Electrical interference has the largest effect on the overall available bandwidth which is why the Powerline socket has a built in filtered socket to minimise the effect of locally generated noise. Ensuring that any other electrically noisy devices are plugged in at least 1 metre away such as power supply units, mobile charges, halogen lamps and dimmers switches will help. If in doubt, plug the noisy product into the Powerline socket directly so it can manage the noise with its built in filter.
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