Thread: What are ADSL and ADSL 2+

ADSL is the abbreviation for "Asymmetrical Digital Subscriber Line". ADSL is one of xDSL technologies that improve the performance of access networks and in particular subscriber line standard telephone network, consisting of copper wires. By using two modems, one located at the subscriber's location, the other on the subscriber line, at the main exchange, it can significantly improve the network throughput and receive transmissions 70 times faster than traditional analog modem. The principle of ADSL is to reserve some bandwidth to carry voice, another to transport data flowing towards the core network (data upload) and the third largest for the data transport, traveling to subscribers (download data). To correct the return of the voice, filters located at each end of the line remove unnecessary parts of the signal. ADSL technology is particularly well adapted for local loop connections as it's flow rate decreases with the length of the line. Because of its low cost, it is an interesting solution to benefit for quick access to the Internet.

ADSL 2+ pushes the limits of copper wire to 2.2 MHz frequency on telephone lines. Consequently, the theoretical maximum throughput reaches 25 Mbps downstream and 3 Mbps in upload. However, with ADSL technology, the increasing frequency also determines the signal range. With ADSL 2+, it is therefore necessary that the telephone is located within two kilometers of the central exchange for rates exceeding 10 Mbps.

Good one................