ZyXEL Communications PLA-470 V2 - V3.0.5 Guia de Instalação descarregar pdf (Página 315)

PLC Technologies Between Themselves

As we have seen throughout this book, there is no IEEE PLC standard as yet. As a

result, a number of PLC technologies coexist on the public and private electrical net-

works.

Figure 13.1 illustrates a house in which the three following PLC technologies

coexist:

•

PLC community distribution to provide an access to the Internet;

•

LAN for the broadcasting of video streams from the InternetBox to PLC

devices close to the video terminals scattered in the house;

•

LAN for the broadcasting of the IP telephone signal and house automation

(remote controls, sensor information, and so forth) and domestic signals (baby

phones, video surveillance, and so forth) in the house.

Since these three technologies are high-throughput technologies, all of them

operate in the 2 to 30 MHz frequency band, but with distinct techniques for gaining

access to the medium and using the frequency band. Without any interoperability

standard, these PLC technologies were concurrently developed without regard for

their mutual coexistence.

The CEPCA (Consumer Electronics Powerline Communication Alliance) is cur-

rently working on the development of a guide on interoperability between PLC tech-

nologies that should allow optimized use of this frequency band.

CEPCA and Interoperability of PLC Technologies

Awaiting a PLC standard, the CEPCA has prepared a technical proposal in order to manage

the coexistence of PLC technologies. This proposal is based on a CDCF (commonly distrib-

uted coordination function) used for managing the time and frequency spaces in a distrib-

uted way between the various technologies.

This distribution is based on the following elements:

296 Hybrid PLC

Figure 13.1 Coexistence of PLC technologies over the same electrical network

1 2 ... 310 311 312 313 314 315 316 317 318 319 320 ... 348 349

Sem comentários

ZyXEL Communications PLA-470 V2 - V3.0.5 Guia de Instalação Página 315