Evening all,
I'm after some advice with regards some issues I'm having at work with a new CCTV system that has been installed at one of our sites, a project that I have been overseeing.
A bit of history, the site has recently been refurbished as part of which the CCTV system was updated/replaced. The old system was a very elderly analogue system consisting of 6 external pole mounted cameras (2 x PTZ dome & 4 x fixed cameras) and one internal fixed camera. Each external pole has a direct buried armoured RG59 cable back to the the NVR and the internal has standard RG59 run internally back to the NVR. The longest external run is approx. 250 metres, there were no issues with the old system except the image quality was poor due to the age of the equipment.
The requirement for the new system was to increase the coverage to 2 x fixed cameras per external pole (12 total) and one internal camera in the same position. A local CCTV firm who we have used previously and have a good reputation quoted me a solution that would use a multiplexer at each column to send two cameras down the one RG59 cable. Ideally we would have replaced all of the cabling but the budget simply wouldn't stretch to this as it would involve a significant amount of civil work.
Following the installation of the new system we have had issues with the external cameras, if we connect a single camera at each column direct to the cable we get a perfect and stable HD picture. As soon as we introduce the multiplexers this is where the problems begin, typically we get one camera working with a stable HD image but the second either doesn't work at all, we do get an image but its awful quality or we get an unstable poor quality and intermittent image.
I spent a day on site with the company today and we have tried various things, they believe we simply can't get two HD images down the one RG59 due to the age of the cabling. However they ran a new temporary cable from the NVR to the nearest column to prove this and we had the same issues, if we connected the multiplexer at the bottom of the column and tested the output with a test monitor we had a perfect image on both channels. I believe the multiplexers they have supplied just aren't up to the job, I have attached some pictures of the multiplexers being used and an example of one good image we are getting and one bad.
I'd really appreciate any advice, specifically do any of you have any experience with these particular multiplexers good or bad and can you suggest a reliable alternative we could purchase to test? I very much believe these are the issue especially after the testing we carried out today.
Please let me know if you require any further information, the NVR and cameras are HIKVISION, I can find out the model numbers if needed.
Thanks in advance.
Dan
I'm after some advice with regards some issues I'm having at work with a new CCTV system that has been installed at one of our sites, a project that I have been overseeing.
A bit of history, the site has recently been refurbished as part of which the CCTV system was updated/replaced. The old system was a very elderly analogue system consisting of 6 external pole mounted cameras (2 x PTZ dome & 4 x fixed cameras) and one internal fixed camera. Each external pole has a direct buried armoured RG59 cable back to the the NVR and the internal has standard RG59 run internally back to the NVR. The longest external run is approx. 250 metres, there were no issues with the old system except the image quality was poor due to the age of the equipment.
The requirement for the new system was to increase the coverage to 2 x fixed cameras per external pole (12 total) and one internal camera in the same position. A local CCTV firm who we have used previously and have a good reputation quoted me a solution that would use a multiplexer at each column to send two cameras down the one RG59 cable. Ideally we would have replaced all of the cabling but the budget simply wouldn't stretch to this as it would involve a significant amount of civil work.
Following the installation of the new system we have had issues with the external cameras, if we connect a single camera at each column direct to the cable we get a perfect and stable HD picture. As soon as we introduce the multiplexers this is where the problems begin, typically we get one camera working with a stable HD image but the second either doesn't work at all, we do get an image but its awful quality or we get an unstable poor quality and intermittent image.
I spent a day on site with the company today and we have tried various things, they believe we simply can't get two HD images down the one RG59 due to the age of the cabling. However they ran a new temporary cable from the NVR to the nearest column to prove this and we had the same issues, if we connected the multiplexer at the bottom of the column and tested the output with a test monitor we had a perfect image on both channels. I believe the multiplexers they have supplied just aren't up to the job, I have attached some pictures of the multiplexers being used and an example of one good image we are getting and one bad.
I'd really appreciate any advice, specifically do any of you have any experience with these particular multiplexers good or bad and can you suggest a reliable alternative we could purchase to test? I very much believe these are the issue especially after the testing we carried out today.
Please let me know if you require any further information, the NVR and cameras are HIKVISION, I can find out the model numbers if needed.
Thanks in advance.
Dan