SummaryThis Recommendation defines the requirements for the optical transport module of order n (OTM‑n) signals of the optical transport network, in terms of: – optical transport hierarchy (OTH); – functionality of the overhead in support of multi-wavelength optical networks; – frame structures; – bit rates; – formats for mapping client signals. The first revision of this Recommendation includes the text of Amendment 1 (ODUk virtual concatenation, ODUk multiplexing, backward IAE), extension of physical interface specification, ODUk APS/PCC signal definition and several editorial enhancements. |