User's Manual Part 1

Nomad User’s Manual Chapter 5 – Defining a Test
Copyright © Spirent Communications, Inc. 2013 42
sampling rates per channel pairs. The channel pairs are 1&2 and 3&4. Thus, if
channel 1 is set to Narrowband, channel 2 cannot be set to High Definition.
 Sampling Rate – The Sampling rate for audio associated with this channel.
 Scoring Model – The MOS scoring algorithm used to score audio. When the Audio interface
is set to High Definition, Channels 1 and 2 must be set to the same scoring algorithm, and
channels 3 and 4 must be set to the same scoring algorithm. Depending on the licensing and
hardware combination, the following scoring/audio interface combinations are possible:
o PESQ Scoring Algorithm
 For Nomad ME: The Narrowband, Wideband and Bluetooth options are
available.
 For Nomad HD ME: The Narrowband option is available through the NBx
port and over the air through the Bluetooth interface.
o POLQA Scoring algorithm
 For Nomad ME: The Narrowband and Wideband options are available.
 For Nomad HD ME: The Narrowband option is available through the NBx
port, the High Definition option is available through the HDx port and over
the air through the Bluetooth interface.
 Channel X – The Channel Audio area is used to manually adjust volume settings. If the
Input Level (downlink volume) and Output Level (uplink volume) are known for the
device on this test channel, use the sliders to set those values here. Otherwise, see Section
5.2.5 to automatically optimize volume settings prior to testing or Section 7.2 to manually
adjust volume settings during testing.
 Microphone Detect Mode – Enable this mode to support any handset requiring
recognition of an external audio input.
 Enable Bluetooth auto redial – This option allows Nomad to automatically redial the last
number called in the case of a dropped connection.
o In the case of a Bluetooth connection:
 Auto redial is available for all devices.
 Set the Audio Interface to Bluetooth.
 Check the Enable Bluetooth audio redial box and specify the number of
seconds to pause before redialing.
 With this configuration, a call that is dropped during testing will be
automatically redialed.
o In the case of an analog connection:
 Auto redial is available for phones which support the following options:
 Ability to maintain an analog and Bluetooth connection
simultaneously.
 Ability to transfer from a Bluetooth connection to an analog
connection.
 Ability for the Bluetooth connection to be re-established while the
phone is on the call.
 To utilize auto redial with a qualified device:
 Connect the test handset to the Spirent ME hardware using
Bluetooth (see Section 5.2.7 for Bluetooth connection instructions)
 Next, attach the test handset to the same channel using an analog
connection.
 Verify that the Bluetooth connection is still active.
 Set the Audio interface for this channel as Analog.
 Check the Enable Bluetooth auto redial option.
 Specify the number of seconds to Pause before redialing.