US PATENT SUBCLASS 359 / 123
.~.~ Time and frequency division

Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

109  DF  OPTICAL COMMUNICATION {13}
115  DF  .~ Multiplex {7}
123.~.~ Time and frequency division

DEFINITION

Classification: 359/123

Time and frequency division:

(under subclass 115) Subject matter wherein information is transmitted on different segments of a transmission medium, which segments are divided based upon the frequency spectrum and discrete time intervals.

SEE OR SEARCH THIS CLASS, SUBCLASS:

124, for frequency division multiplexing only.

135, for time division multiplexing only.

SEE OR SEARCH CLASS

370, Multiplex Communications, appropriate subclasses, particularly

330, and 436 for combined time and frequency channels assignments in wireless or wired multiplex communications, and subclass 478 for combined time and frequency division multiplexing.

385, Optical Waveguides, 31+, for the combination of a waveguide and an input/output coupler not included in an optical communications system.