ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación descargar pdf (Pagina 44)

main circuit breaker panel, and the PLC signal circulates in all branches by passing

through the panel.

Figure 2.7 illustrates a simplified example of an electrical network with three

branches from the circuit breaker panel. On the right side of the illustration, the

PLC signal propagates between all the outlets, thereby connecting the PLC devices.

This example shows how a private electrical network can be viewed as a shared

medium equivalent to a data bus.

Analogy with a Network Hub

The two preceding examples of public and private electrical networks demonstrate

that any type of electrical network can be viewed as an immense data bus with the

network’s PLC devices connected to it.

In terms of telecommunications equipment, the most appropriate analogy is a

concentrator or hub, with the various PLC devices connected to the electrical net-

work representing different Ethernet ports.

Figure 2.8 illustrates this analogy schematically.

The Concept of PLC Repeaters

As we will see in Chapter 7, dedicated to PLC equipment, it can become necessary to

repeat the signal in order to extend its coverage zone and to connect additional

equipment.

Architecture with a Shared Medium 25

Figure 2.6 The public electrical network viewed as a shared medium

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 348 349

Sin comentarios

ZyXEL Communications PLA-470 V2 - V3.0.5 Guía de instalación Pagina 44