Jen Finney

Chapter 6: Modem, Dial-Up, DSL, Cable, Wireless

    A modem s important for your internet connection. It converts a signal into a connection that can be read by your computer. A modem can also be called a modulator or a demodulator and it performs a conversion from a a digital byte (or digital data) to an analog signal. After this conversion happens, the analog signal is then sent over the television cable, telephone line, or air, depending on which kind of modem you are using. 

There are three types of Modems:
    Dial up internet operates using a dialed connection via a telephone line (Kroenke, 185). Dial up is the slowest form of internet connection you can get. The one advantage of using a dial up connection is it is very cost effective. The huge disadvantages are that it is very slow - your download speeds are limited - and another is that your telephone lines are in use any time you are on the internet; therefore, you cannot use the telephone and access the internet simultaneously. 

    DSL stands for digital subscriber line and it is a type of modem that operates on the same line as a telephone. A DSL modem will not interfere with your telephone; they can operate simultaneously. DSL service can have different speeds; DSL lines that have different receiving/transmitting speeds are called asymmetric digital subscriber lines (ADSL). DSL lines that have the same receiving/transmitting speeds symmetrical digital subscriber lines (SDSL). 

    Cable modems provide the fastest service and it operates using cable television lines. You do not need to have a telephone landline for a cable modem to work in your house. Cable modem service costs more than a DSL service but it is faster. If you are operating on multiple computers in one home it is smarter to use a cable modem so that your service will be faster. 

What is a Modem


    
    A wireless connection is any kind of computer network that is not connected by any type of cables.The connection is instead established by radio waves. There are different types of wireless networks: WPAN, WWAN, WLAN, WMAN. WPAN is a wireless personal area network - it interconnects devices within a small area. WWAN stands for wireless wide area networks. It is a wireless network that covers larger areas such as towns, and cities. WLAN stands for wireless local area network. This network links two or more devices over short distances using wireless distribution. The final network is WMAN - wireless metropolitan area networks. a WMAN is a wireless network that connects several wireless LANs.

What is Wireless


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