SFP-5040-WA - Fast Ethernet OC3 or STM-1 BiDirectional single strand WDM SFP transceiver, Tx:1310nm/Rx:1550nm, type A, max range 40Km, single LC connector
Amazon.com: Digitus Mini GBIC SFP Transceiver Module for Gigabit Switch/Multimode/Laser Product / 1 x LC Duplex Connector / 850nm Wavelength/for a Distance of up to 0.55 Km : Electronics