• Analogue & Cellular Nodes
    Analogue & Cellular Nodes
  • DSLAIIC Front Panel
    DSLAIIC Front Panel
  • DSLAIIC Rear Panel
    DSLAIIC Rear Panel
  • DSLAIIC6 - 6 Voice Channels
    DSLAIIC6 - 6 Voice Channels
  • DSLAIIC6 Front Panel
    DSLAIIC6 Front Panel
  • DSLAIIC6 Rear Panel
    DSLAIIC6 Rear Panel
  • VoLTE - Interfacing with Anritsu MD8475A
    VoLTE - Interfacing with Anritsu MD8475A
  • Analog PBX Voice Quality Testing
    End to End Voice Quality Testing using DSLA line ports
  • Cellular Phone Voice Quality Testing
    Mobile Voice Quality Testing using DSLA handset ports
  • Analog to SIP Voice Quality Testing
    Analog to SIP Voice Quality Testing using DSLA and VPP
  • VoLTE Quality Test using Anritsu MD8475A Emulator
    VoLTE with Anritsu Base Station Emulator

analog & cellular nodes

DSLA - Highest accuracy, smallest footprint

DSLA Node is used for testing involving cellular phones, desk phones, analog (POTS) phone lines, ATA's, PC sound cards (for soft phones), and audio streaming devices.

  • The Digital Level Speech Analyser, or DSLA is available in a 2 Channel, 4 Channel (C4), and a 6 Channel (C6) configuration.

  • DSLA nodes incorporate several interfaces:
    • Telephone,
    • Handset,
    • 4-wire balanced analog interfaces (2-Channel version only)

  • The C4 and C6 are rack-mountable and share the same features as the 2 Channel unit, except the 4-wire ports.

  • DSLA offers the highest quality analog interfaces available, yielding precise measurements of the device or network under test.

  • DSLA has a small footprint, can be free-standing or rack mounted, and has no external controls or adjustments - making it ideal for deployment in customer premises, for example.

  • DSLA utilizes GPS for accurate measurements of one-way delay between remote locations and to give location/time records for drive test applications.



universal node for any voice network access technology

MultiDSLA uses the DSLAII analog nodes to generate and measure speech and other signals in the analog domain.  This method of assessment is largely ‘network agnostic’ because the test system does not need to be aware of the technology in the network – in just the same way that human users of a telephony network do not need to understand the technology in order to use it.

A call is made between handset and telephone (or two handsets, handset and laptop, etc.)

Speech signal is injected into A and passes through the network

Received signal at B is captured and analysed

Analysis provides MOS estimate, delay, received speech level, etc.

The process is repeated for the other direction and other voice(s)

MultiDSLA Controller sequences tests and displays/stores results

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Title/Description Download
MultiDSLA Nodes Spec Sheet - English
List and descriptions of MultiDSLA Nodes Specs

2.1 MB


DSLA Technical Specifications

Technical Specs




 Channels 2 4 6
Dimensions (mm) 72h x 218w x200d 85h x 425w x 387d
Net Weight 3 kg 7 kg
Power 100-240V ac
9-18V dc, 12W
 100-240V ac
Operating Temperature Range

-2 to +40°C

Approvals & Compliance


Calibration Cycle 3 Year
Front Panel Interfaces (per channel pair)

1 x balanced and floating input (600 ± 0.1 Ω or 1 MΩ) and output (600 ± 0.1 Ω) on 4mm sockets

1 x 3.5mm jack for control purposes

2 x RJ11 Telephone line ports (600 Ω or complex impedance).
Output level limited to +6dBm. DTMF or Pulse dialling

2 x RJ22 balanced and floating handset input (10kΩ) and output (25 Ω).
Output level attenuated by 28dB. Network isolated.

Monitor output(s) with switching/mixing of input and output of each channel pair

Back Panel Interfaces (per channel pair)Back Panel Interfaces (per channel pair)

1 x 10/100 Mbps Ethernet, IPv4 for each channel pair

1 x RS232 9-way serial for each channel pair

2 x 3.5mm jacks for external synchronisation and control purposes (2 Channel DSLA)

4 x 3.5mm jacks for external synchronisation and control purposes

2 x 3.5mm jacks for external synchronisation

Test Signal Generation

Signal Generation



Any user supplied speech material in wav or PCM format, generated with user defined mean active speech level from -99dBm to +10dBm

Sample Rates

8k, 16k & 32k or 8k, 16k & 48k

Sound file output levels

-99dBm to +10dBm
Sine & Swept Sine Waves 20Hz to 22kHz
-99dBm to +10dBm
any duration
Noise White, Gaussian White, Pink
-99dBm to +10dBm
any duration
DTMF -99dBm to +10dBm, any duration
user definable twist, frequency offset and break duration
Complex Mixed Signals

Two independent tracks on each channel to create any complex mixed signals

Measurement Performance

Measurement Performance


Speech Level Measurement

ITU-T P.56 Method B


Linearity 0.1dB for levels -60 to +10dBm
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
Dynamic range of balanced inputs 110dB
Double Talk Detection Percentage of measurement period where speech is present on both channels

GPS (time and position)