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permanent signal中文是什么意思

  • 不灭信号灯
  • 常设信号
  • 持久呼叫信号
  • 固定信号
  • 永久信号

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  • 百科解释
Permanent Signal (PS) in US telephony jargon, or Permanent Loop in British usage, is a condition in which a POTS line is off-hook without connection for an extended period of time. This is indicated in modern switches by the silent termination after the off hook tone times out and the telephone exchange computer puts the telephone line on its High & Wet list or Wetlist.
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