n.准同步数字系列;
例句:
Finally, transition mode from PDH to SDH is discussed.
最后讨论了PDH向SDH过渡的方式.
Suited for DC powered switching gear , multiplex , SDH , PDH , switching-mode power supply and electronic instruments.
适用于程控交换机 、 光端机 、 开关电源以及直流供电设备.
SDH has many advantages compared with traditional PDH.
同步数字系列(SDH)比传统的准同步数字系列(PDH)具有许多明显的优点.