How To Stop A Surveillance Camera Jammer

What jamming of a wireless security arrangement is and how to resist it

Radio communication is regarded as the main vulnerability of wireless security systems. It can presumably exist easily jammed using equipment that can be purchased "at every corner," and without radio communication, the alarm system is deprived of the opportunity to resist the intruders. Consequently, the facility becomes defenceless.

This commodity dispels the myths about jammers, talks most their real capabilities, and how counteraction is implemented in Ajax for this type of sabotage.

How radio communication is "jammed"

Jamming represents unlawful creation of interference within radio channels. It is used to forbid the communication of alarms within wireless security systems. Devices for jamming are chosen interference generators or signal suppressors and they are commonly known every bit jammers.

Interference generators operate within a specific radius at the frequency of the device whose operation is to be disturbed. If the frequencies of the device and the jammer practise non match, the jamming volition not touch on the performance of the device.

Jamming can be aimed at both individual detectors and the security system every bit a whole.

What types of jammers exist

Interference generator can "jam" a certain band or be broadband sabotaging several communication technologies of security systems simultaneously.

For example, Ajax uses v frequency bands for advice:

2G/GSM (900/1800 MHz) and 3G/UMTS (2100 MHz) networks of cellular operators
Wi-Fi network (2.4 GHz)
Jeweller radio communication (868.0–868.6 MHz or 868.7–869.2 MHz depending on the region)

Broadband interference generators that can jam several networks at once (for instance, Wi-Fi and GSM) can be:

Paw-held or portable with the size of a phone and relatively depression power; therefore, they prevent data transmission at a distance of 5-15 meters (without obstacles).

Stationary— such appliances are much more powerful and expensive. The higher the price, the greater the range and number of networks that they can jam. The wider the frequency band and the larger the jamming radius, the more powerful the interference generator must exist. Powerful jammers can become very hot, and they require boosted cooling. Also, the lower the jamming frequency, the larger the size of the interference generator antenna must be. All this affects the dimensions of the device, and jammers with a range of 100 meters (in open infinite) accept considerable dimensions, need forced cooling, and power supply of 230 Five.

Self-fabricated — equally a rule, low-power jammers that operate over brusque distances. In order to increase the jamming coverage, expensive broadband amplifiers are required, and the creation of such equipment involves specialized skills.

How the Ajax security system responds to jamming

Hub uses GSM and Ethernet for connection to Ajax Cloud service and for the transmission of alarms to the user and the security visitor, and Hub Plus is unique amidst the security system command panels — information technology uses iv authorized communication channels at the aforementioned time: Wi-Fi, Ethernet, and 2 2G/3G SIM-bill of fare slots. For communication with security system devices hub uses Jeweller radio engineering science.

1. GSM channel jamming

GSM channel jamming can only be successful if the GSM signal strength is weak. A potent signal is near impossible to jam due to the high power of the transmitter tower of a cellular operator.

When communication through the GSM channel is lost, "1" is added to the error counter (cherry badge) on the hub icon in the Ajax app.

Meanwhile, the hub continues to part properly via Ethernet (and/or Wi-Fi in Hub Plus). If other advice channels are unavailable or disconnected, the hub loses connection with the server that sends an alarm to the users of the security system and the security visitor. Meanwhile, the system continues to operate offline logging detector alarms and sending respective alerts using HomeSiren / StreetSiren sirens.

Once the connexion is restored, all alarms will be delivered to the application and the security company.

2. Jeweller frequency jamming

The hub and the devices connected to it constantly measure the noise level in the radio channel at Jeweller frequencies.

The Ajax security arrangement detects jamming if the dissonance ability level exceeds -70 dBm over thirty seconds. After that, the hub automatically sends a jamming notification to all users and the security visitor. Consequently, in lodge to avoid the loss of connexion, the hub switches to a less noise-polluted frequency.

Meanwhile, if the hub loses communication with the detector or the device, it sends the respective notifications to the users of the security system and the security company.

3. Wi-Fi jamming

When jammed, Hub Plus continues to operate properly via Ethernet and SIM-menu if these advice channels are used. When Wi-Fi is lost, "1" is added to the error counter (ruby badge) on the hub icon in the Ajax app.

If other communication channels are unavailable or disconnected, the hub loses communication with the server that sends an alarm to the users of the security system and the security visitor. Meanwhile, the system continues to operate offline logging detector alarms and sending corresponding alerts using HomeSiren/ StreetSiren sirens.

four. GSM, Wi-Fi, Jeweller jamming

Interference generators capable of jamming 2G/3G, Wi-Fi, and Jeweler bands at the aforementioned time over a big expanse (with allowance for the walls, ceilings, and objects that reverberate signals inside the premises) are overall and expensive devices that are not bachelor commercially.

Yet, if the robbers accept such a broadband interference generator, the Ajax security system will observe a loftier racket level at Jeweller frequencies and will transport the appropriate alerts to the users and the security company via Ethernet (if connected). In the Ajax apps, you volition come across that connections via Wi-Fi and 2G/3G networks are inactive. If the Ethernet connection is absent, the hub will lose communication with the server. The server will study the problem by sending an alarm to the users of the security arrangement and the security company.

How to protect the security arrangement from jamming

ane. Install the hub in a place hidden from third parties, away from doors and windows. During installation, remember that the location of the hub must ensure a stable signal strength for all Ajax devices.

2. Use all available advice channels.

If you have Hub: SIM-card and Ethernet.

If y'all have Hub 2: ii SIM-cards of unlike carriers and Ethernet.

If you take Hub Plus: 2 SIM-cards provided by different operators supporting 3G, Ethernet, and Wi-Fi from different admission points using the Internet from different providers.

If Wi-Fi and Ethernet connections are lost, Hub Plus switches to SIM-menu and uses the 3G network. If the information are not transmitted through the 3G Internet, the hub switches to 2G within seconds. If the problem is not resolved, it uses the second SIM-card post-obit the same logic: 3G as the principal network and 2G as a backup i. Moreover, it takes upward to 4 minutes to switch SIM-cards, while 17 minutes represents the standard for security systems.

The utilize of two SIM-cards will not protect against GSM jamming (since both SIM-cards use the same frequencies) but information technology helps in cases when ane of the SIM-cards stops responding for whatever reason. For case, due to a failure on the side of the cellular operator.

Summary:

Jamming of all available radio advice channels of professional security systems over a large surface area tin can only be achieved using overall and expensive interference generators.
A reliable security organisation does not rely on a single aqueduct of wireless advice with the outside world, and a wireless connection should supplement the wired connection to the Internet.
Even if intruders succeed in consummate isolation of a professional person security system, you and the security company volition be informed of the situation — due to scheduled security system polling by the server.
If communication with the security arrangement is lost, you should make it at the facility as soon equally possible. Security companies send rapid response teams in such cases immediately.

Source: https://www.digitaldirectsecurity.co.uk/what-jamming-of-a-wireless-security-system-is-and-how-to-resist-it.html

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