HD-TVI or IP - CCTV - Which to Choose?
Most end users aren't interested in the specifics of a CCTV system, they simply want to be able to view and record certain areas. Frame rates, quality, compression and recording capacity generally aren't of interest. Just the price. Here is a simple explanation between the 2 systems types we offer, HD-TVI and full IP.
HD-TVI stands for High Definition Transport Video Interface. Depending on the camera model, HD-TVI can provide 2 - 8 MP images. Our standard entry level domestic system utilises 5MP cameras with a resolution of 2592 x 1944 pixels. HD-TVI is an analogue system, however the DVR is still connected to the internet, meaning images can still be viewed remotely on your smart phone. HD-TVI offers the same image quality as IP with significant cost savings. The biggest benefit of TVI is that you can upgrade your legacy analogue technology cameras with cameras that are comparatively inexpensive whilst saving even more money by not having to re-run expensive cables. TVI DVR’s (Digital Video Recorders) accept old analogue cameras as well as the new TVI cameras, and most even accept a small quota of IP cameras. This means that you can upgrade your DVR and a select few cameras to High Definition ones, incorporate the existing legacy analogue cameras and only replace them when they start to fail or your budget allows.
IP Cameras simply work in a different way than TVI but ultimately provide the same result. IP cameras can have much higher megapixel capabilities than TVI but this would only be necessary if you are looking to cover a very large area with a single camera, such as a live street scene, large car park, busy concourse etc, where being able to zoom in on features is of paramount importance. A great benefit of IP is that cameras can be “PoE” – Power over Ethernet. This means that the CAT5 cable that runs from the camera to the NVR (Network Video Recorder) carrying the video picture can also carry the power (normal network distances of 90m generally apply). Cameras are often powered directly from the NVR itself (on systems up to 16 cameras) and where that isn’t possible, from PoE network switches.
So What Should I Go For?
For most domestic properties with static fixed cameras, we would recommend a HD-TVI system. A Whether this is with a TVI camera or an IP camera will usually come down to whether there is existing cabling, the requirements of the site, the types of cameras required and the budget of the client. Where IP comes into its own is in the commercial market, where different cameras and lenses can be utilised for different areas. For example we often install PTZ remote control cameras externally to commercial properties, although you can get these in HD-TVI style, the added felxibility of installation with IP means we're more likely to recommend a full IP system for this customer. With IP there is no limitations to the number of cameras where as with HD-TVI we wouldn't recommend this for systems over 16 cameras. Where the site has satellite buildings which all require cameras. A CAT6 cable can be run from the Comms room or security office to each satellite building in a hub formation where it connects to a network switch, and all the cameras from that building run back to that local switch. With TVI, all cameras would require individual cabling back to the central DVR. #HDTVI #IPCamera #cctv