The Anritsu MN9662A/MN9664A/MN9672A/MN9674A are channel selectors for outputting the optical signal input to the common channels to any output channel. GPIB and RS-232C interfaces are provided as standard equipment, and the selector can also be controlled by the MT9810B Optical Test Set. These functions are available to construct an automatic measurement system. The selector is ideal for R&D and quality evaluation of transmission equipment and devices using EDFAs, such as trunk optical transmission systems, optical CATV analog transmission systems, WDM transmission systems, etc.Various models are available with one or two common channels and eight or sixteen output channels