An active queue management process for network communications equipment. In accordance with the invention, an alternating current signal generator is connected to apply an alternating current signal to an accessible node of an IC device under test. Even if a pin axis X1 of the pin 28 and a central axis X4 of a clip 24 are deviated, the cap pin 26 is rotated and slid; and accordingly, the pin 28 may be inserted and fitted to the male side insertion portion 36. The first device rung can be the device that was most recently moved or the device that was most recently active. The UPS unit receives information transmitted by subscriber devices via the first power line, and transmits the received information to the network interface device via the second power line.