ZyXEL Communications PLA-470 V2 - V3.0.5 Instalační příručka stáhnout pdf (Strana 197)

In the case of all the stations’ different speeds, the waiting time is prolonged.

Because of this, the global network data rate falls heavily. If a station of the network

transmits at a speed of 1 Mbit/s, its transmission time is 14 times higher than that of

a station transmitting at 14 Mbit/s. Therefore, this station must wait 14 times longer

before transmitting its data. Its average useful throughput tends to be around

1 Mbit/s.

Figure 8.22 illustrates the likelihood of data collision over the electrical network

according to the number of connected live PLC devices.

Security

Unlike Wi-Fi networks, PLC networks provide top class security insofar as the

medium cannot be accessed (electrical wirings buried in the walls or in packages)

and is also not dangerous.

Therefore, security is achieved from the moment the user implements a satisfac-

tory password configuration on its PLC network. We detail this configuration in the

following chapters dedicated to the implementation of a PLC local area network.

178 Installation

Figure 8.21 Theoretical data rate and useful throughput variation with the HomePlug 1.0

technology

Figure 8.22 Likelihood of collisions according to the number of PLC modems on the electrical

network

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ZyXEL Communications PLA-470 V2 - V3.0.5 Instalační příručka Strana 197