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词汇
PSTN
释义
PSTN
公用电话网(=Public Switched Telephone Network)
是以传统铜线作为传递媒介的电信局,且是一种传统过时的电话网路,设备复杂而且维修不易,频宽窄,且时常会有许多杂音及停顿,自然就不能如光纤网路那般提供许多附加服务。
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更新时间:2025/4/14 2:30:03