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| Twisted pair video transmission in the video monitoring
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Throughout the monitoring system, the video
image transmission is a very important aspect. Signal used to transmit
images of the main medium of coaxial cable, fiber optic and twisted pair.
Because of its coaxial cable, when the video signal in the coaxial cable
transmission by the decay and its transmission distance and the frequency of
the signal itself. Video signals in the coaxial cable transmission signal
not only by the overall rate of decay, and decay of the frequency components
vary greatly, particularly the color of the greatest attenuation, the only
suitable for coaxial cable transmission distance of 200 meters around video.
Fiber is to address long-distance transmission of video signals and use.
Optical fiber transmission system as a whole because the price is too high,
the laying of fiber connecting the need for specialized equipment,
installation and commissioning difficulties, difficult to find fault,
difficult to repair damage and other shortcomings, the 3,000 meters within
close range video transmission, fiber is not a very good choose.
To seek an economic, high-quality transmission, transmission distance from
the solution is very necessary. Changzhou China , Peng Ling
Electronics Co., Ltd. under such circumstances, foreign countries in recent
years with the audio and video data transmission to the development trend of
development of a twisted pair audio and video data transmission equipment,
can be twisted pair transmission system for monitoring, it is Good solution
to the above problems in the future monitoring system will be widely used.
In many industrial control systems and interference in larger places are
used in the transmission of the twisted pair, such as the use of telephone
transmission is twisted pair, today we are also widely used in local area
networks use twisted pair. The reason why such extensive use of twisted
pair, because of its strong anti-interference capability, transmission
distance, cabling easy, inexpensive, and many other advantages. Because of
the twisted pair also exist in the larger signal attenuation, transmission
distance, the frequency signal can not be too high, and high-speed signals
such as Ethernet is only limited to within 100 m. For video signals, the
bandwidth to 6 MHz, if directly in the twisted pair of transmission, will
decay great, twisted pair on the video signal in order to achieve
long-distance transmission, and compensation must be enlarged, twisted pair
transmission equipment This function is completed. With a twisted pair
transceivers equipment, can transmit images to 1-2 km, if the use of
metadata, can also multiplied transmission distance, and transfer the image
quality comparable with video optical transmitter and receiver (such as As
close twisted pair / audio transmission equipment weighted SNR ¡Ý 60 dB,
differential gain ¡Ü 2%, differential phase ¡Ü 2 ¡ã). Twisted-pair and
twisted-pair transmission equipment prices are very cheap, not only did not
increase system costs, but from the increased cost of its coaxial cable and
down a lot. Therefore, the monitoring system for the use of twisted pair
transmission has obvious advantages:
1. Transmission distance, high-quality transmission. As the twisted pair
transceivers used in the treatment of advanced technology, excellent
compensation of the twisted pair of video signals and the rate of decay
between the different frequency attenuation poor, to maintain the original
image brightness and color as well as real-time, In the transmission
distance to 1 km or longer, the basic image signal without distortion. If
the relay, transmission distance will be farther away.
2. Wiring convenient, high utilization of cable. One pair of ordinary
telephone lines can be used to transmit video signals. Extensive laying of
the building housing the five types of non-admission of the unshielded
twisted pair in a way you can send video signals, without wiring; even
re-wiring, cables than five types of coaxial cable and fiber easier. A
Category 5 cable has four pairs of twisted pair, if you use a video signal
transmission lines, and several of the line can also be used to transmit
audio signals, control signals, power supply or other signal; if all used to
send Video, can send four-way video to enhance the utilization of cable,
while avoiding a variety of separate signal routing the trouble to reduce
the construction cost.
3. Strong anti-interference capability. Twisted pair can effectively curb
the common mode interference, even in strong interference environment,
twisted pair also transmits an excellent image signals. Moreover, the use of
a rope in a few of the twisted pair were sent different signals, there will
be no interference with each other.
4. * Can be high, easy to use. Twisted pair transmission equipment with
anti-lightning, according to industrial design, is simple to use, no
expertise, nor too much of the operation, once installed, long-term
stability.
5. Cheap, convenient material. As the use of the current widespread use of
the five general categories of non-shielded cable or ordinary telephone
lines, easy to buy, but prices are cheap, to the works of great convenience.
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