The MLO4034 is a stand-alone optical switch box that can support the testing of optical transceivers. Instead of having separate components such as optical switches, wavelength demultiplexers, hand-held power meters and VOAs, the MLO unit has all of them integrated in a single box. It is also part of the ML7007 Series of automated transceiver test solutions. The latter targets the fully automated testing of 10G to 400G optical transceivers. The MLO4034 Optical Switch Box plays a pivotal role in the ML7007 Series by enabling automatic switching between the fiber connections without user intervention as it includes optical switches, variable attenuators, power monitors and a WDM demultiplexer.