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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
telecom. T-span
北美的 PCM-次群系统
telecom. T-1
北美的 PCM—次群 系统
: 3 phrases in 1 subject
Telecommunications3

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