Summary

Recommendation ITU-T G.709/Y.1331 defines the requirements for the optical transport network (OTN) interface signals of the optical transport network, in terms of:

����������� OTN hierarchy

����������� functionality of the overhead in support of multi-wavelength optical networks

����������� frame structures

����������� bit rates

����������� formats for mapping client signals.

Corrigendum 1 corrects the value set of n_i in clause 17.12.