| 370 / | HD | MULTIPLEX COMMUNICATIONS |
| 464 | DF | COMMUNICATION TECHNIQUES FOR INFORMATION CARRIED IN PLURAL CHANNELS {9} |
| 498 | DF | .~ Combining or distributing information via time channels {17} |
| 503 | ![]() | .~.~ Synchronizing {6} |
| 504 | DF | .~.~.~> Reference indication consists of a gap |
| 505 | DF | .~.~.~> Pulse stuffing or deletion {1} |
| 507 | DF | .~.~.~> Mutual (reciprocal) synchronization {1} |
| 509 | DF | .~.~.~> Using synchronization information contained in a frame {3} |
| 516 | DF | .~.~.~> Adjusting for phase or jitter {1} |
| 520 | DF | .~.~.~> Unique synchronization pulse |