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User's Manual Part 2

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Nomad User’s Manual Chapter 9 – Voice Quality Configuration Options
Copyright © Spirent Communications, Inc. 2013 115
9.1 Voice Quality Test Calibration
Spirent Communications recommends calibrating the Spirent ME or Spirent HD ME hardware used
with the Nomad system prior to testing for the first time to verify proper operation. To calibrate
the system:
Connect the provided Calibration Cable between Channel 1 and Channel 2 on the Spirent
ME unit or between NB1 and NB2 (narrowband) on the Spirent HD ME unit or between
HD1 and HD2 (high definition) on the Spirent HD ME unit.
On the Nomad Test Setup screen, configure Channel 1 as a Mobile task with the following
settings:
o Session → Uplink Device: Base task on channel 2
o Channel Settings → Audio interface for this channel: Analog Interface for
Nomad ME Units, Narrowband or High Definition for Nomad HD ME units.
o Channel Settings → Input Level: 225
o Channel Settings → Output Level: 180
o Channel Settings → Microphone Detect Mode: Confirm that this option is
unchecked
On the Nomad Test Setup screen, configure Channel 2 as a Base task with the following
settings:
o Session → Downlink Device: Base task on channel 1
o Channel Settings → Audio interface for this channel: Analog Interface for
Nomad ME Units, Narrowband or High Definition for Nomad HD ME units.
o Channel Settings → Input Level: 225
o Channel Settings → Output Level: 180
o Channel Settings → Microphone Detect Mode: Confirm that this option is
unchecked
Start a new test. The resulting MOS values for Channel 1 and Channel 2 should be 4.542
or higher, representing perfect audio. If this is the case, the unit has passed.
Connect the Calibration Cable between Channel 3 and Channel 4 on the Spirent ME unit
and repeat the test.
In the formatted Nomad output report generated with calibration test data, find results for audio
received at Channel 1 in the Channel 1 – DL area. Find results for audio received at Channel 2 in
the Channel 1 – UL area.
Figure 9-1 – Hardware Configuration for Voice Quality Test Calibration on a Nomad ME unit