NASA NTRS · 19730000226
A closed, digital telephone system
Abstract
Digital system can accommodate sixteen or more telephone or data units and eight, simultaneous two-way conversations through only four interconnecting wires. It uses fewer circuit components, is not bulky or complex, and requires no central exchange control.
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Monford, L. G., Jr.. 1973-08-01. A closed, digital telephone system. https://ntrs.nasa.gov/citations/19730000226
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