Teledyne LeCroy QPHY-USB - Manual (Page 46)

46
QPHY-USB Operator’s Manual Rev F
FULL AND LOW-SPEED TESTS
All HS-capable devices, hosts, and hubs must support Full-Speed (12 Mb/s) data rates. Compliance testing
requires this rate be tested along with the High-Speed (480 Mb/s) rate. Full-Speed compliance requires both
interoperability and electrical tests. The LeCroy USB 2.0 test solution addresses the electrical test requirements
for Full-Speed operation. These tests include signal quality, inrush current, and droop/drop. The package also
supports Low-Speed electrical tests, which apply only to hub/host downstream ports and Low-Speed devices. The
following topics provide detailed descriptions of the Full and Low-Speed electrical tests for hosts, hubs and
devices.
Equipment requirements
Standard USB products
Please refer to the USB-IF Full and Low-Speed Electrical and Interoperability Compliance Test Procedure available at
UU
www.usb.org
UU
for a current list of standard USB products recommended for use in FS/LS electrical testing and
interoperability testing. Due to limited product lifetimes the approved products for testing change periodically so it is
important to obtain the latest equipment lists periodically.
The following list of standard equipment is required for performing Full and Low -Speed electrical tests:
Item Quantity
1 100 mA load board (for bus powered hubs only) 1*
2 500 mA load board 1*
3 Droop test board 1
4 SQiDD board 1
5 Full-Speed hub (self powered) 1
6 High-Speed hub (self powered) 4
7 5 m USB cables 6
* Additional load boards may be required depending on the number of downstream ports on the product. The test fixture provides enough
loads to test 12 port hubs/hosts.