Delay distributed VCAT for efficient data-optical transport

Alicherry, Mansoor; Phadke, Chitra; Poosala, Viswanath

doi:10.1109/ofc.2005.193009

Cited by 11 publications

(8 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table II shows the bandwidth efficiency of VCAT compared with CCAT. 12 Mbps] in one VCG to transmit 100 Mbps Ethernet data. Such heterogeneous combination of VC's in one VCG is termed as cross virtual concatenation (CVC).…”

Section: Bandwidth Efficiencymentioning

confidence: 99%

See 1 more Smart Citation

VCAT synchroniser—reduction of buffer size in VCAT enabled next generation SDH networks

Manke

Khare

Sapre

2011

Trans Emerging Tel Tech

View full text Add to dashboard Cite

Next generation synchronous digital hierarchy is a popular transport technology for integrated voice and data communication. It typically uses virtual concatenation (VCAT) for dynamic bandwidth management. This paper discusses different issues related to VCAT. Paper mainly focuses on the differential delay that occurs as all the VCAT members traverse through different path to reach the destination. These streams do not reach the destination at the same time and thus incur differential delay. Buffers are provided at the receiver to compensate for differential delay. The larger the differential delay, the larger is the buffer requirement at the receiver. Differential delay/buffer size can be reduced by proper routing of the traffic. In the existing receiver circuits, all incoming streams are allocated the same buffer space, specifying the maximum differential delay it can compensate. This results in a large buffer requirement. To overcome this limitation, this paper proposes a novel scheme of allocating buffers dynamically to all the streams. To achieve this, differential delay between the streams is computed by extracting the multiframe indicator and then as per the delay, each stream is allocated buffer space from a common buffer pool. The common buffer pool consists of a number of buffer modules. The size of each module is equal to the frame size for the specific virtual channel, and the size of the common buffer pool is architecture dependent. Sixty per cent reduction in the buffer requirement is predicted using this scheme, at the receiver. For functional verification of the concept, a hardware circuit is designed.

show abstract

Section: Bandwidth Efficiencymentioning

confidence: 99%

“…Research paper [12] came up with an improvement over VCAT, called DD-VCAT, which allows higher utilisation and lower costs through flexible distribution of buffers. By decreasing the differential delay at the destination, we can effectively reduce the amount of buffer space needed.…”

Section: Existing Approachesmentioning

confidence: 99%

VCAT synchroniser—reduction of buffer size in VCAT enabled next generation SDH networks

Manke

Khare

Sapre

2011

Trans Emerging Tel Tech

View full text Add to dashboard Cite

show abstract

“…Such cycles are usually undesired in networking but in the MP context they can compensate for delay differences without adding buffering capabilities at the destination nodes or transit nodes of a path, as proposed in [2].…”

Section: Introductionmentioning

confidence: 99%

Differential delay constrained multipath routing for SDN and optical networks

Alvizu

Maier

Tornatore

et al. 2016

Electronic Notes in Discrete Mathematics

View full text Add to dashboard Cite

“…Hence, centralized DDC results in increasingly large buffer structures that may hinder the network costeffectiveness [8]. Alternatively, recent studies [9,10] have proved that distributing the DDC operations throughout the intermediate path nodes leads to a substantial reduction on the size of the buffers. Such DDC distribution has already been implemented and demonstrated [11] in an opaque optical network scenario, i.e., considering that the optical signal is electronically processed at each hop.…”

Section: Introductionmentioning

confidence: 99%

Optical transport network design with collocated regeneration and differential delay compensation

Santos

Pedro

Eira

et al. 2012

2012 IEEE 13th International Conference on High Performance Switching and Routing

View full text Add to dashboard Cite

A potentially cost-effective approach for augmenting the transmission capacity in an optical transport network (OTN) consists of bundling several optical channels by means of an inverse-multiplexing strategy, e.g. virtual concatenation (VCAT). When VCAT is employed together with multipath routing, the differential delay between concatenated channels needs to be compensated via electrical buffering. To avoid installing large and costly high-speed buffers, this compensation can be dispersed throughout the intermediate path nodes. With this distributed scheme, each intermediate compensation operation requires an optical-electrical-optical (OEO) converter. Such converters, which are typically employed to allow electrical processing (e.g. signal regeneration, traffic switching/grooming, etc.), represent the largest contributor to the capital expenditures of an optical network. Hence, to save on OEO equipment and keep the network cost-effectiveness, we propose the novel approach of collocating the differential delay buffering and the regeneration on the same network element, enabling the implementation of distributed schemes with minimal link capacity levels, OEO count, and buffer size requirements. To effectively design an OTN network under these conditions, we also present a new multi-step optimization framework based on integer linear programming (ILP) modeling. To test our approach, emerging 100 Gb/s Ethernet services are established over two reference networks using virtually-concatenated 40 Gb/s channels. The correspondent results confirm that relevant OEO/regenerator count savings (ranging from 23% to 44%) can be attained with the collocated approach while the buffer sizes are maintained reasonably small. We also show that the end-to-end transmission latency is not affected by the adoption of this collocated strategy.

show abstract

Delay distributed VCAT for efficient data-optical transport

Cited by 11 publications

References 1 publication

VCAT synchroniser—reduction of buffer size in VCAT enabled next generation SDH networks

VCAT synchroniser—reduction of buffer size in VCAT enabled next generation SDH networks

Differential delay constrained multipath routing for SDN and optical networks

Optical transport network design with collocated regeneration and differential delay compensation

Contact Info

Product

Resources

About