Recently, the Guangdong Provincial Government and the Zhuhai Municipal Government signed an agreement, and Zhuhai City officially launched the “Guangdong Province Green Lighting Demonstration Cityâ€. In the next two years, Zhuhai will have at least 30,000 high-pressure sodium lamps replaced with energy-efficient LED street lamps (semiconductors). flashlight).
The Guangdong Provincial Government personnel attending the signing ceremony of the agreement said that the special action of the “Green Lighting Demonstration City†initiated by Guangdong Province is to give full play to the government's demonstration and guiding role, and to use large-scale LED street lamps to make the terminal consumer market and finally pull the LEDs. Industrial leapfrog development.
According to the agreement, Zhuhai will select demonstration buildings, urban roads, tunnels, plazas, etc. to carry out demonstration projects in batches, and strive to complete the LED lighting renovation in 2012, and the total number of street lamps will be no less than 30,000. The lamps used in the project will all adopt the products of the province that meet the "Guangdong Province LED Street Light Local Standards" and are tested and recommended by the LED lighting product evaluation standard system. Under the same conditions, the products of Zhuhai City will be purchased preferentially.
In terms of engineering financing, Guangdong Province adopts the business model of “contract energy management + supply chain management + finance†and has formulated a 25:75 fund solution, that is, the provincial and municipal finances are financially invested according to 25% of the total cost of LED street lamps. Funds (where the provincial finance grants 10% of the grants), and the remaining 75% are financed by the supply chain management company.
In addition, other cities in the Pearl River Delta have also signed up to create a “green lighting demonstration cityâ€. It is estimated that in the next two years, more than 600,000 LED street lights will be installed in the Pearl River Delta region, and it will be the first to create a new path for LED industry development with “promoting applications and promoting development through applicationâ€.
The first batch of "Guangdong Province Green Lighting Demonstration City Recommended Procurement Product Catalogue" released by the Science and Technology Department of Guangdong Province has been listed on the list of six Guangdong enterprises including Guangzhou and Dongguan. At present, Zhuhai Dehao Runda Company has also submitted an application, and it is expected to become the first LED manufacturing enterprise in Zhuhai to enter the recommended catalogue, thus obtaining the priority purchase right.
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The connection sequence of RJ-45 line in common B standard is orange white, orange, green white, blue, blue white, green, brown white and brown. When connecting different equipment, use standard a. the connection sequence is green white, green, orange white, blue, blue white, orange, brown white and brown. Generally, the pressing method of b-mark is commonly used. If you want to make a cross line, one side is a standard, and the other side is b standard.
Working in the data link layer, the switch has a high bandwidth back bus and internal exchange matrix. All ports of the switch are connected to the back bus. After the control circuit receives the data packet, the processing port will look up the address reference table in memory to determine which port the NIC (network card) of destination MAC (hardware address of network card) is attached to. The data packet is quickly transmitted to the destination port through the internal exchange matrix. If the destination MAC does not exist, it will be broadcast to all terminals After the receiving port responds, the switch will "learn" the new address and add it to the internal MAC address table. The switch can also "segment" the network. By comparing the MAC address table, the switch only allows the necessary network traffic through the switch. Through the filter and forward of switch, the conflict domain can be effectively reduced, but it can not divide network layer broadcast, that is, broadcast domain. The switch can transmit data between multiple port pairs at the same time. Each port can be regarded as an independent network segment, and the network equipment connected to it can enjoy all the bandwidth without competing with other devices. When node a sends data to node D, node B can send data to node C at the same time, and these two transmissions enjoy the full bandwidth of the network and have their own virtual connections. If a 10Mbps Ethernet switch is used here, the total flow flux of the switch is equal to 2 × 10Mbps = 20MBps, and the total flow flux of a hub will not exceed 10Mbps when using 10Mbps shared hub. In a word, switch is a kind of network equipment based on MAC address recognition, which can encapsulate and forward data frames. The switch can "learn" the MAC address and store it in the internal address table. By establishing a temporary exchange path between the originator and the target receiver of the data frame, the data frame can reach the destination address directly from the source address.
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