Product Features
* Up to 1.25Gb/s bi-directional data links
* Hot-pluggable SFP footprint
* Extended case temperature
range (0°C to +85°C )
* Fully metallic enclosure for low EMI
* Low power dissipation (1.05 W typical)
* Compact RJ-45 connector assembly
* RoHS-compliant and Lead-Free
* 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
Finisar's FCLF-8520/8521-3 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 standards as specified in IEEE Std 802.3
2. The 1000BASE-T physical layer IC (PHY) can be accessed via I2C, allowing access to
all PHY settings and features.
The FCLF-8520-3 uses the SFP's RX_LOS pin for link indication, and 1000BASE-X
auto-negotiation should be disabled on the host system. The FCLF-8521-3 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
Regarding Finisar's 1000BASE-T SFPs", for a more complete explanation of the
differences between the two models and details on applications issues for the products.
Audited Supplier 
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