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问题

Which three of these


Which three of these are optical channel data unit (ODU) overhead fields? ()

  • Ageneral communication channel 0 (GCC0)
  • Bsection monitoring
  • Creserved (RES)
  • Dgeneral communication channels 1 and 2 (GCC1 GCC2)
  • Etandem connection monitoring activation deactivation (TCM ACT)
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