Glossary
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ADSL2+ offers a doubled frequency range used for down-
stream transmission, and thus double the maximum band-
width achievable for downstream to 24 Mbit/s.
ADSL2+ is completely downward compatible, meaning that
terminal devices compliant with ADSL and ADSL2 can also be
operated on ADSL2+ lines, although they cannot exploit the
advantages of ADSL2+.
cable modem
A cable modem is a device that transmits data over cable tele-
vision networks. It is used integrate broadband Internet con-
nections over cable connections (cable Internet). The cable
modem is located between the cable connection and the
Internet router at the customer’s premises. The computer is
connected either via LAN or the USB port. Some cable mo-
dems are combined with a WLAN access point that establish-
es a radio connection to the computer.
DDNS
short for Dynamic Domain Name System
DDNS is a service which allows a computer always to be
reached under the same domain name despite constantly
changing public IP addresses. This means the home network
can always be reached from the Internet, regardless of the us-
er’s location. Even private users have an economical way of
placing their own Internet offers on their computer at home.
Every time the Internet connection is established, the Internet
Service Provider assigns a new public IP address.
Each time the IP address changes, the current IP address is
transmitted to a special DDNS server. Except for the few sec-
onds between the cancellation of the old IP address and the
notification of the new IP address, the computer can always
be reached at the selected domain name.
default gateway
gateway (see glossary)
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