Web site developers - Figure 9-1:A modem and ISP provide your computer s
Figure 9-1:A modem and ISP provide your computer s connection to the Internet. Your ISP might be MSN, America Online, Comcast, Juno, or any of several hundred other companies. In a sense, it really doesn t matter, because there is only one Internet. ISPs all basically work the same way. They rent a largeamount of bandwidth, say $10,000 or $100,000 a month worth. The lightningbolt in Figure 9-1 represents that expensive high-bandwidth connection. TheISP sells smaller chunksof that bandwidth to lots of customers, with the intentof making a profit. What Is Bandwidth? Bandwidth, measured in kilobytes per second (Kbps or Kb), is a measure ofhow much information at a time can be sent through the line that connectsyour computer to your ISP. For example, a dial-up account tops out at about 48 to 50 kbps. That s roughly 48,000 to 50,000 bits per second (bps). Thatsounds like a lot. Since any given file can contain millions of bits, however, it s really not that fast. The lower the bandwidth, the longer the wait for things you ve requested fromthe Internet. For consumers, accounts generally cost anywhere from $10.00 to$20.00 a month for a 56K dial-up account, to maybe $30.00 or $40.00 a monthfor a broadband connection. Here s the difference: .Dial-up:Connection to your ISP goes through a standard modem andtraditional telephone lines. (Your phone line is busy if anyone tries tocall while you re online.) The maximum speed of a dial-up account isusually in the 48 to 50 Kbps range. Even though your modem may berated at 56K, the phone lines can t move traffic quite that quickly. .Broadband:Connection to your ISP is through cable (the type usedby cable TV companies), or special Digital Subscriber Lines (DSL) owned by the phone companies, that can move data at faster than 50 Kbps. You connect to a broadband account using a modem orrouter. You can get just about any connection speed you want. ISPModemYourComputerInternet164Part
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