User's Manual Part 2

Nomad User’s Manual Chapter 8 – Analyzing the Results
Copyright © Spirent Communications, Inc. 2013 106
8.11 Offline Scoring (Voice Quality Testing)
The ability to generate MOS outputs for .WAV files outside of an active test session is called Offline
Scoring. Use Offline Scoring to retrieve .WAV files stored on the Audio Server when uplink results
are not available during data collection and data must be retrieved after test completion. Uplink
.WAV files are stored on the Audio Server for three weeks after collection.
To perform Offline Scoring for files located on the Audio Server, start by accessing the Uplink
Scoring Utility:
 From the Data → Utilities tab, highlight Uplink Offline Scoring and click Launch Utility.
 Alternatively, access the Uplink Scoring Utility from the Modify Incomplete Logging
Session dialog on the Data → Incomplete tab.
On the Settings screen of the Uplink Scoring Utility:
 Confirm that the Audio Server settings are correct using the Validate Settings button.
 Select the Sample Rate as either 8 kHz (narrowband) or 16 kHz (wideband).
 Select the Scoring Model as either PESQ or POLQA.
 Select the appropriate narrowband or wideband reference audio file from the Audio Files
directory within the Nomad installation (likely C:\Program Files\Spirent
Communications\Nomad\Audio Files)
 Select a Logging Session option:
o Create a new logging session using offline scoring
 This option creates a local uplink file based on data stored on the Audio
Server for the selected call session and date / time range.
 The uplink .WAV files are also downloaded to the local machine.
 This option is to be used when the downlink file is not readily available, but
the collection times are known.
 This option might be selected when testing has been performed in the field,
but an office-based engineer requires access to the uplink results and / or
.WAV files.
 See Section 8.9.1 to create a merged uplink file using this method.
o Retrieve complementary uplink data for an existing Logging Session
 This option creates a local merged uplink-downlink file based on data stored
on the Audio server which corresponds to a locally stored downlink file.
 The uplink .WAV files are also downloaded to the local machine.
 This option is to be used when the downlink file corresponding to the
desired uplink file is readily available.
 This option might be selected when local access to the .WAV files is required.
 See Section 8.9.2 to create a merged uplink file using this method.
 Click Next to continue.