EverFocus EPHD08 User Manual download pdf (Page 16)

2 Installation

2.1 HD-CCTV wiring for video inputs

2.1.1 Understanding HD-CCTV signals and wiring

Even if EverFocus HD-CCT

V 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-CCT

V 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.

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EverFocus EPHD08 User Manual Page 16