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FCLF8520P2BTL, FCLF8521P2BTL and FCLF8522P2BTL 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
Line Frequency
Symbol
f L
Min
Typ
125
Max
Units
MHz
Notes/Conditions
5-level encoding, per IEEE
802.3
Tx Output Impedance
Rx Input Impedance
Z out,TX
Z in,RX
100 Ohm Differential, for all
frequencies between 1MHz
and 125MHz
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
275
800
mV
Single ended, can be modified by writing
swing
to the PHY’s internal registers. For more
details, see Marvell datasheet 5
Rise/Fall Time T r ,T f
Tx Input Impedance Z in
Rx Output Impedance Z out
175
50
50
psec
Ohm
Ohm
20%-80%
Single ended
Single ended
Table 5: High-Speed electrical interface, host-SFP
? Finisar Corporation May 18, 2010 Rev B.2
Page 4
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