The UD-7400PD docking station can drive up to a maximum of five external displays, using a combination of two different technologies.  

The dock provides one HDMI video output port driven by the USB Type-C video output of the host computer. This HDMI port is labeled with a number ‘1’ and the words, ‘Alt Mode’.

Please note, the host computer’s USB Type-C port must support video output in order for the ‘Alt Mode’ HDMI video output port to function.

The dock has a DisplayLink DL-7400 chipset that can drive up to four displays. One of these four outputs is routed to the dock’s second HDMI video output port. This HDMI port is labeled with a number ‘2’ and the word, ‘DisplayLink’.

The dock provides three ‘downstream USB Type-C ports.  In addition to USB data transmission, each of these three USB-C ports can also provide a video signal driven by the DisplayLink DL-7400 chipset. These ports are labeled ‘3’, ‘4’ and ‘5’ and the words ‘USB 10Gbps + DisplayLink Video’.

Displays with USB-C video inputs can be connected to these ports using full featured USB Type-C cables.  

Displays with different video inputs such as HDMI or DisplayPort can be connected by using USB Type-C video adapters or cables, such as the Plugable USB-C to HDMI adapter (USBC-HDMI) or the Plugable USB-C to DisplayPort video cable (USBC-DP)