On This Day in Telephone History October 23RD 1971 ATT Announced Data Under Voice (DUV), a technological development which permitted data signals to “hitchhike” on existing microwave radio systems by using the lower end of the frequency band not normally used by voice channels.

On This Day in Telephone History October 23RD 1971

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On This Day in Telephone History October 23RD 1971 ATT Announced Data Under Voice (DUV), a technological development which permitted data signals to “hitchhike” on existing microwave radio systems by using the lower end of the frequency band not normally used by voice channels.