The LCN-LK plastic fiber optic cable is designed for use with the LCN-LLK coupling modules. The LCN-LLK plastic fiber optic coupler is used to connect spatially separated individual LCN buses within an LCN segment. The range is max. 100m when using our LCN-LK cable. The LCN-LLK is used to connect individual rental, supply and building areas so that all LCN bus modules can communicate with each other.