Chapter 6 Deployment CPU 31x with TCP/IP Manual VIPA System 300V
6-8 HB130E - CPU - Rev. 11/50
Network planning
The main property of the bus structure is that it consists of a single physical
connection. The physical communication medium consists of:
• one or more electrical cables (twisted pair cable)
• coaxial cable (Triaxial cable)
• fiber optic cables
The applicable rules and regulations must be satisfied in order to establish
reliable communications between the different stations.
These agreements define the form of the data protocol, the method of
access to the bus and other principles that are important for reliable
communications.
The VIPA CPU 31xNET was developed in accordance with the standards
defined by ISO.
International and national committees have defined the following standards
and guidelines for networking technologies:
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
20MB/s. IEEE standards often form the basis for ISO-standards, e.g. IEEE
802.3 = ISO 8802.3.
General
Standards and
guidelines
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