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} |
457 | .~.~.~ Initialization or reinitialization of network |