Siemens X-400 ユーザーズマニュアル

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

139

 

 

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.