Glossary
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By now many other devices also have a USB port. For in-
stance, many DVD and Blue-ray players can play back photo-
graphs, videos and music directly from a USB storage medi-
um (hard drive, flash drive).
The Universal Serial Bus supports hot plugging. This means
that USB devices can be connected without turning the com-
puter off. The Universal Serial Bus also offers a 5-volt power
supply. This makes it possible to load devices at the USB port
and operate USB devices that do not have a power supply of
their own.
The Universal Serial Bus was introduced with the USB 1.0
specification in 1996. In 1998 came the reworked USB 1.1
specification, followed in 2000 by USB 2.0. With 480 Mbit/s,
USB 2.0 provides for considerably higher throughput rates
than USB 1.0/1.1 (12 Mbit/s).
VDSL
short for Very High Speed Digital Subscriber Line
In Germany, the DSL technology VDSL is increasingly becom-
ing available in the VDSL2 (G993.2) version. VDSL2 is a fur-
ther development of the ADSL2+ standard, to which it is fully
downward compatible. The standard provides for throughput
rates of up to 100 Mbit/s for uploading and downloading, but
requires a distribution network with a more closely meshed
infrastructure—a demand that is hardly economical outside
of major urban areas.
VoIP
short for for Voice over IP, also known as Internet telephony
Calls from the Internet are possible to and from the fixed-line
network and mobile networks. Various Internet Service Pro-
viders and telephony carriers provide SIP-fixed-line gateways
for this purpose. The gateways are used to produce voice con-
nections between the Internet and conventional telephone
networks.
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