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FCLF8520P2BTL, FCLF8521P2BTL and FCLF8522P2BTL 1000BASE-T SFP Product SpecificationFinisar

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

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

insing

250 1200 mV Single ended

Single ended data output

swing

outsing

275 800 mV Single ended, can be modified by writing

to the PHY’s internal registers. For more

details, see Marvell datasheet

Rise/Fall Time T

175 psec 20%-80%

Tx Input Impedance Z

50 Ohm Single ended

Rx Output Impedance Z

50 Ohm Single ended

Table 5: High-Speed electrical interface, host-SFP

1 2 3 4 5 6 7

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