同步网（ｓｙｎｃｈｒｏｎｉｚａｔｉｏｎｎｅｔｗｏｒｋ）为电信网内所有电信设备的时钟（或载波）提供同步控制信号，使它们的频率工作在共同速率（或频率）上的支撑网。功能数字网内任何两个数字交换设备的时钟速率差超出规定值时，编码后的离散脉冲信号在缓冲在储器中... Synchronizationnetwork Synchronization control signals are provided for the clocks (or carriers) of all telecommunication devices in a telecommunications network so that their frequencies work on a common network of rates (or frequencies). Functional digital network any two digital switching equipment when the clock rate difference exceeds the specified value, the encoded discrete pulse signal in the buffer memory ...