Optical Transmitter
WARNING: This page does not describe the selected car, but rather 59 other vehicles, including the 2009 BMW M5, 2009 BMW 650i, 2009 BMW 550i, 2008 BMW M5, and 2008 BMW 760Li. However, it is still accessible from the selected car via links, so may be relevant.
A driver is fitted in the transmitter. The driver energizes an LED (light-emitting diode).
The LED transmits light signals on the MOST bus (650 Nm light, i.e. red visible light). The repeat frequency is 44.1 MHz.
The sensing frequency on a CD player and for audio is 44.1 MHz; this means than no additional buffer is required, yet another reason why this bus system is so efficient for multi-media.