Stromberg-carlson Corporation

Barrie Brightman

Pedro A Lenk

William H Stewart

Frank Niertit

Jayantkumar R Shah

John W Woodward

Thomas E Ellis

James E Jones

George D Elliott

Haresh C Jotwani

Ernest O Lee

George C Hanson

Joseph A Hartman

Nickoline P Mealo

Otto W Beebe

Richard I Subrin

Rick L Mantz

A telephone switching system for telephone trunk and subscriber lines that carry voice and associated supervisory information signals. The voice signals are received through one of a plurality of ports under the control of a port event processor, and are transferred through a switching arrangement under the control of a call processor for transmission through a second port. The supervisory information is received with the associated voice signals, and is sampled and stored in a port data store memory. The call processor can retrieve or modify the supervisory information stored in the port data memory store, and can store control information in the port data store. The port event processor enables the transfer of certain supervisory information from the port data store for transmission with the associated voice signals to the respective port. The port event processor also performs certain operations specified by the commands and supervisory information stored in the port data store memory. The port event processor and port data store memory both operate under control of timing signals from a timing signal generator. The timing generator generates timing signals of two frequencies. The port data store memory samples the sense supervisory information signals at a rate dependent upon the higher frequency timing signal, and the port event processor controls the operation of the respective ports in response to the lower frequency timing signal.

Sampled port data switching system employing interactive processors

A bilateral, low loss, wide band, switching circuit controls the transfer of a signal between two terminals. The balance points of a bilateral current gate connect to the terminals. A rectifier forward-biases the bilateral current gate when a controllable switching element forms a return path from the bilateral current gate to the rectifier. When the rectifier is energized, control circuitry closes the conductive path through the switching element to forward-bias diodes in the bilateral current gate so it operates as a modulator in which the signal to be switched is modulated onto the bias current from the rectifier.

Bilateral electronic switch

A common control for a community office (C.O.) switching system includes two interactive processors. One of these interactive processors is a call control processor which comprises the uppermost element in the control hierarchy. It is a stored program processor and its functions include: (i) control of call progression, (ii) marking paths through the matrix switch network, and translations. The other of these interactive processors is a port event processor. It is a construction of electronic logic circuitry known as 'combinatorial logic'. The port event processor operates on the principle of the combinatorial logic being sequentially coupled to every one of the port equipment positions over a 4 millisecond scan cycle. A pair of functional units of the port event processor provide the common control capability to sense or transmit supervisory events. These function units also interact with the call control processor in a way which permits the latter to function as the uppermost hierarchical element of the common control with substantially no burden of performing real-time tasks connected with port events. The interaction between the call control processor and the port event processor is effected through a port data store which provides an individual port data field per port equipment position. In general, each port data field is accessible to either of the interactive processors.

Arrangement of interactive processors for control of ports

A telephone switching system for telephone lines in a telephone network that carry voice and associated supervisory information signals. The voice signals are received through one of a plurality of ports under the control of a port event processor and are transferred through a switching arrangement, under the control of a call processor, and transmitted through a port again under the control of the port event processor. The received supervisory information is stored in a port data store memory, which also stores call state and command information. The port event processor retrieves the stored supervisory information and commands from the port data store memory, and processes the supervisory information in response to the commands in at least two functional units, and returns processed information for storage in the port data store memory.

Arrangement of interactive telephone switching processors providing

A line circuit for connecting a subscriber line to a telephony system that avoids the use of electro-mechanical elements such as relays. A bridge circuit includes a bilateral current gate in each of the tip and ring lines that can couple or inhibit signals from passing between the subscribed lines and the system. When the bilateral current gates are in an inhibit mode, an on-hook current source energizes the tip and ring lines. A detector senses when the subscriber goes off-hook, and also the dial pulses. After the current gate goes into a coupling mode, the on-hook current source and detector are electrically inactive, and an off-hook current source thereafter provides current to the tip and ring conductors.

All electronic interface for telephony system

A common control for a community office (C.O.) switching system includes two interactive processors. A call control processor comprises the uppermost element in the control hierarchy and is a stored program processor that controls call progression, marks paths through a matrix switch network, and performs other functions. A port event processor constructed of 'combinatorial logic' is sequentially coupled to every port equipment position connected thereto over a four millisecond scan cycle. Interaction between the call control processor and the port event processor is effected through a port data store, which provides an individual port data file per port equipment position. The port event processor also includes timers that respond to call timing information that can be stored in a port data field for controlling the processing of certain signals from the corresponding port equipment position.

Arrangement of interactive telephone switching processors for performing

A bilateral, low loss, wide band, concentrator circuit selectively controls the transfer of a signal between one of a plurality of first terminals and a single, second terminal. The balance points of each of a plurality of bilateral current gates connect to one of the first terminals and to the second terminal. A floating power supply and selection switches selectively forward bias one of the bilateral current gates so it operates as a modulator in which the signal to be switched is modulated onto the bias current thereby to form a low-loss, wide-band path between the selected first terminal and the second terminal.

Concentrator circuit incorporating solid state bilateral bridge

A fault monitoring and diagnostic system for a telephony switching system. Two call processing systems connect through a programmable switch to port group units that receive individual telephone lines. All signals from the port group units are conveyed to both call processing systems, and the call processing systems operate in synchronism. However, the programmable switch conveys signals back to the port group units from only one of the call processing systems. Fault monitoring and diagnostic circuitry monitors various conditions within the telephony switching system. A test call generator automatically performs test calls thereby to diagnose system problems. If a fault is detected, the fault monitoring and diagnostic system controls the programmable switch and, in appropriate circumstances, couples the output signals from the other call processing system to the port group units. Information concerning the nature of the fault is also provided.

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Fern Park, FL, United States of America

Barrie Brightman