Comparisons of WAN Links, Frame Relay, and the Internet
|
WAN Type |
Generic Name of
Provider |
Physical Connectivity |
Description of
Service |
|
WAN link (leased line) |
Telco |
4-wire cable from customer to telco CO at each site |
Telco forwards bits between two sites |
|
Frame Relay |
Frame Relay service provider |
4-wire cable from customer to telco CO at each site |
Provider forwards frames, based on DLCI, to one of many
possible sites |
|
Internet |
Internet service provider |
Either WAN link or Frame Relay between customer and
ISP |
ISP routes IP packets to any IP host on the
Internet |
The rest of this chapter covers three popular technologies that
are most often used today to connect to an ISP. Most of the time, people use
these technologies at their homes. One of the main distinctions is that these
three technologies take advantage of cabling that is typically already installed
into a home, namely the phone line, or the cable TV cable. By using cabling that
is already installed in the home, an ISP spends less money, making the service
cheaper to the customer. Also, the time required getting the customer up and
working can be reduced.
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