CPU ADAM 821x
Chapter 4 Deployment of the CPU 821xNET
ADAM 8000 Manual CPU 821x – Rev 1.1
4-9
Standards and norms
The main property of the bus structure is that there is only one single
physical connection. The physical communication medium may be:
•
one or more electrical cables (drilled cores),
•
coaxial cables (triaxial cables),
•
fiber optic cables.
The applicable rules and regulations have to be satisfied in order to
establish reliable communications between the different stations.
These agreements define the form of the data protocol, the method of bus
access and other principles that are important for reliable communications.
The ADAM CPU 821xNET 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
LANs (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.
Standards and
guidelines
