1000BASE-T/100BASE-TX/10BASE-T Physical Layer Compliance Tests Manual
Intel Confidential 23
1000BASE-T MDI Return Loss
6 1000BASE-T MDI Return Loss
IEEE Standard 40.8.3.1
6.1 Test Purpose
To measure the return loss on all four channels at the MDI.
6.2 Specification
The return loss for each transmit/receive channel shall be:
≥ 16 dB from 1 MHz to 40 MHz, and
≥ 10 – 20LOG(f/80)dB from 40 MHz to 100 MHz, where f is in MHz.
6.3 Test Equipment
•
Vector network analyzer
•
BNC cable with 50-ohm characteristic impedance
•
UUT with gigconf.exe test software.
6.4 Test Fixtures
•
Fixture 40.8.3.1.A, Balun test fixture (Appendix A)
•
Fixture 40.8.3.1.B, calibration standards (Appendix A)
•
Fixture 40.8.3.1.C, square pin fixture (Appendix A)
6.5 Test Procedure
1. Connect the equipment as shown in the figure below. Note: do not connect test fixture
40.8.3.1.C to the UUT's RJ-45 at this time. See Appendix A for more details.
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