ADSL (Asymmetric Digital Subscriber Line) is a new modem technology that promises to revolutionize online commerce, communications, and entertainment. ADSL transforms the existing copper telephone lines into an instant high-speed connection for Internet access, video conferencing, remote access, and multimedia applications.
The existing ADSL installation techniques require a splitter in the subscriber's home to separate the POTS (Plain Old Telephone Service ) channel from the ADSL channel. To install the splitter, the telephone company must send a technician to the customer's premises to set up the device. In addition, a second pair of wires may be required to connect the splitter and the ADSL modem. These truck rolls create significant cost to the telephone companies.
Also, to receive ADSL services, the consumer will need to purchase an ADSL ATU-R (ADSL Transmission Unit-Remote), a modem- like piece of equipment, as well as paying for the modem, line provisioning cost, inside wiring fee, NIC (Network Interface Card), and the technician services fee. Thus, the up-front cost of getting an ADSL line can be very high, possibly even prohibitive, for many residential users.
Because of the above-mentioned obstacles (high cost and technical complexity) and the fact that most users may not actually need to use all the available bandwidth offered by full- rate ADSL implementation, efforts were made to develop reduced-rate ADSL which sacrifices speed in favor of operating without a splitter. Thus, a new version of ADSL that would be consumer installable was born. The Universal ADSL Working Group (UAWG) was formed in January 1998 to address these issues and develop a proposal for submission to the International Telecommunications Union (ITU) for adoption as a standard called G.Lite, which was adopted in October 1998. The formal ratification will take place in June 1999. The transmission speed of G.Lite (G.992.2) is 1.5Mbps downstream and 512Kbps upstream.
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