US PATENT SUBCLASS 370 / 452
.~.~.~.~ On ring or loop

Current as of: June, 1999
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370 /   HD   MULTIPLEX COMMUNICATIONS

431  DF  CHANNEL ASSIGNMENT TECHNIQUES {12}
449  DF  .~ Polling {1}
450  DF  .~.~ Passing a signal identifying the idle or busy state of a channel (e.g., token passing) {2}
451  DF  .~.~.~ On bus {1}
452.~.~.~.~ On ring or loop {4}
453  DF  .~.~.~.~.~> Initialization or reinitialization of network
454  DF  .~.~.~.~.~> Having multiple idle or busy signals simultaneously on the network
455  DF  .~.~.~.~.~> Including priority resolution
456  DF  .~.~.~.~.~> Idle or busy signal erasure or frame erasure

DEFINITION

Classification: 370/452

On ring or loop:

(under subclass 451) Subject matter in which the idle or busy signal is passed from station to station on a closed transmission path.

(1) Note. Token passing buses are normally implemented by the creation of a logical loop or ring using a token passing list which contains the order of which token is to be passed.