US PATENT SUBCLASS 379 / 219
PLURAL EXCHANGE NETWORK OR INTERCONNECTION

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

219PLURAL EXCHANGE NETWORK OR INTERCONNECTION {6}
220  DF  .~> With interexchange network routing {1}
222  DF  .~> Toll center {1}
224  DF  .~> Tandem switching center
225  DF  .~> Multi-PBX interconnection
226  DF  .~> Having a manual exchange {1}
229  DF  .~> Interexchange signalling {6}

DEFINITION

Classification: 379/219

PLURAL EXCHANGE NETWORK OR INTERCONNECTION:

(under the class definition) Subject matter including a system having more than one exchange (e.g, switching office), or a circuit connection therebetween.

(1) Note. A branch exchange (e.g., PBX, PABX, etc.) is

considered to be a separate switching office for purposes of this and its indented subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

242, for single exchange and generic centralized switching.