Position:(1)IP Over ATM
Came true to face connective ATM and the unity that do not have connective IP, used ATM rate integratedly the simple and agile, easy augment of advantage and the IP such as ability of support of big, much professional work mixes fast, size the characteristic of oneness, obtain a dominant position complementary;
(2)IP Over Ethernet
This kind of technology comes to what often mature discuss dispute to transmitting the data of disperse, but before IP faces what share without resource of bandwidth of net of connective technology, aether this kind to transmit mechanism and relative to narrower bandwidth, make agree with only the transmission that metabolic data sheds. And aether net dispute is synchronous, not sensitive to synchronism and clock, use aether network at freeway Sunday run is transmitted, need is solved shake accumulate with problem of breakdown fixed position. So these problems make aether net cannot assure a freeway the Qos that data of video of this kind of Sunday run, high capacity transmits.
But, exchange technical development as aether net, the occurrence that exchanges net of aether of type high speed made up for afore-mentioned inadequacy. Its are in what mechanism of first step setting, exchange, flow control reachs bandwidth respect function to change, optimize, the maturity of technology of Video Over IP and use means of GE Over WDM to relay to 3R of signal of GE of thousand aether net the view that monitored the technology that will realize Sunday run to transmit to change a tradition with function. Applied the aether net with extensive, low price to had realized a freeway gradually so so the function of 3 nets syncretic.
Through inspecting advantage of frequency digitlization, network to reach its to above realizable transmits low administrative levels of the form to discuss, we discover not hard, network transmits the number of the video in freeway Electromechanical system to be able to use all sorts of sound plan completely nowadays to come true, go solving, such as is nonstandard before avoiding interface, cost does not hold high fall and the technology is immature wait for a problem. Solved the digitlization of freeway video signal, sure pass the time in a leisurely way realizes a bottleneck that integral information digitlizes truly besides whole Electromechanical system. Such not only can use resource effectively, still can conference of collect video monitoring, video, can inspect wait for relevant function to be an organic whole to telling, the digital platform that can wait for its and GPS, GIS advanced technique conformity to be united for facilitates of centralized management and resource make full use of, formed the freeway intelligence with powerful function to change digital operation system so.
Although the freeway is at present fiber-optic amount / bandwidth resource is told to the application before relatively enough, but grow with the expands speed and demand quickness of current technology, development course of before the industry such as referenced communication, computer a few years, freeway Electromechanical system is comprehensive digital network already no time to delay. If say the network of freeway itself is the concept of a kind of narrow sense, so, as the country energetically build freeway infrastructure, finish " two vertical two horizontal strokes " strategic plan, as the overall message digitlization of freeway Electromechanical system, a relatively complete trunk network will be formed when arriving, form network of conceptual of a kind of broad sense and huge strategic natural resources. Become especially the formation of the whole nation that owns network of informatization of freeway of interface of public network standard, can make become widespread " national information freeway " , can bring this industry that nots allow to ignore for country and investor at the same time " limit benefit " . Will look with this, besides should have sober investment attitude, we should be mixed with the eye of development more long-term strategic thought is serious, reserve of the construction of system of scientific program freeway Electromechanical, resource and development foreground. And the impulsion of this process comes from just about at having a freeway " the soul " the digitlization of the Electromechanical system that say, network!
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