The industry standard cisco small form factor pluggable sfp transceiver modules are hot swappable inputoutput io devices that plug into 100base 1000base and 10gbase ports for sfp which connect the module port with the fiber optic or copper network the 1000base lxlh sfp transceiver module for smf compatible with the ieee 8023z 1000base lx standard operates on standard singlemode fiber optic link spans of up to 10 km and up to 550 m on any multimode fibers when used over legacy