Glossary
Fault Mask
Definition of a desired status (good status); deviations from this status during operation are
considered as errors/faults.
FO
Fiber optic
Monomode
The monomode fiber (also single-mode fiber) typically has a core diameter of 5 to 9 µm.
However, the outer diameter is also 125 µm. The actual transmission of the information takes
place in the core of the fiber.
Multicast
A frame with a multicast address is received by all recipients which are ready for receiving
this address.
Multimode
In multimode transmission, the pulse is transferred using many modes (waves) which travel
along curved paths or which are reflected within the core. Attenuation is mainly caused by
physical absorption and dispersion as well as by mechanical bending. Among other things,
the amount of attenuation depends on the wavelength of the input light. Multimode fiber-optic
cables have an outer diameter of 125 µm and a core diameter of 50 or 62.5 µm. Due to the
larger core diameter, the pulse edges degrade more than in single mode transmission, which
results in shorter transmission distances.
OSM
Optical Switching Module – SIMATIC NET Ethernet switch with optical ports.
Industrial Ethernet Media Converters SCALANCE X-100 Series
Glossary-2 Commissioning Manual, 07/2008, A2B00051521A
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