Analysis Ethernet technology development and application of

In Ethernet technology (PoE) the development of Fujitsu Lifebook s6000 Laptop Battery of the "In the future, cable definitely better looking than the power line," bold vision, in the Power over Ethernet technology, a large number of applications is yet to come when we its gives a beautiful looking forward to: Power over Ethernet flowers open in the future.

Everyone cheers

Power over Ethernet technical evaluation of the industry are not low. In the future, cable definitely better looking than the power line, this bold statement can be achieved, depending on whether the mana over Ethernet power supply is large enough.

"With the establishment of IEEE 802.3af standard, Power over Ethernet market, thus to obtain a cardiac stimulant to facilitate the IP phones and wireless access equipment promotion. And a large number of applications also will rapidly come to the fore, including Bluetooth access point, light work, network printers, IP phones, Web cameras, wireless bridge, access control card readers and monitoring systems. users of the current Ethernet device integration of new power supply device can be in the existing Network Online provides 48v DC power supply, reducing the total cost of network construction and protect the investment. "Burton research director Dave Passmore depict Power over Ethernet bright application prospect.

Commented Cisco Power over Ethernet, "in June 2003, has always been a serious Sony Vgp-bpl2 Laptop Battery approved a standard sounds very avant garde - IEEE 802.3af, the standard pairs of routers, switches and hubs via Ethernet cable to the IP phones, wireless LAN access points and other equipment powered manner has been stipulated. the realization of the technology may make notebook computers in the future will no longer need any bulky batteries and cumbersome plug, as long as it can connect to the network, network cable networked devices will automatically power. "

"With the network, IP phones, IP video surveillance applications, coupled with wireless Ethernet applications are increasingly being used to provide power over Ethernet support requirements of its increasingly urgent, Ethernet has become the inevitable trend of . Alcatel attaches great importance to the development of Ethernet technology, research and development into a powerful force in Omniswitch series Ethernet switches to launch the corresponding modules. "Alcatel's technical staff commented.

"We're not yet using Ethernet technology, but if adopted, will bring the convenience of management and maintenance on the telephone to maintain the working classes can be done by the Networks Division, if the price can be down some, would be very promising . "Ministry of Finance Information Center is responsible for network management, Wang Bin, commented on the Ethernet technology. In fact, the reporter tried to interview users of Power over Ethernet, the Internal Revenue Service in Beijing, China Netcom (Beijing) Communications companies have expressed concern on this topic, get answers are also similar. "At present, wireless local area network in China Netcom (Beijing) communications company has no large-scale applications, but it will certainly be used, when the time is bound to consider the Power over Ethernet." Mr. Chen says of the unit.

Power over Ethernet technology, the industry generally optimistic, the above statement a few Ibm Thinkpad t43 Series Laptop Battery have also proved this point, indicating that it will have a bright future.

Electric where he comes from?

No external power supply, IP phones, wireless LAN and even laptop computers can work, it sounds like a very God, right? Electric where he comes from it?

Power over Ethernet technology sounds somewhat mysterious, and some journalists have been doing in the IT field of friends chatting about this topic, most of them expressed a novel. Power over Ethernet in the end is how it work? Following a simple application to analyze.

In general, IP telephony equipment requires two interfaces: one connected to the LAN and another connected to the AC supply network. As for other network devices, such as wireless LAN access devices, laptop computers and network cameras, also need two sets of interfaces. This, in addition to cable, the power cord is indispensable. In addition, many network equipment needed for practical operation, must be placed in a special place, wireless LAN is the most common examples. In order to achieve a certain radio coverage, wireless access devices are usually placed in the ceiling, but in this place is difficult to find a suitable AC output interface. 802.3af standard-setting specifications is for these devices no longer need to power line interface born, that is, power over Ethernet. 802.3af defines a set of methods to build power supply equipment and electrical equipment, including unshielded twisted-pair transmit 48v AC applied to the existing cable equipment, such as 5/5e/6 type cable, with wire frame, the output port, the connection hardware.

The standard defines two methods: Mid-Span and End-Span. The former is to use the Dell Inspiron 9400 Laptop Battery is not being used in pairs to transmit DC, because in Ethernet, only used four pairs of wire cable in the two pairs to transmit data; the latter is used in the transmission of data over cable At the same time transmit DC, the signal frequency and the Ethernet data signals of different frequencies, the current method is more favored. Industry experts pointed out that the End-Span popular reason is that this method can be embedded into support for Power over Ethernet switch, users often buy such switches for IP phones or wireless LAN. End-Span while allowing coexistence of Gigabit Ethernet and Power over Ethernet, which provides three kinds of speed 10/100/1000Mbps connection. Lenovo Networks Ethernet switch product line and technical personnel, said, End-Span in the signal transmission is more assurance of quality.

Correspond with the data network, 802.3af technology also supports multipoint power distribution equipment, network administrators only need the core part of the network device can be equipped with a UPS that a variety of disparate devices within a local network to provide power backup, and 802.3 af technology also provides Web-based SNMP remote access control, and management. This power supply in addition to the convenience of the implementation, but also solve the electricity after power is similar to the past, IP phones, wireless LAN does not work.