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6023774 |
Computer system having facility for detection of data abnormalities
A computer system which includes data transmission line and a plurality of data transmissions apparatuses connected in parallel to the data transmission line. Each data transmission apparatus...
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6014368 |
Packet multiplexing system
A multiplexing system which detects multiplexing errors, includes PES packetizing modules that packetize elementary streams (ES) to produce packetized elementary streams (PES), and a TS/PS...
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6011780 |
Transparant non-disruptable ATM network
A method and apparatus for the transparent, non-disruptable transfer of data, particularly multimedia data, through any packet-based network, such as an ATM network is provided. The method of the...
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6009079 |
Method for measuring HDT-NIU availability
The polling features of a resident hybrid fiber/coax (HFC) network platform are used to poll between a link a hybrid digital terminal (HDT) and a network interface unit (NIU). In the absence of a...
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5982752 |
Method and apparatus for detecting multiplexing standard mismatches in communication networks
A test of digital communications facilities identifies facilities that have AMI/H8ZS line coding mismatches. A test apparatus and method transmits a test tone signal simultaneously on contiguous...
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5974030 |
Subscriber multiplexer, a telephone system and a method for communicating the condition of a subcriber interface
A subscriber multiplexer includes a receiver for receiving signals transmitted from subscriber interfaces a feeder and for feeding those signals further to a telephone exchange via a respective PCM...
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5974046 |
Maintenance method for subscriber lines of broadband network termination apparatus in an asynchronous transfer mode permanent virtual connection switching system
A maintenance method for a subscriber line of a B-NT in an ATM PVC switching system which is capable of more expanding a maintenance range of an OAM cell loopback function disclosed in the article...
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5974045 |
OAM processing device in an ATM network
An OEM processing device for supporting operations, administration, and maintenance (OAM) in an ATM network, whose control circuit has a simplified configuration that avoids duplexity of common...
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5970051 |
Reduction of errors in D4 channel bank by multiframe comparison of transmit enable lead to determine whether analog channel unit is installed in D4 channel bank slot
The problem of digital data corruption heat occurs when an analog card is inserted into a card/time slot of a D4 channel bank is effectively remedied by sampling and analyzing the channel bank's...
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5970064 |
Real time control architecture for admission control in communications network
A communications network comprising N node elements operates N decision tables for controlling admission and control of data communications to the N node elements (FIG. 2). The performance of the...
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5963545 |
Fault evaluating system for transmission apparatus
In a fault evaluating system for a transmission apparatus having four packages which are mutually duplexed in both transmission and reception directions and bridged to oppose each other, each...
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5956384 |
Apparatus and method for automatically detecting defective lines in a cable and for automatically switching from the defective line to an extra line
An automatic broken cable detecting and switching apparatus and a method therefore. The apparatus includes a transmitting microprocessor for controlling the abnormality of the cable, a transmitting...
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5954796 |
System and method for automatically and dynamically changing an address associated with a device disposed in a fire channel environment
A computer system with a plurality of devices compatible with the Fibre Channel Protocol, which computer system is provided with the capability to dynamically alter the configuration of the...
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5956324 |
Performance monitoring and test system for a telephone network
A DS3 level access, monitor and test system for a telephone network. The system provides selective, and hitless, bit overwrite in any of the embedded DS1, DS0 and subrate channels in a DS3 signal....
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5946373 |
Topology-based fault analysis in telecommunications networks
A method and apparatus for detecting traffic-affecting failures in a telecommunications network; by inferring the most probable location of each such failure, given multiple alarm indicators along...
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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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5943319 |
Packet format interface for telecommunication instruments
Improved telecommunication apparatus is realized with a structure that is tailored to interact with the telecommunication network strictly in packet format. The apparatus includes circuitry for...
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5936941 |
Communication system including management terminal and plurality of communication terminals and enabling quick maintenance and management
A communication system including a management terminal and a plurality of communication terminals connected to a communication network via network termination unit etc., wherein the management...
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5937032 |
Testing method and apparatus for verifying correct connection of curcuit elements
A method and apparatus for testing for correct connection together of circuit elements in a circuit formed of a plurality of redundant circuit portions. A coded signal is generated at a first...
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5920257 |
System and method for isolating an outage within a communications network
A system and method for isolating an outage within a communications network comprising a database containing the configuration of switching elements within a network and a plurality of instructions...
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5917426 |
Network system capable of managing connection data
In a switch network system which has a plurality of network input terminals and a plurality of network output terminals and a plurality of switch matrices between the network input terminals and...
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5905585 |
Optical bidirectional transmission system and method having transmission-line-disconnection detecting function
A first transmitting unit provided in a first station transmits a first optical signal to a second receiving unit provided in a second station via an optical transmission line, the first optical...
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5905714 |
Method for rerouting a packet-mode data connection
A method for rerouting a packet-mode data connection, especially a frame relay network data connection, in which, traffic transmitted between two nodes is transferred from a first route to be...
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5903613 |
Data reception device, data reception method and electronic equipment
The invention relates to a data reception device for receiving packetized data in the form of a differential signal. This device comprises a data reception section that generates a digital signal...
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5889864 |
Data transmission systems
In a data transmission system in which a cyclic redundancy checksum value is derived in respect of each block of data bit values to be transmitted over the system, the checksum value in respect of...
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5881052 |
Line signal analyzing method for use in an electronic switching system
A method for use in an electronic switching system (ESS) analyzes M×N sets of line signals communicating between itself and at least one other ESS. At a first step, two previous sending and...
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5878030 |
Test access port for analyzing high-speed local area network switched environment
An interfacing device having two operational amplifiers that have been manufactured on the same IC die have high-impedance input terminals connected directly to the two conductors of a local area...
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5878063 |
Method of detecting cell loss and exchange provided with cell loss detecting function
A cell count identifier inserting portion for inserting a cell count identifier into the header portion of a cell is provided at a predetermined position within an exchange and a plurality of cell...
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5841760 |
Transparent multiplexer/demultiplexer
A configuration for a SONET transport node comprises a pair of transparent mux/demuxs provided at two sites and connected over a high rate span. The T-Muxs provide continuity of all tribs and...
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5842026 |
Interrupt transfer management process and system for a multi-processor environment
An interrupt mechanism handles an interrupt transaction between a source processor and a target processor on separate nodes in a multi-processor system. The nodes are connected to a network through...
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5835499 |
Data processing device for FM multi-channel broadcasting
A scrambling key is generated from demodulated and error-corrected FM demodulation data for use in descrambling. During this process, if error correction has not been normally conducted to an...
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5822298 |
Ring transmission system for providing efficient transmission of management data
A ring transmission system includes nodes connected in a ring shape by transmission lines to communicate with each other. Each node includes a cell extracting unit which receives a cell from the...
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5815493 |
I/O module for a serial multiple data system with a data bus integrity checker
A programmable data link module is used on a time division multiplex data bus. The module receives data from the data bus during a selected time slot for a selected number of frames. The data link...
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5802105 |
Method and apparatus for testing a digital communication channel
A system and method for testing signal transmission quality within a digital communication system is disclosed herein. The system may be incorporated within a digital cellular communication system...
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5802073 |
Built-in self test functional system block for UTOPIA interface
An apparatus and method for providing a built-in self-test functional system block (BIST FSB) for self-testing a network interface integrated circuit having a Universal Test & Operations...
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5802144 |
Minimum common span network outage detection and isolation
A method and related system dynamically determines the location of a network outage in a telecommunications network. A plurality of alarm generating network equipments are located at spaced sites...
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5793750 |
System of communicating output function status indications between two or more power system protective relays
The communication system includes transmitting output status bits indicative of a function of the relay directly from one microprocessor-based protective relay in a power system to a second...
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5790531 |
Method and apparatus for determining the origin of a remote alarm indication signal
A method and apparatus for automated sectionalization of a DS1/DS3 data path based upon information received at a single location along the path. A test and monitor device is located at a point of...
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5784274 |
System and method for monitoring errors occurring in data processed by a duplexed communication apparatus
A performance monitor system monitors a number of errors occurring in data processed in a communication apparatus having a duplex configuration formed of two systems. The performance monitor system...
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5784407 |
Method and device for monitoring an abnormality in digitally transmitted audio signals
An analogue audio signal input to a transmission unit 1 is band limited into a frequency band lower than that of a main signal pass with a low-pass filter 21 and then converted into a digital value...
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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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5778003 |
Loop-back detection using out-of-band signalling
A method is described for detecting a loopback condition in a trunk. A predetermined bit pattern is inserted in an outgoing channel, and a corresponding incoming channel is continually monitored to...
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5774456 |
Method and apparatus for adopting performance report messages in a telecommunications system
A method and apparatus for automated sectionalization of a DS1/DS3 data path based upon information received at a single location along the path. A test and monitor device is located at a point of...
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5768261 |
System and method for identifying the technique used for far-end performance monitoring of a DS1 at a customer service unit
Described herein are a system and method of determining a far-end format of a customer service unit (CSU) operating using an Extended SuperFrame (ESF) framing format. The CSU is in communication...
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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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5757777 |
Apparatus for inspecting and setting the state of electronics audio/video devices
In order that an electronic device such as an audio or video device may be inspected and the state thereof may be set without making operation of the electronic device unstable when a rear cover is...
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5757775 |
Interface for detecting loss of call setup ATM cell to prevent misrouting in destination local network
An interface between an ATM network and a local network includes a cell disassembler for disassembling ATM cells from the ATM network and transmitting a disassembled signal to the local network. A...
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5757774 |
Network traffic protection system
A failure detector, connected to receive a signal from an interface at a lower level than the SONET level, detects a failure in that interface, such as a fiber cut or the loss of signals. An AIS...
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5748098 |
Event correlation
Simultaneous events reported to an equipment management system are compared with historical data in order to establish whether there is a relationship between the events. Historical data is used to...
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5740189 |
Integrity check method and system for serial-based communication
A method is provided for checking the integrity of a full duplex multi-word serial transfer between first and second devices, the transfer including an actual last word. The method includes...
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