The device uses storage and forwarding, no fan, low power design, with the advantages of easy use, compact size, simple maintenance and so on. The product design meets the standard of ethernet, and adds lightning protection and static protection measures. It has a wide range of working temperature ranging from - 40 C to 85 C. It has stable and reliable performance. It can be widely used in various broadband data transmission fields such as intelligent transportation, telecommunications, security, financial securities, customs, maritime transportation, electric power, water conservancy and oil fields.