How Does a DSL Modem Work?
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Much Faster Than Dial-Up
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The days of dial-up modem connections as the only source for accessing the Internet ended when faster, alternative methods were created. DSL connections were one of the more popular ways. Although they utilize a phone line, DSL modems can still provide connection speeds at least 35 times faster than a 28.8k dial-up modem. This article will explain how the DSL modem works.
DSL Explained
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DSL stands for digital subscriber loop or digital subscriber line. DSL lines can still use regular telephone lines without needing a separate line installed. This is because the information sent is digital, rather than analog. Since digital information takes up considerably less space, a DSL connection can be sent through the telephone line without you having to hang up or interrupt your regular phone service.
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Modem Design
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DSL modems work by providing fax, telephone and internet connections within the unit. It connects to your computer through the USB or Ethernet line. The modem sends and receives computer information through the telephone line connection. The speed and strength of the signal is based on the distance between you and the server. DSL design is based on a theory that Internet connections to the user are at least three times faster than user connections to the Internet. The closer you are to the main server, the faster your connection will be.
DSL Limitations
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The number of DSL users in your area can also affect performance speeds. When the DSL modem sends your signal to the provider, it is received by their own specialized modem called a DSLAM. There is no direct connection between your modem and Internet servers in the world. The DSLAM uses one line to support many connections that are hooking up to the internet. Although they can handle dozens of connections at once, the speeds can slow down as more users log on.
DSL modems cannot be used everywhere. Again, there are limitations based on the locale of the ADSL servers. If there are bridge taps to your phone line service that stretch the actual connection, it may still be out of reach from your home. DSL connections cannot pass through fiber optic lines. If your phone lines contain them, you're out of luck.
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