The EV8680 Evaluation Kit comprises a single board containing a CMX868 V.22 bis Modem IC, line interface components and a PIC C with serial communications port for interfacing to a PC. AT Commands are used to control the evaluation board via standard terminal emulators. The board is powered from a single 8 - 14V dc power supply; an on-board regulator and two discrete components set VDD to provide 2.7 Volt or 5.0 Volt operation. LEDs indicate carrier detect and hook relay status. The CMX868 may be driven from an external clock, or from the on-board crystal oscillator. Removal of jumpers allows the user to measure device current and also to disconnect the `C-BUS' control lines from the on-board C to allow control from an external system. Important signals can be monitored via test points and header pins.