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3.5
Connecting
to the Internet (WANs)



3.5.7
Cable
modem versus DSL Internet technologies





When it comes to comparing cable modem and
DSL Internet technologies both have their pros and cons. DSL service
can be added incrementally in an area. This means that the service
provider can upgrade the bandwidth as the subscriber base grows. DSL
is also backward compatible with analog voice and makes use of the
existing local loop. This means that the DSL service works
simultaneously with normal phone service. However, DSL suffers from
distance limitations since most DSL services currently require the
customer to be within 18,000 feet of the provider's central office
location. Additionally, the longer and older loops present problems,
and the best form of voice support is still being debated. Also, the
upstream (upload) speed is usually considerably slower than the
downstream (download) speed.
Conversely, cable modem technology presents plenty of relatively
inexpensive bandwidth. The downstream and upstream Internet channels
are seen as just another premium TV channel by the system. This is a
major advantage, especially when hosting a web server or FTP server,
which involves upload-intensive Internet tasks. The use of fiber
(hybrid-fiber-coax or HFC) solves some of the service shortcomings
initially encountered with this technology. Unfortunately, the cabling
infrastructure needed to support cable modem technology has been slow
to be upgraded so most homes in the United States cannot use this
technology. Upgrading is a big investment particularly for small
providers. Figure
lists the
advantages and disadvantages of using a bus topology.
  









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