Suitable for trunk amplification and extending amplification in single-way CATV system; Using plug-in module (made by PHILIPS or MOTOROLA) design to make upgrade easy; Single or double outputs for selection(D2), one chief output and two tap outputs(D3); Manual gain control and slope control; Provide two power supply method, centralized(AC30～60V) or individual(AC220V); Waterproof and dustproof design, fast heat dissipation and fine screening characteristic; Efficient R-transformer power supply; Individual input port AC60V power supply; Two degrees slope control or plug-in temperature compensator for selection