Ajax Alarm Being Jammed — What Actually Happens and How to Detect It

1. What Is Signal Jamming and How Does It Work?

Signal jamming is the deliberate transmission of radio frequency (RF) noise on the same frequencies used by your Ajax alarm system to communicate between sensors and the hub. When a jammer floods the frequency band, the hub can no longer receive signals from its detectors — effectively blinding the system without triggering a traditional alarm.

Jammers are cheap, widely available online, and small enough to fit in a pocket. A burglar can walk past your property, activate a jammer, wait for your sensors to drop offline, and then break in — all while your alarm appears to be functioning normally from the outside.

2. What Ajax Actually Does When Jamming Is Detected

This is where Ajax separates itself from most wireless alarm systems. Rather than simply going silent when jammed, Ajax is designed to fight back — and to alert you and your monitoring centre even while under attack.

3. The Real-World Jamming Attack — What the Event Log Showed

The Facebook post that inspired this guide described a real burglary where an Ajax-protected Melbourne property was targeted with a jammer. The installer reviewed the event log after the fact and found a clear pattern that is now recognised as a jamming signature.

The key detail: all wireless devices dropped offline within 3 seconds of each other. This is the unmistakable signature of a jammer. Natural signal loss — from interference, battery failure, or hardware faults — almost never causes multiple devices to drop simultaneously. If you see this pattern in your event log, a jammer was used.

4. Are You at Risk? Who Jammers Target

Jamming attacks are not random. They require planning, equipment, and reconnaissance. The properties targeted are almost always pre-selected — burglars who use jammers are professionals, not opportunists. Understanding who they target helps you assess your own risk level.

5. How to Harden Your Ajax System Against Jamming

No wireless alarm system is 100% immune to jamming — but you can make your system significantly harder to defeat and ensure that even a successful jamming attack triggers an immediate, escalated response. These are the steps every Ajax installer and homeowner should implement.

Step 1 — Verify Your Monitoring Centre Has an E344 Protocol

Call your monitoring centre and ask specifically: “What is your response procedure when you receive an E344 jamming event from an Ajax hub?” If they don’t have a specific protocol — or treat it as a low-priority malfunction — push them to escalate it to an alarm-level response. Some monitoring centres can be configured to treat E344 as an immediate dispatch trigger.

Step 2 — Enable All Three Communication Paths on the Hub

The Ajax Hub 2 Plus supports Ethernet, WiFi, and cellular (SIM) simultaneously. All three should be active and tested. A jammer targeting the Jeweller band (868 MHz) does not affect your 4G cellular or Ethernet connection — these are the paths that carry the E344 alert to your monitoring centre. If your hub is running on SIM only with no Ethernet backup, a broadband jammer that also targets cellular frequencies could silence all communication.

Step 3 — Add Wired Sensors to Critical Entry Points

Wired sensors connected via the Ajax MultiTransmitter or Fibra protocol are immune to Jeweller jamming — they communicate over physical cable, not radio. Adding even one or two wired door contacts on your primary entry points (front door, rear door) means a jammer cannot fully blind your system. The attacker must physically cut the cable to defeat a wired sensor — a much more difficult and time-consuming attack.

Step 4 — Pair Ajax with Wired CCTV

Wired CCTV cameras are completely unaffected by RF jammers. A hardwired CCTV system running alongside your Ajax alarm means that even if every wireless sensor goes offline, your cameras continue recording. This is the single most effective deterrent against jamming attacks — burglars who use jammers know they can defeat wireless alarms, but they cannot defeat a wired camera system without physically destroying it.

• Enable all three hub communication paths — Ethernet + WiFi + SIM simultaneously
• Confirm E344 protocol with monitoring centre — push for alarm-level response, not malfunction
• Add wired sensors on primary entry points — MultiTransmitter or Fibra, immune to RF jamming
• Install wired CCTV alongside Ajax — cameras continue recording regardless of jamming
• Enable push notifications for all users — even if monitoring centre is slow, you get the alert instantly
• Keep Hub firmware updated — Ajax improves jamming detection sensitivity with each Malevich OS update
• Position StreetSiren visibly — deters reconnaissance; attackers prefer properties where the siren is hidden

6. What to Do If You Receive a Jamming Alert Right Now

If your Ajax app sends you a jamming notification or you see multiple devices drop offline simultaneously, treat it as an active intrusion attempt until proven otherwise. Here is the exact response sequence.

7. How Ajax Compares to Other Wireless Systems Against Jamming

Not all wireless alarm systems handle jamming the same way. Most budget and mid-range wireless systems simply go silent when jammed — they have no mechanism to detect or report the interference. Ajax’s approach is meaningfully different, though not perfect.

The bottom line: Ajax is one of the best wireless alarm systems available for jamming resistance, but it is not a complete solution on its own. The combination of Ajax + wired CCTV + professional monitoring with a proper E344 protocol is the professional standard for high-risk properties. See our Ajax vs Hikvision AX Pro comparison for a full system-level analysis, and our Ajax vs Paradox comparison to understand how older wired systems compare.

8. Melbourne Suburb Risk — Where Jamming Attacks Are Most Likely

Jamming-assisted burglaries in Melbourne are concentrated in suburbs with high property values, predictable occupant absence patterns, and a high density of wireless-only alarm systems. Based on Victoria Police crime statistics and our own installation experience, these are the areas where hardening your Ajax system against jamming is most critical.

9. Jamming Risk for Commercial Properties

Commercial properties face a different jamming risk profile to residential homes. The targets are typically high-value stock, cash, or equipment — and the attacks are often more sophisticated, involving multiple attackers and pre-planned entry and exit routes.

For all commercial properties, the minimum anti-jamming standard is: Ajax alarm with triple communication paths + wired CCTV on all entry points + professional monitoring with a documented E344 response protocol. High-value commercial sites should also consider 24/7 Ajax monitoring with video verification — where a jamming event triggers immediate visual verification by a monitoring operator before police dispatch.

10. What to Tell Your Insurer About Jamming

Insurance companies are increasingly aware of jamming-assisted burglaries. Some insurers now ask specifically whether your alarm system has anti-jamming detection capabilities when assessing your premium. Here is what you need to know when discussing your Ajax system with your insurer.

11. The Future of Ajax Jamming Resistance

Ajax Systems is actively developing improvements to their anti-jamming capabilities. Based on their public roadmap communications and firmware release notes, here is what is coming and what is already available.

The most impactful change Ajax could make — and the one most requested by professional installers — is reclassifying E344 as an alarm event rather than a malfunction. This single change would ensure monitoring centres treat jamming detection with the same urgency as a triggered sensor. Until that change is made, the responsibility falls on installers and homeowners to ensure their monitoring centre has a documented E344 response protocol. See our guide on what makes Ajax so powerful for the full picture of where Ajax leads the market.

Ajax Jamming FAQ