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82575 Ethernet Controller Design Guide
8
consistent from sample to sample and that measurements meet the published
specifications.
3. Perform physical layer conformance testing and EMC (FCC and EN) testing in real
systems. Vary temperature and voltage while performing system level tests.
3.1.2.2 Modules for 1000 BASE-T Ethernet
Magnetics modules for 1000 BASE-T Ethernet are similar to those designed solely for
10/100 Mbps, except that there are four differential signal pairs instead of two. Use the
following guidelines to verify specific electrical parameters:
1. Verify that the rated return loss is 19 dB or greater from 2 MHz through 40 MHz for
100/1000 BASE-TX.
2. Verify that the rated return loss is 12 dB or greater at 80 MHz for 100 BASE-TX (the
specification requires greater than or equal to 10 dB).
3. Verify that the rated return loss is 10 dB or greater at 100 MHz for 1000 BASE-TX
(the specification requires greater than or equal to 8 dB).
4. Verify that the insertion loss is less than 1.0 dB at 100 kHz through 80 MHz for 100
BASE-TX.
5. Verify that the insertion loss is less than 1.4 dB at 100 kHz through 100 MHz for
1000 BASE-T.
6. Verify at least 30 dB of crosstalk isolation between adjacent channels (through 150
MHz).
7. Verify high voltage isolation to 15000 Vrms. (Does not apply to discrete
magnetics.)
8. Transmitter OCL should be greater than or equal to 350 μH with 8 mA DC bias.
3.1.2.3 Third-Party Magnetics Manufacturers
The following magnetics modules have been used successfully in previous designs..
3.1.2.4 Layout Guidelines for Use with Integrated and Discrete Magnetics
Layout requirements are slightly different when using discrete magnetics.
These include:
• Ground cut for HV installation (not required for integrated magnetics)
• A maximum of two (2) vias
•Turns less than 45
°
• Discrete terminators
3.2 Designing with the 82575/EB/ES Gigabit Ethernet
Controller
This section provides design guidelines specific to the 82575/EB/ES controller.
Manufacturer Part Number
Pulse H5007
Bel (discrete) Bel 0344FLA