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Glossary
Monomode
See Single mode
Multicast
A frame with a multicast address is received by all nodes prepared to receive this address.
Multimode
In multimode transmission, the pulse is transferred using many modes (waves) that travel
along curved paths or are reflected within the core. Attenuation is mainly caused by physical
absorption and dispersion as well as by mechanical bending. The amount of attenuation
depends among other things on the wavelength of the input light. Multimode fiber-optic
cables have an outer diameter of 125 µm and 50 or 62.5 µm core diameter. Due to the larger
core diameter the pulse edges degrade more than in single mode transmission resulting in
shorter transmission distances.
Power over Ethernet
Complying with the method standardized in IEEE802.2af for supplying power to end devices
over Ethernet cables.
Reconfiguration time
The time required to restore a functional configuration if a device fails or a network cable is
interrupted.
Redundancy manager
Network node in a ring topology that does not forward any frames between its ring ports if
there are functioning connections between all other nodes. As soon as a connection
between two nodes is interrupted, the redundancy manager forwards frames so that there is
an intact connection between all nodes.
Segment
In the Ethernet bus system, transceivers connected together over the bus cable along with
the nodes connected over patch cables form a segment. Several such segments can be
connected via repeaters. When using twisted pair and fiber-optic cables, each subsection
forms a segment.
Signaling contact
Floating relay contact over which detected fault/error states are signaled.
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SCALANCE X-100
Operating Instructions, 04, A2B00060666D
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