Specifications

Glossary
SCALANCE X-400 BA
154 Operating Instructions, 03/2009, C79000-G8976-C186-07
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.
Spanning Tree
The Spanning Tree protocol (STP) allows redundant transmission paths. This prevents
circulating frames and, if a fault develops, provides an alternative path within 20 - 30
seconds (reconfiguration time).
Store and forward
In this switching technique, the entire frame is read in, before it is forwarded by the switch. A
packet is only passed on if 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 port
Port with a TP connector (RJ-45 jack)
VLAN
Virtual LAN within a physically existing network.