The L-com FOL-AT-LCUSM-03D is an attenuated fiber loopback module used for testing and provisioning fiber optic data links. The L-com FOL-AT-LCUSM-03D features LC connectors and single mode fiber with an attenuation level of 3dB, which allows for directly connecting transmitter and receiver ports (looping back) without the need for a separate fiber cable and inline attenuators. The L-com FOL-AT-LCUSM-03D attenuated fiber loopback module is one of thousands of quality fiber optic components and solutions available in-stock and ready to ship from L-com.