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90 - Internet and online security
Dial-up
Some computers include a telephone dial-up ('modem')
connector. This allows you to connect to the internet using
your telephone line. With a dial-up connection, you cannot
use the modem and the telephone simultaneously on a
single phone line. This type of connection is recommended
only if you have limited use of the internet as the connection
speed is low and connection time is typically charged per
hour.
DSL (e.g. ADSL)
DSL (Digital Subscriber Line) is an 'always-on' connection
that runs over the phone line. As DSL and phone do not use
the same frequencies, you can use your telephone at the
same time you are connected to the internet (this requires a
'micro-filter'
interference). To be eligible for DSL, you must be located
near
an
sometimes unavailable in rural areas). Connection speeds
vary depending on your location, but DSL generally provides
very fast and reliable internet connection. As the connection
is always-on, it is generally charged at fixed monthly rates.
Note
A DSL connection requires an appropriate modem. A modem is
usually provided by the ISP when you register. Many of these
modems include an 'router' that provides network and Wi-Fi
access.
Cable
A cable connection provides fast and always-on internet
service via a cable television line. This service is generally
available in large cities. You can use your telephone and
watch cable TV at the same time you are connected to the
internet.
Cellular
A cellular connection allows you to use cellular networks
(such as those used by a mobile phone) to connect to the
on
each
DSL-equipped
telephone
socket
phone
exchange
to
avoid
(service
is
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