Optical Connections on 2006 CLK--US

[wsscott]

I've got the following optical fibre connections and I'd like to know what they're used for, if anyone knows. They're labled as follows: SDS IN; SDS OUT; TEL In; SOUND/Out. I"ve been trying to activate a VCM module, and don't know what the wiring of the cables should be. Does anyone have a listing of each of the cables in this model that shows what they're for and how they should connect in the MOST ring? Thanks.