Method to Improve the Protection Switching for Optical Transport Networks
Original Publication Date: 2003-Sep-25
Included in the Prior Art Database: 2003-Sep-25
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The purpose of this invention is to improve the business opportunity for protection switching in the optical layer and the applicability of integrated OXC (Optical cross Connect) -applications. The field of this invention is the technical realization of shared protection switching in optical networks at competitive cost, using leveraging existing signaling methods. The current solution to protect network connections for the OTN (Optical Transport Network) according to the recommendation of the International Telecommunications Union ITU Rec. G.709 is quite cost-intensive. For analysis and application scenarios in the network, a reference network architecture is used (Figure 1). Optical channels, fiber or lambda of a Wavelength Division Multiplexing (WDM) system, interconnect the n sites of the reference model. The optical channels do not share the same risk of failure, i.e. they are physically located in disjoint ducts and are not elements of the same Shared Risk Link Group (SRLG). For example if we assume n = 3, there would be six OTN-multiplexer (MUX) involved in the network scenario. The OTN-multiplexer is the equipment terminating the optical channel. The basic functionality of the MUX is to aggregate m low data rate client signals to one high data rate line signal transported on the optical channel, when m > 1. In general, the new method is applicable to networks where several sites build a mesh or ring.