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IPC Subgroup
H04L 27/28

with simultaneous transmission of different frequencies each representing one code element

Introduced: September 1968

Last revised: January 2006

Full Title

Modulated-carrier systems > Systems using multi-frequency codes > with simultaneous transmission of different frequencies each representing one code element

Classification Context

Section:
ELECTRICITY
Class:
ELECTRIC COMMUNICATION TECHNIQUE
Subclass:
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION