COMMUNICATIONS CONVERTER FOR CONTROL CABLE FOR SYNCHRONOUS DATA END UNITS OPTICAL <-> ELECTRONIC (PILOT WIRE) CONVERTER TO SERIAL COUPLING OF SIPROTEC 4 PROTECTION RELAYS 7SD52/7SD610/7SA52/7SA61 TO 2 CORE PILOT WIRE CABLE UP TO 10 KM CONNECT. OPTICAL 820NM/ST-PLUG ON 62,5/125MU- METER MULTIMODE FIBER UP TO 1.5KM TO THE PROTECTION DEVICE ELECTRICAL WITH SCREW TERMINALS TO THE PILOT WIRE(5KV ISOLATED)