Coaxial cable cut in CCTV camera

[mujju_433 0]

Hi ,

 

Can anyone tell me how to identify a suspect when someone is cutting the video cable of a cctv camera?? It is something related to End of Line concept , Please can anyone explain me in more detail , It would be better if he can explains with suitable diagrams

 

 

Thanks

[tomcctv 190]

Can anyone tell me how to identify a suspect when someone is cutting the video cable of a cctv camera??

 

 

do you mean how can you be alerted to a cable being cut ???? most systems will have a function called video loss this will make your dvr beep or if you have email alert it can send you info.

 

 

but if you are talking Can anyone tell me how to identify a suspect when someone is cutting the video cable of a cctv camera then it would be better to hide or protect your cable .. to identify a person cutting the cable ... your camera would need to have the view of the cable in its image to identify

[Soundy 1]

Yeah, I kinda got that the OP just wants to be alerted when a cable is being cut... nearly every DVR on the market will throw up a "video loss" display or something similar, almost all of them will (or can) start beeping when this happens, and many can send an email and/or SMS the instant there's a loss of signal.

[mujju_433 0]

In Dedicated Micros DVRs can you explain how to find out ? As you guys told that there will be a signal loss , thats fine but how do the person knows about it , the camera will be placed somewhere else and the feed which is coming from the camera will be to the DVR , How do they know? Can anyone give us the clear answer on this,

 

One important point which you have discussed is to protect a cable with some material so that no one can cut the cable , but in case if he cuts the cable which is being protected then how to find out ??

 

thanks

[tomcctv 190]

Dedicated Micros DVRs can you explain how to find out

 

yes new DMs have a built in video help menu. are you using a DM ???

 

 

but the result is the same. when cable is cut you will either get VIDEO LOSS or blank screen. and if you have alarms switched on for video loss or fail hard drive. then the DVR will give an audio alarm and this alarm can also be sent via DVR network.

 

One important point which you have discussed is to protect a cable with some material so that no one can cut the cable , but in case if he cuts the cable which is being protected then how to find out

 

 

it will be the CUT cable.

[rory 0]

In Dedicated Micros DVRs can you explain how to find out ? As you guys told that there will be a signal loss , thats fine but how do the person knows about it , the camera will be placed somewhere else and the feed which is coming from the camera will be to the DVR , How do they know? Can anyone give us the clear answer on this,

 

One important point which you have discussed is to protect a cable with some material so that no one can cut the cable , but in case if he cuts the cable which is being protected then how to find out ??

 

thanks

Yeah run the cable in conduit.

 

Otherwise have the Video Loss send an email alert.

[fa chris 0]

End of line concept doesn't really apply to video cameras. Since the cameras are constantly streaming data, the DVR knows something is wrong immediately when the steam stops. Either the camera is broke, the cable was unplugged, or in this case, the cable was cut.

 

End of line involves putting a resistor (or in some cases, a capacitor or a diode) at the end of a cable to supervise it. The head end equipment constantly monitors the cable for whatever resistance is in the end of line resistor, and if a cable is cut (or a normally closed dry contact opens up) that resistance will go to infinity so the head end equipment knows something is wrong. Likewise, if the resistance drops to around zero because of a short in the wire (or a normally open dry contact closes), then the head end system knows something is wrong.

 

This is useful when you want to supervise devices like fire alarm strobes, door position switches, motion detectors, etc. But with devices like CCTV cameras that constantly stream data, or devices like servers which constantly talk back to the head end, it's not needed.

[cctv_down_under 0]

If your going for IP based cams, many now recored at the camera once a cable is cut and many also dual stream

[Birdman Adam 0]

Run the cable in conduit, preferably a metal, aluminum or steel!