What is a POE switch?

What is a poe switch

The so-called poe switch is a switch port that supports output power of up to 15.4 W, complies with the IEEE 802.3af standard, and provides power for standard POE terminal equipment through a network cable, eliminating the need for additional power wiring. After researching and researching and advancing POW exchanges that conforms to IEEE802.3aT standard that Advantech releases, the output power of the port can reach 25-30W. Popular speaking, POE switchboard is the switchboard that supports the power supply of the network cable, it can not only realize the data transmission function of the common switchboard but also can The network terminal supplies power.

POE (Power Over Ethernet) refers to some IP-based terminals (such as IP telephones, wireless LAN access points APs, network cameras, etc.) in the absence of any changes to the existing Ethernet Cat.5 cabling infrastructure. While transmitting data signals, it can also provide DC power supply technology for such devices. POE technology can ensure the normal operation of existing networks while ensuring the safety of existing structured cabling, and minimize costs.

POE is also known as a LAN-based power supply system (POL, PoweroverLAN) or Active Ethernet, sometimes also referred to simply as Power over Ethernet, which is the latest in the use of existing standard Ethernet transmission cables for the simultaneous transmission of data and electrical power. Standard specifications, and maintain compatibility with existing Ethernet systems and users. The IEEE802.3af standard is a new standard for POE based on Power over Ethernet (POE). It adds the relevant standard for direct power supply via the network cable based on IEEE 802.3. It is an extension of the existing Ethernet standard and is also the first one about power distribution. International standards.

The IEEE began to develop this standard in 1999. The earliest vendors involved were 3Com, Intel, PowerDsine, Nortel, Mitel, and National Semiconductor. However, the shortcomings of the standard have always restricted the expansion of the market. Until June of 2003, the IEEE approved the 802.3af standard, which clearly stipulates power detection and control in remote systems, and provides routers, switches, and hubs with Ethernet cables to IP phones, security systems, and wireless LAN access points. The method of power supply for such equipment is stipulated. The development of IEEE802.3af includes the efforts of many company experts, which also makes the standard can be tested in various aspects.

A typical Power over Ethernet system. Keep the Ethernet switch device in the wiring closet and use a power supply hub (Midspan HUB) to provide power to the LAN's twisted pair cable. At the end of the twisted pair, this power is used to drive phones, wireless access points, cameras, and other devices. To avoid power outages, use a UPS.

Poe switch technology

PoE Power over Ethernet Requirements Structured cabling is the foundation of all today's data communications networks. With the development of many new technologies, today's data networks are providing more and more new applications and services: if it is not convenient to route or wire The use of wireless local area network (WLAN) technology can effectively extend existing networks at higher costs. For example, IP-based telephony applications also provide users with more new and enhanced enterprise-level applications. After the 9.11 incident, the global The security market has undergone tremendous changes, directly promoting users to consider deploying as many network security cameras and other network security devices as possible on existing Ethernet networks. At present, such new applications have been increasingly accepted by users and have been rapidly developed. All these devices that support new applications need additional AC power supply devices. In particular, wireless LANs such as APs and IP network cameras are located far away from the central computer room, which increases the cost of the entire network. In order to make it as convenient as possible and minimize costs, the IEEE Institute of Electrical and Electronics Engineers approved a new Power over Ethernet standard IEEE802.3af in June 2003 to ensure that users can use existing structured cabling for this type of new The application device provides power supply capabilities.

The difference between POE switches and ordinary switches

A POE switch is a switch that supports the power supply to the network cable. Compared with a common switch, a power receiving terminal (for example, an AP, a digital camera, etc.) does not need to perform power supply wiring, and has higher reliability for the entire network.

Application of POE Switch in Network Video Surveillance With the continuous high-speed development of China's economy, the market for security protection technology has been fully developed. Various technologies have been applied to safety and security technology facilities, and have played an important role in maintaining public order and ensuring the safety of people's lives and property. Among them, the most widely used and long-term development is the video surveillance system.

Sodium bentonite waterproof blanket- GCL

Part one: Description of GCL waterproof blanket

Geosynthetic clay liners (GCLs) are high performance needle punched environmental reinforced composites which combine two durable Geotextile outer layers with a uniform core of natural sodium bentonite clay to form a hydraulic barrier. Fibers from the non-Woven Geotextile are needle punched through the layer of bentonite and incorporated into the other geotextile (either a woven or non-woven).when hydrated under a confining load, the bentonite swells to form a low permeability clay layer with the equivalent hydraulic protection of several feet of compacted clay.

Gcl

Part Two: Technical of GCL waterproof blanket

Part Three: The Application of GCL

This Bentonite production line is usded to bond 3layers of top geotextile, middle bentonite sand, and down plastic woven film.
The water proof bentonite pad is mainly used in penetration-proof,airproof &separation in rubbish burying square,man-made lake,channel,pool,basement,subway,etc.
The production line processing of finished products with high peel strength, strong pulling hardness, low permeability.