Video monitoring, it is one of most fundamental industry application that telegraphic operation business provides. Before, this application basically is based on fixed network, will come true through wired means; Now, accompanying the flying development of wireless network technology, wireless video monitoring rises to surface. On one hand, it is passed wireless change, cast off the limitation of wire cable, enhanced flexibility greatly, reduced cost; On the other hand, the ceaseless development of wireless video transmission technology, group net technology, terminal technology, the function that also lets wireless video monitoring promotes ceaselessly, make its can rival wired means increasingly.
Wireless changing is direction
Long-term since, video supervisory system basically is used at the surveillance that counterpoise wants section or nods remotely and control, video monitoring technology is in system of traffic of power system, telegraphic computer room, factory, city, irrigation works, village the domain such as public security also received wider and wider application. Video supervisory system nods monitoring the video that collects in real time to shed real time ground to transmit monitoring center, facilitating monitoring center undertakes long-range monitoring, seasonable to breaking out incident direct deals with.
The video monitoring that is based on traditional wired network implementation is existing apparent weakness. These defect include: Cloth dot accepts restriction, the option that monitoring chooses is being stood by commonly wired the place that accepts a point, this kind of means limitted the flexibility that cloth nods; Amount of cloth dot project is large, need laid reticle and fiber-optic, as a result of the project of fundamental network the quantity often is met very big, because this general and wired monitoring applies to the situation that already was existed in fundamental network quite; Project cycle is long, laid base network costs bad news force; Be deficient in flexibility, expand and adjust inconvenience, can increase project amount and needless fundamental network construction; Lack mobile sex, this is the congenital blemish of wired network.
To solve afore-mentioned problems, emerge as the times require of wireless video monitoring, made video monitoring complete because of,be cast off thereby wired and a variety of brought limitation. Can foreknow, accompanying wireless video monitoring the abidance of relevant technology progresses, wait like terminal technology, group net technology, transmission technology, business of wireless video monitoring will make one of application with wireless network the most typical technology, also will become wireless city " killer mace " one of application.
Improve monitoring terminal
Wireless video business is led to be being piled up by accident, switch efficiency, when delay, the respect demand such as bandwidth stability is higher, if these respect processing are bad, video picture will appear mosaic, jump screen, halt. Well-known, WLAN technology does not ask to design according to system of telegraphic extensive operation at first, in its foundation version do not have a regulation to straddling the issue of AP switch, run-of-mill terminal is in the switch efficiency between AP is very low. Additional, do not have special processing to video business to AP and terminal, like data of common PS region, these elements can be brought about cannot very good begin the real time professional work such as video monitoring, speech.
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