1- OTN is Transmission protocol for high speed and high capacity . Can transmit up to 400 gbps over single channel.
It has 2 main layers :
- Layer 0 is optical layer
- Layer 1 is electrical layer
Optical layer is composed of multiple stages which is
1- OCH ( optical channel ) which is the wavelength that Carry information.
2- OMS ( optical multiplex section ) which is from mux to demux and vice versa and used to multiplex multiple channels and carriers to the same optical fiber cable.
3- OTS ( optical transmission section ) which is after the amplifier and attention stage
Electrical layer is composed also of 3 stages :
1- OPU-K ( optical payload unit ) which is the first layer as we take the signal from the client side and BSC in the form of ( SDH , Ethernet , ATM ) and convert it to OTN payload by adding the justification bytes to make synchronization.
2- ODU-K ( optical Data unit ) which is the second layer as we add information called SM . PM is the path monitoring information related to the path of data , error detect and correct , other control informations .
3- OTU-K ( optical transport unit ) it's is the last layer and we add SM information which is section monitoring.
