STN6800-II is a 10G/100G OTN transport system, it is mainly used in metropolitan area for convergence and access, as well as data center interconnected transmissions. It supports electronic cross between cards, multi service particle scheduling and 10G/100G transmission, with rich management and protection functions. STN6800-II has 2 slots for service board (service board supports 1+1 backup for cross board protection and control), 4 slots for WDM/EDFA board, 2 slots for power supply (dual-DC, dual-AC, or AC plus DC for optional), which improves the reliability and stability of system.