ATC voice quality assurance ATC Area control center Air Navigation Service Provider (ANSP)

AVQA – Uncovering a codec mismatch

A controller calling an airport tower heard nothing but silence, even though every audio packet arrived. The culprit: a codec mismatch. The airport's device sent G.711 A-law while the ANSP device expected µ-law, the very codec the airport itself had proposed. A stark reminder that safety-critical comms can fail silently.

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ATC Area control center Air Navigation Service Provider (ANSP) ATC voice quality assurance

ROMATSA optimizes voice network monitoring with AVQA

Discover how ROMATSA transformed their monitoring and fortified critical airspace communications with AVQA.

ATC voice quality assurance ATC voice communications system (VCS) ATC radios

AVQA Advanced voice quality assurance system

ATC voice quality assurance ATC radios ATC voice communications system (VCS)

AVQA - frequency monitor

Long press PTT or simultaneous transmissions are serious problems in ATC voice communication. AVQA frequency monitor provides a great tool for analyses and alarming of such irregularities. Based on the non-intrusive voice monitoring, AVQA has a complete information about communication.

ATC voice quality assurance ATC radios ATC voice communications system (VCS)

AVQA - Ground-ground monitor

Voice quality assurance is key for safe airspace operations. The AVQA G/G monitor provides a detailed information on the G/G connection between controller working positions but also between centers and airports. The quality data are recorded with a granularity of five seconds, providing a very detailed statistics.

ATC voice quality assurance ATC radios ATC voice communications system (VCS)

AVQA - Air-ground monitor

Voice quality assurance is indispensable for airspace operations. AVQA A/G monitor provides a detailed information on the A/G connection between radio and VCS system. The fully flexible dashboard provides a high-level overview and allows a quick drill-down to the particular connection.

ATC voice quality assurance ATC radios ATC voice communications system (VCS)

AVQA - loopback monitor

AVQA loopback monitor provides a non-intrusive end to end test of the entire ATC voice communications system. Using the patented technology of correlating the ground-based receptions with the ground-based transmissions, the system provides non-intrusive analyses of the entire communication chain.

ATC voice quality assurance ATC radios ATC voice communications system (VCS)

AVQA - RSSI monitor

The RSSI monitor in AVQA provides a great opportunity for long-term signal and noise monitoring of the radio infrastructure. Using the flags in the ED-137 voice stream, AVQA non-intrusively analyzes the RSSI level. Based on the squelch information, AVQA automatically differs between the signal and noise and reports this accordingly.

Air Navigation Service Provider (ANSP) ATC voice quality assurance ATC Area control center

AVQA – Revealing an ED-136 violation

A real deployment showed MOS repeatedly dropping below the ED-136 required threshold of 4.0. AVQA helped drill down to the cause: packet loss and severe jitter. At the call level, 1 in 11 packets was lost, not enough to be obvious to controllers, but enough to flag for the network provider before it became a real problem.

Related solutions

Civil air traffic control

Civil air traffic control

Cellular network investigations

Cellular network investigations

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