General Electric Company

Standard Telephones & Cables Limited

The Plessey Company Plc

The Post Office

Anthony E Shuttleworth

Alexander S Philip

Frederick H Rees

Michael G Foxton

Stephen Niewiadomski

Graham Howard

Allen Parkinson

A digital switching arrangement for use in a telecommunications exchange handling channels of digital information in time division multiplex form. The digital switching arrangement being particularly suited for use in stored program processor controller environments. The arrangement comprises a digital switching network and a control equipment. The control equipment includes an input queue and an output queue each arranged to store processor input and output messages respectively. The control arrangement is arranged to asynchronously process each output message to process switching network path connections and to generate in the input queue an input message indicative of the actions performed. Each output message includes switching network identification information indicative only of the identities of the incoming and outgoing exchange highways and channels to be involved in the switching network path to be processed.

Digital switching arrangements for stored program control

A digital switching telecommunications exchange handling pulse code modulated information samples in time division multiplex form on incoming and outgoing junctions. The exchange includes a receive interface for each incoming junction and a transmit interface for each outgoing junction and a pair of identical time division multiplex switching networks providing interconnection paths between any incoming junction channel and any outgoing junction channel. Under non-fault conditions exchange calls use indentical paths in each network and the transmit interfaces include error checking and comparison arrangements for each pair of information samples received under fault conditions the transmit interfaces can be arranged to select the non-faulty sample on a per channel basis or can be biased to select one network exclusively.

Digital telecommunication switching systems

A P.C.M. compression-law coder in which sample values in different segments of the dynamic range of the coder are allotted different charging time intervals in an integrator circuit, the segment number forming one part of the resultant encoded signal and digital measure of the discharge time of the integrator circuit at constant current providing another part of the encoded signal.

Electric puke code modulation encoding arrangements

Growing community of inventors

Burbage, United Kingdom

Anthony E Shuttleworth