ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación descargar pdf (Pagina 277)

In the case of a company, it is however necessary to see to it that the firewalls for

access to the Internet are correctly configured and that the various logical corporate

networks are correctly separated in order to protect its data. The following sections

introduce the main lines to be complied with for this purpose.

Security Topologies

There are radical methods to make a PLC corporate network secure, like the instal-

lation of the network fully outside of the corporate network or the access protection

between the PLC part and the remainder of the network.

Figure 11.7 illustrates the first solution. It is generally expensive to install a PLC

network outside of the corporate network in terms of time or equipment purchase.

In addition, the company finds itself with two networks to manage and therefore

two Internet connections, two DHCP servers, and so forth, the administration of

which obviously requires more time.

In the second solution, illustrated in Figure 11.8, the connection between the

PLC network and the corporate network is made secure in the same manner as an

Internet connection by means of a firewall.

The AsokaUSA company proposes a PLC switch used for managing several

HomePlug 1.0 and Turbo PLC networks. Since all the HomePlug 1.0 and Turbo

devices support only one network key at a time, they cannot belong to several PLC

networks at the same time.

Moreover, several HomePlug 1.0 and Turbo PLC devices cannot be separated in

the same electrical network if they have the same network key. The only method to

separate them is to enter a different network key on each of them and a PLC device

258 PLC for Businesses

Figure 11.7 Architecture example for a PLC network not connected to the corporate network

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ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación Pagina 277