FCMJ-8520/8521-3 1000BASE-T SFP Product Specification
F i n i s a r
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
MHz 5-level encoding, per
IEEE 802.3
Line Frequency
fL
125
Tx Output Impedance
Rx Input Impedance
Zout,TX
100
100
Ohm Differential, for all
frequencies between
1MHz and 125MHz
Zin,RX
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
Vinsing
250
1200
mV
Single ended
Single ended data output
swing
Rise/Fall Time
Tx Input Impedance
Rx Output Impedance
Voutsing
350
800
mV
Single ended
Tr,Tf
Zin
Zout
175
50
50
psec
Ohm
Ohm
20%-80%
Single ended
Single ended
Table 5. High-speed electrical interface, host-SFP
Finisar Corporation March 16, 2005 Rev H
Page 4
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