Industrial ETHERNET

outing, routers calculate rules and
parameters for path selection through
the network. This information is written
to routing tables and exchanged using
routing protocols between routers.
This ensures that the path selection is
adapted to the current topology and
load distribution of network. In dynamic
routing, each telegram is individually
routed. As a result, telegrams may arrive
at the receiving end in a sequence
different to the one in which they were
sent. In static routing, the paths for data
transmission between the transmitters
and receivers is fixed and a specific
bandwidth is reserved for each connection.
As a result, data packets take the same
path between two terminal devices.
It is therefore not possible to respond
automatically to changes in the topology
or in the case of overloads of connections.
Since all changes in the network
structure are entered into the routers
by hand, routers do not have to support
any routing protocols in this process.
While dynamic routing supports the
transmission of data in an optimized
manner, in static routing, the transmission
of data, speech and video are equally
supported.
RSVP
RTCP
RTP
Rx
standardized by the EIA in the 70s by
the EIA as standard no. 485.
Resource Reservation Setup Protocol
A protocol that reserves resources for
applications over the Internet. After
a path has been established from the
sender to the receiver, all the routers
participating in this path are notified via
RSVP that they should reserve specific
resources for this connection.
Realtime Transport Control Protocol.
Real-Time Protocol
A protocol that supports real-time applications
such as video conferencing on
the Internet. In this protocol, additional
information such as the nature of the
payload data transmitted (speech, video,
etc.) or the time of generation of the
payload data is transmitted.
Abbreviation for Receiver.
Term for the connection to a port at
which data is received.
Routing
Protocol
RS 232 C
Term for protocols that routers use
during dynamic routing in order to
exchange information over connected
networks amongst each other. This
information is stored in routing tables in
the routers.
Recommended Standard 232 C
A widely used serial interface for data
transmission with data rates of up
to 20 kbit/s and over distances up to
15 m. This interface was standardized
by the EIA in 1969 as standard no. 232
in Version C. It is also often referred to
as RS 232.
SA
SAN
SAP
Source Address
Source address within a data telegram.
Storage Area Network.
Network for connecting servers and
storage sub-systems, such as disks,
RAID and Tape Systems. Mostly based
on Fibre Channel.
Service Access Point
Term for the interface between two
layers of the OSI reference model where
a layer that is placed at a higher level
makes use of services in the layer below.
RS 422 Recommended Standard 422
A serial interface for data transmission
in full duplex operation. This interface
was standardized in the 70s by the EIA
as standard no. 422.
SC
Straight Connector
A widely used plug connector for fiber
optic cables. Also see DSC.
RS 485 Recommended Standard 485
A serial interface for data transmission
that enables a bus structure with
several partici-pants. This interface was
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