Products: adjustable attenuator is available without interruption circuit within a certain frequency range in the form of adjusting the power level stepping microwave circuit, the machine can also be used as an attenuator equipment, with a small size, high accuracy , stable and reliable. Features: small size, high accuracy, on-line structure, environmental adaptability, anti-stress, good stability, suitable for all fibers. Application: telecommunications network, LAN, CATV systems, digital multimedia transmission system