ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación descargar pdf (Pagina 155)

•

data circulation over the cable television network to make it the backbone of

the PLC network;

•

use of the coaxial interface with an adapter called “injector” (see later in this

chapter) used to emit the PLC signal directly over the electrical wiring without

using outlets.

Although these PLC modems use a medium that is not the electrical wiring, they

are compatible with HomePlug via HomeNetworking technologies such as

HomePNA (Home Phoneline Network Alliance) or UPA (Universal Powerline Asso-

ciation).

Table 7.4 gives the bit rates of the main PLC cable TV modems according to the

technology used.

The HomePNA standard also enables the use domestic telephone cables to con-

vey data. The Corinex company markets the CableLAN Combo Adapter product in

particular, which uses the HomePNA 3.0 standard and has two interfaces: a coaxial

interface (F-type connector) and a telephone interface (RJ-11 connector).

PLC Modems Integrated with Electrical Outlets

Some manufacturers offer PLC modems directly integrated with electrical outlets.

The Lea and Legrand companies have developed a PLC outlet, called

“SmartPlug,” which integrates a HomePlug PLC modem into the outlet unit

and Ethernet RJ-45 connectors. The SmartPlug schematic diagram is illustrated in

Figure 7.16.

PLC/Wi-Fi Modems

As we’ll see in Chapter 13, dedicated to hybrid networks, the PLC and Wi-Fi tech-

nologies fully complement each other and enable users to build a complete network

with optimum radio coverage. The PLC network acts as the backbone of the Wi-Fi

network in order to provide a better radio coverage to this network.

The latest evolutions of the HomePlug technology make it possible to compare

the performance of the two technologies. HomePlug Turbo provides a maximum

useful throughput at the physical level of 85 Mbit/s, and the IEEE 802.11g standard

of 55 Mbit/s. The PLC/Wi-Fi devices make it possible to benefit both from easy PLC

use and Wi-Fi mobility.

Some of these devices integrate PLC and Wi-Fi components whereas other

devices provide PCMCIA slots in a PLC modem enabling the user to use the best

Wi-Fi board for his or her radio network.

136 Equipment

Table 7.4 Bit Rates of the Main PLC Cable TV Modems

PLC CABLE TV MODEM TECHNOLOGY BIT RATE (Mbit/s)

Corinex CableLAN HomePNA 1.0 10

Corinex CableLAN AV HomePNA 3.0 128

Corinex CableLAN 200 Pre-UPA 200

1 2 ... 150 151 152 153 154 155 156 157 158 159 160 ... 348 349

Sin comentarios

ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación Pagina 155