Gte Automatic Electric Incorporated

Krikor A Krikor

Kuang-Cheng Hu

The present invention is a power zoning arrangement for a common channel interoffice signaling system. For small switching offices a minimal hardware configuration is provided for CCIS data transfer while maintaining a single fault tolerant system.

Single fault tolerant CCIS data link arrangement

This circuit provides a minimally sized data transfer buffer interface between two central processing units for transferring data blocks of variable size. The circuit provides an indication to one CPU that the other CPU has received all the data words transmitted.

Circuit for reliable data transfer between two central processing units

This circuit provides for retrieving common control interoffice signaling (CCIS) data from a PCM voice data stream of a T1 span. T1 spans interconnect switching offices. Unused data bits in these T1 spans are encoded with CCIS data and transmitted between the switching systems where the CCIS data is recovered.

Circuitry for recovery of data from certain bit positions of a T1 span

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 T1 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 interaction 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.

Apparatus for CCIS data transfer between a CPU and a plurality of data

An automated switching office arrangement for switching data link transmission from analog to digital data or vice versa is disclosed. Any or all of a number of data links may be automatically switched between the digital and the analog transmission modes. This automated switching may be accomplished locally within the switching office or from a remote location.

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Glendale, AZ, United States of America

Krikor A Krikor