With good quality ,high sensitivity optical receiving PHILIPS module(R) or PIN photodetector (R-A) and low power loss return amplifier module; 1310nm or 1550nm operation, suitable for all kinds of optical transmission system; Bandwidth: 5～200MHz, suitable for all kinds of system; It can be equipped four individual optical return receiving modules at most; With attenuator and equalizer; Good performance switching power supply can normally work when input voltage is in AC110～250V; LED on the front board indicates receiving optical power; 19″standard case, easy to install.