Operating instructions

Glossary
Glossary-2
SIMATIC NET Twisted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
Backbone
The network at the highest level of a hierarchically structured plant network.
Bandwidth length product (FO)
Measure of the capability of a fiber-optic cable to transfer at high data rates.
Bridge
A network component that interconnects network segments. This ensures that
local data traffic remains local, in other words only data packets for a node in the
other segment are forwarded through the bridge. Errors in a network segment
are restricted to the original network segment. In contrast to switches, bridges
can only forward one data stream at any one time.
Burst
Temporarily increased network load due to data burst or a sudden flurry of
signals
Bus
Common transmission path on which all nodes are connected; it has two defined
ends.
In Industrial Ethernet, the bus takes the form of a segment with triaxial cable and
transceivers.
Bus segment
³ Segment
Bus system
All stations that are physically connected via a bus cable form a bus system.
Category x component
Cabling components are divided into various categories based on their
transmission characteristics. Each of the categories has different physical limit
values (for example maximum signal attenuation at a defined transmission
frequency).
Category 3: Data transmission up to 16 MHz
Category 4: Data transmission up to 20 MHz
Category 5: Data transmission up to 100 MHz
Category 6: Data transmission up to 200 MHz
ITP standard cable and TP cord are category 5 components and suitable for
transmission rates of 10 Mbps and 100 Mbps.