Aten Single-mode module 10km SFP Optical Module for KE89xx/KE99xx seriesAten 2A 137G 1. 25G Single Mode 10KM Fiber SFP Module provides 1 GbE connectivity up to 10 kilometers. The transceiver can be installed in both transmitters and receivers. As a hotpluggable module with a standard duplex connector for fiber communications, the 2A 137G works with single mode fiber (SMF) connections and operates at a nominal wavelength of 1310 nm which makes it a cost effective and high performance transceiver. Extend your network