Siemens X-400 Manuel d'utilisateur télécharger pdf (Page 139)

Operating Instructions for SCALANCE X-400 Industrial Ethernet Switches

C79000-G8976-C186-03

139

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.

1 2 ... 134 135 136 137 138 139 140 141 142 143 144 ... 147 148

Pas de commentaire

Siemens X-400 Manuel d'utilisateur Page 139