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sdh接口类型有哪几种？
标准的SDH接口应该是STM-1(155.520Mbit/s)、STM-4(622Mbit/s)、STM-16(2.5Gbit/s)、STM-64(10Gbit/s)、STM-256(40Gbit/s) SDH设备的支路可以承载PDH的信号，常见的如1.5M、2M、45M、139M等。 MSTP(多业务传送平台)严格意义上来说也是SDH设备，除了具备以上业务接口类型之…
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