Some issues such as clock, fault propagation, flow control and auto-negotiation are analyzed in detail and solutions to the problems are also presented.

详细分析了时钟、故障传递、流量控制和自协商相关的透明传输问题，相应的解决方案也同时提出。

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A method of selecting the clock sources, which is used in SDH network to auto-select the best clock, is di-cussed.

介绍了一种时钟源选择控制方法，从而在SDH网络中各节点能自动选择最优时钟源，并实现时钟的同步。

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