A worldwide, switched, secure voice network developed to fulfill DOD long-haul, secure voice requirements. [JP1]

An organization of stations capable of intercommunications, but not necessarily on the same channel. [JP 1-02]

A communications network that uses a combination of line facilities, i.e., trunks, loops, or links, some of which use only analog or quasi-analog signals and some of which use only digital signals. Synonyms hybrid network, hybrid system.