This shows both if the connection is dual-link or single link, and if the connection is DVI-A (analog with fewer pins), DVI-D (digital ... are getting the right type of cable for your connection ...

The block of nine pins to the right ... link, as it were. Where a second set of cable pairs is present, another set of red, green and blue signals can be sent, creating a second DVI link. A dual ...

Something, that is, like dual-screw locks on cable connectors ... given I'm quite literally still using a DVI-D cable right now to connect my second monitor (an old BenQ XL2411Z) to my PC.