Summary

Recommendation ITU-T M.1400 covers the designations of interconnections among operators' networks of circuits, groups, group and line links, digital blocks, digital paths, data transmission systems, digital blocks created between digital circuit multiplication equipment (DCME), virtual containers and multiplex sections.

The designation information is in two layers:

–           Layer 1: The unique information; the designation;

–           Layer 2: Additional information; the related information.

Guidance for the user is provided in a series of examples.

Recommendation ITU-T G.709 (2016) has introduced support for optical transport networks with rates beyond 100 Gb/s.

This Amendment 1 to ITU-T M.1400 introduces new function codes for the corresponding optical channel data units (ODUs) and optical channel transport units (OTUs). It also corrects a few editorial inconsistencies.