Fly with ASL

From arrival, to gate, to departure, ASL guides millions of passengers on their way. From a solution for a few gates, right up to huge multi-terminal installations, ASL delivers safety, information, and entertainment, 365 days a year.

Modern airports are sophisticated spaces with multiple roles, and with considerable security, installation, and operational challenges. ASL’s airport solutions include sector-specific products and powerful integration options. ASL help manage your challenges, whilst meeting your stringent and demanding safety criteria.

  • Fire and emergency staff can protect

  • Security and operational staff can engage

  • Retail and hospitality staff can perform

Peace of Mind

With more than 25 years experience of designing and developing Public Address and Voice Alarm products for the transportation market, ASL offers peace of mind. You can rely on ASL solutions to work, and to continue working, throughout the life of the system.

Our PAVA systems will deliver the message to where it needs to be heard, when it needs to be heard. Long, reliable, product life also means lower ownership costs and low whole life costs.

Eliminate Downtime

ASL’s decentralized architecture, built-in redundancy and automatic hot standby systems provide high availability, to keep your airport running. However, if something does go wrong, ASL’s modular hot-swap amplifier cards even allow maintenance while the system is live, while ASL’s ‘hardware bypass’ function enables local emergency microphones to operate even if the router’s CPU and DSP processing have failed.

Seamless Integration

ASL’s open source implementation, Linux Software Development Kit (SDK), and Windows DLL interface library (SIL), plus legacy I/O connectivity make integration to third-party flight information systems simple. ASL’s PAVA can be integrated with flight information systems to provide automated flight information announcements.

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We’re trusted by:


Major London Airports


International Airports


Protected Annually


Airports are ever changing and expanding. ASL’s future-proof audio-over-IP architecture and modular design simplifies installation, and allows systems to grow and adapt as your needs change.

ASL's iVENCS Control System provides intelligent artificial messaging for airports and airlines. The iVENCS GUI can be translated into different languages, and announcements can be stored and played in multiple languages, including text to speech.

ASL’s microphone user interface is also available in a number of languages, and new languages can be added as required.

ASL's powerful DSP Digital Signal Processing provides sophisticated EQ Equalisation Controls, while DANS Dynamic Ambient Noise Sensors and continuous noise compensation technology enables broadcast intelligibility to be optimised to cater for varying real-time ambient noise levels.

Interfacing to Active Array Speakers is simple, including speaker monitoring. End to end audio path monitoring is facilitated by the use of specialist audio monitoring tones, built-in to the ASL routers.

Airports and their terminals cover very large areas, often with equipment room nodes spaced widely apart. ASL’s IP networking capability allows equipment installed in remote locations to operate together as a single system, using dedicated failure-resistant redundant copper or fibre IP networking.

ASL understands that PA migration come with risks and often happen in stages. ASL systems can readily work with existing third-party PA systems either during a changeover phase or on a permanent basis to manage risk in a predictable way.

To secure the PAVA system and to ensure uninterrupted operation: ASL’s solution supports full encryption and authentication of control and audio data, including 2Factor authentication for tools and configuration management.

Sector-Specific Products

ASL combines close liaison with our customers and end users, technological innovation, and the comprehensive knowledge of our experienced team to tailor our products to industry-specific requirements, and to set new standards with our dedicated industry specific products. A few key examples are referenced below. All of which were designed in close collaboration with major airport authorities to improve the experience of your staff and customers.

Store and Forward

ASL’s MPS paging microphone range can be configured to store an announcement as it is made, and to then forward the audio for broadcast pending review. This prevents potential acoustic feedback in situations where the microphone is not isolated from the broadcast, such as at airport gates.




Vandal-Resistant Microphones

ASL’s VRMS range of airport-specific microphones are housed in IP65, vandal-resistant, flush mount stainless steel enclosures, making them ideal for public areas such as airport gates or podiums.

ASL also offers a wide range of other vandal-resistant products which are ideal for public areas.



Dynamic Volume Control

ASL’s DANS01 dynamic ambient noise sensor enables the PA volume level to be automatically adjusted in real time. These noise sensors feed audio from their PA zone back to the ASL router, where the DSP digital signal processor separates any broadcast audio from the ambient noise. Thus, the volume can be controlled in response to ambient noise, even during announcements.

This ensures the PA audio is at a comfortable level and intelligible, even if the noise level varies widely during a broadcast.



The iVENCS Control Software is a truly open and intuitive integrated management platform

iVENCS - Integrated Airport Control

ASL’s enhanced iVENCS Site Management System provides integrated distributed control

The iVENCS Control System has recently received an entire technology and GUI upgrade, consolidating its place at the forefront of the management of the public in large sites.

iVENCS is a truly open and intuitive integrated management platform which offers robust control, monitoring and incident analysis across all safety, security and communications subsystems. Plus, in addition to the standard subsystems and functions, iVENCS provides the flexibility needed to provide custom integrations with industry-specific  and site-specific equipment, such as Flight Information Systems.

iVENCS provides the ability to integrate and simplify the control of all aspects of airport management, with powerful and simple to use telecoms and security controls. System control and monitoring can be provided at a central control room and at distributed terminal workstations, all running from multiple redundant servers. Customised staff information screens and airport overview video walls can be provided, which combine alarm and status reporting with CCTV views.

The award-winning and unique true 3D GUI can show an accurate, fully scaled model of the whole airport or terminal. The model’s pan, tilt, rotate and zoom controls allow the user to move the viewpoint at will, to any part of the 3D airport model and to any floor, with seamless viewing from any position. This avoids other system’s need to split the airport GUI into multiple small 2D maps and false-3D building plans, requiring the operators to switch between many different maps in order to operate the airport’s equipment.

Key Features:

  • Award-winning 3D or traditional 2D GUI
  • System schematics and dedicated subsystem controls
  • Consistent and simple to use functionality, for multiple systems
  • Industry and custom site-specific integrations
  • Ability to provide advertising content onto displays
  • Remote Condition Monitoring
  • Distributed processing with multi-site redundancy
  • Modular system architecture; easily expandable
  • Cross-platform support
  • No ongoing license costs

Airport operators need to monitor an ever-increasing number of subsystems, from fire detection to CCTV, PA to information displays, access control to intruder detection, and far more. ASL’s award-winning iVENCS Control System empowers both managers and operators to simultaneously control a multitude of systems. Via the intuitive 3D user interface, staff can keep a constant eye on the public and on the status of equipment around the airport, are able to remotely control devices, and be alerted to any faults and devices that are in need of investigation.

iVENCS makes public and staff communications easier to manage, through auto-scheduled announcements, intelligent message builders, multi-lingual messaging, and information displays.


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