Apparatus for ccis data transfer between a cpu and a...

Details Apparatus for ccis data transfer between a cpu and a... Apparatus for ccis data transfer between a cpu and a...

G - Physics

06

F

354/234

G06F 9/46 (2006.01) G06F 11/20 (2006.01) H04Q 3/545 (2006.01)

Patent

CA 1190659

APPARATUS FOR CCIS DATA TRANSFER BETWEEN A CPU AND A PLURALITY OF DATA TERMINAL EQUIPMENT ABSTRACT OF THE DISCLOSURE A single CCIS central processing unit is employed to receive and transmit CCIS data from a central switching office to other CCIS offices via modems, or digital trunk units and Tl spans. This apparatus facilitates orderly and timely data exchange between a CCIS central processing unit and a plurality of data terminal equipment. Every 10 milliseconds the CCIS CPU scans all the data terminal equipment. However, particular data transmissions require inter- action at a more rapid rate. The present invention provides for a high priority data transmission from the terminal equipment to the central processing unit intermingled with regular priority messages.

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