FCLF-8520/8521-3 1000BASE-T SFP Product Specification
IV. High-Speed Electrical Interface
All high-speed signals are AC-coupled internally.
High-Speed Electrical
Interface,
Transmission Line-SFP
F i n i s a r
Parameter
Line Frequency
Symbol
f L
Min
Typ
125
Max
Units
MHz
Notes/Conditions
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
Single ended data input
Symbol
V insing
Min
250
Typ
Max
1200
Units
mV
Notes/Conditions
Single ended
swing
Single ended data output
V outsing
350
800
mV
Single ended
swing
Rise/Fall Time
Tx Input Impedance
Rx Output Impedance
T r ,T f
Z in
Z out
175
50
50
psec
Ohm
Ohm
20%-80%
Single ended
Single ended
Table 5. High-speed electrical interface, host-SFP
? Finisar Corporation December 16, 2005 RevB
Page 4
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