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Modem Flavors

Saturday, April 23rd, 2005 by | Filed Under: Hardware & Peripherals
 
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Q:
What’s with all the different modems? I see dial-up, DSL, Cable—what does it all mean?

A:
Modem is short form for “demodulator/modulator”. A modem allows a computer to send or receive data/information through a connection. It works by changing the regular analog signal to a digital signal to be used by computers. Different types of modems exist such as dial-up, cable, DSL, and wireless.

Different Types of Modems

Here are short explanations of each type and an estimation of how fast each modem is:

Standard Dial-up — These modems have the slowest transfer speed (downloads) of all modems. Dial-up modems are capable of speeds of up to 56 kilobits per second through an Internet Service Provider connection. Dial-up modems use copper phone lines to connect with the Internet.

DSL (Digital Subscriber Line) — DSL is also provided through regular copper lines though it is not available to everyone, since you have to be close to a telephone switching office (usually within about 4 miles). DSL speeds can differ depending on the quality of the connection. Still, download speeds typically will be about 1000 kilobits per second on a good connection.

Cable Modem — A cable modem runs over cable television lines. The coaxial cable it uses gives you much more bandwidth than dial-up and therefore gives you extremely fast access to the World Wide Web. These modems can give you a transmission rate of about 2000 kilobits per second which is about 40 times faster than the top speed of dial-up! However, speeds may vary depending on the location or other concerns.

Wireless Broadband Internet — Wireless Internet (Wi-fi) connects using radio frequency signals, rather than phone lines or cable television lines. Also, you can connect to the internet within a limited range, which means an equipped laptop can connect to the internet away from home easily when a “Hotspot” is available. Wireless Internet is popular in PDAs, cellular phones, and other portable devices including laptops and notebooks. You will need special equipment to use Wireless Internet, which is probably around $100 or so. Download speeds of Wireless Internet can sometimes reach about 1.5 megabits (around 1500 kilobits).

I hope this clears things up for you.

~Jesse Pimentel

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