79. AQM with ACU R2

This AQM method is primarily used to measure audio quality during CS voice calls. Each mobile device is connected to an Audio Capturing Unit (ACU R2), which relays the audio to the PC. The ACU R2 supports connection of up to four mobile devices.

AQM with ACU R2 can be realized in a variety of hardware configurations:

Each of these setups can be expanded up to the full capacity of the ACU R2, meaning that up to four phones can be connected to each PC used. The setup types can also be mixed in various ways. Examples are given in the diagrams in section "Measurement Configurations in Detail".

AQM with ACU R2 makes use of the Voice Quality activity in Service Control scripts (see section "Voice Quality").

An ACU R2 can optionally be used in AQM configurations for (on-device client) VoIP as well. This makes no difference to the testing setup, except that the ACU R2 must then be selected as audio source in the Voice Quality activity. Again, see section "Voice Quality". This possibility is not further commented on or exemplified in the present chapter.

Finally, an ACU R2 can also be employed to measure audio quality for arbitrary voice services. This is the topic of section "AQM for Generic Voice Services".