The ASUSCOM ISDN Adapter Master Device (PCI Bus C) is a hardware component, likely an ISDN (Integrated Services Digital Network) adapter, which is used to provide high-speed digital telecommunications over a telephone line. ISDN is a technology that was widely used before the rise of broadband connections (like DSL or fiber optics) to offer faster internet access, telephony, and other digital services over standard phone lines.

The ASUSCOM ISDN Adapter Master DevicePCI bus.

The Windows driver for the ASUSCOM ISDN Adapter is needed to allow Windows to communicate with the ISDN card and enable its functionality for telecommunications or internet connections.