As we have notified you regularly VCCI Council will start dealing with the filing of conformity verification reports on telecommunication ports conducted EMI from April 2010. This notice is about Impedance Stabilization Network (ISN) to be used for the measurement of EMI in this case. There are two types of circuits of which an ISN is made (see Figures 5-7 and 8-11 in the attachment). Please be advised that ISN of Figure 8-11 type shall not be used in the situation described in the warning note to each figure in order to avoid obtainment of wrong results. If you are not sure about the type of ISN you are going to use, please ask the supplier of the ISN. The restriction on the use of ISN warned in this notice is going to be reflected in the VCCI Technical Requirements (V-3/2009.04) at the next revise time which can be viewed in the Technical Requirements(V-3/2010.04) in the VCCI Website after April 1, 2010.