a separate alarm power bus to all of the slaves for powering their...
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5309448 |
Methods and systems for alarm correlation and fault localization in communication networks
An approach for modeling and solving the problem of fault localization and alarm correlation in large communication networks is presented. Specifically, a new alarm structure is presented along...
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5295132 |
Multiplex transmission apparatus with transmission line fault detection
A multiplex transmission apparatus in accordance with the present invention is interconnected with other multiplex transmission apparatuses via common transmission lines, and it is used for a...
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5278977 |
Intelligent node resident failure test and response in a multi-node system
In a distributed, multi-node system for communicating between a plurality of distributed terminals and one or more central computers, some of which specify command and control information to the...
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5274697 |
Automatic data restoral for modems
Automatically restoring data transmission by monitoring line degradation and switching to a new line (or lines) when line quality falls below a prescribed standard. Data transmission is maintained...
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5274367 |
Device for in-service monitoring of communication transmission equipment
In a device for error locating and/or in-service monitoring for communication transmission equipment comprising a call unit (7, 8) that exchanges information with processor units (6) and wherein...
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5252914 |
Method of constructing and testing a circuit board designed for early diagnostics
An apparatus and method of modular electronic printed circuit board design for a radio communication transceiver in which the electronic circuitry forming a transmit/receive circuit board of the...
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5212475 |
Method for generating an alarm inhibit signal
A method for generating an alarm inhibit signal. A modified AIS-Signal in the form of long strings of ones signal with the addition of an identification character is provided. This identification...
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5197062 |
Method and system for simultaneous analysis of multiplexed channels
A method and system for test data generation, reception, synchronization and analysis of multiple channels within a multiplexed data stream is described herein. Latches on the parallel inputs and...
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5191583 |
Method and apparatus for effecting efficient transmission of data
Method and apparatus are disclosed for a data communications system in which data packets are transmitted between two data terminal units wherein idle packets are transmitted whenever there is no...
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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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5155859 |
Simulcast transmission system having automatic audio equalization
A simulcast transmission system (150) is disclosed in which a primary (402), a first, and a second transmitter site (302) form a first communication loop (403). The first communication loop (403)...
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5101403 |
Apparatus for processing signalling messages in an asynchronous time division telecommunications network
The apparatus comprises a protocol processor circuit connected to a network, a memory having a transmit memory and a receive memory, a transmit control memory and a receive control memory. The...
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