aopre Ober fiber optic transceiver ring network switch Gigabit 2 Optical 4 electrical fiber transceiver single-mode single-fiber photoelectric converter plug and play series ring network fiber switch transceiver
2 Optical 4 electric ring network single fiber A B 3km 2 Optical 4 electric ring network single fiber A B 20km 2 Optical 4 electric ring network Double Fiber