ZyXEL Communications PLA-470 V2 - V3.0.5 Instalační příručka Strana 172

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As explained before, the PLC networks are not radio networks, but their imple-
mentation over electrical wiring produces radiated waves that propagate with the
wiring acting as radio aerials. Therefore, PLC networks are viewed by the telecom-
munications regulatory bodies as radio networks that, as such, must comply with
transmission power and frequency band constraints.
As indicated before, the frequencies used by high rate PLC are within the 1- to
30-MHz band. This band is also used by amateur radio and future digital
short-wave radio called DRM (Digital Radio Mondial), which will be used to
Frequency Bands 153
Figure 8.1 Ethernet frame for the configuration of a HomePlug network
Figure 8.2 PLC frequency bands
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