User's Manual Part 2

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

9.11 Voice Delay Testing

Nomad allows the precise measurement of speech delay between two mobile devices connected to

the same Spirent ME unit. The measurement includes delay introduced by both handsets and the

time it takes to traverse the network.

High levels of delay (generally over 250 milliseconds round-trip) may impact typical conversation.

In the presence of high delay levels, normal conversation breaks down, as speakers are likely to

interrupt each other and speak over each other during the call. Additionally, delay can exacerbate

annoying echo problems.

Note: The Delay Task cannot be run with any other tasks. All other tasks must be removed from

the Test Setup screen before configuring a Delay Task.

To perform Voice Delay testing:

 Connect one handset to Channel 1(ME) or NB1(HD ME) via audio cable. Connect the

second handset to Channel 2(ME) or NB2(HD ME).

Figure 9-13 - Voice Delay Hardware Configuration

 On the Nomad Test Setup screen, configure Channel 1 as a Voice Delay task with the

following settings:

o Destination Channel: 2

o Cycles: The desired number of cycles to define the length of the test. The total

sample count for a test will be Cycles multiplied by Samples Per Cycle.