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
Line Frequency
Tx Output Impedance
Notes/Conditions
5-level encoding, per
IEEE 802.3
Z
out,TX
100
Ohm Differential, for all
frequencies between
1MHz and 125MHz
Z
in,RX
100
Ohm Differential, for all
frequencies between
1MHz and 125MHz
Table 4. High-speed electrical interface, transmission line-SFP
Symbol
f
L
Min
Typ
125
Max
Units
MHz
Rx Input Impedance
High-Speed Electrical Interface,
Host-SFP
Parameter
Single ended data input
swing
Single ended data output
swing
Rise/Fall Time
Tx Input Impedance
Rx Output Impedance
Symbol
V
insing
V
outsing
T
r
,T
f
Z
in
Z
out
Min
250
350
175
50
50
Typ
Max
1200
800
Units
mV
mV
psec
Ohm
Ohm
Notes/Conditions
Single ended
Single ended
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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