Some Focusrite interfaces feature ADAT inputs and outputs. ADAT is a digital format carried using optical (sometimes referred to as "TOSLink") cables.
The number of channels transferred between two devices over a single ADAT cable depends on the sample rate being used, please see the table below:
| Sample Rate(s) | ADAT Channel Count |
| 44.1kHz and 48kHz | 8 Channels |
| 88kHz and 96kHz | 4 Channels |
| 176.4kHz and 192kHz | 2 Channels |
Audio signal transmitted via ADAT can only travel in one direction down a single cable. If you want to send audio signals in two directions using ADAT you will need two cables and both devices need ADAT In and Out ports.