This Recommendation provides physical layer inter-domain interface (IrDI) specifications for
optical networks which may employ wavelength division multiplexing (WDM). The IrDIs within the
optical transport network (OTN) are provided by unidirectional, p
ITU-T G.959.1-2006 history
2006ITU-T G.959.1-2006 Optical transport network physical layer interfaces Study Group 15