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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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5097469 |
Passive monitor for broadcast communication network
The invention is a network monitor that passively detects sequences of control frame transmissions. Detected control frame sequences are compared to a model of the expected exchange of control...
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5058104 |
TDM demultiplexer with dedicated maintenance channels to indicate high-speed line faults to low speed circuits
In a channel bank at one of TDM hierarchical levels, a TDM demultiplexer includes a plurality of high-speed interfaces connected respectively to high-speed digital transmission lines. Each...
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5012120 |
Load control system and method for disconnecting sub-bus from main-bus
Load control system is for disconnecting abnormal sub-bus from main-bus; The load control system has switching circuit (50+51) for connecting the sub-bus (1A, 1B . . . 1N) to the main-bus (2) or...
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4993013 |
Monitor system for multiplex equipment
A monitor system for a multiplex equipment, comprising a multiplexing unit for multiplexing low speed group input signals of plural channels into a high speed group output signal and a...
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4977579 |
Test set for a navigational satellite receiver
A test set including a digital card tester section and a satellite simulator section is used to detect the reduced capabilities of an associated navigational satellite receiver and to isolate...
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4973953 |
Data transmission system with improved fault
A system of transmitting data and frame signals distinguishable from the data between a plurality of nodes linked in ring form. Each node comprising two transmitter circuits for simultaneously...
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4967193 |
Digital loop carrier system having CPU to channel unit protocol
Digital loop carrier system having CPU to channel unit protocol. A method of communicating with the protocol is used in a telecommunication system having at least a central processing unit (CPU)...
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4964122 |
TDM data transmission system
A system for transmitting digital data by time division multiplex (TDM) includes a transmission terminal for transmitting a TDM data stream having a frame structure which includes fixed stuff bytes...
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4953195 |
Private branch exchange system with specific information transmitting function
A private branch exchange system connects a plurality of extension terminals to a digital network via a digital trunk circuit and a channel service unit. When a failure occurs between the digital...
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4947451 |
Multiple accessing satellite communication system having standby central station
In a satellite communication system wherein a common channel is used for communication between a central station (10) and a plurality of remote stations (12) through a satellite transponder (11),...
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4912699 |
Pulse code modulation terminal equipment
A pulse code modulation terminal equipment, having a first hold circuit which continuously supplies a multiplexer unit with a seizure signal supplied from a seizure supervisory circuit during a...
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4910728 |
Multiplexer diagnostic input patterns
Binary logic states (ONE, ZERO) are presented to the data inputs (24) of a multiplexer in a pattern characterized by a reversal of the binary logic states at input boundaries defined numerically as...
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4890224 |
Method and apparatus for fault tolerant communication within a computing system
A method and apparatus for fault tolerant communication among a plurality of I/O controllers and a communication controller using an I/O bus having byte-parallel and bit-serial data lines. Each...
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4882730 |
TDMA communication system having common time slots for system maintenance
A deman assignment TDMA communication system includes first and second time division multiplexed (TDM) transmitting channels for establishing a broadcast channel from the central station to the...
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4881230 |
Expert system for processing errors in a multiplex communications 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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4860284 |
Method and apparatus for identifying location of a lost token signal in a data communication network
Apparatus and method for identifying the location of a lost token signal continuously transmitted on transmission paths interconnecting nodes of a network to sequentially enable the nodes to write...
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4860280 |
Apparatus and method for a secure and diagnosable antijabber communication circuit
In order to prevent `jabber`, the uncontrolled transmission of messages on a communication channel, an antijabber timing unit is frequently used to determine whether a message on the communication...
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4845711 |
Multiplexing and demultiplexing method and equipments measuring transmission quality and locating operation faults on multiplexed digital channels
A predetermined characteristic of each of incoming plesiochronous component signals in a time-division multiplexing equipment is derived at each stuffing time for transmission in the form of a...
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4811015 |
Abnormal data transmission detection circuit for time-division multiplex transmission network system
A circuit for detecting an abnormal transmission state on a signal transmission line, the abnormal state being such that a short-circuit or open-circuiting occurs in the signal transmission line,...
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4759009 |
Remote digital carrier alarm and terminal by-pass system
A T1 digital carrier system having a master terminal and four serially coupled remote terminals. Each remote terminal has a by-pass switch for automatically by-passing that remote terminal should 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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4710919 |
Multiplex system for automatic meter reading
A remote meter reading system employing a plurality of multiplexers coupled between the telephone central office and remote interrogatable utility data sources. A number of lines are connected to a...
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4663754 |
Remote control system for data communication utilizing modems
A remote control system for data communication includes a local modem as an initiating modem and a remote modem as a responding modem coupled by an analog duplexed channel, and a pair of...
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4654890 |
Multiplex communication system
A multiplex communication system comprises a central control unit, a plurality of local control units, an optical loop transmission path interconnecting the central control unit and the plurality...
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4597072 |
Method and apparatus for the examination of the internal interconnection system between n terminals of an electrical network
A method for the examination of an internal interconnection system between n terminals of an electrical network and for storing the results in a memory comprising n memory cells by means of...
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4567587 |
Multiplex equipment monitoring apparatus
Monitoring or error checking equipment for use with multiplexing circuitry at the transmission end of a communication line is disclosed which accomplishes a large reduction in circuitry by using...
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4567595 |
Multiline error detection circuit
A communication method and digital multi-customer data interface for interconnecting a number of customer terminals to a main packet switching network of a local area data transport system that...
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4547633 |
Method of and circuit for locating faults in a digital telecommunication subscriber termination
For locating faults in digital telecommunication subscriber terminations various test loops (A, B, C) are closed and checked by signals transmitted via the exchange (16). When a fault is proved to...
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4471480 |
Programmable controller for a TDM digital multiplexer-demultiplexer combination
A common controller in the form of a programmed digital sequencer executes a series of instructions to control multiplexing-demultiplexing overhead channel format generation, frame synchronization...
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4423506 |
Wire data transmission system
In a wire data transmission system which transmits data from a master station to a number of slave stations or vice versa through a pair of signal wires connected in parallel with each other, only...
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4393492 |
Digital subscriber carrier system including drop terminals and bypass and loopback means and alarm indication means
A multi-channel digital subscriber carrier system for serving a multiplicity of subscribers one or more of whom may be located at points between the central office and the subscriber (furthest...
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4383312 |
Multiplex system tester
An apparatus for testing a data multiplex transmission system by providing simulated source and sink of data for the multiplex transmission system that is compatible with the multiplex system and...
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4376998 |
Muldem with monitor comparing means which accepts different data rates
A muldem (100) includes a transmit multiplexer section (103, 104) combining a variety of low speed and intermediate speed digital data inputs into a single high speed data output. A monitor (101)...
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4376999 |
Muldem with monitor testing on-line and off-line paths
A muldem (100) has a monitor (101) for testing data path failures through the muldem (100) by comparing the latter's input and output. The muldem (100) has normally on-line data paths (103, 104)...
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4347600 |
Monitored muldem with self test of the monitor
A muldem (100) has a monitor (101) for testing data path failures through the muldem (100) by comparing the latter's input and output. The monitor (101) tests itself by injecting errors into one of...
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4330885 |
Protected muldem with improved monitoring system and error detection
A muldem (100) has a monitor (101) for testing data path failures through the muldem (100) by comparing the latter's input and output. The monitor (101) includes comparing means (806, FIGS. 13a and...
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4266292 |
Method and apparatus for testing analog-to-digital and digital-to-analog code converters
An apparatus and method for testing for faults in an analog-to-digital (A/D) section and a digital-to-analog (D/A) section of a code converter in a digital time division, multiplex...
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4260859 |
Method and apparatus for detecting transmission system failures in a communications network
The failure of an interoffice carrier transmission system is detected by monitoring the signaling irregularities on the trunks served by the system. When at least two trunks fail to return a...
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4208552 |
Malfunction-detecting equipment for real-time supervision of central-office circuits in telecommunication system
Sensors SE and actuators AT electrically linked to groups of circuit components to be monitored, e.g. in a central office of a telephone system, are connected to a preprocessor, interfacing them...
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4172963 |
Checker and automatic synchronizer for coding equipment
1. A system comprising a pair of stations having two parallel communication links therebetween, means for transmitting coded data signals of varying levels between the stations in opposite...
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4152543 |
Installation for time multiplexing and transmitting telephone signals or data between a plurality of subscribers
An installation for transmitting telephone signals or data with time multiplexing for a plurality of subscriber sets divided into a number of groups. At least one pair of multiplexing gates...
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4096354 |
Apparatus for distinguishing between failures in a digital transmission network
At a channel bank, such as a D-type channel bank used in the Bell System, a steady visual alarm is exhibited if the source of a detected failure is at a location either within the channel bank or...
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4071700 |
Testing apparatus
Apparatus for testing the operability of a signal translation means which passes signal information containing a definable and repeatable characteristic such as a synchronization signal through the...
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3996423 |
Common control failure alarm apparatus
A local alarm circuit and a remote alarm circuit carry out a plurality of failure monitoring and alarming functions for each of a plurality of digital groups (digroups), of time division...
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3919484 |
Loop controller for a loop data communications system
A loop controller for a time division multiplexed loop communications system. The loop controller is connected in series with a plurality of data processors in a loop configuration. The loop...
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3909720 |
Performance monitoring/fault location test set for tropo-radio equipment
A performance monitoring/fault location apparatus for tropo-radio equipment for measuring the performance status of on-line, in service troposcatter radio equipment.
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3864523 |
METHOD FOR TESTING A MULTIPLEX TRANSMISSION SYSTEM
A method for testing multiplex transmission systems which includes generating a number of different square wave impulse sequences where each of the impulse sequences comprises at least four...
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