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Glossary
SCALANCE X204RNA SCALANCE X204RNA EEC (PRP)
Operating Instructions, , C79000-G8976-C294-03
127
Single mode
In single mode transmission, (and monomode transmission) the pulse is transmitted by a
straight mode (wave). Attenuation is mainly caused by physical absorption and dispersion as
well as by mechanical bending. The amount of attenuation depends, among other things, on
the wavelength of the input light. The single mode fiber typically has a core diameter of 5 to 9
µm. The outer diameter is, however, once again 125 µm (compare multimode). The smaller
core diameter degrades the pulse edges less than multimode transmission and allows
greater transmission distances.
SNMP
Simple Network Management Protocol. Standardized protocol for transporting network
management information.
SNTP
Simple Network Time Protocol
Protocol for time synchronization over networks.
SSH
Secure Shell. This allows an interactive connection to be established to another device in the
LAN or on the Internet. Otherwise, the functionality corresponds to that of Telnet.
SSL
Secure Socket Layer. This protocol allows encrypted exchange of data with a server. There
is also secure authentication of the server. For communication with a server over SSL, the
server must have a certificate and a corresponding private key.
Store and forward
An entire frame is received, its validity checked (checksum, length etc.) and then buffered.
Invalid frames are discarded, in other words, a frame is forwarded only when it is error-free.
TELNET
With this protocol, an interactive connection can be established to another device in the LAN
or on the Internet. The user then has the same options as when directly connected to this
device with a terminal.
TP
Twisted Pair