US PATENT SUBCLASS 379 / 399
SUBSCRIBER LINE OR TRANSMISSION LINE INTERFACE

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

399SUBSCRIBER LINE OR TRANSMISSION LINE INTERFACE {5}
400  DF  .~> For line length compensation {1}
402  DF  .~> Hybrid circuit {2}
406  DF  .~> Echo suppression, antisinging, or reverse path blocking {4}
412  DF  .~> Protective circuit
413  DF  .~> Power supply (e.g., battery feed)

DEFINITION

Classification: 379/399

SUBSCRIBER LINE OR TRANSMISSION LINE INTERFACE:

(under the class definition) Subject matter including a circuit for connecting a telephone communications line to a central switching office or a subscriber station.

SEE OR SEARCH THIS CLASS, SUBCLASS:

27+, for diagnostic testing of a subscriber loop.

219+, for interconnection of plural exchanges.

377+, for line signalling using line or loop condition detection.

387+, for substation circuitry.

398, for line equalization or impedance matching. 414+, for transmission line characteristic control.

SEE OR SEARCH CLASS

333, Wave Transmission Lines and Networks, appropriate subclasses for a passive connection between a transmission line and another device.