Position:One, the carries end transmission mode of PSTN
This kind of mode basically is to use line to undertake long-range connective means comes to those who realize video image to transmit. As a result of network bandwidth and the problem of transmission quality, very inaccessible real time mixes the carries end transmission mode of PSTN successive transmission effect, transmit in the video image of the freeway so in do not use commonly.
2, net of ATM/SDH main force transmits mode
What ATM/SDH uses is trunk net transmission technology, no matter be the transmission quality of network bandwidth or network,have the transmission demand of image of video of can contented high quality. On the technology ATM acceptance wants the speech in a LAN function, WAN function, video and data to wait compositive into onefold agreement, the much point that this gives implementation single letter cause is shared offerred convenient.
Patulous ability: ATM allows to increase bandwidth and port density in existing structure;
Special bandwidth: It assured the continuity of business application, such fixed data sheds this pair of video transmit will tell is very important;
Apply extensively: ATM offerred end points to arrive the potential of the solution, means arrives with desktop system local area network, to net of of trunk , and WAN all can use ATM. But its defect also is apparent. Come true namely rise facility construction is complex, cost house does not fall high, at present so majority LAN gains ground more those who use is Ethernet. But remote the choice that number of high capacity video sends carrier as it is said will tell, what trunk net uses ATM still is to gain ground relatively;
3, aether net
Aether net is with bandwidth resource shares those who serve as transmission means, suit such as video to wait for those who secure data to transmit not quite, and more agree with the transmission that metabolic data sheds, if database, file is copied,wait. But as net of high speed aether (1000M) of the technology arisen mature gradually with what be used at the technology that aether net video transmits, open up is transmitted on aether net for video new approach.
Our focusing is in consultative respect to develop and rise abruptly of IP technology recently. IP technology uses the earliest at aether net data carry send, but the development as IP technology and mutual and as ceaseless as other technology confluence, make make one of the most practical agreements. It is Everything Over IP on one hand: As henceforth the development cornerstone of 3 nets syncretic, it is OK that all sorts of businesses include speech, video, data and multimedia to load undertakes transmission to IP; It is so called Anything Over IP:I on the other handThe business of P can be mixed through ATM, SDH, Ethernet final to load reachs the kind such as SDL undertake transmission on optical network.
Specific give priority to with the following kinds of forms:
Previous 1 2 34 5 Next
Related Articles
