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Power Line Communication is still one of the most popular ways to solve the last-mile problem in Smart Metering. The main drawbacks of this medium are the harsh circumstances in the grid. The unpredictability of noise and impedance in the grid makes it a difficult task to model the physical channel and therefore choose the right modulation technique for the job. In this paper noise and impedance measurements are executed. This leads to a classification of the different types of loads in function of the basic parameters influencing power line communication.

In order to accomplish the ever increasing demand of the user, new DSL technologies ('digital subscriber line') are developing. A lot of research is going on to use also the common mode signal beside the differential mode signal. This promising technique requires new reliable models. For the modeling good approximations for the series impedance are indispensable. In this paper a formula who calculates this impedance is presented and also validated with measurements.

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