STN6200B-SR2 (short for SR2) is an automatic optical router / device protection device (1x 2 automatic optical switch). By monitoring the optical power status of the active / standby route （device） in real time.

The switching control and management control of SR2-2 are independent with each other. Switching function is priority guaranteed, the switching delay is less than 15ms. SR2-2 support transparent transmission, it is widely used in PDH...