Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS-1 timing source?()A、DUSB、line timingC、loop timingD、internal timingE、through timing

Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS-1 timing source?()

  • A、DUS
  • B、line timing
  • C、loop timing
  • D、internal timing
  • E、through timing

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