Industrial ETHERNET

Industrial ETHERNET Lexicon
different to the one in which they were
sent. TCP is responsible for assembly in
the correct sequence.
IP Address The address of a participant on Layer 3
of the OSI reference model. In Version 4,
an IP address consists of 4 bytes
separated from each other by decimal
points. These 4 bytes indicate the
address for the network (Net ID) and the
address area of the terminal devices
(Host ID). The entire address range is
classified into classes from A to E in
accordance with the number of network
addresses and host addresses, the
number of host addresses becoming
increasingly smaller from A to E. Since
IP addresses must be unique on the
Internet, the network addresses are
managed by a central organization. The
allocation of host addresses is done
by the administrator of the respective
local network. In order to split-up local
networks into smaller subnetworks that
are easier to manage, part of the host
addresses is used. The network address
is thereby increased with a subnetwork
component. This extension is done
using a subnetwork mask. The subnetwork
mask marks all the bits of an
IP address that identify the network and
subnetwork. A device that wants to
transmit, compares its IP address with
the IP address of the receiver. If the
addresses do not match within the
framework of the network mask, it
means that the receiver is in a different
network. In such case the message is
sent to a gateway or a router.
IPv6 Internet Protocol version 6
The IPv6 has an address length of 16
bytes. In addition, it is also differentiated
by the structure of the header and the
division of the networks into address
types rather than classes.
IPsec
Internet Protocol Security
Standard, which uses encryption to verify
the authenticity of the sender and
ensure the confidentiality and integrity of
the data in IP. Layer 3 VPNs connections
are configured with IPSec (using 3DES
for instance).
IPX
Internetwork Packet Exchange
Term for a protocol by Novell that creates
connections to Internet protocols.
ISDN
Integrated Services Digital Network.
WAN communication protocol.
ISO
www.iso.org
International Standards Organization
An umbrella organization of national
standardization committees that is also
a member of the Deutsches Institut
für Normung (DIN, German Standards
Institute). More than 200 technical
committees (TC) make up the various
bodies of the ISO. The TCs may
be subdivided if so required into subcommittees
(SC). The SCs in turn may
be split up into working groups (WG)
and special task groups.
ISP
Internet Service Provider.
IT
Information Technology
ITU-T
www.itu.int
International Telecommunications
Union-Telecommunication
Standardization committee with its head
office in Geneva.
IPv4 Internet Protocol version 4
The IPv4 has an address length of
4 bytes. Also see IP.
Jabber
Jitter
Term for an ETHERNET packet with
more than 1522 bytes.
Term for the oscillation of signal edge
in time.
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