New DSLA3 Hardware

The new DSLA3 is a modular system that enables analog and digital Audio and voice testing without connectivity limitation. Ready for current and future technology (4G-5G & 6G, Hi Definition sound, Wi-Fi, Bluetooth etc.). It is used to qualify, audit, troubleshoot, monitor any voice or audio media centric service, equipment & network. The DSLA3 comes from a long history of proven efficiency, quality, and robustness.

Capture All Influences on Your Voice Quality

MultiDSLA is the most accurate measurement system for Voice Quality Testing and voice End-User Experience Assessment and accordingly is used by most leading voice/UC organizations worldwide as the reference measurement for applications ranging from mobile to edge technology development to network operations.

In addition to objective and standards-based voice quality scores such as PESQ, POLQA, PEAQ and audio MOS, MultiDSLA offers waveform analysis, smart analytics and key performance indicators (KPIs) to help you identify the root cause of distortions in the degraded voice signal.


The new DSLA3 chassis is a 6 slots device, offering the capability to manage up to 6 channels in a 2U rackable device. it supports an LCD display standalone basic configuration such as setting management IP address.


Performing tests with DSLA3 does not change the way you run your tests. It has the same GUI and API as the DSLA2.

Key Features

Audio & Voice Quality Test System for Voice Engineers and Support Teams

Voice Quality of Experience

  • delivers true audio voice quality as perceived by the human ear

Standards Based Analysis

  • accurate and repeatable measurements based on international standards (PESQ, POLQA®)

Test Script Design Flexibility

  • GUI-based scripting engine enables you to create any audio band test you need (a full list of measurements is given below)

Smart Analytics

  • full drill-down and detailed graphical analysis helps isolate the exact artifact causing the problems quickly

Seamless Integration & Automation

100% Open API

  • rich stack of APIs PYTHON, APPIUM, Restful, PERL, Tcl, and HyperTerminal libraries support with wrappers including “on-deck” mobile control (allows integration with any quality test automation software)

The MultiDSLA Controller centrally automates call set up and measurements between any MultiDSLA Nodes in your voice network. Tests occur according to a pre-defined schedule or on demand with a simple to use graphical representation of the network. Test nodes maybe located anywhere reachable with an IP address.

Scalable Architecture

  • scalable architecture makes it usable from the product lab environment to enterprise network operations

Universal Connectedness

You can connect to your network or create an access point to relay the smartphone control command to the tested smartphones, thanks to DSLA3 Wi-Fi 5 capability.

MultiDSLA has comprehensive options to control the device under test ranging from:

  • basic call establishment prior to testing for mobiles
  • sophisticated on deck mobile device application interaction
  • tools for desktop workstation control for testing softphones


MultiDSLA application can be placed in the cloud without the need of firewall or port. The management connection is an upstream flow towards MultiDSLA application, giving the capability to deploy DSLA3 on remote sites.

Advanced Analytics

Note: Basic Signal Analysis Concepts are covered here.

However, MultiDSLA is a mature product with advanced measurement capabilities, all available through the GUI and API. They include:

  • network metrics – one-way delay, packet loss, jitter buffer behavior and echo
  • speech & noise level
  • codec distortion
  • rich codec library
  • Voice Activity Detector (VAD) performance
  • call setup analysis
  • stereo signals
  • signal with defined levels of white and pink noise
  • DTMF sequences
  • ability to generate network impairments such as a distribution of packet loss and jitter
  • and many more

MultiDSLA is the most versatile voice quality test solution. It offers unrivaled ease of use and can perform the most complex test processes, controlling 100+ nodes.

Physical Interfaces

  • analog & cellular test nodes
  • handset module
  • 4 wire RJ22 female
  • female Jack 3.5 mm for direct LRGM/LRMG connection
    • female Jack 3.5 mm for control
    • female Jack 3.5 mm for sync
  • line module
  • 2 wire FXO interface
    • female Jack 3.5 mm for control
    • female Jack 3.5 mm for sync
  •  VoIP & Volte nodes – SIP/LTE measurement endpoints

Modules Under Development

  • USB type C interface – includes power charging
  • bluetooth
  • ISDN and TDM interface

The MultiDSLA nodes are capable of generating voice signals at precise levels and measure the key performance indicators configurable via the controller. Any selection of node types can be configured. The user interface is consistent and the test process remains identical, regardless of which node types are being used, making the system easy to learn, easy to use and supremely flexible.

Configure a system for your test application – VoIP service to analogue PBX, mobile to PRI, soft phone to POTS, BRI to Bluetooth, and so on.

Perceptual Measurements

The Opale Systems DSLA3 supports the full range of perceptual speech and audio quality or clarity measurements:

      • POLQA (ITU-T P.863) versions 1.1 and 2.4 and 3.0
      • MOS, E-Model (ITU-T G.107)
      • PESQ (ITU-T P.862)
      • PESQ LQ /LQO (P.862.1)
      • PESQ WB (P.862.2)
      • PAMS (ITU-T P.800)
      • ITU-R PEAQ

Comprehensive Range of Traditional Voice & Audio Measurements

      • Voice Power Level
      • Echo (Level and Delay)
      • DTMF
      • One-way Voice Delay/Latency
      • Frequency Response NB/WB/SWB/FB
      • Signal Level
      • Noise Level


LAN with data load. Speech quality poor. Packet iframe loss visible as negative excursion in the error surface. Loss of synchronization near end produces “squeak” effect.

QA & DevTest – Flexible Automation Engine

  • unparalleled granularity of single tasks to be automated
  • tasklist editor enables you to play, control, wait or trigger any event at will

Management Reports

  • SLA management – set up your pass/fail criteria for any KPI
  • monitor your one-way delay, jitter, MOS, echo, speech levels, etc
Connections Report
Trend Report

Speech Recognition

  • suitable for functional automated testing of IVR routing plus speech-to-text libraries and SDKs

EVS Ready

  • test EVS on your network, chipset, or device and validate the new performance obtained

Voice & Audio Streaming Integrity

This unique way to assess your performance of audio streaming over Bluetooth or Wi-Fi detects and records any break or distortion over long test durations. It is specially designed for voice control systems (Amazon® EchoTM), car audio systems, or cordless loudspeakers.

Audio Streaming Integrity (ASI) – 5/6
Audio Streaming Integrity (ASI) – 3/6

Under ideal conditions, the Bluetooth or Wi-Fi streaming process has no effect on the listening experience, which is governed principally by the factors mentioned above. But under non-ideal conditions the streaming process can give rise to breaks in the decoded audio delivered to the loudspeaker or headphones. Potential causes of non-ideal performance include:

      • unsuitable paring combinations
      • radio-frequency interference, e.g., Wi-Fi interference to Bluetooth
      • multi-path signal fading due to radio signal reflections
      • equipment used close to the limit of its range


Signal Generation

      • signal sampling rate up to 96 kHz for future standards
      • any user-supplied speech material in WAV or PCM format, generated with user-defined mean active speech level with setting range -99dBm to +10dBm
      • sine wave, including swept and noise 20Hz to 22kHz, setting range -99dBm to +10dBm, any duration
      • DTMF setting range -99dBm to +10dBm, any duration
      • DTMF user-defined twist, frequency offset and break duration
      • conversational speech with/without double-talk
      • two independent tracks on each DSLA channel to create Complex mixed signals, e.g., speech plus noise


      • linearity 0.1dB for levels -60 to +10 dBm
      • linearity 0.1dB for frequencies 20Hz to 22 kHz
      • noise floor -85dBm or better
      • range of measured levels -75dBm to +19dBm
      • minimum measurable mean active speech level -65dBm

MultiDSLA Host PC

Minimum Recommended Specs MultiDSLA Controller
CPU Intel Core i5 processor or equivalent
Memory 2 GB
Network Interface Windows Server 2012 R2, Windows Server 2016, Windows 7 Professional SP1, or Windows 10 Professional
Screen Resolution 1024 x 768 pixels


Specification MultiDSLA Controller
#Nodes supported 100’s (depending on number of simultaneous tests required)
Controller Seats
(Add’l User Interface Application)
MS SQL Database Can reside within MultiDSLA Controller PC or on an independent server

Measurement Summary

Specification MultiDSLA Controller
Scores POLQA Version 3, PESQ, E-Model, PEAQ with graphical analytics
Supported Measurement ITU Standards • ITU-T Rec. P.56: Mean Active Speech Level
• ITU-T Rec. P862, P862.1, P862.2: PESQ
• ITU-T Rec. P863: POLQA
• ITU-R BS. 1387 : PEAQ
• ITU-T Rec. G.107 E-Model
Signal Levels Mean Active, Peak, and RMS speech levels
Delay Mean Active, Peak, and RMS speech levels
Echo • Up to three echos, level, loss, delay (analog domain)
• Simulation of echo signal and delay for echo cancellation performance assessment

To learn more about MultiDSLA, please contact us.

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