OTN (Optical Transport Network) Is an optical transport network that provides transmission and multiplexing of digital data over DWDM wavelength channels. OTN protocol stack The OTN protocol stack consists of 4 layers: Optical Channel (Och) – the lower level of the protocols; OPU (Optical Channel Payload Unit) – user data unit; ODU (Optical Channel Data Unit) protocol – optical channel data unit; OTU (Optical Channel Transport Unit) is an optical channel transport unit. Optical channel The lower layer of the…