News

As early as 40 years ago, there have been discussions on routing technology, but until the 1980s routing technology gradually into commercial applications. The reason why routing technology is not widely used in the beginning mainly because of the advent of the 1980s before the network structure is very simple, routing technology useless. Large-scale Internet only became popular for the development of routing technology to provide a good foundation and platform. As the network gradually to the public, Internet cafes have sprung up in the streets alley. But with the increase in the number of Internet cafes between competition has become increasingly fierce. And by expanding the scale and lower costs to optimize the operating environment has become an inevitable trend of Internet development. In the past, most domestic mainstream size is the number of Internet cafes in the 60-100 Taiwan PC connected to the Internet through a SOHO router, the network connection has a simple structure, low cost advantage. But with the increase in the number of network PC, the original network access system network frequently dropped, the game was stuck, hacker attacks, viruses, flooding and other issues. Faced with these, Internet cafe owners to consider whether the upgrade over the Internet router. Limit Internet access bottleneck benign operations: PC size 60-100 units Internet network, SOHO router to meet the basic needs of network access. But after more than 100 the number of PC, if you still use SOHO router access, the entire network system is relatively fragile, Which is mainly manifested in the following aspects: The first is the low performance. To save costs, SOHO routers commonly used general performance CPU, memory speed is relatively slow. In a particular use, there will be slow download speeds, the game will be the card, this is the performance of low performance. Followed by poor stability, easily dropped, and this is the most taboo gamers. Some SOHO router in a small number of users they can maintain a stable connection; but if the size is increased somewhat, it is difficult to ensure the stability of the network, and when network traffic increases, it will frequently restarted. And SOHO router using ordinary external power supply, when the voltage fluctuations, power SOHO routers can not be guaranteed. The third difference is the heat. Under normal circumstances, SOHO routers are small, there is no reasonable thermal design the machine, and Internet cafes are usually open 24 hours, so SOHO router heat will become a problem. The most direct impact on the router overheating is unstable. Finally, a small number of PC support. Small SOHO router memory capacity (typically 2M-8M), FLASH capacity is small (generally only 1M), a limited number of users supported, essentially carried out the largest number of NAT within 1024. You can do the math, to open a Web page, it takes approximately 10-50 NAT number of processes, so SOHO router supports PC small amount, it is difficult for extensions upgrade.

First, it is entirely possible welding and exchanges. But if you want the DC is usually in a bridge rectifier diode to complete. Alternating current from the welder by welding torch, by grounding cable and go back to your machine. It then flows in the opposite direction. The result is a deep penetration in the weld and remove impurities. It is mainly used for aluminum and alloys. DC has both positive and negative two settings: The difference is the direction of the current. A mobile welder, by torch, through the material and return to the ground; the other in the opposite direction flow. AC machine can only run in one direction, but the DC machines can run in both directions depending on the current direction. If we change the polarity of the input supply can reverse the movement of the direction of our DC motor. The above answer is not entirely correct, because it is very easy to change the direction of an AC motor. For example, changing the direction of rotation of three-phase induction motor, motor controller switch two three-conductor wire. The main difference is the use of direct current speed of the machine easier to control, but that is a thing of the past due to the development of electronic motion controller.

Ladies and gentlemen: Mine is a seller that has more than ten years experiences of selling power tools, welding tools and garden tools since 2004. I remember mine first exporting work is beginning with a national foreign trade documentary. The first work factory is a electric appliance supplier. So this experiences is base on selling electric tools. And also give me enrich courier arrangement experiences. On 2005 when i negotiate with forwards, they guess i must have 5 working experiences on courier. When begin on exporting work is on 2007. I go to yiwu futian market to rent a store to sell power tools, welding tools and garden tools. There is mine real work and real selling. There is different customer need different quality tools. So you could study different quality tools. And study different price with different quality. On 2011 come back factory to work. I have a chance to study more on professional manufacture. Here i found power tools main technique. How to find what quality is good, what quality is middle. more authentic to find the different. Technique is base to make professional. Testing to verify quality is passed or not. Product is money to get benefit. Here is not only price. Here is paradise of good price with good quality. Welcome to check mine web to find what is your needing. And send email to me any time to ask what you want to know. I also would to reply you soon.