ZyXEL Communications PLA-470 V2 - V3.0.5 Instalační příručka stáhnout pdf (Strana 299)

Constraints of the Electrical Network for PLC Architecture

If the electrical network of a country supposedly not interconnected to its neighbors

is examined, the main constraints influencing the architecture of a PLC network in a

low voltage electrical network are the following:

•

Geographical area. The network has different characteristics in a residential

environment, in a corporate environment (generally with a higher meter den-

sity), or in an industrial environment (generally more demanding in terms of

quality of service).

•

Number of meters per low voltage network. High density difference between

rural areas and dense office buildings areas.

•

Cable lengths. Usually, the cable length to reach the subscribers varies from

50m (dense urban environment) to 300m (low density rural environment).

•

Network topology. An electrical network consists of electrical wirings con-

necting the network transformers to the delivery points, the number of which

varies according to the area under consideration.

However, it is important to be aware of the differences concerning the topology

of the existing electrical networks in various countries, which implies new PLC con-

straints and can delete other constraints.

For example, in the USA, the housing outside big cities is very scattered and only

a few meters are connected to a MV/LV transformer, whereas in France there are

about 200 meters on average. In the case of the USA, it is understandable that the

“transformer remoteness and number of customers sharing the resource” parameter

is not as important as in Europe.

PLC Architecture

Using PLC technologies as a distribution network for a community in order to pro

vide an Internet access requires a PLC network architecture different from the archi

280 PLC for Communities

POP = Point of Presence

(very high throughput IP point

of presence)

Figure 12.9 Telecommunications networks pyramid

1 2 ... 294 295 296 297 298 299 300 301 302 303 304 ... 348 349

Žádné komentáře

ZyXEL Communications PLA-470 V2 - V3.0.5 Instalační příručka Strana 299