The development of the Internet is rapidly entering the era of broadband. At present, there have been many solutions to deal with the broadband access of the "last 1 km of the information highway", such as: FTTH (fiber to the home) access network, HFC (hybrid fiber coaxial cable) access network, optical fiber + dual Stranded Ethernet, high-speed wireless access network, xDSL, etc.
In addition to xDSL broadband access, the construction of several other types of access networks requires rewiring or establishment of wireless base stations. In the construction of broadband, the cost of wiring projects or wireless base station construction projects accounts for a very large proportion of the total cost. These solutions undoubtedly increase the operating costs of network operators and affect their competitiveness.
xDSL is the general term for several types of DSL (Digital Subscriber Loop), including ADSL (Asymmetric Digital Subscriber Loop), VDSL (Very High Bit Rate Digital Subscriber Loop), SHDSL (Symmetric High Bit Rate Digital Subscriber Loop) and IDSL (ISDN Digital Subscriber Loop), etc. xDSL is to avoid the drawbacks of rewiring and make full use of the broadband access technology developed by the existing copper telephone lines. Among them, ADSL has been developed for many years and has become a more mature DSL technology. According to the distance between the user and the telephone central office and the quality of the telephone line, ADSL can provide a downlink rate of 1.5 Mbps to 8 Mbps and an uplink rate of 64 kbps to 2 Mbps. Now it has become one of the broadband access technologies promoted by telecommunications companies in various countries.
VDSL is the fastest asymmetric digital subscriber loop. Due to its high-rate characteristics, VDSL has a very promising future, such as: video and TV programs, high-speed data, video conferencing, cheap T1 and a small number of T3 services, large residential Multimedia services in districts and campuses. Now some foresighted domestic and foreign companies are increasing their investment, expanding VDSL technology, and combining other advanced and mature technologies with VDSL to develop more practical new technologies. The Ethernet technology based on VDSL is A typical representative. The emergence of this new broadband access technology has posed a strong challenge to the "optical fiber to cell, twisted pair to home" Ethernet broadband access operation model being built by some domestic network operators.
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Barista making coffee
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