Finisar FCLF8521P2BTL Benutzerhandbuch

© Finisar Corporation May 18, 2010 Rev B.2 

 

Page 1 

 

•  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 

 

 

 

•  1.25 Gigabit Ethernet over Cat 

5 cable 

Finisar’s 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 standards as specified in IEEE Std 
802.3

2

.  They are RoHS compliant and lead-free per Directive 2002/95/EC

3

 and Finisar Application 

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-
negotiation 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 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. The FCLF8522 shall support both RX_LOS pin for link 
indication and 1000BASE-X auto-negotiation. 
 

 

FCLF8520P2BTL Yes 

No 

FCLF8521P2BTL No 

Yes 

FCLF8522P2BTL Yes 

Yes