Public WANs and Internet Access
To build the Internet, an Internet service provider (ISP) needs links to other ISPs and links to the ISP’s customers. The Internet core connects ISPs using a variety of high-speed technologies. Internet access links connect an ISP to each customer, again with a wide variety of technologies. For these customer access links, the technologies need to be inexpensive so that a typical consumer can afford to pay for the service.
Some WAN technologies happen to work particularly well as Internet access technologies. In fact, several use the same telephone line installed into most homes by the phone company so that the ISPs do not have to install additional cabling. Others use the cable TV cabling, whereas others use ...
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