US PATENT SUBCLASS 379 / 93.34
.~.~.~.~.~ Having recognition and selection

Current as of: June, 1999
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379 /   HD   TELEPHONIC COMMUNICATIONS

90.01  DF  TELEPHONE LINE OR SYSTEM COMBINED WITH DIVERSE ELECTRICAL SYSTEM OR SIGNALLING (E.G., COMPOSITE) {8}
93.01  DF  .~ Having transmission of a digital message signal over a telephone line {9}
93.26  DF  .~.~ By voice frequency signal (e.g., tone code) {3}
93.28  DF  .~.~.~ Modulated audio tone {4}
93.31  DF  .~.~.~.~ Protocol {3}
93.34.~.~.~.~.~ Having recognition and selection

DEFINITION

Classification: 379/93.34

Having recognition and selection:

(under subclass 93.31) Subject matter including determination of one of a plurality of modulator-demodulator types and for connecting to a compatible type.