Let me first talk about my own understanding, PoE switches, can supply power to PoE devices through network cables, that is, the equipment that originally needed the network, now does not need to be plugged in, directly, PoE switches transmit power to him through network cables, such as: cameras
Normally, the camera needs to be plugged into the network cable and power adapter, now with PoE devices, if the camera supports PoE function, the camera does not need a power adapter! !
Power over Ethernet refers to the ability to provide 48V DC power over the same copper Ethernet cable. Implementing Power over Ethernet requires two main devices – power supply equipment (PSE), which is a LAN switch or source power supply over Ethernet, and power-up equipment (PD), which is an end device that receives and uses power from an Ethernet cable to operate.
Benefits of PoE: In addition to providing universal power support for connected devices from Ethernet cables, PoE reduces investment expenses, thereby reducing the total deployment cost of consolidating powered devices in a unified IP infrastructure. PoE eliminates the need to install a wall power connection for end devices, reducing the cost of power outlets associated with supporting end devices. It also provides greater flexibility by installing network-connected devices where it is difficult to deploy local AC power.
PoE switches: The ports of PoE switches can provide DC power to some IP-based terminals (wireless access point APs, VoIP phones, and IP-based surveillance cameras) while transmitting data signals. A single standard CAT5 cable can be used to power wireless APs and IP cameras. Power over Ethernet (PoE) optimizes the installation and power management of power devices, reducing installation time and cost for many new network devices.
PoE: PoE (Power over Ethernet) is a local area network technology that provides DC power to powered devices through twisted pair cables, and is currently widely used in enterprise and industrial applications.
PSE: Power Sourcing Equipment, PSE equipment is the device that supplies power to Ethernet client devices, and is also the manager of the entire PoE Ethernet power supply process.
PD: Power Device, PD device is the PSE load that receives power, that is, the client device of the POE system, such as IP phones, network security cameras, APs, and many other Ethernet devices such as handheld computers (PDAs) or mobile phone chargers (in fact, any device with a power of no more than 13W can get the corresponding power from the RJ45 socket).
IEEE 802.3af: This standard specifies that power supply equipment can be powered by Ethernet to a powered device with a power of less than 13W. This is enough for traditional IP phones and webcams, but with the emergence of high-power applications such as dual-band access, video telephony, PTZ video surveillance systems, etc., the power supply power of 13W obviously cannot meet the demand, so IEEE began to develop a new PoE standard 802.3at (PoE Plus) in 2005 to improve the power that PoE can transmit.
IEEE 802.3at:IEEE802.3at (25.5W) was born in response to the needs of high-power terminals, and on the basis of being compatible with 802.3af, it provides greater power supply requirements to meet new needs.
Mid-span: Use the idle wire pairs that are not used in the Ethernet cable to transmit DC power, 4 or 5 pins are connected as positive poles, 7 and 8 pins are connected as negative electrodes, applied to ordinary switches and network terminal equipment, power can be supplied to network terminal devices through network cables, Midspan PSE (midspan power supply equipment) is a special power management device, usually placed with the switch. It corresponds to two RJ45 jacks on each port, one with a short wire to the switch and the other to a remote device.
End-Span method: It is the simultaneous transmission of DC power on the core wire used to transmit data, and its transmission uses a different frequency than the Ethernet data signal. The corresponding Endpoint PSE (End of Line Power Supply Device) has an Ethernet switch, router, hub, or other network switching device that supports POE function. End-Span is expected to be rapidly promoted due to the use of a common line pair for Ethernet data and transmission, eliminating the need for a dedicated line for independent transmission, which is particularly important for only 8-conductor cables and matching standard RJ-45 sockets.
POE (Power Over Ethernet) refers to a technology that can provide DC power to some IP-based terminals (such as IP phones, wireless LAN access point APs, network cameras, etc.) while transmitting data signals without any changes to the existing Ethernet Cat.5 cabling infrastructure. POE technology minimizes costs by securing existing structured cabling while keeping existing networks functioning.
A complete POE system includes two parts: Power Sourcing Equipment (PSE) and Powered Device (PD). PSE devices are the devices that power Ethernet client devices and are the stewards of the entire POE Power over Ethernet process. PD devices are PSE loads that receive power, i.e. client devices of POE systems, such as IP phones, network security cameras, APs, and many other Ethernet devices such as handheld computers (PDAs) or mobile phone chargers (in fact, any device with a power of up to 13W can draw power from an RJ45 socket). Based on the IEEE 802.3af standard, the two establish information about the connection status, device type, power consumption level and other aspects of the PD of the powered device, and use this as a basis to supply power to the PD through Ethernet according to PSE.
The main power supply characteristics parameters of POE standard power supply system are:
1. The voltage is between 44~57V, and the typical value is 48V.
2. The maximum allowable current is 550mA, and the maximum starting current is 500mA.
3. The typical working current is 10~350mA, and the overload detection current is 350~500mA.
4. Under no-load conditions, the maximum current required is 5mA.
5. Provide three levels of electrical power request for PD devices of 3.84~12.95W, with a maximum of no more than 13W. (Note that PD grade 0 and grade 4 are not shown and should not be used.) ）
Hongrui is a professional smart PoE device manufacturer in China, we are committed to creating the most cost-effective and reassuring products for customers to use, which is not an advertisement but a promise to customers. The company's POE series has many types and high reliability, with a power supply distance of 100 meters, and can easily realize network cable power supply. |
Posted on 12/28/2017 4:43:40 PM
|
|
|
|
Posted on 4/29/2018 3:10:44 PM