ZyXEL Communications PLA-470 V2 - V3.0.5 Instalační příručka stáhnout pdf (Strana 236)

CHAPTER 10

PLC in the Home

In spite of the still relatively high cost of PLC devices, more and more people are

tempted to install a power line communication home network. The fact that no

cables have to be laid seems to be the decisive factor for such a choice.

The installation of a PLC network in a house or apartment is actually extremely

simple. All you have to do is connect the PLC devices to the electrical network and

configure them. Ideally, you should have an Internet connection via an ADSL

modem (cable, satellite, or even 56K) that you just have to connect to a PLC device

acting as a gateway to provide Internet access to all the electrical network outlets.

New Internet access offers are made available by providers via two boxes: an

ADSL modem, which connects to the voice jack, and a video decoder box, which

receives the Internet IP video stream and broadcasts it to a TV set or an HDTV

screen. Some Internet access providers (IAP) add two PLC devices to these boxes in

order to connect them. This tendency will intensify with the development of HD

(high definition) video over IP services for domestic customers, which will be used

for broadcasting video streams to the various TV screens in the house. PLCs are one

of the best solutions for broadcasting these IP streams in terms of throughput or sig-

nal coverage area.

The topology of a PLC home network may vary depending on requirements and

electrical network architectures as well as the chosen devices and the network oper-

ating mode used.

Figure 10.1 illustrates a PLC home network in which the PLC device is con-

nected to the Internet by means of a modem enabling connection sharing.

This chapter is devoted to the optimum installation of a PLC home network,

from the choice of a device to its installation and its configuration. The installation

of a home network is not a very difficult job, but it requires compliance with some

rules, notably concerning the electrical network and safety measures.

Electrical Security

PLC technology uses the 110-220V/50 to 60 Hz LV electrical network as a commu-

nication medium. Since this network is hazardous for human safety, it is important

to comply with a few elementary safety measures in order to avoid electrocution

risks.

Figure 10.2 illustrates a typical sign symbolizing electrical hazards.

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ZyXEL Communications PLA-470 V2 - V3.0.5 Instalační příručka Strana 236