The EMX-DVI automatically compensates for the signal degradation caused by long video cable runs of up to 50 ft (15 m) on its input and can drive long DVI Cables on its output to 40 ft (12 m) by boosting and echo-canceling the DVI video output. By default, the unit is configured to buffer single link DVI or HDMI signals. Using a recessed pushbutton its mode can be changed to support Dual link TMDS signals. In most instances, when configured for Single Link extension, the unit can operate from the power available through the DVI source signal and no external power supply connection is required. The unit ships with a universal power supply to use if the power through the DVI input is insufficient. The power can also come from the USB connector on a PC. The DDC channel (that handles EDID and HDCP data) can either be by-passed through the EMX-DVI (so the source “sees” the connected LCD), or it can be Emulated, whereby the EDID is supplied from internal memory and HDCP is turned off (forcing the source to send non-content protected video without HDCP). The Emulated (internal) EDID data can be acquired from any connected LCD, or a custom EDID file can be uploaded via the USB port. The unit provides driver free USB 1.1 port connection to a PC. Free Windows™ PC software available on the website, allows reading, saving, manipulating, and writing EDID tables to and from the device. The EMX-DVI modes (Bypass vs. Emulate or Single-Link vs Dual-Link buffer) are also controllable via the USB port. In addition to the above, the unit provides DVI-I bypass for analog RGBHV (or VGA) signals, so it can manage EDID for VGA sources and displays using inexpensive VGA to DVI cables or adapters.