Like single-sideband transmission, the residual sideband method serves to make more efficient use of the available frequency range. With this method, low transmission frequencies are transmitted more efficiently than with pure single-sideband modulation, since the lower frequencies are only transmitted with a high degree of attenuation.
The ATSC has specified vestigial sideband(VSB) for digital terrestrial broadcasting ( DVB-T), namely version 8-VSB. This method uses eight phases, which are encoded with three bits and finally reduced to two bits. The resulting payloaddata rate is 19.28 Mbit/s for a 6 MHz frequency band.
Vestigial sideband is also used in optical networks with wavelength division multiplexing(WDM) for better utilization of wavelengths.