Bridging Wires
Posted: Wed Jun 29, 2016 12:58 am
Alright, there's a topic for alarm aficionados to answer.
I'll give you this example. Make note that I have legitimate access to the inside of the compound at certain times, and at certain times not.
We have this sticky situation. A fine quality window sensor connected to a wire that runs through the building and connects itself to other sensors.
Would it be possibly to simply do this?
The system I'm looking at is actually mounted directly on the glass, so I'm assuming it's a proper shock-based glassbreak sensor, and at the very least, a hybrid acoustic/vibration sensor that will sense any attempts to break the frame of the window itself. I doubt that something that close to the glass is an acoustic sensor.
I've got not clue about the brand of the sensor, so - is it common for modern sensors to detect changes in voltage? Say V = IR, where I is current and R is resistance, and I bridge the connection with a wire of a slightly different resistance. This can happen due to it being of a different thickness than the original wire, is the sensor likely to sound the alarm?
Oh, and cutting the sensor itself - perhaps when cut from the power supply, and assuming the best of it, the sensor will have an internal power supply of it's own (backup battery) that will either send out an alarm to the central control unit or sound an audio alarm. How would I go about avoiding this?
The only ideas popping into my head at the moment are:
1. Covering the sensor in foil, hoping any signal it sends out doesn't get out. Not likely as it would get detected from inside rather quick.
2. Muffling the sound of the backup alarm with foam or something akin.
Oh, and if the system is really damn advanced, each window sensor sends out pings to the central control unit at regular intervals for checks. When, for example, unit #X fails to do so, an alarm is sounded and the responsible security firm investigates - no police - as an alarm failure does not necessarily mean break-in attempt.
Anyone here with more knowledge on bridging wires?
I'll give you this example. Make note that I have legitimate access to the inside of the compound at certain times, and at certain times not.
We have this sticky situation. A fine quality window sensor connected to a wire that runs through the building and connects itself to other sensors.
Would it be possibly to simply do this?
The system I'm looking at is actually mounted directly on the glass, so I'm assuming it's a proper shock-based glassbreak sensor, and at the very least, a hybrid acoustic/vibration sensor that will sense any attempts to break the frame of the window itself. I doubt that something that close to the glass is an acoustic sensor.
I've got not clue about the brand of the sensor, so - is it common for modern sensors to detect changes in voltage? Say V = IR, where I is current and R is resistance, and I bridge the connection with a wire of a slightly different resistance. This can happen due to it being of a different thickness than the original wire, is the sensor likely to sound the alarm?
Oh, and cutting the sensor itself - perhaps when cut from the power supply, and assuming the best of it, the sensor will have an internal power supply of it's own (backup battery) that will either send out an alarm to the central control unit or sound an audio alarm. How would I go about avoiding this?
The only ideas popping into my head at the moment are:
1. Covering the sensor in foil, hoping any signal it sends out doesn't get out. Not likely as it would get detected from inside rather quick.
2. Muffling the sound of the backup alarm with foam or something akin.
Oh, and if the system is really damn advanced, each window sensor sends out pings to the central control unit at regular intervals for checks. When, for example, unit #X fails to do so, an alarm is sounded and the responsible security firm investigates - no police - as an alarm failure does not necessarily mean break-in attempt.
Anyone here with more knowledge on bridging wires?