Teledyne LeCroy QPHY-USB - Manual (Page 37)

QPHY-USB Software Option
QPHY-USB Operator’s Manual Rev F
37
HUB HIGH-SPEED UPSTREAM REPEATER
Figure 36. Hub and Device Fixture Connections for Upstream Repeater Test
1. Select Hub in the Mode control and HS Upstream Repeater in the Test control of the USB Test Wizard.
Note: Longer cables and/or adapters may be used to ease connection of Mini-B and Micro-B connectors.
2. Follow the instructions in the USB Test Wizard to acquire the waveforms as shown:
Figure 37. Initial signal acquisition for hub upstream repeater test
The second packet is the device signal. It passes upstream to the hub (C4) and the hub repeats it to the host
(C1).