The MTI-63 Ed.2 Fiber Optic Transmission Module is used to connect nodes in the POLON 6000 system via fiber optic cables The MTI-63 Ed.2 module consists of two MTI-63 modules in a single housing and can be installed on a dedicated 35mm DIN rail located on the MZ-60-xxx power supply or behind the top mounting rail of SM-60 modules.