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Class 370 - Multiplex communications

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394 Subclasses


Subclasses list

Definition

A. This is the generic class for multiplexing or duplexing systems, methods, or apparatus.

(1) Note. Multiplexing includes for example, time division multiplexing (TDM) frequency division multiplexing (FDM), orthogonal and quasiorthogonal multiplexing techniques, phantom connections and plural channel adaptive systems. (2) Note. Selective or telemetering systems which may be analogous to multiplexing techniques are not classified here but elsewhere. (See References to Other Classes, below.) (3) Note. The distinction between multiplexing and selective or telemetry is: in multiplexing, the information is unrestricted as to content, e.g., a teletype-writer which uses an alphabet to transmit unlimited information, whereas in selective or telemetry devices, the information is restricted as to content, e.g., a transducer measuring a single parameter. B. This class includes elements and circuits forming subcombinations having a utility unique to multiplexing such as rotary distributors used as multiplexers, synchronizers used to control distribution of multiplexed channels, bridge duplex circuits, resonant circuits having a special utility in a frequency division multiplexing system. (1) Note. Multiplex modulators, per se, are not classified in this class. See classification elsewhere. (See References to Other Classes, below.)

Lines with other classes and within this class

A. Electrical circuits which may be used in multiplexing systems but are not unique to multiplex communications are classified in the appropriate class for such circuits. (See References to Other Classes, below.)

B. Significantly claimed multiplex techniques in combination with the subject matter of Class 178, Telegraphy, Class 375, Pulse or Digital Communications, Class 379, Telephonic Communications, or Class 455 Telecommunications are classified in Class 370, Multiplex Communications.

C Significantly claimed apparatus external to this class, claimed in combination with apparatus under the class definition, which perform multiplexing operations, are classified in the class appropriate to the external device. (see paragraph B above). (See References to Other Classes, below for examples.)

D Nominally claimed apparatus external to this class in combination with apparatus under the class definition, is classified in this class unless provided for in the appropriate external class. For example, a nominally recited coupled network which includes significant multiplexing operations is classified herein.

E. Multiplexing systems and related devices found in other classes, for which see below

 
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