Brochure/Catalogue

Interest in Industrial Ethernet has produced an entirely new
dictionary with specialist terms. Some of the most important
terms are briey explained here.
4B/5B
A block encoding system for FDDI and ATM. In 4B/5B
encoding, all data is divided into 4-bit units (a nibble) and
converted to 5-bit units (symbols) by reference to a matrix.
100BaseFX
100 Mpbs Fast Ethernet, based on 4B/5B encoding with
bre optics.
100BaseSX
100 Mbps Fast Ethernet system, identical to operations in
the 100BaseFx, but 850 nm bre-optic technology is used.
100BaseTX
100 Mbps Fast Ethernet system based on 4B/5B encoding
and transmission via two copper cables.
100BaseX
This term is used to describe Fast Ethernet technologies
based on the 4B/5B encoding. Includes 100BaseTX and
100BaseFX systems.
Gigabit-/10 Gigabit Ethernet
For particularly high data transfer requirements there is
Gigabit-Ethernet and 10 Gigabit Ethernet, both are still the
exception in the industrial sector, however, development is
moving in this direction due to the increasingly high data
volumes.
802.3.IEEE
The CSMA/CD group is the oldest working group in the 802
project. It denes the norms according to the CSMA/CD
access procedures proposed by the DIX-group. The focus of
this working group is on high-speed protocols.
AUI
Stands for “Attachment Unit Interface”. Interface between
the transceiver and the network board.
Auto-negotiation
Auto-negotiation means automatic recognition of the
opposite end’s functions. By using RJ45 plugs for the
different protocols, from 10Base-T to 100Base-T, a
compatibility problem occurs which is solved due to
automatic recognition of the opposite end. Using the
auto-negotiation procedure, repeaters or terminal equipment
can determine what functions the other end has, so that
different devices can be congured automatically.
Bandwidth
Bandwidth states how much information can ow within a
set period from one location to the other. Units: Bps, Kbps,
Mbps, Gbps.
Baud
Baud is the unit of step speed. A step always lasts for a
pre-set time e. g. 1 bit, 1_character. If you multiply the
number of bits per state with the baud rate you obtain the
transmission speed. Only if the number of states is exactly
two (i.e. encoding was carried out at a state of exactly 1 bit),
is the baud rate exactly the same as the bit rate.
Bit
Bit is an articial word made up of binary and digit and
constitutes the smallest unit of digital information, either a
0 or a 1.
Bitrate
Bitrate is also referred to as transmission speed, transmission
rate or data rate. It is the number of bits that are transmitted
per unit of time (typically one second). The bitrate is stated in
Bps (bits per second) or in the appropriate powers of 10 as
Kbps, Mbps and Gbps. In American English the abbreviation
Bps is used.
Blowsh
In the digital information age, the handling of sensitive
data is becoming ever more important. Therefore, we have
incorporated Blowsh, a symmetrical encryption algorithm,
into the software of our routers in order to guarantee a
secure link between a pair of Weidmüller routers.
Bridge
According to their OSI denition, bridges connect sub-
network protocols on layer 2 of the OSI reference model.
Broadcast
A broadcast transmission is a simultaneous transmission
from one point to all network stations.
Bus
Buses are connection systems for electronic and electrical
components. The topology of a bus is always a physical
medium which the individual components are connected to
and which is terminated at both ends. Transmission on a bus
can be done bit or byte parallel, as in the PC-bus, or serially,
as for networks in bus topology.
Glossary
Specialist vocabulary for Industrial Ethernet
Glossary
W
Technical appendix
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