IP over DWDM (IPoDWDM) is a technology used in telecommunications networks to integrate IP routers and network switches in the OTN ( Optical Transport Network). A true IPoDWDM solution is implemented only when the IP Routers and Switches support ITU-T G.709. [1] In this way IP devices can monitor the optical path and implement the transport functionality as FEC ( Forward Error Correction) specified by ITU-T G.709/Y.1331 [1] or Super FEC functionality defined in ITU-T G.975.1. [2]
This approach saves network components including shelves, processors, interfaces cards and hence it permits to reduce the power consumption, OPEX ( Operational expenditure) and CAPEX ( capital expenditure). This approach brings also a simplification of the network, eliminating the SDH/ SONET intermediate layer. [3]
A DWDM network can be implemented using different vendor technology from the IP devices as long as they support alien wavelength transmission specified by ITU-T G.698.2. [4] [5]