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CHAPTER 12

PLC for Communities

During the last years, high throughput Internet accesses proposed by Internet access

providers have spectacularly developed, providing both higher throughputs and

new media to reach an increasing number of customers (telephone cable, TV cable,

radio, and so forth).

Within this framework, and more especially in some countries throughout the

world, the electrical network seems to be promising to convey the Internet signal as

close as possible to the terminals wanting to connect by means of all the outlets of a

building or apartment.

Using the public electrical network as the communication medium, and espe-

cially as the medium for the broadcasting of the Internet signal to the final custom-

ers has the obvious advantage that the electrical network is present everywhere.

However, using this medium first of all designed for conveying and distributing the

electrical signal as the telecommunications medium requires some precautions.

This chapter details the constraints and the chosen devices used for implement-

ing a PLC network up to each user of the electrical network of a community. The

installation of this type of infrastructure has already been implemented by some

telecommunications operators.

Electrical Networks for Communities

As we have seen in the preceding chapters, the electrical networks in the broad sense

can be considered as several subnets connected to each other with various voltage

levels, various responsibilities, various managers, and various security levels.

As a first example, these subnets are regulated in the USA by the FERC and in

France by the CRE (Commission de régulation de l’électricité) from the EHV

(extra-high voltage) lines running across the country to connect the major electricity

production sites to the various communities to the outlets in the buildings (houses,

companies, and so forth) in order to supply the electrical devices that we use every

day.

Figure 12.1 diagrammatically represents these various subnets, with their

respective voltage levels and the associated line types, as well as their connection to

the private electrical network downstream of the meter used for electrically con-

necting a building to the public network. The network of a community extends

from the HV/MV transformer to the meters of the community buildings.

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ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación Pagina 292