ATOP’s APSB43123xxL20 Small Form Factor Pluggable (SFP) transceivers are compatible with the Small Form Factor Pluggable Multi-Sourcing Agreement (MSA), The SFP transceivers are high-performance, cost-effective modules and supporting multi-rate for Gigabit Ethernet and 20km transmission distance with SMF. They are RoHS compliant and lead-free.