Stromberg-carlson Corporation

Thomas E Ellis

Pedro A Lenk

Barrie Brightman

Jayantkumar R Shah

John W Woodward

William H Stewart

James E Jones

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 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 central office telephone switching system including two interactive processors, including a call control processor that controls calls by establishing sequences of call progression states, and a port event processor that controls the ports and transmits and receives supervisory information to and from the ports. The port event processor and call control processor communicate through a port data store. The port event processor transfers the received supervisory information to the port data store, for use by the call control processor. The port event processor includes a digital filter that periodically time-samples the received supervisory information and determines the proper state of the received supervisory signal based on the states of the majority of the received sample signals.

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Altamonte Springs, FL, United States of America

Thomas E Ellis