ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación descargar pdf (Pagina 151)

ments and at temperatures that can be as high as 70°C and are made of plastic for con

sumer equipment and of metal for professional equipment.

Inside the package, the entire hardware architecture is structured around the main

component (HomePlug PLC chip, see Figure 7.8, middle). The Intellon manufacturer is

the main supplier of HomePlug chips.

Table 7.3 summarizes the various versions of chips that appeared as the

HomePlug technology has progressed.

Around this PLC chip that implements all the functionalities of the PLC net-

works introduced in Chapter 3, a number of components and electronic circuits are

used to optimize the operation of the PLC modem:

•

Coupling to the electrical network (i.e., PLC modem connection to the electri-

cal network).

•

PLC signal gain control for optimized data emission/reception, including

under difficult conditions, due to noises on the electrical network in particular.

•

Storage of information on the PLC network state. This function is provided by

an EPROM (persistent memory when restarting the modem) and a SRAM

(volatile memory erased when restarting the modem), which keep information

on the state of the PLC links, network encryption keys, or access authoriza-

tion.

Figure 7.9 illustrates the hardware architecture of a HomePlug 1.0 PLC modem.

The manufacturers have developed two types of PLC modems: “desktop”

modems, which appear as packages to be placed on a table or on a pedestal, with a

cord to connect to outlets; and “wallmount” modems, which appear as integrated

packages directly connected into outlets. Most PLC modems are wallmount

modems since they are easy to use.

Figure 7.10 illustrates examples of wallmount (left) and desktop (right)

modems.

PLC USB Modems

PLC USB modems offer a USB interface so they can be connected to the USB ports of

computers or network terminals. The USB port acts as a virtual network interface

card for connection to the PLC network.

The interest of these modems resides in the fact that all computers do not have a

network interface card whereas they are all fitted with USB ports. However, they are

not as simple to configure as an Ethernet PLC modem.

132 Equipment

Table 7.3 Models of Intellon Chips

HomePlug CHIP

1.0 (also called 1.0.1) INT5130, INT51MX

Turbo (also called 1.1) INT5500

AV INT6000, INT6300

1 2 ... 146 147 148 149 150 151 152 153 154 155 156 ... 348 349

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ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación Pagina 151