Glossary - Siemens SCALANCE X204RNA Operating Instructions Manual

Glossary

Aging time
The aging time is the time after which a learned address is discarded if a SCALANCE X-
200RNA 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 crossover 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 parameters (for example
10/100 Mbps, full/half duplex) are negotiated automatically between the devices.
BOOTP
A protocol for automatic assignment of IP addresses. The IP addresses are provided by a
BOOTP server
CLI
Command Line Interface. Terminal-based configuration option for SCALANCE. The CLI can
be used via an Ethernet connection.
C-PLUG
The C-PLUG (configuration plug) is an exchangeable medium for storage of the
configuration and project engineering data. If the device is replaced, the configuration can be
adopted by swapping the C-PLUG.
CRC
Cyclic Redundancy Check. A checksum used in transmission protocols to detect errors in
frames.
DCP
DCP (Discovery and basic Configuration Protocol) is used to detect nodes without an IP
address and to assign a basic configuration to them, for example IP address.
SCALANCE X204RNA SCALANCE X204RNA EEC
Operating Instructions, , C79000-G8976-C294-03
(PRP)
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