ASW-201/202 series optical switch has an extremely low insertion loss. The main component is imported single-mode optical switch, and adopts MCU intelligent control technology and SMNP network management technology to make the performance better than others. It can work on 3 modes, 2X1 / 1X2 / 2X2 switch options to chose from. I9” standard chassis is adopted, it can be set automatically, manually and by network management. Random optical power and the chosen state are displayed on the front panel LCD or monitored by network management system. It is applicable to switch of optical path and optical devices which need high reliable operation, such as the 1550nm optical transmitter in front of Cable TV, automatic switch of optical fiber amplifier hot backup, optical routing about key protected optical path, ring net with self healing. It can also be used to dynamically configured CADM and OXC, system monitoring and fault protection. Switching power supply is draw-out type with structure of aluminum profile extrusion, it helps greatly to cooling and replacement. Besides it can make dual supply cold-heat backup.