Virtual concatenation

About: Virtual concatenation is a research topic. Over the lifetime, 275 publications have been published within this topic receiving 2414 citations.

Generic framing procedure (GFP): the catalyst for efficient data over transport

Abstract: We discuss the generic framing procedure (GFP) in the context of emerging nontraditional data over transport applications. Coupled with complementary efforts to define virtual concatenation, automatic link capacity adjustment schemes, and distributed control planes for transport networks, we contend that GFP serves as the catalyst for efficient and standard data over transport service offerings.

System and methods for selectively transmitting ethernet traffic over SONET/SDH optical network

Abstract: An interface for an optical node with a plurality of input ports and output ports in SONET/SDH optical network connected to a plurality of virtual concatenation channels has a plurality of input ports for taking Ethernet signals as inputs, and a plurality of output ports for selectively outputting Ethernet frames in the Ethernet signals to the virtual concatenation channels A method classifies the Ethernet input pipes in a SONET/SDH network with a plurality of virtual concatenation channels, and allocates the classified packets onto the virtual concatenation channels

Combined SONET/SDH and OTN architecture

Abstract: Architecture for efficient processing of the evolving OTN transmission technology, standardized under ITU-T G.709, in conjunction with existing and emerging SONET/SDH protocol signals, standardized under ANSI T1.105/ITU-T G.707. The new architecture allows processing the SONET/SDH signals, and/or OTN signals, and/or SONET/SDH mapped into OTN signals more efficiently. The architecture further allows processing and multiplexing of lower order signals into a higher order signal such as quad OC-192 into OC-768 or quad OC-192 into OPU3 and OTU3. This architecture uses an embedded processor to process some of the signals' overhead in software, contributing to an additional level of flexibility in the processing. This architecture enables customization and allowing for future standard updates and upgrades. The architecture can be upgraded to SONET OC-3072, SDH STM-1024 and OTU4, which currently are not standardized. The architecture can also be used for the implementation of SONET OC-192 with OTN OTU2.

Survivable multipath provisioning with differential delay constraint in telecom mesh networks

Abstract: Survivability is a critical concern in modern telecom mesh networks because the failure of a network element may cause tremendous data and revenue loss in such networks using high-capacity optical fibers employing wavelength-division multiplexing (WDM). Multipath provisioning is a key feature of next-generation SONET/SDH networks (which can be used on top of optical WDM), and they can support virtual concatenation (VCAT); thus, multipath provisioning can significantly outperform single-path provisioning in resource efficiency, service resilience, and flexibility. However, in multipath provisioning, differential delay is an important constraint that should be considered. We investigate survivability of service paths based on differential-delay constraint (DDC) and multipath provisioning together in telecom backbone mesh networks. We propose the Shared Protection of the Largest Individual Traversed link (SPLIT) method for survivable multipath provisioning and present a DDC-based algorithm for multipath routing subject to DDC. We also compare the DDC-based algorithm with the K shortest link-disjoint paths (KDP) algorithm, using SPLIT, under dynamic service requests. We find that exploiting link-disjoint paths is very efficient for survivable multipath provisioning, and our algorithm is resource-efficient, has low signaling overhead, and has fast fault recovery for survivable multipath provisioning with DDC. For a 5-ms DDC, our algorithm can decrease the bandwidth blocking ratio (BBR) significantly in typical U.S. backbone networks.

Method for mapping and multiplexing constant bit rate signals into an optical transport network frame

Abstract: A method for mapping and multiplexing of constant bit rate (CBR) signals into optical transport network (OTN) frames is provided. The method, in addition, enables the transportation of data from a plurality of SONET/SDH clients through a single OTN frame. The preferred method thereby enables efficient adoption of SONET/SDH legacy equipment by OTN networks.