EverFocus HD-CCTV EPHD08 - Manual (Page 16)

8
2 Installation
2.1 HD-CCTV wiring for video inputs
2.1.1 Understanding HD-CCTV signals and wiring
Even if EverFocus HD-CCTV equipment uses coaxial cable and BNC type plugs similar to standard CCTV
technology - the requirements for wiring and cable types are some different.
This chapter explains some basic facts for HD-CCTV signals and cable requirements.
2.1.2 HD-CCTV signal
In result to the high resolution and uncompressed image transmission from the camera high frequencies
are used for HD-CCTV signal transmission.
EverFocus HD-CCTV technology is mostly based on the SMPTE-292M standard, which defines HD-SDI
(High Definition - Serial Digital Interface) video transmission.
In classic CCTV video standards PAL/NTSC the frequency bandwidth is < 6MHz for high resolution
cameras.
HD-CCTV works with up to 1.5 GHz, so this technology requires ~ 250 times higher frequency than
PAL/NTSC based CCTV.
The figure below shows the basic timing and signal levels of a full HD (1920x1080) signal:
Timing of HD-SDI signal ("Eye"-diagram)
The diagram shows the total difference of HD-CCTV signals to classic NTSC or PAL signals.