STM-1的帧结构为以字节为基本单位的矩形块状结构,大小为_____行,____列,其中RSOH占第_________行第________列,MSOH占第_________行第_________列,AU-PTR占第_________行,共________个字节. STM-1的帧结构为以字节为基本单位的矩形块状结构,大小为_____行,____列,其中RSOH占第_________行第________列,MSOH占第_________行第_________列,AU-PTR占第_________行,共________个字节.