FiberPlex Technologies fiber optic SFP module for use in the WDM16 and TD-6010 units. The SFP-SHDVX-3131-B is a Hi Definition rated (3K) Singlemode transceiver ( send & receive in the same unit) utilizing LC type fiber connection measuring 1310 nm (nanometers) with a Duplex fiber strand channel with a distance range of 20 km (approximately 12 miles).