The AVM ISDN-Controller FRITZCard PCI is a hardware device that provides ISDN (Integrated Services Digital Network) connectivity for your computer, typically via a PCI (Peripheral Component Interconnect) slot. This type of card allows your computer to connect to an ISDN line for telephony or data transfer, providing high-speed internet and voice services in areas where broadband connections are limited or ISDN is preferred.

The FRITZCard PCI is produced by AVM, a well-known manufacturer of networking and communication equipment. The card is often used in environments that require dedicated ISDN connections, such as offices or homes in areas with limited access to broadband internet.

The Windows driver for the FRITZCard PCI (specifically for older versions like Windows XP and Windows 2000) allows the operating system to recognize and interface with the card, enabling it to provide ISDN services to the system.