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Figure 8.8 illustrates the HomePlug AV PSD curve in the 1- to 30-MHz band.

We clearly observe that some frequencies are less emissive than other ones (–80 dB

in comparison with −50 Hz). We can consider that a frequency, the PSD of which is

around −80 dB, is not perceptible for the electrical network and the devices close to

electrical wiring.

Table 8.5 summarizes the various HomePlug AV sub-bands, from 1.71 to 28

MHz, with their maximum PSD (expressed in dBm/Hz) and whether the sub-band is

active or not (if another technology already uses this sub-band), with the numbers of

sub-bands 0 to 1,535. The last column gives the radio technologies in this sub-band.

Topology of Electrical Networks

There are two wiring types for the electrical networks of any building, whether

domestic, professional, or industrial:

•

Single-phase, consisting of two cables (neutral and phase). The electrical

potential difference between these two cables is 110V or 220V flowing from

the circuit breaker panel to the outlets and lights of the building.

•

Three-phase, consisting of four cables (neutral and three phases). The electri-

cal potential difference between the neutral cable and a phase cable is 110V or

160 Installation

Table 8.4 Transmission Power in Each Sub-Band

PHYSICAL FRAME COMPONENT AVERAGE TRANSMISSION POWER

HomePlug 1.0.1

HomePlug AV

Preamble 3 dB 3 dB

FC (Frame Control) 0 dB 3 dB

PPDU data 0 dB 2.2 dB

PRS (Priority Resolution Symbol) 3 dB 3 dB

Figure 8.8 Limit PSD mask for HomePlug AV in the 1- to 30-MHz frequency band

1 2 ... 174 175 176 177 178 179 180 181 182 183 184 ... 348 349

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ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación Pagina 179