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(2)SDH的信息结构分成若干标准等级,称为同步传送模块STM-1,传送速率为155.20Mb/s;4个STM-1同步复用构成STM-4,传送速率为4×155.20Mb/s=622.080Mb/s;4个STM-4(或16个STM-1)同步复用
(2) SDH information structure is divided into a number of standard grades, called the synchronous transfer module STM-1, the transfer rate of 155.20Mb / s; 4 STM-1 synchronous multiplexing constitute STM-4, the transfer rate of 4 × 155.20Mb / s = 622.080 Mb / s; 4 STM-4s (or 16 STM-1s) are multiplexed simultaneously