What is DSL?

DSL is the fastest-growing high-speed broadband Internet access technology in the world. Its full name is digital subscriberloop (digital user loop). Its History will be traced back to 1988,Bell lab
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Engineers have designed a way to load digital signals to unused telephone lines, which enables data communication over a common telephone line without affecting the voice service. But Bell's management is not enthusiastic about this, because if the user installs two lines, it will bring more profits. This situation did not improve until cable TV companies began to promote broadband Internet access in the 1990 s. When it was realized that most users would definitely give up installing two telephone lines to access the Internet, bell moved out of the DSL technology they have discussed for 10 years to compete for the broadband market share of cable TV network companies.

 

Including HDSL, SDSL, VDSL, And ADSL, which are generally called XDSL. Their main differences are the differences in signal transmission speed and distance, and the differences in Uplink speed and downlink speed symmetry. ADSL is asypolicric Digital Subscriber Line (Asymmetric Digital user circuit ). Because most people access the Internet by browsing the Web page to find information, but not a lot of data is uploaded, ADSL is aimed at such network usage characteristics, so that the computer can download data faster than uploading data, therefore, it is called an asymmetric user loop ". ADSL is the most widely used XDSL technology in the world.

DSL is characterized by a common copper telephone line as the transmission medium, which is widely implemented and protects the original investment. As a broadband network connection technology, the network connection speed is intoxicating, And the ADSL upload speed reaches 604 ~ 1 Mbps. The downstream speed can reach 8 Mbps, 150 times that of a common 56 K modem. In addition, when using ADSL, because the voice and data are transmitted separately, the Internet access will not affect the normal use of the phone. If you use ADSL, you do not need to pay another phone fee and stay online, it is a physical connection method.