D-Link DXS-3400 SERIES - Page 25

DXS-3400 Series Lite Layer 3 Stackable 10GbE Managed Switch Web UI Reference Guide
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Figure 3-10 Loopback Test Window
The fields that can be configured are described below:
Parameter Description
Unit
Select the Switch unit that will be used for this configuration here.
From Port ~ To Port
Select the appropriate port range used for the configuration here.
Loopback Mode
Select the loopback mode here. Options to choose from are:
• None - Specifies not to enable the loopback mode.
• Internal MAC - Specifies the internal loopback mode at the MAC layer.
• Internal PHY Default - Specifies the internal loopback mode at the PHY
layer to test the default medium.
• Internal PHY Copper - Specifies the internal loopback mode at the PHY
layer to test the copper medium.
• Internal PHY Fiber - Specifies the internal loopback mode at the PHY layer
to test the fiber medium.
• External MAC - Specifies the external loopback mode at the MAC layer.
• External PHY Default - Specifies the external loopback mode at the PHY
layer to test the default medium.
• External PHY Copper - Specifies the external loopback mode at the PHY
layer to test the copper medium.
• External PHY Fiber - Specifies the external loopback mode at the PHY layer
to test the fiber medium.