OTN——Optical Transport Network

OTN ( optical transport network, the OpticalTransportNetwork ), is based on wavelength division multiplexing technology as the foundation, the layers in the optical network transmission network, is the next generation backbone transmission network. OTN through G.872, G.709, G.798 series ITU-T recommendations for a new generation of" digital transmission system" and" optical transmission system". OTN will solve the traditional WDM networks without wavelength / sub wavelength service dispatching capability, network ability is weak, the protection ability and so on.

Optical transport network for the IP business, adapting IP service transfer requirement has become the next step in the development of optical communication is an important issue. Optical transport network from various angles and aspects to provide the solution, in compatible with the existing technology, SDH equipment due to a large number of applications, in order to solve the problem of data processing and transmitting, based on the SDH technology research and development of MSTP equipment, and in the network has a large number of applications, good compatibility of the prior art, but also to meet the data transmission function. But along with the data service granules and the capacity for the processing of more detailed requirements, the business of transmission network put forward the demand of two respects : on the one hand transport network to provide large pipes, then the generalized OTN ( OTH technology in the electrical domain, in the optical domain for ROADM ) offers a new solution, which solution SDH based on VC-12 / VC4 cross particles small, scheduling more complex, not adapting to large particles business transfer demand problem, also partially overcome the WDM system fault location difficulty, to the point to point connection based networking, networking capability, able to provide network survivability means and ability weak shortcomings; another business of optical transport network presents a more detailed processing requirements, the industry also put forward the packet transmission network solution, is currently involved in the main technologies include T-MPLS and PBB-TE etc..