ZyXEL Communications PLA-470 V2 - V3.0.5 Guia de Instalação descarregar pdf (Página 138)

Backbone of a Wi-Fi Network

As we’ll see in Chapter 13, dedicated to hybrid networks, each computer network

technology has advantages and disadvantages.

A radio computer network that provides both mobility and flexibility to the

users within the building where the network is installed can be built with Wi-Fi.

However, the hardware constraints of this technology make it necessary for it to be

based on a wired Ethernet backbone for full coverage of the building. This role of

Ethernet backbone can be attributed to a PLC local area network by connecting the

Wi-Fi access points to the electrical network.

Figure 6.8 illustrates the architecture of this network type in which each Wi-Fi

access point forming a radio cell is connected to the network by a PLC device.

InternetBox and PLC

Many Internet access providers in Europe, such as Orange, Free, Neuf-Cegetel,

Alice, Club-Internet, Vodafone, Belgacom; in the USA, such as Comcast; or in Asia

like NTT in Japan now offer solutions for accessing Internet “multiplay” services

through an InternetBox, particularly the following:

•

Data. The InternetBox is above all a modem to access the Internet with,

enabling users to access data services such as the Web, messaging, FTP, IRC,

P2P, and so forth.

InternetBox and PLC 119

Figure 6.7 Video surveillance on a PLC local area network

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ZyXEL Communications PLA-470 V2 - V3.0.5 Guia de Instalação Página 138