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一、引言二次群正码速调整异步复接技术中的同步复接设备是把经过码速调整的四个同步支路(S_1、S_2、S_3、S_4)数字流,合成一个其帧结构符合CCITT(见表1)规定的高速数字流(S_h)。二次群正码速调整异步复接技术中的同步分离设备是把高速数字流(S_h)分离成四个同步数字流(S_1′、S_2′、S_3′、S_4′)。其中S_1′、S_2′、S_3′、S_4′分别与S_1、S_2、S_3、S_4相对应。图1给出了在二次群正码速调整异步复接技术中同步复接设备_((T_1/T_2))和同步
I. INTRODUCTION Synchronous multiplexing device in asynchronous quadrature multiplexing technology of secondary group is to combine the digital streams of the four synchronous branches (S_1, S_2, S_3, S_4) after code rate adjustment to synthesize a frame with the same frame structure CCITT (see Table 1) provides high-speed digital stream (S_h). The synchronous separation device in the asynchronous quadratic multiplexing with quadrature group code is to separate the high speed digital stream (S_h) into four synchronous digital streams (S_1 ’, S_2’, S_3 ’, S_4’). S_1 ’, S_2’, S_3 ’and S_4’ correspond to S_1, S_2, S_3 and S_4, respectively. Figure 1 shows the synchronous quadrature multiplexing device _ ((T_1 / T_2)) and synchronization