Dolby E, Dolby Digital and Dolby Digital Plus digital audio standards can be transported as audio data over an SMPTE 337M AES carrier with a 48kHz sample rate.
These standards can be used to transport mono, stereo, 5.1 and 7.1 audio programmes:
Dolby 5.1 - involves five channels for normal-range speakers (20 Hz - 20,000 Hz) (right front, centre, left front, rear right, rear left) and one channel (20 Hz - 120 Hz allotted audio) for the subwoofer driven low-frequency effects.