US PATENT SUBCLASS 379 / 242
CENTRALIZED SWITCHING SYSTEM

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

242CENTRALIZED SWITCHING SYSTEM {15}
243  DF  .~> Class of service determination or transmission {1}
245  DF  .~> Identification {1}
250  DF  .~> Four-wire switching
251  DF  .~> With generating of call associated substation signal {3}
258  DF  .~> Switching controlled in response to called station addressing signal {9}
308  DF  .~> Switching apparatus for connecting calling line to operator's position {1}
310  DF  .~> Divided central (e.g., communication between switchboards) {1}
312  DF  .~> Having multiple answering jacks for multiplied line
313  DF  .~> Multiple section switchboard {1}
315  DF  .~> With line-signal control {3}
319  DF  .~> Single switchboard (e.g., cord circuit) {1}
322  DF  .~> Power supply {2}
325  DF  .~> Structure of equipment {3}
331  DF  .~> Having protective circuit
332  DF  .~> Plug and socket

DEFINITION

Classification: 379/242

CENTRALIZED SWITCHING SYSTEM:

(under the class definition) Subject matter which selectively connects two telephone subscriber lines for communication.

(1) Note. This subclass includes a single telephone office and generic telephone switching.

SEE OR SEARCH THIS CLASS, SUBCLASS:

219+, for a plural exchange network.

SEE OR SEARCH CLASS

711, Electrical Computers and Digital Processing Systems: Memory,

1+, for addressing combined with specific memory configurations (e.g., extended, expanded, dynamic, etc.) in a digital data processing system, subclasses 100+ for generalized address forming in a digital data processing system, and subclasses 200+ for generalized storage accessing and control in a digital data processing system.