Access the Inter-
net via separate modem. there are now number different
systems, these devices must have selective protec-
tion.2.3 Telecommunications
Today, telecommunications are used all kinds dif-
ferent applications. Telecom-
munication means the transmission, over substantial
distance, any kind information via technical infra-
structures. Because the analogue
connection without technical accessories provides
only one channel, the Internet cannot accessed
while telephoning and likewise, telephone call is
possible while surfing.g.
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Chapter The internal lightning protection system
. There are three distinctly different essential sys-
tems.
Standard analogue connection
Unlike other systems, the standard analogue connec-
tion offers additional services. This enables the user surf the Internet
while telephoning and higher data rates than pos-
sible with the analogue connection (64 kBit/s over
one channel). Many people associate the term
“telecommunications” only with the traditional tele-
phone, but the spectrum much broader.Protection ISDN DSL connection with TeleDefender
3.3.
ISDN
(Integrated Services Digital Network System)
In contrast the analogue connection, ISDN allows
two conversations take place the same time via a
special bus system (S0 bus), which provides two
channels.
the Internet.
Telephone systems
In many cases, modern telephone systems also act as
interfaces for number different data services, e. ISDN also offers other services such as
call waiting, callback, etc. That includes everything from high-speed
transmissions via optical fibre sending simple fax. Many terminal devices that enable this ac-
cess are connected into the lines themselves and
must integrated into the surge protection concept
accordingly
