Broadband cable "principle of a line"

Broadband cable "principle of a line"
Broadband cable line should be understood as multi system, multi signal integrated a coaxial

cable transmission "first pass" two-way transmission platform, broadband cable"
The first pass "TV monitor system can be defined as a multi monitor image, audio and control

signals for integrated transmission, alarm, broadcast signals
Transmission space "link" multifunction broadband cable bidirectional transmission system.
What is the broadband cable line, what is the working principle and composition?
Answer: the so-called broadband is compared with the traditional monitoring using video baseband

transmission, coaxial visual control cable bandwidth for 0~1000MHz, but the traditional

monitoring signal only occupies one of the 0~6MHz, the bandwidth utilization rate of less than

1%. Broadband refers to the full use of the space resources of the coaxial cable, multi video and

audio and control signals to different carrier. Cable is modulated to the audio and video and

control signal of different carrier integrated into the "a" two-way transmission of coaxial

cable. So
Broadband cable "first pass" should be understood as multi system, multi signal integrated a

coaxial cable transmission "first pass" two-way transmission platform, broadband cable"
The first pass "TV monitor system can be defined as a multi monitor image, audio and control

signals for integrated transmission, alarm, broadcast signals
Transmission space "link" multifunction broadband cable bidirectional transmission system.
Broadband cable monitoring system is mainly composed of camera + + integrated multiplex + data

controller and coaxial cable, its working principle is: through
Synthesizer image signal is modulated to the high frequency carrier, the multi signal uplink

transmission in a coaxial cable, transmitted to the main control room after single or multiple

video
Integrated the demodulated video signal; control signals to the front lens, camera and data

carrier modulation by the data controller, modulation to the RF carrier
Through the coaxial cable transmission, after comprehensive device to control signal demodulation

for RS485 control mode is output to the decoder, so as to control the cloud mirror
. This means a multi-channel monitoring signal "first pass", the technology is mature, stable and

reliable transmission, develops a new method, greatly simplifying the
Wiring structure, reducing the cost of.
Note: because each television signal (Video + Audio) occupy the bandwidth of 8MHz, the theory of

space cable resource coaxial transmission 120 multichannel TV signal,
But according to our country television signal frequency standard (PAL-D/K), and price factors,

1-20 signal to achieve control bus using coaxial cable transmission
Transmission is economical and practical. How to do several points above the monitoring project

will monitor images, audio, control and alarm signal is organic and unified, integrated into the

"a" coaxial cable, bidirectional transmission?
Answer: with the application development and the requirement of monitoring monitoring integrated

to improve, a few kilometers to tens of kilometers monitoring signal transmission will toward"
Broadband integrated, simple wiring, two-way transmission, remote immunity "direction, finally

realize the monitoring signal broadband multichannel bidirectional synchronous transmission,
The multi system, multi signal integrated cable line. From the current monitoring transmission

technology, not only to achieve monitoring image, audio, control and alarm signal
"First pass", but also to ensure the quality of image transmission, to achieve high performance

price ratio, economical and practical, the only broadband transmission mode when the. Because of
As the transmission medium for RF coaxial cable, RF coaxial cable bandwidth is 1000MHz, using

frequency division multiplexing, frequency modulation, mature and stable CATV technology, can

make the multi signal in which separately without mutual interference, broadband cable

bidirectional synchronous transmission, and the signal transmission without delay, has the very

strong video interference ability.
"How the stability line through" TV monitoring system installation and debugging complex??
Answer: the system is based on cable television frequency stable job multiplexing technology,

cable TV in China has two, thirty years
History, very stable and reliable. The working frequency of 48.5-550MHz, is a cable television

transmission reverse application, uplink transmission image and sound signal
Number, transmission control data downlink. The system is simple to install, debug only needs to

meet to demodulation end monitoring point level can be.