Siemens X-400 Glossary, Aging time, Autocrossover, Autonegotiation, Collision domain

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.

Operating Instructions for SCALANCE X-400 Industrial Ethernet Switches	139
C79000-G8976-C186-03