STN6200B-II: Optical Switching Protection Subsystem The STN6200B-II represents the new generation of high-density optical switching protection subsystems, integrating advanced technology and production processes. Featuring a low power consumption design, it operates at full power consumption levels of less than 90W. The STN6200B-II offers exceptional extensibility with 8 slots, compatible with SR2 and SR2-2 cards.