Finisar FCLF-8521-3 User Manual

 

•  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 

 

 

 

 

•  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 on the 
differences between the two models and details on applications issues for the products. 
 

 

 

FCLF-8520-3 Yes 

No 

FCLF-8521-3 No 

Yes 

© Finisar Corporation December 16, 2005 RevB 

 

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