Features
One X Multiple: multiple 4K video over one coax, simultaneously.
With H.264 compression, the data rate is around 3~4Mb/s for 1080P HD video, and around 8Mb/s for 4K video. With H.265 compression the data rate is even less. The data rate of a ccHDTV channel can be up to 31.67 Mb/s, which is far more than enough for 4K video. Setting the modulated signal at different channel (center frequency), one can combine the signals from different cameras with a simple TV combiner (splitter), so that only one coaxial cable is required.
OFDM: advanced OFDM technology for delivering digital video.
Similar to IP surveillance system, DTV surveillance system uses digital modulation. However, DTV is more flexible in the choice of transmission media, including coaxial cables, Ethernet cables, twisted pair, optical fiber and even air (wireless). DTV adopts COFDM (Coded Orthogonal Frequency Divisional Multiplexing), which is the most popular modulation technique today. COFDM is very robust to environment effect such as interference and noise encountered during transmission.
Long distance: no repeater required over 1KM.
DTV is well immune to noise and interference. With careful design and proper cables such as RG6, the transmission can be slightly over 1km without repeaters. In comparison, IP surveillance system requires an industrial-grade router every 100~300m. DTV’s single-segment transmission distance is more than three times longer than IP’s. It is no doubt that DTV is the best solution for wide-area surveillance system.
Flexible integration: upgrade without cable change. Flexible topology.
Because of the advanced digital modulation technique, DTV products have more margin for cable quality degradation. For most locations where cctv is still in operation and upgrade to HD or UHD is needed, DTV provides a no-recabling solution, in which one only needs to replace the cameras and DVRs. There is no need for re-cabling, unless the existing cables are completely damaged. DTV not only solves cctv’s common problems, such as color change, blurry and snowy video, and so on, but also upgrades the system from SD pictures to HD or UHD pictures.
Easy integration: easy integration into IP network. Power over coax(POC) available.
Because IP and DTV are both digital systems, it is possible to use both systems together, taking advantage of each system. Since IP has been in the market for many years, the access control, alarm, and automatic production control developed for IP surveillance system can be easily migrated to DTV surveillance systems. DTV providers are dedicating their effort to fulfill such requirements from their customers. In addition, because DTV uses high frequency transmission, the baseband (DC) can be used for supplying DC power to the cameras. This solution is called Power over Cable (PoC) and is particularly suitable for locations where power is not easily accessible.