Emulex OneCommand Manager Application User Manual (P006979-01A Version 5.2, August 2011)

The OneCommand Manager User Manual Page 179
All functions are supported locally and remotely on hosts managed with TCP/IP access. Test results and
the status of running tests are time stamped and appear in the Test Status area.
Figure 111: NIC Diagnostics tab
OneConnect Loopback Test Combinations
Run the following loopback test combinations using the appropriate checkboxes:
• DMA Loopback Test - The DMA loopback test sends data from the host to the adapter, then
back to the host, where it is checked for data miscompute errors. All tests except the DMA
loopback test are run on the currently selected port. The DMA loopback test is run across the
entire adapter. The same diagnostic is therefore executed regardless of the currently selected
physical port. Also, unlike other diagnostics, this test affects the operation of all ports on the
adapter. (Not available on ESXi systems.)
• PHY Loopback Test - The PHY loopback test connects the transmit output of the physical layer
to the receive input of the physical layer. The data is transmitted, received and checked for data
miscompute errors.
• External Loopback Test - A diagnostic test in which a random data pattern is sent down to an
adapter link port. The data goes out the port and immediately returns via a loopback connector.
The returned data is subsequently validated for integrity.
• MAC Loopback - MAC loopback connects the transmit output of the MAC controller to the
receive input of the MAC controller (bypassing the PHY).