The DSPGenie Modem Transmission Tester (MTT) is a multi-DSP based testing platform that allows for highly automated verification of the behaviour of telecommunication network equipment with various types of modems. Configured for use with two-wire DAA interfaces allow the DSPGenie MTT to be utilised in most PSTN and PSTN-like environments, where the POTS-type modems are expected.

The DSPGenie MTT uses onboard DSP resources to implement a range of low-speed modems used in text telephony, including those defined in the ITU-T V.18 recommendation:


  • V.18
  • V.21
  • V.23
  • Bell 103
  • Baudot
  • EDT
  • DTMF text
  • CTM

The DSP implementation also supports some special protocols

  • DTMF signaling (keypad)
  • DTMF security protocol SIA DC-05
  • VCO mode for text modems

The MTT utilises Rockwell/Conexant (Mentor) modems that support most of the standard ITU-T data modem protocols: V.21, V.22, V.22bis, V.23, Bell 103, Bell 212, V.32, V.32bis, V.32ext, V.34, V.90, V.92