- sdh terminal
- 同步: synchronization; synchronism ...
- 数字: figure; digit; numeral; char ...
- 系列: succession; series; bank; se ...
- 终端: terminal; terminus; terminat ...
- 同步数字系列: sdh synchonos digita hieachy; sdh synchronous digital hierarchy; sdhsynchronousdigitalhierarchy; synchronous digital hierarchy sdh
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