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What is a poe switch? What is poe power supply?
POE is also known as a LAN-based power system or active Ethernet, sometimes referred to as Power over Ethernet, and refers to some of the existing Ethernet Cat.5 cabling infrastructure without any changes. IP-based terminals (such as IP phones, WLAN access points, APs, network cameras, etc.) transmit data signals while also providing DC power for such devices. POE technology can ensure the normal operation of existing networks while reducing the cost while ensuring the security of existing structured cabling.
Market mass application - POE switch: For example, the Tianbo POE switch can provide the power supply function of the other end of the network cable in addition to the transmission function provided by the ordinary switch. Power supply + data transmission integration, no need to add power supply module or POE power supply module to supply power to the equipment, a Cat.5 line to complete all work.
The POE switch is a POE switch designed to reduce network congestion, support long-distance network power, and implement data conversion. It has both basic functions of the switch and POE power supply. Each POE power supply port can provide the maximum power (IEEE 802.3af specification 15.4W, IEEE 802.3at specification 30W), and can supply power to wireless APs, IP cameras, network remote devices, etc. Plug and play, providing low cost and high Performance network solution. The transmission distance can reach 100m, (the non-standard Cat.5 network cable is recommended to be controlled within 70 meters), the installation is simple, plug and play. Ideal for wireless coverage, security monitoring and other environments.
Two power supply methods for POE:
1. Line sequence data feet used by the end-span method of POE power supply: 1/2 (arbitrary polarity), 3/6 (arbitrary polarity) and 4/5 (+), 7/8 (-) Dual power mode.
2, POE power intermediate cross-connect method (Mid-Span) used line sequence idle feet: 4/5 (+), 7/8 (-)
The difference between the use of POE power "standard" and "non-standard"
Standard POE: According to the IEEE802.3af/at specification, it is necessary to first detect the 25K characteristic resistance of the receiving end, perform handshake, and successfully transmit the power (36V~57V); otherwise, only data (data).
For example: plug the POE power supply to the computer network card, it will not burn the computer network card and only can access the Internet because the data can pass.
Non-standard POE: Also called strong supply type, the AC power is supplied when the power is on; the power receiving terminal is not detected first, and the handshake is not performed, and the power is directly supplied (0V~57V).
Example: Plug the POE power supply into the computer network card, you can access the Internet normally, but do not negotiate direct power supply, there is a lower probability that the device network card may be burned.
The market is roughly divided into several output voltages (DC) such as 48V, 24V and 12V.
Note : The biggest difference between the “standard†and “non-standard†of the POE switch is whether it has the handshake detection function. Secondly, the input PO of the standard POE PD (commonly understood by the powered terminal or the power receiving module) must be 36V~57V. In the meantime, the output voltage range is inevitably a non-standard POE power supply switch, but there may be non-standard POE power supply switches in the output voltage of 36V~57V (but no power supply without handshaking), standard POE switches and non-standard The POE switch power supply line sequence is not mandatory. Anything is possible. It depends on what line order is received by the power terminal, and what kind of power line sequence POE switch is purchased.