ZyXEL Communications PLA-470 V2 - V3.0.5 Guia de Instalação descarregar pdf (Página 199)

configuring them according to the targeted operating systems. They are described

for Windows XP as well as for the Linux and FreeBSD systems.

Configuring a PLC Network Under Windows

Almost all the tools used for configuring HomePlug PLC devices have the same

functionalities for the configuration of HomePlug chip parameters. As we have seen

in Chapter 7, HomePlug chips mainly originate from the Intellon manufacturer.

They are used for reading a number of values stored on the quality of exchanges

between PLC devices. The PLC network is configured and optimized using these val-

ues.

Among the HomePlug parameters that can be configured, let’s mention the fol-

lowing ones in particular:

•

The NEK (network encryption key) used for securing data exchanges in the

same PLC local area network;

•

The DEK (default encryption key) used for configuring the NEK on all the

remote PLC devices scattered over the electrical network;

•

The PLC device transmission priority among four possible ones (CA0, CA1,

CA2, CA3) used for configuring some PLC devices like gateways to other net-

works, in particular Ethernet.

Table 9.1 summarizes the main parameters which can be read and presented to

the PLC network user with HomePlug configuration tools.

Estimating the PHY Data Rate of Communications Between PLC Devices

The various PLC devices store the instantaneous value of the “bytes in 40 symbols” parame-

ters exchanged by the devices in the HomePlug chip. This value is used for estimating

the PHY data rate (at the physical layer level) between PLC devices, as we have seen in

Chapter 3.

The maximum PHY data rate corresponds to the number of data (or bits) ensuring the

best possible modulation coded with 40-symbol OFDM blocks of duration 8.4 μs.

This gives, for HomePlug 1.0 and Turbo:

HomePlug 1.0:

Datarate

PHMAXY

519 8

40 8 4

12 35714286

,/Mbit s

HomePlug Turbo:

Datarate

PHMAX

2 812 8

40 8 4

66 95238095

,/Mbit s

Still using the data mentioned in Chapter 3, the PHY data rate can be calculated

according to the values given by the HomePlug chip:

HomePlug 1.0:

Datarate

BYTES

PHY

in symbols

−

×+−

−588 38

481 42

588 38

481

519

⎛

⎝

⎜

⎞

⎠

⎟

Mbit s/

180 Configuration

1 2 ... 194 195 196 197 198 199 200 201 202 203 204 ... 348 349

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