Among the many performance indicators of industrial switches, we often see the indicator “adaptive”. What does it mean?

Self-adaptation is also called automatic matching and auto-negotiation. After the Ethernet technology has developed to 100M speed, there is a problem of how to be compatible with the original 10M Ethernet equipment. The auto-negotiation technology is formulated to solve this problem.

The auto-negotiation function allows a network device to convey the working mode information it supports to the opposite end on the network and accept the corresponding information that the other party may pass. The auto-negotiation function is completely implemented by the physical layer chip design, so it does not use dedicated data messages or bring any high-level protocol overhead.

When the link is initialized, the auto-negotiation protocol sends 16-bit packets to the peer device and receives similar packets from the peer device. The content of auto-negotiation mainly includes speed, duplex, flow control and so on. On the one hand, it notifies the working method of the peer device itself, and on the other hand, obtains the working method of the peer device from the message sent by the peer. Ru Feichang Technology’s industrial switches are all adaptive 10/100/1000M transmission rate, no matter what kind of network card is connected, they can be used normally.