ABB AC 800M User Manual page 50

Basics of fibre optics topology technologies
Star Topology
In a star structure several optical link modules are combined to form an active
PROFIBUS star coupler. Further optical link modules are connected to this by dual-
fiber optical fiber lines (transmit/receive fibres). The modules of the star coupler are
connected to one another via the electrical port (electrical star segment). Optical link
modules for different fiber types (plastic, PCF, glass) can be combined using the
electrical star segment.
Figure 11. Network structure in an optical star topology
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Section 2 Transmission Technology
3BDS009029R5001 B