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Two power supply methods for PoE switches:
1. The intermediate crossover method refers to the use of free wire pairs that are not used in Ethernet cables to transmit DC power.
2. The terminal crossover method means that DC power is transmitted at the same time on the core wire used for data transmission. The power transmission adopts a frequency different from that of the Ethernet data signal, eliminating the need to set dedicated lines for independent power transmission. The 8-core cable and the matching standard RJ-45 socket are particularly important.
PoE switches can provide DC power for such devices while transmitting data signals for some IP-based terminals (IP phones, wireless LAN access points APs, network cameras, etc.). In fact, the IEEE 802.3at-compliant switch can achieve a port output power of 15-60 W. In general, a PoE-powered switch is a switch that supports network-powered switches. It can not only implement the data transmission function of a common switch but also perform network terminal operations simultaneously. powered by. Use PoE technology to ensure the safety of existing structured cabling while ensuring the normal operation of existing networks, minimizing costs.