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Finisar
Product Specification
1000BASE-T Copper GBIC Transceivers
FCL-8520/8521-3
Product Features
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Up to 1.25Gb/s bi-directional
data links
RoHS compliant and Lead Free
Extended operating temperature
range (0°C to +75°C)
Hot-pluggable
Fully metallic enclosure for low
EMI
Low power (1.5W typical)
Access to physical layer IC via 2-
wire serial bus
Applications
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1.25 Gigabit Ethernet over Cat 5
cable
Finisar’s FCL-8520/8521-3 1000BASE-T Copper GBIC transceivers are based on the
GBIC Specification Revision 5.5 1 . They are compatible with the Gigabit Ethernet and
1000BASE-T standards as specified in IEEE Std 802.3z 2 and IEEE Std 802.3ab 3 .
The FCL-8520-3 uses the GBIC’s RX_LOS pin for link indication, and 1000BASE-X
auto-negotiation must be disabled on the host system. The FCL-8521-3 is compatible
with 1000BASE-X auto-negotiation, but does not have a link indication feature
(RX_LOS is internally grounded). See AN-2032, “Commonly Asked Questions
Regarding Auto-negotiation on Finisar’s 1000BASE-T GBICs” 4 , for a more complete
explanation on the differences between the two models.
PRODUCT SELECTION
Part Number
FCL-8520-3
FCL-8521-3
? Finisar Corporation
Rev A, February 2006
Link Indicator on RX_LOS Pin
Yes
No
Compatible with 1000BASE-X
Auto-negotiation
No
Yes
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