| 370 / | HD | MULTIPLEX COMMUNICATIONS |
| 351 | DF | PATHFINDING OR ROUTING {5} |
| 389 | DF | .~ Switching a message which includes an address header {11} |
| 395 | ![]() | .~.~ Message transmitted using regularly occurring fixed length time intervals (e.g., ATM) {2} |
| 396 | DF | .~.~.~> Distributed switching {1} |
| 398 | DF | .~.~.~> Centralized switching {1} |