Automated modem transmission testing platform
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Automated modem transmission testing platform |
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Introducing
the next generation of network test equipment The DSPGenie offers a highly flexible platform for all your testing and connectivity requirements |
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Benefits
of the DSPGenie MTT
Functional
Description The
DSPGenie modem transmission tester (MTT) is a multiple DSP based
testing solution that allows for highly auto-mated testing of the
behaviour of telecommunication network equipment with various types
of modems.
The
DSPGenie MTT is a flexible platform for a wider range of testing and
connectivity requirements that includes the same functionality as
the TextLink 9100MT( which allows semi-automated testing carried out
using Gallaudet/DSPG A wide range of I/O options allows the DSPGenie MTT to be used in virtually any test environment, and bespoke customisation can be done to tailor the platform for any requirements. The
I/O options include:
All standard error measurements obtain with the Gallaudet software can also be performed on DSPGenie MTT , including (but not limited to):
Text
telephony modems testing The DSPGenie MTT uses onboard DSP resources to emulate (in software) a range of low-speed modems used in text telephony including:
CTM and Baudot can be used either for PSTN or mobile communications Internal
operation The
operation of the DSPGenie MTT unit is controlled by built-in Single
Board Computer, with a standard monitor, keyboard and mouse
attached. Windows-based environment offers a simple and intuitive
Graphical User Interface Depending
on the operational mode selected, modem chipset are initialised
depending on the communication mode selected (CTM, Baudot, V.21
etc). Their digital I/O signals are routed using an internal TDM bus
to either the Audio
Modems A and B can be configured to support Wireless-to-landline or wireless-to-wireless calls Tester
main GUI Figure below shows the main GUI where the test can be seen in action. Form this window the user is presented with a list of modems to select from and allows to set up the modem configuration. As the DSPGenie MTT has knowledge of both transmitted and received data, the character error rate (CER) and bit error rate (BER) are easily determinable, and the results are repeatable. All the calls are logged and time stamped. The transmit data sequence is selectable from a range of predefined or custom entered files.
Multi–test
using the DSPGenie MTT to carry out automatic testing for Text
telephony Modems Using
the built-in multi-test mode the DSPGenie MTT can be configured to
perform automatic testing and any number of
Figure below is a snapshot of the tester in action indicating 2 completed tests for Baudot and CTM.
Testing
Scenarios
Data
and fax modems testing (Optional) Optionally, ITU-T standard data and fax modems can be emulated using an add on card containing Conexant CSM modem chipsets. The following data modes are available using this card:
Most commercially availability data modems use an auto-moding process during handshaking. This, together with variable rate operation (i.e. possible fall-back to lower data rate) can make testing difficult and unpredictable. The
DSPGenie MTT can be configured so that automoding (and fall-back) is
turned off and the modem is forced into a user-specified mode (and
data rate). Additionally, V.42 LAPM, MNP 2-4, and MNP 10 error
correction, V.42 bis
Data
modem statistics Through the CSM chipset, the DSPGenie MTT provides a wide range of valuable modem's connection statistics and status information, including (but not limited to):
The modem chipset implementations allow various answer tones to be sent from the receiving modem. These are completely user selectable for each modem. The following answer tones are available:
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