Internet and online security - 83
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’ on each telephone socket to avoid
interference). To be eligible for DSL, you must be located near an DSL-
equipped phone exchange (service is 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.
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 internet while away from
home. The socket for a SIM card may be built in to your computer, or
may require an external device, such as a USB modem or even an
appropriately equipped mobile phone.
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.
