Network Simulation Software from GL Communications, Inc.

GUI Based Echo Canceller Testing -- XX062

 
 
GUI Based Echo Canceller Testing -- XX062 -- View Larger Image
GUI Based Echo Canceller Testing -- XX062-Image

This application allows you to apply delay, attenuation, and/or filtering to a received signal on any number of timeslots. Delay/Attenuate Timeslots is an "input-process-output" application, that is, a block of data is retrieved from the Rx Data Source; is processed by delaying, attenuating, and/or filtering it; and then retransmitting the processed block on the Tx Destination. You may also mix in additional signals from a number of sources, including

  • Speech and/or Noise signals from files
  • Speech signals inserted via VF input
  • Gaussian noise signals generated internally

Transmitted signaling bits may be Onhook/Offhook, user-specified, or passed through from received to transmitted timeslots.Click here to view the Delay/Attenuate Timeslots screen.

The Delay/Attenuate Timeslots application may receive and transmit on either one or two boards. There are a number of different operating configurations, the most common and useful are:

  • Looping back a processed signal - Applying delay, attenuation, and filtering to a received signal and retransmitting the processed signal on the same board on which it was received. Speech and/or noise may also be mixed in. Click here to view a diagram of this configuration. Note that the layout of the Delay/Attenuate Timeslots application dialog closely matches with this diagram.
  • Applying pure delay to a signal. A received signal is delayed before being retransmitted.
  • Inserting a Simulated Echo Loop. A two-board system is inserted into a T1 or E1 trunk and is used to simulate an echo path having known characteristics. Click here to view a diagram of this configuration.

The layout of the Delay/Attenuate Timeslots application has been designed to closely resemble the above block diagrams. Click here to view an illustration of this resemblance for one such configuration.


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GL Communications, Inc.
GL Communications, Inc.