1. Study of Optical Interface for CCTV Camera
Sang-Bong Byun1, Young-Hyung Kim2, Yong-Hwan Lee1
1 School of Electronic Engineering, Kumoh National Institude of Technology, Yangho-dong,
Gumi, Korea
2 Industry-Academic Cooperation Foundation, Kumoh National Institude of Technology,
Yangho-dong, Gumi, Korea
{sb5816, kic126, yhlee
Abstract. Use of high-definition CCTV is increasing. The copper wire is hard to use for transmitting data to a long-distance point with no data loss. However, when the high-definition video data of CCTV are transmitted by using the optical interfaces which are based on HDMI, long-distance transmission of data is possible. Using the optical interface for transferring video data, the transmission distance is increased, the loss of data is reduced, and the transfer speed becomes faster. In this paper, we study the optical interface for transferring video data for high-definition CCTV.
Keywords: CCTV, Optical interface, HDMI, High-Definition
1 Introduction
Nowadays video data in the area of consumer electronics is dominantly displayed on high-definition display. One common standard to transmit the uncompressed signal from the video source to the video sink is the HDMI(High-Definition Multimedia Interface)[1] that carries the data over four transition-minimized differential signal (TMDS)[2] lines at a maximum bit rate of currently 3.4 Gb/s per channel. Together with an advanced signal recovery at the sink the video can hence be transported over a few meters[3].
CCTV has been used in various fields recently. On the main streets and most buildings, CCTV is installed. The number of the installed CCTV has been increased year by year. As the installation of CCTV increases, the distance of the CCTV control room is far away. When the low resolution CCTV is used, the efficiency of monitoring is low. It is possible to use the HDMI when sending a video data of CCTV, to transfer the high quality video data. However, the transmission using the HDMI is capable of transmitting several tens of meters. When transmitted through the optical interface video data of CCTV, it is possible to send data within several kilometers.
In this paper we study the optical interface for long-distance transmission of high definition video data of the CCTV. In order to transfer the HDMI video data through the optical interface, a serialization is required.
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2. Flexibility of bending
Proceedings, The 3rd International Conference on Circuits, Control, Communication, Electricity, Electronics, Energy, System, Signal and Simulation
2 Optical Interface
Using the optical interface, long distance transmission of video data is possible. On the other hand, the use of copper cable, for a variety of reasons, long-distance transmission of high definition video data is impossible. Table 1 shows the difference between copper and optical cables.
Table 1. Difference between copper and optical cables.
Technical elements
Fiber-optic cable
Copper cable
Transmission length
> Several tens of Km
< 10 m
Price
High
Low
Data loss
Transmission speed
Reliability
High, Stable
Flexibility of bending
Electrical isolation
Yes No
EMI free
Be light-weighted
Enable
Difficult
Figure 1 shows a block diagram of a CCT video data transfer using the optical interface.
Fig. 1. Block diagram of a CCT video data transfer using the optical interface.
Convert electric signal to optical signal in the EOC(Electronic-Optical Converter). Convert optical signal to electrical signal in the OEC(Optical -Electronic Converter). 67

3. 3 Conclusion References
Study of Optical Interface for CCTV Camera
3 Conclusion
The use of high-definition video is increasing in various fields. CCTV is also switching to the high definition. However, long-distance transmission of high- definition video data is difficult with the copper wire. When transferring data through optical interface, long-distance transmission is possible without loss.
Acknowledgment. This work was supported by the Gyeongbuk Science & Technology Promotion Center(GBSP) grant funded by the Korea government(MEST).GBSP
References
HDMI(High-Definition Multimedia Interface) Specification Version 1.3,
DVI(Digital Visual Interface) Specification Version 1.0,
Nishigaki, M., Uemura, H., Furuyama, H., Sugizaki, Y., Shibata, H., Koike, Y.: Ultracompact 4x3.4 Gbps optoelectronic package for an active optical HDMI cable. In: CPMT Symposium Japan, nd IEEE, pp IEEE Press, Kyoto, Japan (2012) 68