|
Match
|
Document |
Document Title |
|
|
4586186 |
Maintenance response signalling arrangement for a digital transmission system
A maintenance response signalling arrangement for a digital transmission system transmits response signals from a repeater to an end terminal. From the repeater, response information is modulated...
|
|
|
4570257 |
Communication system with slot time error detection
A data communication system allocates use of a common data communication medium shared by a plurality of stations. During each transmission cycle, the communication medium carries data packets of...
|
|
|
4562571 |
Speech processing device for radioelectric equipment adapted for speech transmission and reception
The device is of the type comprising a circuit for compressing the dynamic of the speech signal before transmission of the signal at constant level and an expander for re-establishing at reception...
|
|
|
4528662 |
Multiplex control system having enhanced integrity
A serial data communications system, particularly for use in an automotive environment is disclosed in which bidirectional serial data communication is effected between a central control station...
|
|
|
4506360 |
Multi-station token pass communication system and method
A data communications system is disclosed which uses a passive communications medium such as coaxial cable for communication between multiple stations connected to the bus. A token concept is...
|
|
|
4455647 |
Apparatus for establishing multi-address connections
A digital data telecommunications system comprises a central switching system and a plurality of line terminators each connecting the switching system to a pair of incoming and outgoing lines and...
|
|
|
4399531 |
Distributed digital data communications network
A distributed digital data communication network having widely dispursed nodes provides for effective transmission of messages between each node through the use of flood routing. A response message...
|
|
|
4385380 |
Digital concentrator switch
In a fully digital telephone switching system, a digital switch may serve a number of PCM sub systems each having separate forward and reverse highways and each serving a number of subscribers'...
|
|
|
4381427 |
Subscriber loop system for voice and data
A subscriber loop system in association with a TDM telephone system provides voice and data communication with a remote telephone station set and an associated data port. The subscriber loop system...
|
|
|
4370561 |
Vehicle multiplex system
A vehicle multiplex system includes a power conductor for conveying electrical power to power-operated units on the vehicle, and a single signal conductor for controlling the connections of power...
|
|
|
4287592 |
Method and apparatus for interfacing stations in a multiloop communications system
A multiloop communications system and a method of routing data between stations is disclosed. The communications system has a plurality of interconnected communications loops, each of the loops...
|
|
|
4273955 |
System for in-service quantitative performance analysis of data communications system
A data communication system is provided comprising, at a plurality of locations, data terminal equipment. Communication equipment adapted to transmit and/or receive data from location to location...
|
|
|
4245342 |
One-for-n modem control apparatus
Communications apparatus includes one-for-n modem redundancy for a plurality of typically contiguously disposed modem modules. The modem modules comprise n active units each illustratively...
|
|
|
4229816 |
Timing signal generation and distribution system for TDM telecommunications systems
Synchronous operation of any number of digital switching units of a TDM system is maintained by interconnecting the switching units to a timing signal highway which distributes timing signals...
|
|
|
4213015 |
Failure alarm for a transmission line communications system
A power failure alarm circuit for a transmission line communications system such as a telephone system having means for transmitting and receiving carrier signals connected to a trunk line at an...
|
|
|
4144406 |
Time-multiplex modular switching network for automatic exchange
The time-switching network according to the invention has an inlet stage, an outlet stage, and a selection switching stage, respectively comprising M, M, and N groups. It includes line equipments;...
|
|
|
4127816 |
Carrier detect and automatic loopback circuit
A master station communicates with remote stations by respective transmit-receive pairs. Quadra-phase modulation is utilized, involving a carrier having two characteristic frequencies not present...
|
|
|
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...
|
|
|
4059731 |
Signaling storage in digital channel banks
In a digital channel bank, the binary signaling states (on-hook, off-hook) are updated periodically for each channel. Some number (n ≥ 2) of the most recent of these samples are stored at the...
|
|
|
3962646 |
Squelch circuit for a digital system
A digital system for receiving digital messages transmitted in a polybinary code having a squelch circuit for inhibiting operation of the system during improper operation, said squelch system...
|
|
|
3940566 |
Arrangement for preventing interruptions in a time division multiplex transmission link for transfer of data
The present invention relates to an arrangement in a time division multiplex link having at least two pairs of multiplexors and demultiplexors interconnected by separate transmission lines, i.e.,...
|
|
|
3920921 |
Line equipment for scan and control system for synchronized PCM digital switching exchange
Among the line equipment serving a synchronized PCM TDM digital switching exchange, there is provided a supervisory scan and control system for interfacing the operation of incoming and outgoing...
|
|
|
3839707 |
FAULT-ALARM AND CONTROL FOR A MICROWAVE COMMUNICATION NETWORK
A maintenance system and method is provided to alarm faults detected in a switched-data microwave communications network, and to initiate control messages for corrective action. Located at the...
|
|
|
3829777 |
CONTROL SYSTEM FOR DIVERSITY TRANSMISSION IN A TERRESTRIAL STATION OF SATELLITE COMMUNICATION
A control system for diversity transmission from a terrestrial station which performs time-division multiple access to a satellite communication repeater through a selected one of a plurality of...
|
|
|
3809818 |
MEANS AND METHOD FOR TELEPHONE LINE DISCONNECTION IN FREQUENCY DIVISION MULTIPLEXING
Transmission failure in frequency division multiplexing connected to telephone systems results in the generation of a disconnect tones, one for each carrier, which are simultaneously superimposed...
|
|
|
3725593 |
PCM TELECOMMUNICATION SYSTEM WITH STANDBY CLOCK
At a main terminal connected to a remote terminal by way of a PCM signal path, a master clock controls the multiplexing of incoming messages from local lines for transmission over an outgoing line...
|
|
|
3622707 |
MULTIPLE CHANNEL SUBSCRIBER LOOP
A time division multiplex system for use with subscriber stations utilizes a pilot tone to control switches which connect subscribers to the common line during designated portions of each cycle....
|
|
|
3614327 |
DATA MULTIPLEXER USING TREE SWITCHING CONFIGURATION
A data multiplexer is disclosed in which FETs are arranged in a tree switching configuration of n columns and are driven by n drivers to control the multiplexing of data from 2 n sources. Each...
|
|
|
3564145 |
SERIAL LOOP DATA TRANSMISSION SYSTEM FAULT LOCATOR
Terminals in a serial loop data transmission system automatically monitor input data to detect no data and mutilated data conditions. When either condition is detected, signals including the unique...
|
|
|
3227809 |
Time division multiplex electrical signalling systems
|
|
|
3157744 |
System for coordinating a plurality of synchronized time division multiplex systems
|
|
|
3138670 |
Automatic test equipment for multiterminal communication systems
|
|
|
3099716 |
Diversity communication system
|
|
|
2986610 |
Alarm and test equipment for carrier systems
|
|
|
2927968 |
Line switching systems
|