ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación descargar pdf (Pagina 22)

A “standard” is a document from any national body, such as the IEEE (USA), or

from a Community of States, such as ETSI. To make the difference, it is sometimes

called “de facto standard.” We will call it “specification.”

To give a simple description of the conditions to be fulfilled by a standard, we

refer to the definition given by ISO:

“Any document designed for a repetitive action,

and approved by an acknowledged standardization body and being at everybody’s dis-

posal.” It is the result of a consensus.

Depending on the geographical areas, standardization work may be directly

associated with an international level or first be developed at a regional level.

In Europe, standardization is carried out at national, European, and interna-

tional levels. Each standardization committee is responsible for one or several stan-

dardization fields.

There are three international organizations that cover all the fields of knowl-

edge: the IEC, the ISO, and the ITU.

The IEC (International Electrotechnical Commission) and Cenélec (European

committee for electrotechnical standardization) are in charge of electrical engineer-

ing and the ETSI (European Telecommunications Standards Institute) is in charge of

telecommunications.

The ISO and the CEN (European Committee for Standardization) cover all the

other areas of activity.

The harmonized international standard terms are used in the background of

so-called new approach European directives to designate European international

standards adopted according to the general directions agreed upon between the

European commission and the standardization bodies within the framework of a

mandate granted by the commission after consultation with the member states.

Figure 1.2 illustrates the fields of activity of each standardization committee in

charge of PLC technologies.

It must be noted that this regional level (here, the region is Europe) does not seem to

exist explicitly in other parts of the world (Asia, the East, and so forth).

PLC Technologies 3

Figure 1.2 Standardization bodies in charge of PLC technologies

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ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación Pagina 22