docs: private static KNXMediumSettings getMedium(String id)
  	{
  		if (id.equals("tp0"))
  			return TPSettings.TP0;
  		else if (id.equals("tp1"))
  			return TPSettings.TP1;
  		else if (id.equals("p110"))
  			return new PLSettings(false);
  		else if (id.equals("p132"))
  			return new PLSettings(true);
  		else if (id.equals("rf"))
  			return new RFSettings(null);
  		else
  			throw new KNXIllegalArgumentException("unknown medium");
  	}