Optical transport network (OTN)
An OTN network is composed of a set of optical NEs connected by optical fiber links. These NEs are able to provide functions such as transport, multiplexing, routing, management, supervision, and protection (survivability) of client signals, according to the requirements specified in REC. G.872.
lCompared with SDH and SONET networks, an OTN network has the following features:
Ultra capacity with high accuracy, T-bit/second per fiber over DWDM lines pService transparency for client signals
Asynchronous mapping, powerful FEC function, simplified network design, and reduced costs
lCompared with traditional WDM networks, an OTN network has the following features:
Enhanced OAM and networking capabilities for all services
Dynamic electrical/optical-layer grooming
OTN Network Layers and Port Structure
lOPUk: optical channel payload unit-k
lODUk: optical channel data unit-k
lOTUk: completely standardized optical channel transport unit-k
lOTUkV: functionally standardized Optical channel transport unit-k
lOCh: optical channel with full functionality
lOChr: optical channel with reduced functionality
lOMS: optical multiplex section
lOTS: optical transmission section
lOPS: optical physical section
lOTM: optical transport module
