As the photo shows, the pins are wired "straight across", rather than diagonally. This means that it does not work as an Ethernet/8P8C coupler because the transmit pins are mapped to unused pins (for 10/100 Mbit/s at least). Likewise, it doesn't act as a crossover either.
Is it wired wrong? Or is it a special form of a 1000Base-T crossover? Or is it perhaps used to correct the pins from another reversed device...?