ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación descargar pdf (Pagina 301)

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PLC gateway used for the connection to other IP networks.

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PLC injectors used in the public electrical network installations as illustrated

in Figure 12.11.

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PLC repeaters used for providing a continuous PLC signal over the entire cable

length up to the subscriber, which can reach 200 to 300m. The advantage of

the PLC network for local authorities is that the electrical network is much less

subject to disturbance than a home or corporate network.

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Gateway located in the electrical substation where the MV/LV or HV/MV

transformer is, which is used for injecting the PLC signal at the node of the star

topology of the public electrical network.

This architecture of the PLC technology distribution network is in the end rather

simple and generally without surprises, unlike that of a home or corporate network,

for which the drawings of the electrical network are often lacking, which requires

tests prior to installation.

In the case of the community network, the electrical utility has all the informa-

tion concerning the electrical network (type of cables, cable length, number of sub-

scribers on each branch of the electrical network, type of transformer, suitable

position of the repeaters, etc.).

Issues in Electrical Networks

Installing a telecommunications device on a public electrical network is accompa-

nied by a number of safety rules that must be complied with by all the parties inter-

vening on the electrical network devices, in particular the operators and the

electrical utility technical agents.

As far as the PLC networks are concerned, these rules are the following:

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Perfect isolation of the coupling and repetition devices;

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PLC device maintenance transparent to the operation of the electrical net

work;

282 PLC for Communities

Figure 12.11 Example of connection for Eichhoff PLC injector

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ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación Pagina 301