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Match Document Document Title
6978313 Method and system for transporting generic data messages over the public switched telephone network to customer premises equipment without establishing a call  
Methods and systems are disclosed for transferring service application data from a server to a subscriber device via the PSTN without establishing a call between the server and subscriber device...
4320258 Arrangement for requesting service for called telephone subscribers  
An improved ringing control circuit in a stored program telephone switching system which provides a called subscriber an interval or window of time after answering a call to send a request for...
4258231 Remote line switching extension for telephone exchange  
There is described a remote switching terminal which functions as a concentrator switching stage for a central office switching system, such as a standard No. 5 crossbar switch. The remote station...
4110566 Switching network control arrangement  
A thyristor switching network is disclosed in which the switching network control provides both crosspoint audit and centralized control capabilities. The switching network control circuit contains...
4079206 Switching arrangement for a telephone system for connecting a calling subscriber set to an idle connector set upon recognizing a loop in the connector set  
A switching arrangement for a telephone system, wherein a subscriber circuit is connected over crosspoints of corresponding switching matrix stages to a junctor circuit feeding said subscriber...
3992592 Scanner-marker arrangement for telephone system  
A scanner arrangement for scanning both line circuits and incoming trunk circuits simultaneously in groups with priority being given to the scanning of incoming trunk circuits. A sequencing means...
3927273 Junctor memory  
An electronic private automatic branch exchange includes a digit decoder, a hold register, a line selector, a plurality of junctors and a junctor memory, the junctor memory having a plurality of...
3904831 Tone control arrangement for electronic PABX  
A tone control arrangement for an electronic telephone system wherein a plurality of tone generators are selectively connected to respective line circuits via a tone matrix under control of a...
3889068 Camp-on circuitry  
This specification discloses electronic camp-on control circuitry for use in a common control switching system serving as a private branch exchange. The system utilizes a crossbar switch network...
3865978 Node control circuitry  
A node control circuit for use in controlling cross points in multi-stage networks. The control circuitry tests every possible path through the network, cuts through the path that successfully...
3828314 END MARK CONTROLLED SWITCHING SYSTEM AND MATRIX  
Electronic switching systems employing three terminal, four layer PNPN-type thyristors having their gates brought out from the layer or region adjacent their anodes and characterized by having...
3806660 TRUNK CIRCUIT HAVING SELECTIVE INTERFACE COMBINATIONS  
A trunk circuit for an automatic exchange which includes a plurality of possible interface terminations with the outside world, which interface terminations may be selected by simply effecting...
3764751 METHOD AND APPARATUS FOR SYNCHRONIZING THE OPERATION OF TRUNK SCANNERS  
In a system having a pair of trunk scanners which are operated in synchronism to provide redundancy in case of failures, with one trunk scanner being "on line" and the other being "on standby,"...
3763321 TRUNK CIRCUITS FOR ELECTRONIC TELEPHONE SYSTEMS  
Various telephone trunk circuits and their functions are described for an electronic telephone system for providing interface circuits for trunk lines connected thereto. The trunk circuits include...
3761638 PROCESS AND DEVICE FOR IDENTIFYING CONNECTIONS IN A SWITCHING NETWORK  
A process and apparatus for identifying connections between input lines and output lines in a switching network having current sources associated with each output line to feed a connection path...
3748390 PATH FINDING SYSTEM FOR LARGE SWITCHING NETWORKS  
A path finding system for effecting selection and interconnection of electrical circuits through a network of switching matrices interconnected by links to provide plural paths between opposite...
3745259 PATH SELECTION CIRCUIT FOR AN END MARKED NETWORK  
A switching system is disclosed having an end marked network together with facilities for selecting any one out of a plurality of possible network paths for use on a connection between a...
3737587 TELEPHONE SWITCHING SYSTEM HAVING CALL PICKUP SERVICE  
A wired logic electronically controlled switching system is disclosed having subscriber stations divided into a plurality of groups together with facilities whereby any subscriber may dial a...
3729594 LINE AND LINK SENSING TECHNIQUE FOR PABX TELEPHONE SYSTEM  
A technique for detecting the busy or idle status of lines, links and peripheral equipment in an electronic private branch telephone system. Each crosspoint in the system includes an extra contact...
3729593 PATH FINDING SYSTEM  
A path finding system for effecting selection and interconnection of electrical devices through a network of switching matrices providing plural paths between each input and each output thereof...
3729591 PATH FINDING SYSTEM FOR A MULTI-STAGE SWITCHING NETWORK  
A path finding system for effecting selection and interconnection of electrical circuits through a network of switching matrices interconnected by links to provide plural paths between opposite...
3681537 MARKER FOR COMMUNICATION SWITCHING SYSTEM  
The disclosure relates to a switching network and marker used in a communication switching system. The network comprises a plurality of coordinate matrices with reed relay crosspoint switching...
3678208 MARKER PATH FINDING ARRANGEMENT INCLUDING IMMEDIATE RING  
The disclosure relates to an arrangement in a marker pathfinding scheme for providing immediate ringing of the called subscriber terminal. The terminating junctors available to a called terminal...
3660600 PATH FINDING SYSTEM FOR MULTI-STAGE SWITCHING MATRIX  
System for obtaining a free path through a multi-stage switching matrix from a marked input to one of a plurality of junctors or trunks at an output of the network wherein scanning is provided at...
3646277 METHOD AND APPARATUS FOR IDENTIFYING PATHS THROUGH A SWITCHING NETWORK  
A telephone system including a switching network wherein memory circuits are provided for each of the links in the switching network to identify and select cross-points for providing connections...
3626108 SYSTEM AND PROCESS FOR CONTROLLING AN AUTOMATIC TELEPHONE EXCHANGE  
System and process for controlling an automatic telephone exchange to effect line/trunk scan, loop analysis and connection between the available networks in response thereto.
3601546 SELECTION OF A TIME MULTIPLEX SHARED REGISTER AND USE OF A COMMON DATA BUFFER IN A COMMUNICATION SWITCHING SYSTEM  
Each register-sender is assigned an individual junctor, an area of memory, and a recurring time slot of a multiplex cycle; and each during its time slot has use of common process control logic...
3599235 ROUTE SELECTING SYSTEM IN A TELEPHONE EXCHANGE  
A telephone switching system, for example a P.A.B.X., has tandem-connected A, B and C switching stages connected between input speech paths and supervisory units of a plurality of different types...
3585310 TELEPHONE SWITCHING SYSTEM  
A telephone switching system is described which has at least one cross-point matrix strip for each link. The matrix strip includes a group of cross-point switches each of which is associated with a...
3585309 CROSSPOINT NETWORK PATH FINDING SYSTEM  
A path finding system for a telephone switching system having a plurality of reed relay matrix stages is described. Different groups of junctors are connected to different matrices of the stage at...
3573384 ELECTRONIC CROSSPOINT SWITCHING ARRAY  
A crosspoint switching array of four-layer semiconductor devices in which complete connection through the array is established by selecting and firing only the minimum number of crosspoints...
3573383 SCANNING ARRANGEMENT IN A TELEPHONE SWITCHING SYSTEM  
In a switching system, a scanning arrangement is provided to interrogate a plurality of links interconnecting a plurality of switching stages of the system for determining their busy and idle...
3560664 APPARATUS FOR MONITORING A PLURALITY OF RELAYS  
A circuit for monitoring the status of a plurality of relays includes a plurality of monitoring devices each having a control winding connected across a contact of a relay being monitored, and...
3560655 TELEPHONE SERVICE REQUEST SCAN AND DIAL PULSE SCAN DEVICE  
Scanning circuit arrangement for scanning test terminals respectively connected to subscriber's lines and disposed along rows and columns in a matrix, the purpose of which is to detect by means of...
3551603 SWITCHING SYSTEM SCANNING ARRANGEMENT  
3549815 MATRIX CONTROL SELECTION SYSTEM  
3542960 SYSTEM FOR SELECTING A FREE PATH THROUGH A MULTI-STAGE SWITCHING MATRIX HAVING A PLURALITY OF PATHS BETWEEN EACH INPUT AND EACH OUTPUT THEREOF  
3532829 PRIORITY TRAFFIC CONTROL APPARATUS FOR PREFERENTIAL ACCESS TO COMMON CONTROL EQUIPMENT  
3513263 PRIVATE BRANCH TELEPHONE SWITCHING SYSTEM  
3499123 GROUP SELECTING ARRANGEMENT FOR AUTOMATIC TELEPHONE SYSTEMS USING CROSSPOINT RELAY MATRIX SWITCHES  
3493689 SWITCHING MATRIX AND CONTROL SYSTEM FOR TELEPHONE EXCHANGE INSTALLATION  
3487173 SMALL EXCHANGE STORED PROGRAM SWITCHING SYSTEM  
3487170 UNIVERSAL JUNCTOR  
3485956 PATH-FINDING SYSTEM FOR A NETWORK OF CROSS-POINT SWITCHING MATRICES  
3385932 Selection system for electrical circuits having memory block means  
3349189 Communication switching marker having continuity testing and path controlling arrangement  
3336443 Pilot network selection systems  
3336442 Trunk switching circuitry  
3324249 Series pathfinding and setting via same conductor in tandem crosspoint switching netwrk  
3242265 Telephone system with electronic selection  
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