Siemens X-400 - Manual (Page 139)

Operating Instructions for SCALANCE X-400 Industrial Ethernet Switches
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Glossary
Aging time The aging time is the time after which a learned MAC address is dis-
carded if a SCALANCE X-400 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 cross-
over 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 pa-
rameters (for example 10/100 Mbps, full/half duplex) are negotiated
automatically between the devices.
C Plug The C-PLUG (configuration plug) is an exchangeable memory medium
of storing the configuration data. If the device is replaced, the configu-
ration can be adopted by swapping the C-PLUG.
CLI Command Line Interpreter. Terminal-based configuration option for the
SCALANCE X-400. The CLI can be used both over the serial port of
the Switch CPU and with TELNET over every Ethernet port.
Collision domain To ensure that the CSMA/CD protocol functions correctly, the propaga-
tion time of a data packet from one node to another is restricted. This
propagation time results in a spatially limited span for the network de-
pending on the data rate known as the collision domain.