How ADSL works

How ADSL works On the wire Currently, most ADSL communication is full-duplex. Full-duplex ADSL communication is usually achieved on a wire pair by either frequency-division duplex (FDD), echo-cancelling duplex (ECD), or time-division duplexing (TDD). FDD uses two separate frequency bands, referred to as the upstream and downstream bands. The upstream band is used for communication from the end user to the telephone central office. The downstream band is used for communicating from the central office to the end user. Frequency plan for ADSL. The red area is the frequency range used by normal voice telephony (PSTN), the green (upstream) and...

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ADSL standards

ADSL standards Frequency spectrum of a modem on a ADSL line. Standard name Common name Downstream rate Upstream rate Approved in ANSI T1.413-1998 Issue 2 ADSL 8 Mbit/s 1.0 Mbit/s 1998 ITU G.992.1 ADSL (G.DMT) 12 Mbit/s 1.3 Mbit/s 1999-07 ITU G.992.1 Annex A ADSL over POTS 12 Mbit/s 1.3 Mbit/s ITU G.992.1 Annex B ADSL over ISDN 12 Mbit/s 1.8 Mbit/s ITU G.992.2 ADSL Lite (G.Lite) 1.5 Mbit/s 0.5 Mbit/s 1999-07 ITU G.992.3 ADSL2 12 Mbit/s 1.0 Mbit/s 2002-07 ITU G.992.3 Annex J ADSL2 12 Mbit/s 3.5 Mbit/s ITU G.992.3 Annex L RE-ADSL2 5 Mbit/s 0.8 Mbit/s ITU G.992.4 splitterless ADSL2 1.5 Mbit/s 0.5 Mbit/s 2002-07...

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Installation issues

Installation issues Due to the way it uses the frequency spectrum, ADSL deployment presents some issues. It is necessary to install appropriate frequency filters at the customer's premises, to avoid interference with the voice service, while at the same time taking care to keep a clean signal level for the ADSL connection. In the early days of DSL, installation required a technician to visit the premises. A splitter or microfilter was installed near the demarcation point, from which a dedicated data line was installed. This way, the DSL signal is separated earlier and is not attenuated inside the customer premises. However, this procedure is costly, and also caused problems with customers complaining about having to wait for the technician to perform the installation. As a result, many DSL...

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External links

External linksADSL Theory — Information about the background & workings of ADSL, and the factors involved in achieving a good sync between your modem and the DSLAM.(The UNH-IOL DSL Knowledge Base (advanced tutorials))ADSL Research ReportADSL TutorialDSL How-To Complete guide from scratch; how to install cabling & service, and configure a Linux-based machine as an advanced/sophisticated router.Various ADSL Technical Information [hide]Internet access Network type Wired Wireless Optical Coaxial cable Ethernet cable Phone line Power line Unlicensed terrestrial bands Licensed terrestrial bands Satellite LAN 1000BASE-X G.hn Ethernet HomePNA · G.hn G.hn Wi-Fi · Bluetooth · DECT · Wireless USB WAN PON DOCSIS Dial-up · ISDN · DSL BPL Muni Wi-Fi GPRS · iBurst · WiBro/WiMAX · UMTS-TDD,...

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Install Windows XP (Part 4)

Step 19 - Finally Windows will start and present you with a Welcome screen. Click next to continue. Step 20 - Choose 'help protect my PC by turning on automatic updates now' and press next. Step 21 - Will this computer connect to the internet directly, or through a network? If you are connected to a router or LAN then choose: 'Yes, this computer will connect through a local area network or home network'. If you have dial up modem choose: 'No, this computer will connect directly to the internet'. Then click Next. Step 22 - Ready to activate Windows? Choose yes if you wish to active Windows over the internet now. Choose...

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