Digital User Line (XDSL) is a modern technology for providing broadband data access on traditional telephone networks (POTs) for home and business. XDSL is collectively referred to as ADSL, G.Lite, HDSL, SDSL, IDSL, and VDSL, SDSL, IDSL, and VDSL, SDSL, IDSL, and VDSL, SDSL, IDSL, and VDSL. XDSL is often used to solve the "last kilometer" transmission bottleneck problem because they are only used in telephone exchangers and home or office connections, rather than connecting between switches.
The Similarity of XDSL and IDSL has the following two points: one, running on the existing telephone network (POTS) is used in precision modulation mode; Second, it requests a short-range operation to the central telecommunications office (generally less than 20,000 miles). However, XDSL provides a higher speed-upper flow reaching 32 Mbps, downstream traffic from 32 kbps to 1 Mbps or more.
Various supports some related modulation techniques:
Discrete Multi-Voice Rehabilitation Technology (DMT); Simple Line Code (SLC); No Carrier Amplitude and Phase Modulation (CAP); Multi-Virtual Digital User Line (MVL); Discrete Wavelet Multi-frequency Modulation (DWMT).
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