Table 5-3 Specification of fiber-optic cables for outdoor applications
Cabling Components required Specification
A cable junction is required be‐
tween the indoor and outdoor
area
● Installation cables
for
outdoor applications
Installation cables for outdoor applica‐
tions:
● 1 cable with 4 cores per fault-tolerant
system
Both interfaces in one cable
● 1 or 2 cables with several shared
cores
Separate installation of the interfaces
in order to increase availability (reduc‐
tion of common cause factor)
● Connector type ST or SC, for exam‐
ple, to match other components; see
below
Further specifications you may need to
observe for your plant:
● UL approval
● Halogen-free materials
Further specifications that may apply due
to the local conditions:
● Protection against increased mechan‐
ical stress
● Protection against rodents
● Water-proofing
● Suitable for direct underground instal‐
lation
● Suitable for the given temperature
ranges
Avoid splicing cables in the field. Use pre‐
fabricated cables with pulling protection/
aids in whiplash design, including meas‐
uring log.
● if necessary, instal‐
lation cables also for
the interior area
● 1 cable with 4 cores per fault-tolerant
system
Both interfaces in one cable
● 1 or 2 cables with several shared
cores
Assembling
5.2 Selecting fiber-optic cables
Synchronization modules for S7-400H
Equipment Manual, 04/2020, A5E50072434-AA 19
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