chris_0008 0 Posted January 29, 2014 Hi all , what is the meaning of this video output -HD-SDI CVBS(1Vp-p,75ohm)?? link: http://www.cctv-ir-cameras.com/china-hd_sdi_1080p_cctv_ir_cameras_wdr_3d_dnr_with_4_9mm_verifocus_lens-1595456.html Any help is appreciated Share this post Link to post Share on other sites
SunnyKim 2 Posted January 29, 2014 It is not IP Camera, nor the conventional analog camera. It outputs HD 1080 sized video over a good conditioned cable. You can preview live incoming HD sized video. It also outputs conventional analog TV signal (CVBS) as well, which can be used for testing camera or can be used in case HD-SDI transmission has turned out to be so bad. Share this post Link to post Share on other sites
varascope 0 Posted January 29, 2014 CCTV video signal operates 1 volt peak to peak @75 ohms HD-SDI (serial Digital Interface) is a digital signal transmitted over coax. You cannot plug this in any BNC monitor or DVR and see it. CVBS is analog video So what you are seeing in this specification is a camera that has both. Why you ask? HD-SDI test monitors most installers would use are expensive. NSTCCTV sells one that is about $750. Analog test monitors range from $75-500 depending on what features you want. By adding CVBS an installer can use their cheaper test monitor to focus and align. The only issue is by using CVBS is focus maybe only 90-95%. You will also notice by using CVBS monitor to focus a HD-SDI cameraa is the Night images seem out of focus compared to daytime. This is called backfocus. You will see with an HD-SDI test monitor you can get 99-100% focus. The monitor I mentioned earlier from National Security Tech has a neat focus calibration feature for HD-SDI and CVBS that allows you to focus by a meter rather than visual. Align the numbers then look at the picture after and sure enough it is in focus. You can get a HD-SDI field monitor with no added feature for about $500 Share this post Link to post Share on other sites
