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T-span
telecom.
北美 PCM 1.544Mb/s 传输系统端机之间的跨距,限于50英里,包含三个再生中继器,四段 span line, 每段15英里
T1北美的 PCM—次群系统
;
端机为 D1
;
线路为T1
;
传输标准
English thesaurus
T-span
telecom.
544Mb/s
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