ISJ hears from Mick Dunne, General Manager, GJD Manufacturing.
Ask most site managers whether their facility is secure and you’ll almost always get the same answer: yes. Push a little further, ask them to walk you through their security layers and a familiar pattern tends to emerge.
Cameras at the entrances. Alarms on the doors. Motion sensors scattered around the building. It’s solid stuff. Reassuring even.
But there’s a more uncomfortable question buried underneath all of that: where does your system first detect an intruder? Not where it records them.
Not where it triggers an alarm after a door has already been breached. Where does detection begin?
For the majority of commercial and industrial sites around the world, the honest answer is ‘at the building’. Sometimes inside it.
By that point, the intruder has already crossed your boundary, crossed your grounds and arrived at the very asset you were trying to protect. You haven’t prevented an incident. You’ve documented one.
The three-opportunity problem
In my view, there are three distinct opportunities to detect an intruder before they reach your key assets.
The first is at the perimeter, the boundary of the site. The second is in the open ground between the perimeter and the building. The third is at the building itself: doors, windows and internal spaces.
Many security systems are built almost entirely around opportunities two and three. Cameras, PIR sensors, door contacts, glass-break detectors, all solid technology, all genuinely useful and all positioned to catch a threat that has already entered your site unchallenged.
The first opportunity, the perimeter, is too often left unprotected or under protected. Sometimes it’s a budget decision.
Sometimes it’s a perception issue; a fence feels like security even when nothing is monitoring it.
And sometimes, frankly, it’s a knowledge gap. If you’ve never been shown what a proper three-layer perimeter system looks like, you don’t know what you’re missing.
Response time
The reality about response times is that they’re almost always longer than site managers assume, and in many locations they’re much longer.
Research finds that while the majority of security system owners expect a police response within 10-30 minutes, actual times in many municipalities can run upwards of 146 minutes.
Even in well-resourced urban environments, urban areas average a 5-7 minute response time, while rural areas can exceed 15 – and that’s for the highest-priority calls.
For the kinds of sites that most need robust perimeter protection – power substations, water treatment facilities, pipeline infrastructure, remote industrial compounds – response windows at the longer end of that range are the norm, not the exception.
An intruder who crosses an unmonitored perimeter has that entire window to work in. They’re not being detected, they’re not being deterred and nobody is being notified.
The alarm doesn’t trigger until they’re already at the asset. Build a properly layered system, one that detects at the perimeter, and that same response window starts working in your favour.
The intruder is detected the moment they cross the boundary. The response is initiated immediately. The clock starts early.
What genuine perimeter protection looks like
Perimeter detection isn’t one thing.
It’s a category of technology that includes fibre optic sensing on fence lines, long-range passive infrared motion detectors and external illuminators, white light and infrared, that both enhance camera performance in low-light conditions and act as a visible deterrent before anyone gets near anything of value.
A project that illustrates this well involved protecting a large decommissioned chemical production site, a factory and warehouse complex with a four-mile perimeter, to be monitored entirely remotely with no personnel guarding.
No power or data cabling. Minimal installation disruption. A genuine operational challenge.
The solution was built around GJD’s LX LoRa Connect system, a long-range wireless platform capable of covering distances up to 10km.
LoRa-connected motion detectors were deployed around the perimeter and integrated with on-site cameras and an Alarm Receiving Centre, allowing PTZ cameras to immediately focus on any detection point.
GJD hybrid illuminators, combining infrared and white light LEDs, completed the picture. The whole system was operational within three days and delivered a security response capability within ten minutes of any alert.
The threat landscape is shifting the stakes
It’s easy to argue this has always mattered and most sites have managed. But the threat environment is evolving in ways that make perimeter detection more important, keeping us security personnel on our toes.
Drone-based reconnaissance, AI-assisted approaches to defeating detection systems and coordinated attacks on infrastructure are all pointing in the same direction: the perimeter is where intervention has the most impact, and where the cost-benefit of early detection is strongest.
Once a determined actor is inside your wire, the equation changes entirely.
The sectors feeling this most acutely are those protecting critical national infrastructure. These are operational realities playing out across every continent, and where the difference between a half-protected and a fully protected site carries consequences well beyond a single insurance claim.
There is nothing complicated about what I’m describing. The tech exists; it’s mature and it can be deployed cost-effectively across sites of almost any size or configuration. The barrier isn’t technical – it is about education and awareness.
If your security design starts at the building, it’s time to take a few steps back. The first line of protection should be the boundary of your site. Everything else is a fallback. Half protected isn’t protected. It’s just a slower way of being caught off guard.
