The Cisco GLC-SX-MMD transceivers are high efficiency, expense effective modules supporting dual data-rate of 1.25 Gbps/1.0625 Gbps and 550m transmission distance with MMF. The transceiver includes 3 areas: a VCSEL laser transmitter, a PIN photodiode integrated with a trans-impedance preamplifier (TIA) and MCU control system. All modules please course I laser safety requirements.-- Website: --Products Link: /-p-22138.html