Belden Inc. has redesigned its Layer 3 modular Gigabit switch to create a new version, the MSP30-X Modular Switch, which is suited for extreme environments. The switch not only maintains its modular ...

J1 is a momentary switch that initiates the test. S1 reverses the polarity of the signal to the diode under test (DUT), D3, to check the device in forward and reverse modes.