Glossary - Siemens SCALANCE X-400 Operating Instructions Manual

Glossary

Aging time
Autocrossover
Autonegotiation
C Plug
CLI
Collision domain
Operating Instructions for SCALANCE X-400 Industrial Ethernet Switches
C79000-G8976-C186-03
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.
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.
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.
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.
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.
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.
139