Concatenation mode (16 nodes) digital optical transceiver has taken the world first-class technology of digital video non-compression transmits, TDM and ADM with optical transmitting platform which contains 2.5G. It could transmit 16 channel single/bi-directional video through one single fiber-optics at the same time, and also could choose the digital signals of multi-channel audio/data/Ethernet/telephone/E1/switches value. It has made great progress to improve the saving for the usage and investment of fiber optics. With 16 nodes at least, the remote equipment could receive 1-4channel video signals, and the terminal equipment could transmit more than 16 channel video. Supporting the real-color, hi-fi (surveillance), full template, motive/static picture, real-time and long distance transmit the data with best and high quality. When there are any failures of node s in the chain circuit system occur, it could select self-protection functions and screening failure automatically, and then connect to the next node directly. In order to ensure the non-failure node operating well, people could choose the network management model to realize the network management function of the whole link.