MAN CWDM ring network construction to protect network data storage backup backup backup backup transport channel CWDM coarse wavelength division multiplexing system (2U + 1U) 2U rackmount CWDM equipment using flexible and scalable architecture that supports modular online upgrade, easy expansion and maintenance. At the same time support the band, band network management, flexible management, rich equipment business interface, flexible configuration, network economics, reliable operation. Features equipment capacity: currently using single-mode fiber transmission, CWDM single-channel rates up to 10G, with a total capacity of up to 160G networking equipment and flexible: you can form point to point, multipoint, chain, ring, etc. network topology. Flexible and transparent access to multiple services: support for Ethernet, PDH, SDH, CATV and private network and other services; multi-rate specifications: Support 155M, 1.25G, 2.5G, 4G, 10G various rates. Transmission distance: 10km ~ 120km distance without repeaters and other distance; support relay, to achieve long distance transmission. Good scalability: CWDM biggest wave can be expanded to 18, can be smoothly upgraded to DWDM 1 + 1 multiplex section protection: optical switching time ≤30ms, ensure safe and reliable line. Open architecture: with multi-vendor equipment interconnection, interoperability, support for client devices for single and multi-mode, power port is optional. Powerful network management functions: support SNMP-based network management, and support CLI, WEB, TELNET, etc. NMS 1 + 1 hot backup power supply: The device offers dual power 1 + 1 hot backup, hot-swappable power supply, AC and DC options.