Method of transmitting broadband multimedia data on comprehensive business digital network

Abstract

The method includes creating B channel and transmitting multimedia data. Creation of B channel includes following steps: building initial B channel connection, negotiating about capacity parameters is carried out in initial B channel between calling and called ends by using information packets through RS error correction coding; Then, the called end feedbacks other calling number in B channel by using the said information packets; the calling end creates connection of other B channels. Transmitting multimedia data includes following steps: multimedia data are carried out RS error correction coding at sending end; multimedia data are packed; data packets are sent in sequence in n+k pieces of B channels; receiving end positions data packets, ordering, unpacking packets and carrying RS error correction decoding data.

Description

technical field [0001] The invention relates to a transmission method of multimedia information such as image, voice and data in multimedia communication, and specifically relates to a technology for transmitting multimedia data with a bandwidth of n×64Kbit / s on an ISDN. Background technique [0002] At present, the general method of transmitting multimedia data with a bandwidth of n×64Kbit / s on ISDN lines is to bind and align n B channels before performing data transmission. The equipment that completes the B channel binding and alignment functions is called a channel Aggregation Unit (CAU). figure 1 It is a schematic diagram of a system for transmitting multimedia data with a bandwidth of n×64Kbit / s using the traditional method. Two multimedia data terminal equipment (DTE) are connected to the ISDN network through the CAU. When the communication starts, the two parties first establish a link connection, and then the CAU Bind and align n B channels, and finally transmit mu...

AI Technical Summary

Problems solved by technology

Using this method has the following disadvantages: CAU equipment and its corresponding implementation software are required; during communication, if binding and alignment are lost due to slip code or other reasons, it is necessary to re-bind or disconnect, which will affect the communication The effect has adverse effects; although some methods stipulate that simple error detection processing can be performed on received data, forward error correction processing cannot be performed, so real-time data cannot be transmitted with a low bit error rate or even no error, especially in some error cases. rate up to 10 4 ~10 -3 It is almost impossible to carry out multimedia communication normally on ISDN lines

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