| 370 / | HD | MULTIPLEX COMMUNICATIONS | 
| 351 | DF | PATHFINDING OR ROUTING {5} | 
| 357 | DF | .~ Through a circuit switch {4} | 
| 360 | DF | .~.~ Switching control {8} | 
| 362 | DF | .~.~.~ Bus switch {2} | 
| 364 |  | .~.~.~.~ Having plural buses {1} | 
| 365 | DF | .~.~.~.~.~> Separate transmit and receive buses |