SCALANCE X-100
Operating Instructions, 04, A2B00060666D
69
Glossary
Aging time
The aging time is the time after which a learned MAC address is discarded if a
SCALANCE X-100 has not received frames with this sender address during this time.
Autocrossover
Technique with which a TP port is automatically switched over between MDI and MDI-X
assignment to make a connection independent of the port assignment of the device being
attached. This means that crossover cables are not required. The autocrossover function
can only be used when the port is set to autonegotiation mode.
Autonegotiation
Procedure standardized by IEEE 802.3 in which the transmission parameters (for example
10/100 Mbps, full/half duplex) are negotiated automatically between the devices.
C-PLUG
The C-PLUG (configuration plug) is an exchangeable medium for storage of the
configuration and project engineering data. If the device is replaced, the configuration can be
adopted by swapping the C-PLUG.
CRC
Cyclic Redundancy Check. A checksum used in transmission protocols to detect errors in
frames.
Fault mask
Specifies the desired status (good status). Deviations from this occurring during operation
are handled as faults.
FO
Fiber optic; glass fiber cable
IRT
Isochronous Real Time supports applications with extremely high real-time requirements (for
example, motion control).
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