请教一下STM-1的容量问题？

liulian_124

<p><span style="LINE-HEIGHT: 150%;">在资料上看到“一个</span><span style="LINE-HEIGHT: 150%;">STM-1</span><span style="LINE-HEIGHT: 150%;">信号只可以复用进</span><span style="LINE-HEIGHT: 150%;">1</span><span style="LINE-HEIGHT: 150%;">个</span><span style="LINE-HEIGHT: 150%;">140Mbit/s</span><span style="LINE-HEIGHT: 150%;">的信号，此时</span><span style="LINE-HEIGHT: 150%;">STM-1</span><span style="LINE-HEIGHT: 150%;">信号的容量相当于</span><span style="LINE-HEIGHT: 150%;">64</span><span style="LINE-HEIGHT: 150%;">个</span><span style="LINE-HEIGHT: 150%;">2Mbit/s</span><span style="LINE-HEIGHT: 150%;">的信号。</span><span style="LINE-HEIGHT: 150%;">同样的从</span><span style="LINE-HEIGHT: 150%;">34Mbit/s</span><span style="LINE-HEIGHT: 150%;">的信号复用进</span><span style="LINE-HEIGHT: 150%;">STM-1</span><span style="LINE-HEIGHT: 150%;">信号</span><span style="LINE-HEIGHT: 150%;">STM-1</span><span style="LINE-HEIGHT: 150%;">可容纳</span><span style="LINE-HEIGHT: 150%;">3</span><span style="LINE-HEIGHT: 150%;">个</span><span style="LINE-HEIGHT: 150%;">34Mbit/s</span><span style="LINE-HEIGHT: 150%;">的信号，即有</span><span style="LINE-HEIGHT: 150%;">48个2Mbit/s</span><span style="LINE-HEIGHT: 150%;">的容量。</span><span style="LINE-HEIGHT: 150%;">从</span><span style="LINE-HEIGHT: 150%;">2Mbit/s</span><span style="LINE-HEIGHT: 150%;">信号复用进</span><span style="LINE-HEIGHT: 150%;">STM-1</span><span style="LINE-HEIGHT: 150%;">信号时，</span><span style="LINE-HEIGHT: 150%;">STM-1</span><span style="LINE-HEIGHT: 150%;">可容纳</span><span style="LINE-HEIGHT: 150%;">3×7</span><span style="LINE-HEIGHT: 150%;">×<span>3=63</span></span><span style="LINE-HEIGHT: 150%;">个</span><span style="LINE-HEIGHT: 150%;">2Mbit/s</span><span style="LINE-HEIGHT: 150%;">信号。”</span></p><p><span style="LINE-HEIGHT: 150%;">除了<span style="LINE-HEIGHT: 150%;">从</span><span style="LINE-HEIGHT: 150%;">2Mbit/s</span><span style="LINE-HEIGHT: 150%;">信号复用进</span><span style="LINE-HEIGHT: 150%;">STM-1</span><span style="LINE-HEIGHT: 150%;">信号，</span><span style="LINE-HEIGHT: 150%;">STM-1</span><span style="LINE-HEIGHT: 150%;">可容纳</span><span style="LINE-HEIGHT: 150%;"><span>63</span></span><span style="LINE-HEIGHT: 150%;">个</span><span style="LINE-HEIGHT: 150%;">2Mbit/s</span><span style="LINE-HEIGHT: 150%;">信号（可以从复用结构图中看出）这个能够理解，其他的容量问题就不能想明白，不明白是怎么计算的，为什么不是<span style="LINE-HEIGHT: 150%;">140Mbit/s的容纳70个<span style="LINE-HEIGHT: 150%;">2Mbit/s</span><span style="LINE-HEIGHT: 150%;">的信号，<span style="LINE-HEIGHT: 150%;">34Mbit/s</span><span style="LINE-HEIGHT: 150%;">的容纳51个2<span style="LINE-HEIGHT: 150%;">Mbit/s</span><span style="LINE-HEIGHT: 150%;">的信号？</span></span></span></span>哪位大虾能够指点一下。</span></span></p>