FCLF8520P2BTL, FCLF8521P2BTL and FCLF8522P2BTL 1000BASE-T Copper Small Form Pluggable (SFP) transceivers are
based on the SFP Multi Source Agreement (MSA)1. They are compatible with the Gigabit Ethernet and 1000BASE-T stan-
dards as specified in IEEE Std 802.32. The transceiver is RoHS compliant and per Directive 2011/65/EU3 and Finisar Appli-
cation Note AN-2038. The 1000BASE-T physical layer IC (PHY) can be accessed via I2C, allowing access to all PHY settings
and features.The FCLF8520P2BTL uses the SFP’s RX_LOS pin for link indication, and 1000BASE-X auto_x005F_xFFFE_ne-
gotiation should be disabled on the host system. The FCLF8521P2BTL is compatible with 1000BASE-X auto-negotiation, but
does not have a link indication feature (RX_LOS is internally grounded). See AN-2036, “Frequently Asked Questions Regard-
ing Finisar’s 1000BASE-T SFPs”, for a more complete explanation on the differences between the two models and details
on applications issues for the products. The FCLF8522 shall support both RX_LOS pin for link indication and Up to 1.25Gb/s bi-directional data links
• Hot-pluggable SFP footprint
• Extended case temperature range (-40°C to +85°C )
• Fully metallic enclosure for low EMI
• RoHS compliant and Lead Free
• Low power dissipation (1.05 W typical)
• Compact RJ-45 connector assembly
• Access to physical layer IC via 2-wire serial bus
• 10/100/1000 BASE-T operation in host systems with SGMII interface
APPLICATIONS:• 1.25 Gigabit Ethernet over Cat 5 cable
