Model Number MX880121A-02 is a software option to the 1xRTT version of Anritsu's MTT8801C Radio Communications Analyzer. With the software installed, the MT8801C functions as a link layer for connecting 1xRTT wireless Internet devices to an external application server or to the Internet via an external server. A unique capability is its modem emulation mode. In this mode, the MTT8801C functions as a modem in Windows 2000™ to establish a remote access service (RAS)/point-to-protocol (PPP) connection between a mobile station and an application server.