The Actiontec MDC AC97 Modem v2128D is a modem that uses the AC'97 (Audio Codec '97) interface standard, typically for dial-up internet connections and voice communications (e.g., faxing or telephony). This modem is an older hardware component commonly found in desktop PCs or laptops before broadband internet became widespread. The v2128D is the version of this modem, which typically refers to a specific hardware revision or firmware version.

To use this modem with a Windows computer, you need to install the appropriate driver, which allows the operating system to communicate with the modem hardware.