ATOP’s APSB53253xxL20 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 supporting SONET OC-48 / SDH STM-16 and 20km transmission distance with SMF. They are RoHS compliant and lead-free.