GlassProtect Fibra

GlassProtect Fibra

Wired glass break detector with a microphone

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Intruders can break silence, not security

Forget about the typical problem of glass break detectors — false alarms caused by barking dogs, traffic, water splashing, and extraneous noise. GlassProtect Fibra has a unique DualTone digital algorithm designed to minimize false alarms. The detectorʼs microphone responds only to vibrations characteristic of the glass breaking sound. You can adjust one of three sensitivity levels and run the test to check if everything works properly.

Discover GlassProtect Fibra

Introducing a wired glass break detector with a microphone

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Key features

Up to 9 m

glass break detection range


Up to 2,000 m

communication range with an Ajax hub1 or a module that extends the Fibra line

Up to 0.036 W

low power consumption

Dual tone

digital algorithm that prevents false alarms

180° glass break detection angle


Easy wiring

with removable device board

Adaptable to any facility

with 3 sensitivity levels

Remote control

Remote control and configuration

Informative push notifications

Ajax logo



Office: Glass breakage detected. GlassProtect Fibra in Warehouse.

Ajax logo


Manufacturing: Lid closed, GlassProtect Fibra in Office.

Two colours

2 colors

of matte enclosure


to connect a third-party NC detector

External connector

Fibra wired communication

Fibra wired connection

Power adjustment

Devices compatibility

Superior, Fibra, and Baseline product lines are mutually compatible. This opens up numerous possibilities for building systems of any configuration.

This is the wired device of the Fibra product line. Only accredited Ajax Systems partners can sell, install, and administer Fibra products.

Protect windows, valuables, and glass doors



Medical centre

Medical centre



Car service

Car service




Office or coworking



Discover future-proof hardware

Electret microphone

Electret microphone

Mainboard with terminals 

Mainboard with terminals

Tamper to prevent enclosure dismantling 

Tamper to prevent enclosure dismantling

Tamper to prevent detachment from the surface

Tamper to prevent detachment from the surface

Enclosure with mounting holes

Enclosure with fixing points

Perforated parts

Perforated parts for cable output either underneath the detector or through the wall

A screw to secure the enclosure

A screw to secure the enclosure

Responding to real threats only

GlassProtect Fibra uses a sensitive electret microphone to detect the sound of glass breaking and a DualTone digital algorithm to prevent false alarms. The sound of glass breaking consists of a low-frequency hit sound and a high-frequency crashing sound of shattered glass. Both sounds must be detected within 1.5 seconds for the detector to report an alarm. This two-stage glass break detection decreases the risk of false triggering. Additionally, one of three sensitivity levels can be configured in the Ajax app, making it easy to adjust the detector according to the conditions of any object.

Glass break detection

Note that GlassProtect Fibra precisely detects the breaking of glass that is not covered with a film. If a window or showcase is protected with any film or anti-shock cover, the sound will be muffled, and the sensor will not trigger. In such cases, we recommend using detectors with a shock sensor, such as DoorProtect Plus Fibra, DoorProtect G3 Fibra, or DoorProtect S Plus Jeweller.

Easy integration with third-party detectors

GlassProtect Fibra has terminals for connecting a third-party wired NC detector. This allows you to enhance system reliability with any NC detector, whether newly installed or already in place, such as motion, opening, or vibration detectors. For example, GlassProtect Fibra enables you to integrate an existing third-party2 opening detector into the system.

Opening detector

Vibration detector

Motion detector


Unique wired technology

An Ajax system uses secure two-way communication based on Fibra proprietary protocol. It features encryption and device authentication to prevent sabotage, spoofing, and data theft. Fibra lines are versatile and support connecting different types of devices to one line: sirens, keypads, and detectors with photo verification.

Unique wired technologies

Up to 2,000 m of wired communication with a hub1 or a module that extends the Fibra line

One line for different types of devices

Photo delivery via Fibra line without interference

Protection against sabotage and spoofing

Energy efficiency as a priority

Fibra communication requires minimum power consumption, with the detectorʼs consuming only up to 0.036 W at its peak. Fibra operates on the TDMA principle. Each device has a short time frame to exchange data with a hub, and its communication module remains inactive the rest of the time. This significantly reduces power consumption and helps avoid interferences even when multiple devices communicate simultaneously.

Power consumption of up to 0.036 W

TDMA and power-saving modes

Energy efficiency

System supervision

All Ajax devices perform automatic self-diagnosis and report their states to the hub. Essential parameters, including tamper, communication, power supply, and sensor statuses, are continuously monitored. The Ajax Cloud server controls communication between the hub and Ajax apps, ensuring instant notifications for ARCs, security companies, and users. In case of any malfunction or communication failure, an engineer is informed immediately to provide necessary services.

Automatic device self-diagnosis with status report

Regular polling to display the current device state on apps

Instant maintenance notifications

System supervision

Sabotage resistance

Tamper alarm

Tamper alarm

The glass break detector has two tamper buttons that alert system users and the Central Monitoring Station (CMS) of any attempt to open the enclosure or remove the device from the wall.

Protection against short circuits

Protection against short circuits

The Fibra protocol, combined with a DualTone digital algorithm, ensures reliable protection against unnoticed short circuits of the detector. If someone attempts to short circuit it, the device promptly notifies of a malfunction. The hub informs both the CMS and users about the incident.

Encryption of transmitted data

Encryption of transmitted data

All stored and transmitted data are protected by block encryption with a dynamic key. The encryption makes it extremely difficult for intruders attempting to connect to the detector with the intention of sabotage.

Device authentication against spoofing

Device authentication against spoofing

During each communication session, the hub authenticates the device by checking its unique parameters. If any parameter fails the check, the hub ignores the device commands.

Communication loss detection

Communication loss detection

The device regularly exchanges data with the hub. With minimal polling interval settings (3 data packages every 12 seconds), it takes only 36 seconds to detect communication loss and notify the security company and users about the incident.

Event notifications

Event notifications

The CMS instantly receives notifications of alarms and detector events. The information includes the time, device model and name, event type, and location room.

Next-level protection of Fibra line

Introducing LineProtect, the module designed to protect an Ajax hub and connected wired devices from sabotage when intruders cause overvoltage, short circuits, apply 110/230 V~, or use stun guns.

PRO is king

The myth that wired systems are difficult to install has been busted. Ajax has transformed what used to be an expensive, lengthy, and dusty experience for PROs by developing an ultimate set of tools to make the process easy and flexible, from project design to client support and system maintenance. Everything for smooth and quick installation is included. Intuitive Ajax apps help quickly make the device a part of the system, and each device can always be reconfigured remotely without site visits. No need for programmers — everything is available out-of-box.

Fibra power supply calculator

The online tool provides security specialists with detailed data on devices' power consumption, enabling easy pre-installation assessment of the wired system project. It facilitates real-time project designing, highlights problem spots, and offers solutions. Upon completion, results can be downloaded as a PDF file.

The installation kit includes all the necessary fasteners. For cable management, there are several perforated parts. The device board is removable, which makes the connection process more comfortable.

Removable device board

All the necessary fasteners included in the installation kit

Holding screw to secure the device on a mounting panel


Installers can add a device in two ways: by automatically scanning lines or scanning a QR code. When scanning lines, they can identify the desired device either by clicking in the app or by activating a tamper. Once a device is added by an installer, it immediately has a default name and settings suitable for most cases.

Pairing with a hub via line scanning or QR code

Device identification via triggering or LED indication

Optimal default settings


Forget about configuring via the keyboard. All testing and configuration can be done in mobile and desktop Ajax apps. An installer can work both on behalf of the company and as a sole installer.

Configuration and testing remotely and on-site

Desktop and mobile apps

Accounts for companies and installers


Using proprietary protocols, any Ajax system can transmit alarms to the PRO Desktop monitoring app and third-party CMS. When an alarm is received, the monitoring station operator knows what happened and where to send the rapid response unit. All Ajax devices are addressable, allowing the transmission of events, device type, assigned name, and room to PRO Desktop or third-party monitoring software.

Fully addressability of the device

Instant notifications in Ajax apps

Alarm and event monitoring in PRO Desktop for monitoring companies


Fibra technology

How to install a wired security system in 6 hours

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With U/UTP cat.5, 4 × 2 × 0.51 cable. Other cable types may have different values. Please use the Fibra power supply calculator to check the wired system project before installation.


GlassProtect Fibra can not power the third-party detector. The power supply for this detector should be connected separately.

Ajax product lines

Superior, Fibra, and Baseline product lines are mutually compatible. This opens up numerous possibilities for building systems of any configuration.

Glass break sensor for burglar alarm

The security of an object of any kind — housing, office, commercial building, involves the installation of a security alarm. It is able to protect the space from intrusions of strangers and theft of property inside. The security system includes an alarm control panel, and a number of security sensors, including a glass break sensor. Since it is easy to damage a window or door with a glass insert, and thus get inside the building, do not neglect the installation of detectors of this type.

How glass break sensors work

The glass break sensor detects acoustic or mechanical vibrations in the detection zone and transmits an alarm signal to the alarm control panel (central panel). The control panel, in turn, activates the sirens connected to the system and informs the users and the security company about the incident.

How to choose a glass break sensor for an alarm

The main difference between glass break sensors is the way information is transmitted from the sensor to the alarm central and vice versa. There are wired and wireless detectors.
  • It is advisable to install wired glass break sensors in rooms without repair, since this type of detector requires laying wires in the building. Also, wired sensors are used in large buildings with reinforced concrete walls and partitions, where radio communication can work less well.
  • Wireless glass break sensors can be installed in finished repairs. This type of detector does not require wiring, data is transmitted to the alarm control panel via radio signal.
Also, the response range of the security break sensor and temperature indicators are important. The climatic conditions of the building must match the operating range of the detector for its correct operation.

GlassProtect Fibra wired glass break detector from Ajax

The GlassProtect Fibra wired glass break detector is intended for installation inside buildings, close to windows or doors with glass elements. GlassProtect Fibra is a glass break detector that works in the Ajax security system. The detector communicates with the control panel using the secure Fibra protocol. The communication range of the sensor with the control panel is up to 2 km when connected via U/UTP cat.5 twisted pair cable. The GlassProtect Fibra sensor works with the Hub Hybrid Alarm Central and cannot be connected to other hubs, radio signal repeaters or third-party control panels.

The principle of operation of the wired GlassProtect Fibra glass break detector

The GlassProtect Fibra tire glass break detector detects glass breakage using a pre-installed electret microphone. The detector's microphone responds to sound vibrations that are characteristic of the sound of glass breaking. After the sensor detects a glass break, it immediately transmits an alarm signal to the security system control panel (central). The control panel, in turn, starts scripts, turns on sirens and informs users and the security company about the incident. The wired glass break detector uses a two-stage algorithm to filter out false alarms. In order to register a break, the detector must record a dull sound from a blow in 1.5 seconds, and then a sonorous sound of fragments falling to the floor. Thanks to this principle of operation, the glass break detector does not react to the sound of barking dogs or passing cars. It is important to remember that the GlassProtect Fibra wired break sensor detects glass breakage without film. If the window or showcase is covered with sunscreen, anti-shock and other types of film, the sound will be muffled, and the sensor will not work. To fix this type of glass break, use sensors with an impact sensor: DoorProtect Plus Fibra or DoorProtect Plus.

How the GlassProtect Fibra security glass break detector communicates with the alarm central

For data and alarm transmission, the glass break detector uses a two-way Fibra data bus protocol. This technology provides fast and reliable communication between the central security system and other devices. Thanks to the bus connection method, Fibra delivers information on time, even if 100 devices are connected to the system. Fibra technology encrypts the device on every connection to prevent sensor tampering and tampering. Thanks to the work based on the Fibra protocol, the control panel's sensors are regularly polled with a frequency of 12 to 300 seconds to control communication with alarm devices and display their statuses in real time in Ajax applications.

Installation of a wired GlassProtect Fibra glass break detector for alarms

GlassProtect Fibra alarm breaking sensor is a device of the Fibra line of wired devices. Only accredited Ajax partners can install, sell and administer these devices. When choosing a place to install the GlassProtect Fibra wire break sensor, it is important to pay attention to:
  • cable length for sensor connection;
  • Fibra signal level;
  • glass break detection zone;
  • no obstructions between the sensor and nearby glass surfaces.
Wired glass break sensors should be installed by professionals. It is they who know the best places to install alarm detectors.