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FCLF-8520/8521-3 1000BASE-T SFP Product Specification Finisar
IV. High-Speed Electrical Interface
All high-speed signals are AC-coupled internally.
High-Speed Electrical
Interface,
Transmission Line-SFP
Parameter Symbol Min Typ Max Units Notes/Conditions
Line Frequency f
L
125 MHz 5-level encoding, per
IEEE 802.3
Tx Output Impedance Z
out,TX
100 Ohm Differential, for all
frequencies between
1MHz and 125MHz
Rx Input Impedance Z
in,RX
100 Ohm Differential, for all
frequencies between
1MHz and 125MHz
Table 4. High-speed electrical interface, transmission line-SFP
High-Speed Electrical Interface,
Host-SFP
Parameter Symbol Min Typ Max Units Notes/Conditions
Single ended data input
swing
V
insing
250 1200 mV Single ended
Single ended data output
swing
V
outsing
350 800 mV Single ended
Rise/Fall Time T
r
,T
f
175 psec 20%-80%
Tx Input Impedance Z
in
50 Ohm Single ended
Rx Output Impedance Z
out
50 Ohm Single ended
Table 5. High-speed electrical interface, host-SFP
© Finisar Corporation December 16, 2005 RevB Page 4