According to foreign media reports, SpaceX has successfully launched and recycled the re-used "Falcon 9" rocket for the second time. It was learned that the first stage of the rocket, the 14-storey core used for loading fuel and the main engine of the rocket, had already taken off from the launch pad near Cape Canaveral, Florida, and was subsequently in the company. Landing on the Atlantic unmanned barge. This is SpaceX’s 12th successful rocket recovery and the 7th time at sea. This reusable rocket first sent 10 communications satellites from Iridium to space orbit in January this year. After that, it landed on a drone barge on the Pacific Ocean. SpaceX then refurbished the rocket and it launched its first communications satellite for television service provider Bulsatcom on the afternoon of June 23 local time. However, according to SpaceX CEO Musk, the landing will not be easy because the rockets need to transport BulgariaSat-1 to very high orbits. In the process, the first stage rockets need to withstand greater pressure than ever before. And heat. Musk even quipped: "This is a good opportunity for the Rockets to not come back." But in the end, the Rockets still safely landed on unmanned barges. Musk wrote on the social media platform: "All things are fine, except that the rocket gets hotter and the landings are heavy." Reusable rockets have always been the goal that Musk wants to achieve because it can greatly reduce rocket launch costs. Now, he is already approaching this goal.
POE (Power Over Ethernet) refers to the use of IP-based terminals (such as IP phones, wireless LAN access points AP, network cameras) without any changes to the existing Ethernet Cat.5 cabling infrastructure. Etc.) The technology that can provide DC power for such devices while transmitting data signals is a switch that supports Power over Ethernet.
POE is also known as a power supply system based on local area network (POL, Power over LAN) or Active Ethernet (Active Ethernet), sometimes also referred to as Power over Ethernet for short. This is the use of existing standard Ethernet transmission cables to transmit data and data at the same time. The latest standard specification of electric power, and maintains compatibility with existing Ethernet systems and users. The IEEE 802.3af standard is a new standard based on the POE of the Ethernet power supply system. It adds related standards for direct power supply through the network cable on the basis of IEEE 802.3. It is an extension of the existing Ethernet standard and the first international standard for power distribution. standard. Ethernet Poe Switches,Din Rail Mount Switch,Gigabit Din Rail Poe Switch,Managed Port Industrial Switch Shenzhen Scodeno Technology Co.,Ltd , https://www.scodenonet.com
IEEE began to develop the standard in 1999, and the earliest participating vendors were 3Com, Intel, PowerDsine, Nortel, Mitel and National Semiconductor. However, the shortcomings of this standard have been restricting the expansion of the market. Until June 2003, the IEEE approved the 802.3af standard, which clearly stipulates the power detection and control items in the remote system, and connects routers, switches, and hubs to IP phones, security systems, and wireless LANs through Ethernet cables. The method of power supply for points and other equipment is regulated. The development of IEEE 802.3af includes the efforts of many company experts, which also allows the standard to be tested in all aspects.
The IEEE 802.3at standard was formulated in 2005 and promulgated in 2009. The 802.3at standard output power can reach 30W, and the available power at the receiving end is 25.5W.
The IEEE 802.3 working group and various manufacturer alliances launched POH-POWER OVER HDBASET in the industry at the end of 2012.
Using the current 4-Pair four-pair wire technology plus, the bilateral power supply can reach 60-100W power, which can be achieved by using 5 or 6 types of wires. It is used in high-definition video promotion to supply power to 42" LED TVs. According to the new regulations in 2010, the power consumption of 42" LED TVs needs to be less than 70W.