US PATENT SUBCLASS 370 / 273
QUADRUPLEX

Current as of: June, 1999
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370 /   HD   MULTIPLEX COMMUNICATIONS

273QUADRUPLEX {2}
274  DF  .~> Repeater
275  DF  .~> Duplex diplex

DEFINITION

Classification: 370/273

QUADRUPLEX:

(under the class definition) Subject matter for the simultaneous transmission of four messages, two in each direction over the same transmission medium.

SEE OR SEARCH THIS CLASS, SUBCLASS:

272, for a sextuplex system.

276, for a duplex system.

297, for a diplex system.

SEE OR SEARCH CLASS

178, Telegraphy,

66.1, for simplex transmission with pulsating currents.