ATOP’s APSCxx253xDL40 Small Form Factor Pluggable (SFP) transceivers are compatible with the Small Form Factor Pluggable Multi-Sourcing Agreement (MSA), and it support 18 channel CWDM wavelength. The SFP transceivers are high-performance, cost-effective modules supporting dual data-rate of SONET OC-48/SDH STM-16 and 40km transmission distance with SMF. They are RoHS compliant and lead-free.