DSPGenie MTT

Overview

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:

asd

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

Tester Operation

This DSPGenie MTT is pre-set and configured for 2-wire PSTN network as presented in the below Figure:

Figure: DSPGenie MTT with DAA interfaces

The DAA interface can be used in the lab conditions or with real PSTN networks. All the necessary network progress tones can be monitored and reported by the DSPGenie MTT.

The recognisable line conditions include:

No dial tone
Busy
Ringing

The DSPGenie software suite consists of two packages: client application with LabView based Graphical User Interface and server application designed to perform the modem transmission tests when used in conjunction with the DSPGenie hardware.
The software allows the user to configure and set up each parameter of the testing procedures through the client’s GUI. A single test or sequence of tests may be selected, and may be run completely automatically without any further user intervention.