TAILIEUCHUNG - The PC Doctor's Fix-it-Yourself Guide- P40

The PC Doctor's Fix-it-Yourself Guide- P40: A technical director for a UK-based computer company who teaches such courses as Caring for Your PC has developed prescriptions for treating sick PCs. Arguing the benefits of fixing it yourself rather than relying on experts, his mission is to empower users with trouble- shooting and safe repair skills. | Chapter 19 Making More of the Internet 390 The PC Doctor s Fix-It-Yourself Guide The Internet offers you much more than just the vast repository of information held in web pages that is the World Wide Web. The Internet is much much more. It is about easily connecting and sending information to other users on the Net in a variety of ways. If you are on the Internet you should find yourself making fewer phone calls and sending fewer letters and faxes a move that means your communications with others will not only be faster but also much cheaper. But before you can make use of the Internet you need to be able to connect and the two main issues that affect Internet users are either being unable to connect or being prematurely disconnected. If you can t connect to the Internet you can t make use of any of the resources it offers. So let s take a look at some of the issues that can affect your connectivity. We ll divide connectivity into two sections depending on whether you have a dial-up connection using a modem or an always-on DSL connection. Connectivity Modem Dial-Up When you connect to the Internet using a modem see Figure 19-1 your computer is making a phone call to a computer run by your ISP Internet service provider which is then used to connect you to the Internet as a whole. There are several points along this connection that may cause you trouble some which are within your control and some that are way outside of your control. Let s begin by looking at the things that are outside of your control. Phone Line Quality When you are using the telephone line to connect to the Internet you are using technology that was invented well before the computer and designed purely to carry voices to make a high-tech connection to other computers. The actual quality of the phone line plays an important part in the connectivity equation. Because your connection relies on sending and receiving audible computer signals to and from your PC to the ISP s computer any noise or .

Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.