Technical data

Hub Downstream Signal Quality Testing 5
DSOX4USBSQ USB 2.0 Signal Quality Analysis Application Electrical Testing Notes 69
Hub Downstream Hi-Speed Connection - Differential Probe
Perform these connection steps:
1 Attach the 5V power supply to J5 of the E2649- 66402 Host Hi- Speed
Signal Quality test fixture.
Set the Test switch to the TEST position.
Verify green POWER LED and yellow TEST LED are both lit.
2 Attach the Agilent 113xA differential probe to TP2 of the test fixture.
Ensure the + polarity on the probe lines up with D+ on the fixture,
located nearest to the USB connector.
3 Connect the upstream port of the hub to a high-speed root port of the
test bed computer.
4 Connect the [TEST PORT] of the test fixture into the down stream
facing port under the test of the hub. Apply power to the hub.
5 Please terminate the fixture's SMA connectors with 50 Ohm
terminators.
1
2
34
Hi-Speed Host
Hub
upstream
port
downstream
port under
test
P1
4“
Init. Port
Test
Port
5V
D+
D-
TP2
Host Hi-Speed
Signal Quality
Test Fixture
113xA
differential
probe