Glossary
161
DSL modem
A DSL modem connects a computer to the Internet via the DSL
line. In contrast to the analog modem, a connection via the
DSL modem does not mean that the telephone line is busy.
DSL router
A DSL router generally combines three different devices: a
DSL modem (
), a router, and a LAN switch.
A DSL router serves, first, to connect multiple computers or
other network devices together to form a local network (LAN)
so that the devices can exchange data with each other.
Second, a DSL router provides a central Internet connection
that can be used by all devices in the home network at the
same time. The DSL router’s job is to control the data traffic
between the local network and the Internet. If the DSL router
is equipped with a firewall (
), it protects the de-
vices in the home network against attacks from the Internet.
DSL splitter
A DSL splitter is a device that separates telephone and DSL
signals.
You need a DSL splitter if you have a fixed line (
and a DSL line. The splitter separates the telephone and DSL
signals, which use the same cable to access your house or
apartment. The splitter conducts telephone signals to your
analog telephones or to the NT. DSL signals are sent on to the
DSL modem or DSL router.
dynamic IP address
A dynamic IP address is an IP address valid only for the dura-
tion of one Internet or network session.
Every computer participating in the Internet must have a
uniquely assigned public IP address. Since only a limited
number of such IP addresses is available, they must be used
sparingly. That is why most of the Internet participants who
dial in to the Internet receive a dynamic IP address. They are
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