VIPA System 200V IM Series, Manual

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Manual VIPA System 200V
Chapter 8 Ethernet coupler
HB97E - IM - Rev. 06/29 8-7
Planning a network
The main characteristic of a bus structure is the existence of a single
physical transfer line. As physical transfer mediums are used:
•
one or more electrical cables (drilled cable)
•
coaxial cable (Triaxial cable)
•
fiber optic transmitter.
To enable the communication between the single stations, rules and
instructions have to be arranged and kept.
The appointments cover the form of the data protocol, the access
procedure to the bus and more basics for communication. The Ethernet
coupler IM 253NET from VIPA has been developed upon the ISO
standards and norms.
The following standards and norms about network technologies have been
fixed by international and national committees:
ANSI American National Standards Institute
The ANSI X3T9.5 standard currently defines the provisions for high speed
LAN’s (100 MB/s) based on fiber optic technology.
(FDDI) Fiber Distributed Data Interface.
CCITT Committee Consultative Internationale de Telephone et Telegraph.
Amongst others, this advisory committee has produced the provisions for
the connection of industrial networks (MAP) to office networks (TOP) on
Wide Area networks (WAN).
ECMA European Computer Manufacturers Association.
Has produced various MAP and TOP standards.
EIA Electrical Industries Association (USA)
This committee has issued standard definitions like RS-232 (V.24) and
RS-511.
IEC International Electrotechnical Commission.
Defines certain special standards, e.g. for the Field bus.
ISO International Organization for Standardization.
This association of national standards organizations developed the OSI-
model (ISO/TC97/SC16). It provides the framework for the standardization
of data communications. ISO standards are included in different national
standards like for example UL and DIN.
IEEE Institute of Electrical and Electronic Engineers (USA).
The project-group 802 determines LAN-standards for transfer rates of 1 to
20 MB/s. IEEE standards often form the basis for ISO-standards, e.g.
IEEE 802.3 = ISO 8802.3.
General
Standards and
norms