Allied Telesis AT-2972T/2 - Manual (Page 132)

DOS Diagnostics
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D2. Phy Loopback Test
Function: This test is same as D1. Mac Loopback Test except, the data is
routed back via physical layer device. One Giga bit rate is used for this
test.
Default: Enabled
D3. RJ45 Loopback Test
Function: This is external loopback test. From the UUT point of view, no
loopback mode is configured. The data expected to be routed back by
RJ45 loopback connector. 100M/s and 1000M/s are used for this test.
Default: Disabled
D4. MII Miscellaneous Test
Function: This function tests the auto-polling and phy-interrupt
capabilities.
Default: Enabled
D5. MSI Test
Function:
Default: Disabled