groups: 12 4000 Hz voice channels (3000Hz + 2 500hz guard bands) multiplexed into 60 - 108kHz band
supergroups: 5 groups multiplexed together (60 voice channels)
mastergroups: 10 supergroups multiplexed together (Bell System) (600 voice channels)
and keeps on going: microwave multiplexes 1000's of calls together
| Previous slide | Next slide | Back to first slide | View graphic version |