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White Paper on Sage ’ s Echo Sounder and Echo Generator

Sage Instruments Echo Sounder measures echoes in a telephone network. It provides complete information on multiple echoes in terms of echo level and echo delay. Echo Sounder also provides a reliable way of measuring round-trip delay, round-trip attenuation, and one-way delay and one-way attenuation. Sage Instruments Echo Generator generates multiple echoes with programmable echo delay and echo level. When combined with Echo Sounder, Echo Generator facilitates the G.168-type [1] of echo canceller test and the measurements of round-trip delay and round-trip attenuation. When working alone, Echo Generator serves as a simple remotely-programmable loop-back. The three most important parameters that affect voice quality in a phone network are voice clarity, echoes, and delay. Voice clarity depends on level, voice compression, noise, packet loss, jitter, and voice clipping etc. Along with Sage Instruments PVIT [2] (Packet-Voice-Impairments-Test that measures packet loss, jitter and voice clipping) and PSQM [3] (Perceptual-Speech-Quality-Measure that measures Mean-Opinion-Score (MOS) due to voice compression, voice level loss/gain and round-trip delay), Sage Instruments Echo Sounder and Echo Generator provide a complete set of test tools for characterizing the quality-of-service (QoS) of a telephone network.