It's the trend that SDH will replace PDH in building information highway.
代替pdh的传输体制是高速信息公路的建设的未来趋势。
Today, the resource allocation problem in SDH network is always very important.
现代对SDH网络的研究中，资源分配问题一直得到很大的关注。
As an international communication standard. SDH is becoming the focus of the world.
同步数字序列(SDH)已成为国际通信标准，并日渐为世界各国所注目。
SDH has been greatly developed and used as a new transmission technology in the world.
SDH作为新的一代传输技术，已得到了各国的大力开发和应用。
SDH has been greatly developed and used as a new transmission technology in the world.
SDH作为新的一代传输技术，已得到了各国的大力开发和应用。
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