ET4201 series of Small Form Factor Pluggable (SFP) transceiver module is specifically designed for the high performance integrated duplex data link over single or multi-mode optical fiber. These transceiver modules are compliant with the SFP Multi-source Agreement (MSA). With the ability to hot swap, these modules offer an easy way to be installed into SFP MSA compliant ports at any time without the interruption of the host equipments operating online.