Wireless monitoring of cable monitoring VS

in the field of video surveillance, monitoring video transmission mode mainly divided into two kinds, one kind is based on the coaxial cable or network cable transmission, another is based on 3 g / 4 g and wifi wireless transmission.

monitoring of transmission cable way

1, the video baseband transmission: the most traditional way of television monitoring transmission, of 0 ~ 6 MHZ video baseband signal does not make any processing, through a coaxial cable ( Non-equilibrium) Direct transmission analog signals.

advantages: short distance transmission loss of the image signal is small, low cost, stable system.

weakness: the transmission distance is short, more than 300 metres high frequency attenuation is larger, there is no guarantee that the image quality. Large amount of wiring and maintenance difficulties, poor scalability, suitable for small systems.

2, optical fiber transmission: common are analog optical transceiver and digital optical transceiver, is to resolve dozens or even hundreds of kilometers of television monitoring transmission optimal solution, through the video and the control signal is converted into a laser signal transmission in optical fiber.

advantages: long transmission distance, small attenuation, anti-interference performance is the best, suitable for long distance transmission. The standard optical transceiver is 0 - - Transmission distance, 20 kilometers, 8 road optical transceiver, the most valuable, this has something to do with bald, do friends all know that optical transceiver. Optical transceiver now price is very cheap, but good quality is very expensive.

disadvantages: for monitoring signal transmission within a few kilometers is not enough; Light welding and maintenance should be professional and technical personnel and equipment operation, maintenance of high technical requirements, not easy expansion. Some engineers in order to save the cheapest light jumper and flange, tail fiber meet equipment directly, after the repair when you know that how important it is to jump thread and flange.

3, network transmission: solve the metropolitan area between remote transmission, the extremely scattered monitoring of point, adopt MPEG2/4, H. 264 audio and video transmission control signal compression format.

advantages: the network video server upload as monitoring signal equipment, have the Internet installed on the remote monitoring software can monitor and control.

disadvantages: limited by the network bandwidth and speed, can only transmit small images, low quality of the image; Transmit only several to dozens of frames per second, animation effects obviously and has a time delay, unable to achieve the real-time monitoring. But I am very bullish on network transmission.

4, twisted pair transmission ( Balance transfer) : is a kind of video baseband transmission and converts 75 Ω non-equilibrium model to balance mode to transmit. Is to address the monitoring image transmission within 1 km, one of the solutions of complex electromagnetic environment occasions, will monitor image signal processing transfer by way of symmetrical balance.

advantage is: the wiring simple, low cost, not the common mode of resistance is strong.

disadvantages: can only be solved within 1 km to monitor image transmission, and a twisted pair can only transmit image all the way, are not suitable for application in large and medium-sized monitoring; Twisted-pair texture fragile anti-aging ability is poor, not suitable for field transmission; Twisted-pair cable attenuation of high frequency component is bigger, the image color will be affected by a lot of damage.

5, a total of cable transmission, video using amplitude modulation, FSK modulation techniques such as data, dozens of road monitoring images, audio, control and alarm signals are integrated into the 'a' in the coaxial cable of the two-way transmission. Namely go backwards, cable TV network is completely closed circuit television transmission technology, very mature, very practical.

advantage: make full use of the resources of the coaxial cable of the space, 20 audio and video and control signals in the same cable two-way transmission, to achieve 'one line'; Simple construction, convenient maintenance, a large number of save the cost of materials and construction cost; Frequency division multiplexing technology to solve the distance transmission point spread, wiring difficult monitoring transmission problem; Radio frequency transmission mode only attenuation carrier signal, image signal attenuation is very small, luminance and chrominance transmission synchronization nested, ensure that image quality reach the national standard 4 class above; Using 75 Ω coaxial non-equilibrium transport has the very strong anti-jamming capability, electromagnetic environment complex situations still can guarantee the quality of the image.

shortcomings: the cable television transmission technology, is a joint project. A cross-industry for friend do monitoring, transmission in common cable syetem in the design, main products have the level of course. Radio frequency (rf) a lot of things or experience is very important, system debugging high technical requirements, must use specialized equipment.

monitoring transmission of wireless advantage analysis

1, the comprehensive cost is low, only a one-time investment, does not need to dig a trench buried pipe, distance is especially suitable for outdoor and already decorate good occasion; In many cases, users often due to the limitation of geographic environment and working content, such as mountain, ports, and open special geographical environment, such as the cable, cable transmission network wiring project inconvenient, adopt the cable construction period will be very long, even cannot achieve. Then, using the wireless monitoring can get rid of the shackles of cable, have short installation period, easy maintenance, expansion ability, quick cost advantages.

2, flexible networking, good scalability, plug and play, managers can quickly will the new wireless monitoring points added to the existing network, no need for the new transport network, increase equipment, easy to realize remote wireless monitoring.

3, low maintenance cost, wireless monitoring maintenance by the network provider of maintenance, the front-end equipment is plug and play, maintenance free system.