Combined analog/digital CCIS data transmitter/receiver circuit
AssigneeGTE Communication Systems Corporation
InventorJoseph A. Conforti
Life of this patent
Estimating the term…
Abstract
Common channel interoffice data transfer circuitry is shown for transmitting and receiving both analog and digital CCIS data. This data transfer circuitry is a data terminal equipment control circuit. The terminal equipment control circuit is microprocessor controlled. The terminal equipment control circuit is adaptable to transfer CCIS data to analog interfaces, such as modems. The circuit is also adaptable to transfer CCIS data to and from digital data sources, such as digital trunks or T1 spans. The design of this circuit possesses a high degree of commonality and, therefore, requires a minimal amount of components.
Claims18
In a CCIS system, a plurality of terminal equipment control circuit for transmitting and receiving CCIS data words in analog and digital form, each said terminal equipment control circuit connected between a CCIS system CPU and digital and analog terminal equipment, each said terminal equipment control circuit comprising:
- CPU means;
- clock means;
- bus means for transferring said CCIS data words;
- bus control means connected between said CPU means and said bus means, said bus control means being operated in response to said CPU means to control the transfer of said CCIS data words to and from said CPU means;
- mode control means connected to said bus means and being operated in response to said CPU means to store a plurality of indicators, including a receive or transmit mode indicator and an analog or digital mode indicator;
- receiving means connected to said clock means, to said mode control means, to said terminal equipment and to said CPU means via said bus means, said receiving being operated in response to said clock means to transfer said CCIS data words from said connected analog and digital terminal equipment to said CPU means;
- and
- transmitting means connected to said CPU means via said bus means, to said clock means, to said mode control means and to said terminal equipment, said transmitting means being operated in response to said clock means to transfer said CCIS data words from said CPU means to said analog and to said digital terminal equipment.
Dependencies are inferred from the claim text.