What are the SDH and PDH radios?
时间：04-09
整理：3721RD
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hello
waht are the SDH & PDH radios? pls explain.
waht are the SDH & PDH radios? pls explain.
http://en.wikipedia.org/wiki/Synchro...ital_Hierarchy
http://en.wikipedia.org/wiki/PDH
hello
I want to have information more precise than wikipedia.