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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
Telecommunications
3
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