ADSL, optical fiber, network cable broadband and fiber-optic line? What are the characteristics between them? The following small series introduces the difference between ADSL, optical fiber, network cable broadband and fiber-optic line in office website applications. [ADSL Broadband] This is the familiar telephone line broadband, that is, the home line is a telephone line, which can be connected to both the telephone and the broadband cat at the same time. ADSL is a data transmission method. It uses frequency division multiplexing technology to divide a telephone line into three channels: voice, uplink and downlink. It is independent of each other and does not interfere. Therefore, when using this line, you can also make calls at the same time. The downlink speed of ADSL is not equal to the uplink speed. The downstream bandwidth is what bandwidth you open. The so-called 4M, 6M, or 8M is the downlink speed. The uplink speed is generally fixed, usually 512Kbps. Very small drops. Therefore, using ADSL broadband to build a headquarters server to achieve off-site office is a bad choice, because the off-site office needs the uplink speed for the network where the server is located, and the uplink speed is too small, which will make the website accessing the website of the headquarters server feel the webpage opening speed is special. slow. [Fiber Broadband] The newly built residential areas are basically fiber-optic broadband. Broadband operators usually give away a light cat when installing broadband. The downlink speed also needs to be determined according to the type of broadband that it is open, and the uplink is usually 1 Mbps, which is double the ADSL. For a small number of small Wei enterprises, you can choose fiber-optic broadband to build a headquarters server to achieve off-site office. With an uplink speed of 1 Mbps, it is basically enough to satisfy one or two simultaneous online access. Of course, this is relatively speaking. In the future, as software developers develop more and more things, they can't guarantee that they will be enough in the future. [Fiber Optic Line] As we all know, the fiber optic line is more expensive. For now, a 4M line is about 10,000 RMB. For speed, the fiber-optic line is equal to the uplink and downlink, meaning 4M dedicated line, the downlink speed and the uplink speed are both 4M. The network built by the fiber-optic line has a fixed IP address. Unlike other broadband networks, the IP address may change after each dial-up authentication succeeds. How to implement remote access for a network without fixed IP? DDNS is the solution, and the general broadband routers support DDNS. For enterprises with a large number of people, it is necessary to work in different places, and the dedicated line has sufficient uplink speed to provide data for different places. Similarly, there is a need for a dedicated line to have enough uplink speed to upload data to the server. There is also a problem that needs attention. When the fiber broadband is opened, the internal website we built cannot be accessed through the external network. This is because the 80, 8080 ports required for the website service are in a forbidden state. After you need to apply for ICP filing, the ISP will open these ports for the dedicated line. [Network cable broadband] This kind of broadband is a little rare, that is, the home line is a network cable, no need for cats to convert. For the uplink and downlink speeds, different broadband providers may have different regional differences. Most broadband providers still limit the uplink speed to the same as ADSL broadband, and some broadband providers can apply for it, even if the upstream bandwidth is greater than the downstream bandwidth. Self-built servers to build a website is a bit uncertain, some can be opened after the opening, and some still need ICP filing. [Summary] Bao Yun finally came to summarize the partners. To build a website to realize remote office work, you need to consider the uplink and downlink bandwidth of the network where the server is located, and the uplink and downlink bandwidth of the remote network. For the two-party network, uplink and downlink are relative concepts. The data is downloaded from the remote network, which occupies the downlink bandwidth, and the server occupies the uplink bandwidth. Otherwise, the data transmitted by the remote network occupies its upstream bandwidth, and the server is the downlink bandwidth. The fiber-optic line needs to be ICP-posted for the website to pass, and other broadband is not needed; the former has fixed IP and the latter does not. This article comes from [system home] www.xp85.com Related articles recommended: 1. How to install ADSL broadband connection in win7 system installation 2. Why 100M broadband network speed is so slow 3. ADLS broadband dialing error full solution