Cut Tape (CT) is the solid enclosure in which optical attenuator is packaged.The RF Attenuator is convenient to ship overseas because it is packed in a 0805 (2012 Metric).
E-TA2012 T 4DB N2 Features
E-TA2012 T 4DB N2 Applications
There are a lot of Nidec Copal Electronics E-TA2012 T 4DB N2 Attenuators applications.