同步數位階層 tóng bù shù wèi jiē céng

DEFINITIONS

  1. synchronous digital hierarchy
  2. SDH

CHARACTERS

同 tóng
HSK 1
same, similar; together with
步 bù
HSK 2
step, pace; walk, stroll
數 shù number; several; count; fate
位 wèi
HSK 3
throne; position, post; rank, status; seat
階 jiē stairs, steps; rank, degree
層 céng story, layer, floor, stratum