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Configuring Networks
3-14
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
Notes:
S Each further network component increases the PVV and reduces the remaining
cable length.
S When cascading OLMs and ELMs using twisted-pair cables, make sure that
you use a crossover cable (cable with XP identifier). This is available in lengths
from 2 to 100 meters. For further information and ordering data, refer to the
chapter “Passive Components for Electrical Networks”.
3.2.5 Combining OLMs and ELMs in a Bus Configuration
A combined OLM/ELM bus structure is also possible. This allows a connection
between an optical network and a triaxial network. The cascading depths that are
possible and the remaining cable lengths depend on the modules being used.
Please note that an interconnection on an OLM from optical fiber to TP produces a
higher delay equivalent and a higher variability value.
Example:
ELMOLM ELMOLMOLM OLMOLM
Node 1
Node 2
1. ITP standard cable 9/15
2. TP cord 9/RJ45
3. ITP XP standard cable 9/9
1
33
2
4. 727-1 drop cable
5. Triaxial cable
6. Fiber-optic cable (FO)
6
4
5
4
4
6
Figure 3-4 Example of a Combined OLM/ELM Bus Structure
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