ZyXEL Communications PLA-470 V2 - V3.0.5 Installationsanleitung PDF herunterladen (Seite 274)

Placing Equipment

The location of the PLC devices on the electrical network clearly influences the PLC

signal propagation over the various electrical wirings running across a building.

Therefore, it is important to choose a location that best promotes the propagation

to the maximum network outlets, as illustrated in Figure 11.6.

The circuit breaker panel is a strategic place of the electrical network, since it

can be viewed as the network “hub,” where all the cables connect to recover the

electricity from the meter. Therefore, this “electrical” hub is the ideal place for the

placement of the PLC devices that will be used as the gateway, which will be con

nected both to the corporate Ethernet LAN and to the electrical network to broad

Choosing Network and Electrical Equipment 255

Table 11.4 Application Classes According to the User Priority Levels

USER PRIORITY

LEVEL

APPLICATION CLASS

Network check (characterized by packets for which the reception is guaranteed in

order to maintain the network infrastructure)

Voice (propagation delay of less than 10 ms and maximum known jitter–envisaged

situation: campus LAN crossing)

5 Video and audio (propagation delay of less than 100 ms)

Checked network traffic (typically for professional applications with admission

check and guaranteed bandwidth reservation during some transmission periods)

Platinium (typically for applications of the “best effort” type for some privileged

users of the PLC network)

1, 2

Background traffic (typically for file transfers and other important traffic with no

impact on the remainder of PLC network applications)

Best effort (typically the usual LAN traffic: electronic mail, Web navigation, FTP,

IRC, and so forth)

Figure 11.4 Capacitive coupling principle for a PLC device over the electrical network

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ZyXEL Communications PLA-470 V2 - V3.0.5 Installationsanleitung Seite 274