After my used for remote maintenance purposes desktop PC was replaced by new hardware, the ISDN card could not be used easily because new PCs almost exclusively have PCI Express slots. ISDN cards for PCI Express slots are indeed available, but only in the upper price segment (from 300 euros). This adapter is thus a very cost-effective alternative. The operation of the FRITZ! Card PCI is therefore also in new computers running Windows 7 64bit so far without problems possible. A deduction of points there but because I had to work first with tin snips, pliers and file the slot bracket of the Fritz! Card until it mechanically secure fit in the adapter card. In addition, since PCI cards with a supply voltage of 5 volts to work, PCI Express cards, but operate at 3.3 volts, a four-wire cable is soldered to the adapter card for the power supply. Located at the end of which a so-called. Molex connector. But now have the actual PCs for internal power auxiliary components usually 15-pin S-ATA connector. It will therefore not come in most cases fail to appoint another adapter cable "S-ATA 15Pin Male to 4-Pin Molex" with.