Made to order from 1 to 40 dB, for 600-ohm line impedance.
Connects in-series with a modular line cord, on the middle pins of the jack.
Optimized for both voltage-driven (like from an op amp) and impedance-driven (like from a transmission line), to provide the most accurate attenuation in either case.
The low impedance error ensures accuracy when two or more square pad attenuators are hooked in series to make another value. (Like 10 dB + 3 dB to make 13 dB.)
Also available in 66 Block and Modular RJ45 versions.