US PATENT SUBCLASS 379 / 28
.~.~ Of data transmission instrument

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

1  DF  DIAGNOSTIC TESTING, MALFUNCTION INDICATION, OR ELECTRICAL CONDITION MEASUREMENT {12}
27  DF  .~ Of subscriber loop or terminal {4}
28.~.~ Of data transmission instrument

DEFINITION

Classification: 379/28

Of data transmission instrument:

(under subclass 27) Subject matter for testing of a digital signal data terminal connected to a telephone line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

93.01+, transmission of a digital message signal over a telephone line.

SEE OR SEARCH CLASS

375, Pulse or Digital Communications,

224+, for testing a digital transmission instrument not part of a telephone arrangement.