ZyXEL Communications PLA-470 V2 - V3.0.5 Instalační příručka stáhnout pdf (Strana 166)

ticular, these electrical devices send back electromagnetic noises in the frequency

band of the PLC devices. Therefore, it is interesting to install filters as close to the

disturbing devices as possible in order to stop frequencies generating disturbances.

A PLC filter can also be used to stop the outgoing PLC signal so that it does not

propagate outside of the electrical network demarcated by the meter.

Figure 7.30 illustrates an electrical network including PLC devices, disturbing

devices (light regulator, hairdryer, power strip, circuit breaker), and the location of

the PLC filters.

A filter is connected between the disturbing device and the electrical network. It

acts as an over-outlet above the outlet with the disturbing electrical device connect-

ing to the filter.

Table 7.5 summarizes the main electrical devices that may disturb a local area

network.

Figure 7.31 illustrates an Eichhoff PLC blocking filter. This device is placed

between the electrical switchboard and the domestic, professional or industrial elec-

trical network to prevent the PLC signal from going over the meter and is recovered

from another electrical network.

CMM (Courant Multimédia) sells over-outlet antinoise filters that are placed

between the potentially disturbing devices of the PLC network and the outlet to

which the power supply of the device in question is connected. This device is illus-

trated in Figure 7.32.

The French PLC company LEA has developed a PLC all-in-one filter and

modem to be used on the electrical outlet, filtering the signal coming from the elec-

trical devices connected on this electrical outlet. This device leaves the electrical

cable clean from the perturbations coming from the devices connected on a

multi-outlet plugged on the Lea NetSocket200+. This device is quite unique in the

PLC industry as a whole all-in-one device for filtering, saving an electrical outlet

and connecting multiple electrical devices. Figure 7.33 illustrates the Lea

NetSocket200+.

Filters 147

Figure 7.29 Home-made PLC repeater

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ZyXEL Communications PLA-470 V2 - V3.0.5 Instalační příručka Strana 166