Shenzhen JHA Technology Co., Ltd is one of the leading manufacturers of hardened Ethernet, PoE, and fiber connectivity products specifically designed for harsh and demanding environments.





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

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

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

​When the link is initialized, the auto-negotiation protocol sends a 16-bit message to the peer device and receives a similar message from the peer device. The content of auto-negotiation mainly includes speed, duplex, flow control, etc. On the one hand, it informs the peer device of its own working mode, and on the other hand, it obtains the working mode of the peer device from the message sent by the peer device. For example, the industrial switches of Feichang Technology are all adaptive 10/100/1000M transmission rate, no matter what kind of network card is connected, it can be used normally.