Are you overwhelmed yet by the insane variety of security cameras in this diverse market? If you're stuck on whether to choose to upgrade or install HD-CVI or HD-TVI, hopefully this post will influence your decision and clear up some confusion.
Firstly, you should try to avoid older technology including HD-SDI as this is quickly becoming outdated and will soon become obsolete. One of the major bonuses with HD-TVI is that it can use the same or existing cabling as traditional analog systems. Therefore, If you already have an analog system set up and want to upgrade, all you have to do is replace the DVR and cameras while leaving the walls and plaster alone - Saving you a lot of mess and hassle. This will only work correctly if your pre existing cabling is in good condition without any deterioration, tight bends, poor connectors etc.
It was also thought that HD-SDI could use your BNC Siamese cabling from an even older system without having to rewire. This is somewhat true but there have been many incidents where the cabling required for SDI had to be absolutely pristine or it will ruin the connectivity and desired use of the system meaning that you'd have to purchase a new cable altogether in the end. RG59 and CAT5's transmission distance is also significantly less for HD-SDI compared to CVI and TVI meaning that interruptions with the video is much more frequent and the distance of the cameras from the DVR had to be closer together to avoid disruption.
HD-CVI was released only just before HD-TVI and is owned, manufactured and distributed by one of the largest and most reputable companies in China; Dahua. Although this is a positive aspect it can also be a negative one as no one else is allowed to touch it, meaning if Dahua goes bust (or starts overcharging), so does HD-CVI. This has been witnessed in past history through Betamax tapes and ultimately did not end well.
HD-TVI was created by Technpoint (a USA company) when they partnered with Hikvision (the market leader for CCTV) and is manufactured by over 100 other companies including Samsung which brings strength, flexibility and reassurance that the technology won't disappear and is constantly innovated upon by many brains as it's open source. Both platforms are relatively new to the market though and both have room to improve, update and advance over time.
HD-CVI is not backwards compatible with analog cameras and neither is it backwards compatible with it's own 1080P to 720P CVI formats. HD-TVI is fully backwards compatible though which means it can use traditional older cameras without any errors or issues as mentioned at the start. It can also support up to 2 IP cameras. If you already have BNC cables running through the walls, a HD upgrade to TVI will suit you perfectly.
Both formats offer exceptional video quality up to 1080P, run smoothly at the same FPS each and both offer relatively the same Coax cable distance (3C/5C) of 300 / 500m. If you're using a CAT5 standard cable HD-TVI will reach around double the distance of CVI. The TVI DVR can mix up the signals of 720P and 1080P allowing you to view both at the same time when CVI can't and they both also offer similar pricing.
Therefore, the winner so far is HD-TVI. Nonetheless, IP cameras are dominant in the overall war as they produce much higher video quality than SDI, CVI and TVI and are easier to install future updates but are much more expensive and can drain a lot of bandwidth, especially with 8CH+ systems. However, you can also wire IP systems similarly to analog ones so that bandwidth isn't drained.
At OverWatch Security we provide HD-TVI, IP & AHD systems from reputable market leaders and have professional Melbourne installers at the ready.
We also have hybrid AHD systems which include HD-CVI capabilities and are backwards compatible, also, they are able to run up to two IP cameras as well as other HD analog's at the same time. These cheaper AHD systems are exclusive to OverWatch Security.
I'll now leave you with a detailed comparison of how the HD Analog formats compare (sourced from hdanalog.com):