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Finisar
Product Specification
1000BASE-T Copper SFP Transceiver
FCLF-8520/8521-3
Product Features
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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
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Access to physical layer IC via 2-wire
Applications
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serial bus
10/100/1000 BASE-T operation in host
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1.25 Gigabit Ethernet over Cat
5 cable
systems with SGMII interface
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.
PRODUCT SELECTION
Part Number
FCLF-8520-3
FCLF-8521-3
Link Indicator on RX_LOS Pin
Yes
No
1000BASE-X auto-negotiation
enabled by default
No
Yes
? Finisar Corporation December 16, 2005 RevB
Page 1
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