(under the class definition) Subject matter in which the diagnostic testing is performed upon a channel of a transmission medium with a device for supplying digital data thereto.
(1) Note. The transmission facility includes the transmission medium and all associated equipment required to transmit a message.
SEE OR SEARCH CLASS
370, Multiplex Communications,
241+, for testing of multiplex communication systems.
375, Pulse or Digital Communications,
224+, for testing of pulse or digital communications system.
379, Telephonic Communications, 1+, for diagnostic testing of telephone equipment.
