Optical star coupler for central operation from siemens protec. equipments v3/v4 w. protection operator routine digsi v3/v4 basic design in subrack 19" single-height with central controller module for connecting on pc or modem over lwl 820nm fsma-plug or sub-d 9pol. bush auxiliary supply 48-250v dc and 110-220v ac without change-over without connection for protection equipments without 9pin 7xv5100-4 cable (accessory)