Do you know the 100-year history of car headlights? The car has been born for more than a hundred years, but also the era of rapid advancement of human science and technology. With the advent of the electrical age, the electrical components on the car have also undergone tremendous changes, the most representative of which is the development and evolution of the vehicle headlights.
From the initial steam lamps to electric lights, from halogens to LEDs, to the latest laser headlights, from the very beginning for pure lighting, to night vision, decoration, and even incorporating brand features and other elements, vehicle headlights It has become one of the most characteristic parts on the vehicle. Today, I will talk to you about the development of car headlights.
Early cars were without headlights.
Whether it was the world's first wagon-type three-wheeled car developed by Bentz in 1885, or the first four-wheeled car invented by German Gedley Daimler in the same year, the first consideration for early car inventors was How to get the car to move quickly and steadily, not lighting, so they didn't install a decent car light on the car.
The world's first car, "Benz One," from the picture, is not equipped with lights.
The lights that really spread to the car were transplanted from the carriage, the most mainstream lighting tool before the invention of the electric light - kerosene lamp! It is also from the kerosene lamp that the car headlights began to escalate along with the wave of the electrical revolution.
From the kerosene lamp, the car headlights have roughly experienced acetylene lamps, incandescent/halogen lamps, xenon lamps, LED lamps and the most advanced laser headlamps in the past six eras.
RJ45 We are manufacturer of RJ45 3U Gold in China, if you want to buy Gold Flash Plated,8P8C with Shield,Shield with EMI please contact us.
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.
RJ45 PLATING 3U Gold,Flash Plated for Gold,8P8C with Shield connector,Shield with EMI connector
ShenZhen Antenk Electronics Co,Ltd , https://www.antenkconn.com