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With the ever improvement of SDH backbone network at home and abroad and the exponential growth of IP services, more and more attention are paid to POS signal. POS technology not only is the most important IP transmission way of backbone network, but also will be one of the core technologies in the next generation optical transmission network. In this paper the formulas for influence of HDLC frame alignment and ESC on link transport efficiency of POS signal are educed, on the basis of deeply study of POS technology and HDLC protocol. The results of this paper can offer many references to lucubrating POS technology.