DATA TRANSMISSION METHOD, SYSTEM AND APPARATUS IN AN OPTICAL TRANSPORT NETWORK

摘要

A data transmission method, system and apparatus in an optical transport network are provided. The data transmission method in an optical transport network comprises: mapping at least a pair of obtained 0-rank optical channel data units to an optical channel data tributary unit, to form an optical channel data tributary vkt, t being equal to2 or 3, the optical channel data tributary vkt having the same external structure as an optical channel data tributary kt; mapping the optical channel data tributary vkt into ith time slot and (i+n)th time slot of a 1.25G level t-rank optical channel data unit, and indicating at least a pair of 0-rank optical channel data units carried in the ith time slot as a k-rank optical channel data unit, and transmitting to a target node. The data transmission system in an optical transport network comprises: a sending network node, a transport network node with 2.5G time slot structure, a receiving network node with 1.25G time slot structure. The network node comprises: a data obtaining unit, a mapping unit and a mapping transport unit. Transmission of data in an optical transport network is realized.