ATOP’s AP-ST1 Copper Small Form Pluggable (SFP) transceivers are based on the SFP Multi Source Agreement (MSA), They are compatible with the Gigabit Ethernet and 1000BASE-T standards as specified in IEEE Std 802.32. The 1000BASE-T physical layer IC (PHY) can be accessed via I2C, allowing access to all PHY settings and features. They are RoHS compliant and lead-free.