Specifications

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HD-CCTV SYSTEM
01
HD class video quality as the biggest issue in the CCTV market
Recently the biggest issue in CCTV market can be said to be the high resolution application of HD or Megapixel class more
than anything else. Not simply enhancing the camera’s video quality, but the change of resolution from the existing SD(720x-
480:NTSC) class to HD(1920x1080:HD1080p) class requires a change in the whole system. In the HDTV era, high denition and
high visibility were required in the market, but the SD class(NTSC/PAL) image was not enough to meet the requirement due to
its limitation in resolution. The market requirement for high denition started to be applied to the CCTV market in a Megapixel
IP camera type along with the development of a HD class image sensor at a reasonable price, and recently HD-SDI transmis-
sion technology was grafted on the CCTV market, starting to be introduced as a product group of HD-CCTV.
HD-SDI transmission method used in HD-CCTV system
HD-SDI is a standard specication to transmit video between HD class broadcasting systems. HD-SDI is the abbreviation of
High Denition Serial Digital Interface, which means the method to convert video signal into serial video data and transmit
it through a coaxial cable without compressing it. HD-SDI was standardized by SMPTE, which describes all the contents of
electric interfaces, data formats, auxiliary data and video formats. The feature of HD-SDI transmission method is that because it
transmits video as digital signal, it does not make degradation of video quality within a distance where data are not lost. It can
transmit audio and control signals as well as images, and it seems that it will be able to supply power in the future.
The HD-SDI transmission method is basically dierent from SD class transmission method. As shown in the table below. Al-
though they use the same coaxial cable, but there is big dierence that SD class video is using the analog transmission method
and HD-SDI is using the digital transmission method. In addition, the HD-SDI transmission method is one of the SDI transmis-
sion methods, which can transmit video up to 1080p30. This is dened in SMPTE 292M, which uses 1.485 Gb/s transmission
data quantity and 750MHz transmission frequency.
HD-CCTV, HDcctv, HD-SDI terminology
HD-SDI : Technology to transmit HD video digitally through a coaxial cable without compression
HD-CCTV : HD class video CCTV system realized by using HD-SDI transmission method
HDcctv : HD-CCTV assured its specications and performance by HDcctv Alliance
Introduction of HD-SDI transmission technology
In order to adopt HD class video into CCTV system, HD-SDI transmission technology and dedicated chip solutions were in-
troduced in the security market. Because HD-SDI is easy to understand and easy to use, it provided easy way to build the HD
surveillance system. Moreover, because this technology was already veried in the broadcasting market, it can be said that
HD-SDI surveillance systems already have the reliability.
HD-CCTV as a HD system?
In here, we want to dene a CCTV to transmit the SD class
video through a coaxial cable as the SD-CCTV, and a CCTV
to transmit the HD class video through a coaxial cable us-
ing HD-SDI transmission method as the HD-CCTV. This is
because the HD-SDI transmission method was developed as
the most suitable transmission method to transmit the HD
class video without degradation of video quality, being used
as the standard transmission method between broadcast-
ing systems for HDTV system. Now, the high denition vid-
eo security market is expected to develop into a new shape
through competition and fusion between the HD-CCTV mar-
ket and the IP market.
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HD-SDI : A technology to transmit HD video digitally through a coaxial cable without compressing it.
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