multiplex hierarchy
Telecommunications
In frequency-division multiplexing, the rank of frequency bands occupied:
| 12 channels | group |
| 5 groups (60 channels) | super group |
| 5 super groups (300 channels) | master group (CCITT--now, ITU-T) |
| 10 super groups (600 channels) | master group (U.S. standard) |
| 6 U.S. master groups (3600 channels) | jumbo group |