Here, too, fibre optic technology used the
transfer medium.
2.
3. Secondary cabling
The secondary cabling connects the individual floors
of the building with one another (vertical). Primary cabling can character-
ised long cable lengths due the locations dif-
ferent buildings. The connection point the build-
ing distributor (BD). The speed the connection also
plays important role.
Lightning and surge protection measures should be
installed ensure that this infrastructure remains free
from faults and not destroyed powerful currents. However, the most wide-
spread option the classic connection via Twisted
Pair cable. This
offers higher data rates than conventional copper
cables and also less susceptible interference
from electromagnetic impulses.
Where building fitted with external lightning pro-
tection, lightning currents and surge volt-
ages pose particularly high risk. fibre-to-
the-desk, the floor distributor and terminal device are
linked fibre optic cable.
Various transmission media are used here.
In buildings with external light-
ning protection system, internal
protection against partial lightning
currents and surge voltages is
needed.
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Chapter The internal lightning protection system
. The floor
distributors are directly linked the building distribut-
or and, the same time, offer connection opportunit-
ies for the various terminal devices/connections sock-
ets. Tertiary cabling
In tertiary cabling, fibre optic cables can used as
the transmission medium alternative copper
network cabling. For fast transmission rates to
be achieved, fibre optic technology often used as
the transmitting medium the primary cabling.structured cabling, the cabling divided into three
subsections:
1. Primary cabling
The primary cabling for connecting building com-
plexes (horizontal). The tertiary cabling the cabling that
links terminal devices/connection sockets with floor
distributors within floor the building (horizontal). the separation
distance (s) not maintained, there risk arcing
from the external conductor system onto internal
cables running along the building wall, for example in
dado trunking
