Comparison of fiber access and ADSL access in Internet network

The rapid development of the Internet has led to the further prosperity of Internet cafes, the access means of Internet cafes are not the same, network networking programs are also diverse. At present, Internet access schemes include broadband access such as fiber, ADSL, satellite broadband access and narrowband access such as DDN and ISDN.

Among the many Internet access modes, the operators of Internet cafes usually choose the fiber-optic access or ADSL network access. Optical fiber access is an ideal access mode, however ADSL network access is a popular Internet access scheme for Internet café operators.
　　
Why the Internet café operators will make such a choice, do not choose to aspire to the fiber-optic access and choose ADSL Access? The following separately from the network performance requirements of Internet cafes, access costs and tariff levels, application environment, etc. to analyze the advantages and disadvantages of fiber network access and ADSL network access.
　　
From the network performance requirements of Internet cafes:
　　
Internet cafes have become a huge industry, Internet cafes Network application types are very diverse, network bandwidth, transmission quality and network performance has higher requirements. Network applications to set advanced, more business, scalability and stability in one, not only to meet customers in the broadband network transmission of voice, video and data needs, but also support a variety of new business data processing capabilities, high-speed Internet access, large data flow under the line, do not pause. This kind of operation route of the Internet café decides its own must have the high speed, the stable, the safe network system can maintain the good development.
　　
Optical fiber access refers to the total optical fiber as the transmission medium between the local and the user, and the fiber access can be divided into active optical access and passive optical access. The main technology of optical fiber user network is light wave transmission technology. Optical fiber access is a kind of ideal broadband access, it can solve the problem of broadband network, fast, low barrier rate, strong anti-interference ability. However, for export bandwidth restrictions, if the number of users on the route increased sharply, will lead to the speed of network access steep drop, local drop is often encountered problems.
　　
ADSL is asymmetric digital subscriber loop technology, is the use of the existing pair of telephone copper wire, to provide users with downlink (from the Internet to the client) the highest 8M bandwidth, uplink (from the user to the Internet) the highest 640K bandwidth of the broadband access technology. ADSL has a high bandwidth and stability, so that you can ride in such a wide road without the feeling of traffic jams, but will not fall off the line, so that your surfing life unrestrained, unrestrained and comfortable. For Internet cafes, due to the number of nodes in the network, the data flow is larger, at this time can be applied to multiple ADSL line to upgrade the speed of the Internet, but also can improve the stability of the entire network reliability, a certain backup role. (Computer science)

Fiber access is good, fast speed is fast, but the user is a lot more easily off the line, and ADSL is a unique access mode, access rate is not affected by the number of users online, and more stable. I have a friend of the Internet Café (60 units) because switch to fiber after the often drop line, is part of the line, not the entire Internet café off line, many times is one or two computers or more than 10 computers off the line, but other computers are using normal.
　　
It's not going to happen when you used ADSL. It is because of this problem that a friend's business is much inferior to the previous one. I believe this situation will also happen to other internet cafes. The unique mode of operation of Internet cafes determines that Internet cafes must have high-speed, stable, safe network system, network access speed and stability is an internet café must consider the problem, ADSL is slower than the optical fiber point, but wins in stability, so ADSL access is worthy of the current network of Internet cafes suitable choice.
　　
From the cost and tariff level of access mode:
　　
The initial cost of optical access is high, the user needs to buy a pair of optical/electrical conversion equipment (commonly known as the Light Cat), the fiber-laying process is time-consuming, and once the cost of investment can not be withdrawn. And its tariffs are more expensive, generally paid by the way of monthly rent.
　　
ADSL access can be directly in the existing telephone line modification, do not need to transform the signal transmission lines, do not have to go through the wall punching, another cable, can completely use the ordinary copper telephone line as a transmission medium, as long as equipped with a dedicated modem can achieve high-speed data transmission. And the price is relatively low, pay a variety of forms, can be monthly, can also be used for a long time to pay. The main cost of its initial period is ADSL Modem.
　　
The fire in the Internet café industry is fierce, everyone is in the looting site, economic efficiency is the operator must first consider the problem. According to the needs of Internet cafes to choose a practical, feasible networking mode, the advanced technology into practical and economic products and solutions, in the input at the same time both obtain the reliability and strong performance, the pursuit of higher investment efficiency is a common Internet café operator consensus.
　　
The cost of the network is of course the bottleneck of choosing the Net-bar scheme. Fiber-optic access and ADSL access in many ways, but, in terms of cost, optical access is obviously hoe ADSL, cheap tariffs and low initial investment is ADSL access to a superior file.
From the application environment of access mode:
　　
Although optical fiber to the user (FTTH) is the inevitable direction of the future development of users access network, however, because of the high cost of optical fiber user network, in the next few decades, most access network will continue to use the existing copper loop, in a number of transitional broadband access network technology, ADSL is still the most promising and competitive technology, Will dominate in the next few years or even more than 10 years.
　　
ADSL initially mainly for video-on-demand business development, with the development of technology, gradually become a more convenient broadband access mode, ADSL has a wealth of business functions and a wide range of business prospects.
　　
ADSL is a "pragmatic" broadband access technology, the reason that it is "pragmatic", because its starting point is to make full use of existing fixed network copper resources, to achieve a breakthrough in bandwidth bottlenecks. This idea is important for maintaining the original investment in the telecommunications network, which makes the network more fully utilized.
　　
ADSL boom has swept around the world, the world's major information industry manufacturers are committed to ADSL technology and application development, making ADSL technology and its applications have been rapid development. Telecom operators in Europe, America, Australia, Japan, Korea and Singapore have successfully promoted ADSL business and formed a worldwide ADSL boom.
　　
Summarize:
　　
Broadband network opened, in the overwhelming advertising, through ADSL Internet, high performance, cheap. Broadband network, "The Speed of light, sea capacity," the characteristics of increasingly popular. Rich user resources and user access to copper resources is its advantage, just put a certain amount of money, you can use ADSL to provide users with broadband access to the business, is a good way to set up a broad broadband access network.
　　
However, because the copper access network is limited by some insurmountable factors, this makes the information superhighway form a "bottleneck" in the User Access section. In this case, people naturally think of optical fiber, no doubt that the optical fiber is the ideal transmission medium access network. Fiber can overcome some of the limitations that copper wires cannot overcome. The optical fiber loss is low and the bandwidth is wide, which relieves the limitation of small wire mesh diameter.
　　
In addition, the optical fiber is not affected by electromagnetic interference, guaranteeing the quality of signal transmission, replacing copper cable with optical cable, can solve the problem of urban underground communication pipeline congestion. With the continuous improvement of the optical fiber access and the falling price, the fiber access will become more and more popular. For all broadband applications, the optical access mode is very promising.