Industrial ETHERNET

Network access
Network member
ready to transmit
no
Transmission medium
available?
yes
Wait as determined
by backoff strategy
Start to
transmit data
Transmit
jam signal
CRC
Cyclic Redundancy Check
Term for algorithms that are used for
error detection and correction of bitoriented
protocols.
no
Collision?
no
End of
transmission?
yes
Terminate
network access
yes
CSA
www.csa.ca
Canadian Standard Association
cUL 508
US standard for the security of industrial
control equipment.
CSA-
Canadian standard for the security of
C22.2 No. 950 IT devices, including electrical office
machines based on the IEC 950.
CSA-
Canadian standard for the safety of
C22.2 No. 142 industrial control equipment, based on
UL 508.
CSA-
Canadian standard for electrical
C22.2 No. 213 operating equipment for explosionendangered
rooms of the Class I
and II, Department 2, and Class III;
based on UL 1604.
CSMA/CD Carrier Sense Multiple Access/
Collision Detection
Access process in ETHERNET as per
IEEE 802.3. A station ready to transmit
checks whether the transmission
medium is free (carrier sense). It then
starts transmitting while simultaneously
checking whether other stations (multiple
access) have also started to transmit
data. If 2 or more stations transmit
simultaneously, there is a collision. The
stations stop transmission accordingly
(collision detection) and attempt transmission
later on. In the CSMA/CD
process, the network expansion is
determined by a maximum permissible
runtime of data signals on the network
that depend on the data rate.
cUL 1604
cUL 60950
Cut Through
DA
DBPSK
US standard for electrical operating
equipment for explosion-endangered
rooms of the Class I and II, Department 2,
and Class III; based on UL 1604.
US standard for the safety of IT
equipments including electrical office
machines; based on IEC 950.
Method of working of switches in
which a data packet is immediately
relayed further after detecting the target
address. The delay time (latency time)
is thereby small, but wrong packets are
also transmitted onward. In this process,
it is not possible to adjust the speed
between the individual segments. The
phenomenon is also called “On-the-Fly-
Switching”.
Destination Address
Target address within a data telegram.
Differential Quaternary Phase Shift Keying
DBPSK is a modulation procedure of
which is used with the DSSS transmission
method according to standard
802.11 for systems with 1 Mps.
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