When the Lynx Card which is connected to an LS-ADAT is presented with a sample rate higher than 48kHz, either from an external clock source or from it’s own internal clock, it automatically switches to S/MUX mode - the protocol for using high sample rates with ADAT lightpipe devices. In this mode, the number of input and output channels per ADAT port is reduced according to the sample rate being used. One can achieve 4 channels per port at 88.2/96kHz, and 2 channels per port at 176/192kHz.

It is important to understand the impact that this has on how audio is routed through the system. The chart below details the channel assignments at high sample rates: