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A closed, digital telephone systemDigital 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.
Document ID
19730000226
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Monford, L. G., Jr.
Date Acquired
August 7, 2013
Publication Date
August 1, 1973
Subject Category
Electronic Systems
Report/Patent Number
MSC-13912
Report Number: MSC-13912
Accession Number
73B10226
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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