Frequently Asked Questions

Here we cover some of the questions that are frequently asked to the Dublin CCTV Installations team. Click on the questions below to see the appropriate answer.

Why do you need CCTV?

CCTV is a very powerful tool in the fight against crime. Not only does CCTV provide a fantastic visual deterrent – footage can be used to provide evidence against anti-social behaviour, theft, vandalism and burglary – saving you thousands in the long run.

  • CCTV helps to deter thieves
  • View remote locations, including multiple locations at once
  • Safely monitor premises from a control room
  • Provide CCTV evidence to Police to secure a prosecution.

What is analogue CCTV?

Cameras on an modern analogue CCTV system send their video in the traditional base band format over coax or UTP(unshielded twisted pair ex. cat5e) cabling back to a digital video recorder (DVR). Here, video is digitized and stored on hard drives.

Most modern DVRs are a network device, and as such can be accessed remotely from the LAN, or with the proper configuration, from across a WAN or the internet. There are no tapes to change.

Video is kept on hard drives, typically on a FIFO basis so there is always a rolling video archive of the past X days. So, despite the fact that video is being transmitted from the cameras in an analogue format, live and recorded video is still available over the network.

What is IP CCTV?

IP cameras are cameras that record from 1MP up to 10MP and beyond. To give you an idea of the level of detail they can capture a full HD tv displays 2MP. Whereas a high end analogue camera displays resolutions of around 0.4MP. IP video cameras broadcast their video as a digital stream over an IP network.

Like an analogue system, video is recorded on hard drives, but since the video is an IP stream straight from the camera, there is more flexibility as to how and where that video is recorded.

The DVR is replaced with an NVR (network video recorder), which in some cases is just software since it doesn't need to convert analogue to digital. Video footage can then be stored on new or existing network RAID drives as directed by the NVR software.

What is a Hybrid System?

Hybrid CCTV systems combine IP and analogue video, and can be a great way to transition an analogue system to IP without needing to replace all of the existing cameras. Many NVR boxes on the market today are actually Hybrids in that they accept analogue cameras, and IP cameras and combine them onto a single platform for the user.

What is a Turbo/AHD camera?

A Turbo/AHD camera is a camera which is capable of HD quality transmission over traditional coax cable. This new technology fills a void for customers who want to upgrade their systems from analogue without changing their cabling which is one of the biggest costs.

How does HD-over-Coax integrate with my existing analogue equipment?

HD-over-Coax runs on the same coax cable that your existing analogue systems run on. So upgrading to HD-over-Coax is as easy as replacing your analogue cameras with HD-over-Coax cameras and replacing the analogue DVR with an HD-over-Coax DVR. No special configuration is required.

In many cases you may decide to leave parts of your analogue system in place and only upgrade some of your analogue cameras to HD-over-Coax, or just add some new HD-over-Coax cameras. In that case you would replace / add new HD-over-Coax cameras, and add an HD-over-Coax DVR next to your analogue DVR.

What is HD-over-Coax exactly?

HD-over-Coax (High Definition Composite Video Interface) is an over-coaxial-cable analogue HD video transmission standard developed specifically for the CCTV industry. HD-over-Coax composites video, audio, and data control signals together and then transmits them over one coaxial cable, simplifying installation. Using RG-59 cable, HD-over-Coax transmits HD video over distances in excess of 500m (1640 ft.) with no expensive repeaters or signal boosters.

The HD-over-Coax solution incorporates both cameras and DVRs. The technology currently offers two specifications: 1080p (1920 x 1080) and 720p (1280 x 720). In addition, the technology features Auto Signal Compensation (ASC) which provides extremely low signal distortion for long-distance transmission.

What cameras and DVR/NVR’s do you install?

We generally install Hikvision or Geovision products. This is due to their quality, reliability and excellent functionality for the end user. Of course, if you have a specific brand or system in mind we can certainly install it for you.

How long does it take to install a CCTV system?

The first step is for an installer to call to your home or business and make a plan of the property including camera positions, lighting etc. Once you are happy with the proposal we can go ahead and do the installation. This process usually takes about an hour. The installation itself can take between 1 day and 1 ½ days depending on difficulty of running the cables.

What is a Day and Night Camera?

Day and night cameras are cameras that are able to provide video surveillance even at low levels of illumination. A day and night camera displays a full colour image during the daytime but produces monochrome (Black and white) video images at times when the lighting is poor.

The camera has a device that is sensitive to the surrounding light conditions and switches the camera between colour and black & white modes automatically. It is designed to increase its light sensitivity in poor lighting conditions and at the same time reduce noise level in the images. However, the day and night camera will fail if the illumination (Lux) level is too low.

What is an IR camera?

IR is the abbreviation for Infrared. IR cameras have image sensors that are designed to sense and process infrared light emitted from IR LEDs. Similar to Day & Night cameras, IR cameras turned to monochrome mode when illumination falls below a certain Lux. An IR camera differs from a Day & Night camera in which an IR camera is able to capture video images in absolute darkness with the help of infrared light source.

How many days/weeks of recording can I store?

This depends on the size of your hard drive, the number of cameras, which recording mode (on motion, on alarm, continuously, etc.), what type of video compression you are using, quality of resolution used. Please contact our technical support directly for assistance on the calculation.

What is a Wireless Security Camera?

Most security cameras require two pairs of wires: one pair (positive and negative) for power, and one pair to transmit the captured video to a display or recording device (TV or DVR, for example).

Wireless cameras only require one pair of wires - for power. The video is transmitted wirelessly via transmitter and receiver devices. A wireless camera is really a combination of the camera plus a built-in wireless transmitter to send the video, and a receiver to receive the video, which in turn plugs into the monitor or recorder.

Don’t forget power is always required for the camera. Wired systems are definitely more robust and reliable.

What is a PTZ camera?

PTZ stands for Pan Tilt Zoom. PTZ cameras can be instructed to pan back and forth, tilt up or down, or zoom in or out. The cameras are controlled locally with a joystick, or remotely via the internet or smart phone application.

What are the data protection issues with CCTV?

For information on the issues regarding CCTV data protection click here.

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For a free quotation please click on the link below.complete the form to the right of this page. Alternatively if you would like a friendly chat to discuss your individual CCTV needs you can call us on 00353 862 698 129 or email info@dublincctvinstallations.ie.

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