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Class 370/449 - Polling


Subclass of Class 370 - Multiplex communications
Definition: Subject matter in which individual terminals are queried
No. of patents: 638
Last issue date: 05/15/2012


                    16  
NumberTitleIssue Date
4598399Multichannel multisite signal protection channel switching apparatus
A way to reduce costs in a communication network is to use through-repeaters for any signal channels that do not need to have data dropped or inserted at a given site. This however complicates any protective switching involved to bridge failed data channe...
07/01/1986
4595921Method of polling to ascertain service needs
In a communication facility a masterstation initially directs a single inquiry signal to the aggregate of the operating stations and receives a response from this aggregate indicating by its structure which of the several individual stations currently nee...
06/17/1986
4593283Data communication system with timed access to link
In an on-line system composed of a high rank unit and a plurality of terminal units connected thereto, various causes may produce a time-out in one of the terminal units. When a data link for a terminal unit is not established in a prescribed time resulti...
06/03/1986
4586175Method for operating a packet bus for transmission of asynchronous and pseudo-synchronous signals
Data transactions and voice communications are facilitated in a packet switching system including a group of ports each of which is capable of exchanging inter-destined and intra-destined information signals via a packet bus. The packet bus is operated un...
04/29/1986
4584680Use of a tone bus to provide polling and data distribution apparatus for communication system terminal groups
A combined telecommunications and data communications system includes a digital switching network for allowing connections between one or more of a plurality of ports. The system described includes a tone module at one port which module includes a tone bu...
04/22/1986
4583088Method and apparatus for controlling access to a communication network
A communication system comprises several transmission bus segments (A . . . G) to which data stations (ST) are attached. Node units (1 . . . 7) are provided for interconnecting the bus segments which are selectively activated in a predetermined sequence f...
04/15/1986
4581733Telecommunication exchange
In a small business-type telephone exchange, calls are set up in TDM manner using PCM to convey speech and data if the exchange serves any data terminals. The exchange has subscriber line ports (SLC) each serving two lines and a smaller number of trunk li...
04/08/1986
4546467Monitor for transmission line
A monitoring device for monitoring the status of communication units connected to a common transmission medium. The monitoring device sequentially addresses each communication unit and transmits to the addressed unit an inquiry frame which includes in add...
10/08/1985
4536838Multi-processor system with communication controller using poll flags for non-contentious slot reservation
A communication controller for a distributed processing system has a number of data processing stations in which messages are exchanged among the stations over a communication channel. The controller includes a communications processing unit which manages...
08/20/1985
4534025Vehicle multiplex system having protocol/format for secure communication transactions
An improved serial data protocol/format is provided in a serial multiplex system for use in an automotive vehicle electrical system which is subject to electrical noise. The protocol/format includes successive transactions between a master controller and ...
08/06/1985
4528662Multiplex 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 and one or more remote stations with high integrity. The cen...
07/09/1985
4507777Protocol for determining physical order of active stations on a token ring
A reconfigurable serial loop or ring communication system is provided with a method and apparatus which enables stations on the loop to ascertain the address of its nearest active upstream neighbor (NAUN). A Ring Poll Frame is generated and broadcast from...
03/26/1985
4429382Microprocessor multiplexer method and apparatus for bisynchronous data
A microprocessor-controlled method and apparatus for handling transfer of data in bisynchronous protocol between a data source and a data transmission link. The apparatus responds to particular character sequences to request allocation of transmission cap...
01/31/1984
4424417Method for establishing DAMA radiotelephone conversations by single-span satellite transmission
In a radiotelephone system comprising a ground central station and a plurality of peripheral stations having access to a geostationary satellite, demand-assignment multiple-access (DAMA) conversations are established by single-span transmission between su...
01/03/1984
4423507Communications system for interconnecting a plurality of asynchronous data processing terminals
A communication system connects a number of asyncrhronous remote data processing terminals, operating at different speeds, to a high speed switching and communication network. One or two telephone pairs are used as a TDM link between the terminals. The nu...
12/27/1983
4416008Dual loop type data highway system
A dual loop type data highway system comprises a data highway having at least two loops for data transmission and reception, a plurality of data transmitting/receiving stations serially connected to the data highway and a control station serially connecte...
11/15/1983
4410983Distributed industrial control system with remote stations taking turns supervising communications link between the remote stations
A control system for controlling an industrial process includes a plurality of remotely located process control units (remotes) each coupled to an associated input/output device(s) and adapted to communicate with one another through a dual channel communi...
10/18/1983
4385382Communication multiplexer having a variable priority scheme using a read only memory
A data processing system includes a number of input/output devices coupled to a communication multiplexer which polls the devices in a predetermined order. Apparatus in the communication controller rearranges the polling order to provide highest priority ...
05/24/1983
4380065Communication multiplexer variable priority scheme
A communication multiplexer stores the receive and transmit channel numbers of input/output devices coupled to the multiplexer by communication lines in a first-in-first out (FIFO) memory. The input/output devices are polled by sending the channel numbers...
04/12/1983
4360912Distributed status reporting system
A modular bus system for reporting the status of a plurality of geographically distributed data points. The data points may be independently located or grouped with the status of each being monitored by a processor which is coupled to the data points via ...
11/23/1982
4330855Apparatus for multiplexing digital signals
The invention is an apparatus and method for multiplexing digital informan acquired from a multiplicity of data terminals distributed along a conductor of given length. A cyclic synchronization signal consisting of a stream of coding periods is transmitt...
05/18/1982
4326289Expandable communication system
A communication system in which individual stations are connected to a control center by a transmission medium common to all of the stations to allow the transmission medium common to all of the stations to allow the transmission of messages in the form o...
04/20/1982
4325146Non-synchronous object identification system
A transponder/interrogator system for remotely identifying objects. The interrogator emits optical pulses to activate the transponder. Upon such activation, the transponder emits a unique code in the form of optical pulses in accordance with a program sto...
04/13/1982
4316283Transparent intelligent network for data and voice
A transparent intelligent communication network with improved capability for handling data independent of customer protocol. In a situation where connection is made to an X-25 computer and to a polled line, the network strips off the user protocol and onl...
02/16/1982
4293947Information handling system
An information handling system particularly suitable for motor vehicle use. A master station is arranged to transmit information to, and to receive and display information from, a plurality of sequentially-addressed peripheral stations. Synchronization an...
10/06/1981
4287567High speed central office scanner
The invention relates to a high speed central office scanner for use with a plurality of transponding units connected by telephone lines. The scanner is comprised of N, I/O units, each comprised of a multiplexer for connecting the I/O units to M telephone...
09/01/1981
4254496Digital communication bus system
A digital bus system for the transmission of pulse code modulated speech and control data between a common multiplexer and a multiplicity of line circuits in a telecommunications system. In the past the line circuits were multiplexed directly onto a commo...
03/03/1981
4199662Hybrid control of time division multiplexing
A hybrid multiplexing method and communications system for controlling transmission of information between a plurality of remote terminals and a shared central facility over a common communications channel. The remote terminals are synchronously polled to...
04/22/1980
4149144Polling and data communication system having a pulse position to binary address conversion circuit
A poll command is sent by a central station to a plurality of remote stations connected along a data highway system. Upon receipt of the poll command, a remote station which desires to transmit data to the central station, responds with a reply pulse in a...
04/10/1979
4139737Time division multiplex transmission system in which electrical power is transmitted to remote terminals from a central unit simultaneously with address and control signals
A time division multiplex transmission system including a central unit and a plurality of terminal units connected through a single pair of bus lines to the central unit. The central unit transmits at least a set of address and control signals sequentiall...
02/13/1979
4100533Multipoint polling technique
A multipoint polling system wherein a multipoint switch selectively connects a plurality of remote terminals to a central station in response to remote terminal addresses transmitted on a signaling path to the multipoint switch. Polling apparatus stores p...
07/11/1978
4095045Method and apparatus for signaling in a communication system
A method and apparatus are disclosed for using a specified pattern of signal events for signaling in a digital communication system. Illustratively, detection of a first event in a control signal activates timing apparatus which looks for a second event i...
06/13/1978
4051328Method for operating a digital time division multiplex communication network
A digital time division multiplex communication network wherein the subscriber terminals are disposed in a fixed order on a TDM trunk going out from and ending in the terminal exchange is described. The data intended for the subscriber terminals are sent ...
09/27/1977
4037199Apparatus for sensing, transmitting and displaying signal states
Apparatus for sensing, communicating and displaying signal states in a multiplicity of functional units is described. A signal multiplexer is assigned to each given functional unit; the multiplexer inputs are connected to signal lines carrying the signal ...
07/19/1977
4032714PCM time division multiplex communication network with digital subscriber stations
A PCM time division multiplex communication network is disclosed having a central processing office and digital subscriber stations. A special code word is prefixed to the PCM data sent by the central processing office to designate the intended subscriber...
06/28/1977
4016369Addressing arrangements for communications networks
An addressing arrangement is disclosed for systems in which communication is required between a main device and a plurality of associate devices. In the arrangement, access messages are used corresponding to states of shift register sequences. When the ma...
04/05/1977
4000378Data communication system having a large number of terminals
A large number of terminals are connected to a central computer in a loop utilizing a very high speed transmission medium. A sequential stream of message blocks are provided for transmission by the loop. Each message block includes a first portion specify...
12/28/1976
3990036Multiplexing method and apparatus for telemetry of seismic data
A single time-multiplexed channel for telemetry of seismic data from a plurality of remote, spaced-apart sensors to a central recording device. All of the sensors are identical and interchangeable. A unique polling signal is transmitted over a telemetry l...
11/02/1976
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