User's Manual Part 2

Nomad User’s Manual Chapter 9 – Voice Quality Configuration Options

9.7 Base Station Simulator Testing

The Rohde & Schwarz CMU200 and the Agilent 8690 are two commercial base station simulators

commonly used to simulate radio conditions in a test lab. An optional Nomad upgrade provides the

cables required to interface to these pieces of equipment for degraded channel, noise cancellation

and other test scenarios. This interface allows the test handset to perform both sourcing and

recording functions, enabling handset testing without a landline voice server. Please contact your

Spirent Communications representative for additional information on this option.

To configure Nomad to work with a base station simulator:

 Load the desired test conditions into the simulator. Please see the manufacturer’s

documentation for simulator configuration details.

 Connect the test handset to Channel 1 on the Spirent ME hardware unit or NB1/HB1 on the

Spirent HD ME Unit.

 Connect the audio cable provided by Spirent Communications from the base station

simulator to Channel 2 on the Spirent ME hardware unit or NB2/HB2 on the Spirent HD

ME Unit.



Figure 9-7 - Base Station Simulator Hardware Configuration

 On the Nomad Test Setup screen, configure Channel 1 as a Mobile task with the following

setting:

o Session → Uplink Device: Base task on channel 2

 On the Nomad Test Setup screen, configure Channel 2 as a Base task with the following

settings:

o Session → Downlink Device: Mobile task on channel 1

o Channel Settings → Input: 205

o Channel Settings → Output: 195

 Confirm that both test channels use the same Scoring Model. Both channels must be set for

either PESQ or POLQA in the Session dialog.