This part of IEC 62343 provides a performance specification template for wavelength selective switches. The object is to provide a framework for the preparation of detail specifications on the performance of wavelength selective switches. Additional specification parameters may be included for detailed product specifications or performance specifications. However@ specification parameters specified in this standard shall not be removed from the detail product specifications or performance specifications. The technical information regarding wavelength selective switches@ and their applications in DWDM systems will be described in IEC TR 62343-6-4@ currently under consideration.