Technical data

Troubleshooting 3
Agilent Mobile Voice MOS Test Application Getting Started Guide 45
Before starting the voice quality test, please make sure that
E6474A Voice MOS Test Office Utility is loaded and in a
ready state (The button in the lower middle must say “Stop
Test”). Also, it is good practice to empty CH1 through to
CH4 directories prior the voice MOS test. This way only the
current test data is stored in the directory.
Interference between the Maya device and phones may
introduce undesirable noise on internal audio processing. It
is recommended to separate them approximately 2 inches
(50 mm).
Repeatedly receiving low 1.0 MOS scores while testing Voice
MOS
The most likely reason for repeated low MOS score is a
miss- match of speech samples. Verify that the speech sample
on the E6474A Voice MOS Test Office Utility matches the
speech sample in the Sequencer Call Control Test properties.
The miss- matched samples will generate continuous low
MOS score in 1.0 range. Alternatively, verify that the correct
speech sample is played, by dialing and listening to the
speech playback.
Continuous Synch Time-out errors with Voice MOS test
The RCA connection to the Maya USB device might be
incorrect. This could be a wrong channel (you must use the
same channel as selected in E6474A Sequencer properties),
or Ear/Mouth (Analog IN/Analog OUT) connections are
reversed.
Also, if audio is heard through the phone (often the case
with some Nokia GSM/UMTS phones) it may be necessary to
disconnect and reconnect data cable so that the phone can
properly detect audio cables. Ensure that the phone is
neither muted or the volume is too low (at least half of max
volume on most phones).