The evolution of transport network survivability

Manchester, J.; Bonenfant, P.; Newton, Curtis J.

doi:10.1109/35.783124

Cited by 50 publications

(22 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Protection schemes are typically faster than restoration. Recovery time under 50 ms can be provided [14,15]. Varying protection levels can be provisioned, ranging from 1+1, 1:1, to 1:N depending on user demands and budgetary constraints.…”

Section: Network Survivability Strategiesmentioning

confidence: 99%

Analysis of Connection Availability in an All-Optical Mesh Network

Wosinska

Svensson

2007

Fiber and Integrated Optics

View full text Add to dashboard Cite

This paper presents the method of an availability performance analysis that can be used for all-optical networks. We compare different schemes of protection and restoration in a fully connected mesh network based on optical cross-connects, optical fibers, and fiber amplifiers. Specifically treated is an optical mesh network physically mapped onto a Scandinavian backbone. In order to compare different survivability strategies, we selected two nodes located roughly 420 km apart. The goal of this work is to point out possible ways to improve connection availability. A number of survivability schemes are compared, for which the availability model of logical connection is derived and a calculation procedure is described. Our results show that unprotected schemes cannot ascertain reasonably high requirements on connection availability in the backbone network. Thus, if a redundant structure of logical connection is considered, the particular survivability scheme should be evaluated in order to maximize connection availability.

show abstract

Section: Network Survivability Strategiesmentioning

confidence: 99%

Analysis of Connection Availability in an All-Optical Mesh Network

Wosinska

Svensson

2007

Fiber and Integrated Optics

View full text Add to dashboard Cite

show abstract

“…The reliability issues for the WDM rings have already been considered in the literature (see, e.g., References [8,9]). The main contribution of this paper is to propose the path accommodation methods for the OCTDM rings by incorporating the existing reliability techniques.…”

Section: Introductionmentioning

confidence: 99%

A path accommodation method for reliable ring networks with optical compression TDM

K¹,

Yamaguchi²,

Gokyuu³

et al. 2002

Int J Communication

View full text Add to dashboard Cite

SUMMARYVery high-speed optical ring networks were recently developed for metropolitan area network (MAN). In such high-speed networks, survivability is a very important issue since a single failure leads to a disastrous service interruption. In this paper, we propose a design method for the reliable ring network based on optical compression TDM. We assume a single failure; at most a single link fails at a time. We then propose methods to establish paths accommodating all traffic demands among nodes. As protection/restoration methods, we consider a dedicated path protection, a shared path protection, and a path restoration method. For these networks, we first derive theoretical lower bounds on the numbers of slots and frames in order to accommodate all paths among nodes. We next propose path accommodation algorithms which allocate paths to slots in order to achieve the theoretical lower bound as closely as possible. Our proposed path accommodation methods are evaluated through several numerical examples. Three protection/ restoration methods are also compared by applying our algorithms in order to investigate which method is suitable for optical compression TDM. The numerical results show that the shared path protection and path restoration methods can achieve better performance than the dedicated path protection method.

show abstract

“…The traditional restoration methods of SDH/SONET networks, currently the primary metropolitan area transport networks, have been studied extensively. In the ring topology, the self-healing ring (SHR) architectures (bidirectional SHR and unidirectional SHR) are widely used in telecommunication networks [1,2]. SHR has fast restoration time (450 ms) with simple and standardised protocols, but the spare capacity required for restoration reaches nearly half of the total transmission capacity.…”

Section: Introductionmentioning

confidence: 99%

Performance estimation of the protection with LCAS and virtual concatenation in metropolitan area networks

Yang

Zhang

et al. 2005

Eur. Trans. Telecomm.

View full text Add to dashboard Cite

SUMMARYThe new techniques, link capacity adjustment scheme (LCAS) and virtual concatenation not only make SDH/SONET networks accommodate the data service efficiently, but also provide a high-layer protection for client services, under which no spare capacity needs to be reserved for protection and the service transmission continues unless all concatenated links have failed. In this paper, we analyse the performance of this kind of protection in ring topology and mesh topology respectively. The results show that the timeto-transmission halt for the first time exceeding 1 year can reach 99.999%, if the number of the independent concatenated links is greater than two. In addition, the protection performance is analysed in detail given the granted maximal decrease ratio of the service transmission bandwidth.

show abstract

The evolution of transport network survivability

Cited by 50 publications

References 2 publications

Analysis of Connection Availability in an All-Optical Mesh Network

Analysis of Connection Availability in an All-Optical Mesh Network

A path accommodation method for reliable ring networks with optical compression TDM

Performance estimation of the protection with LCAS and virtual concatenation in metropolitan area networks

Contact Info

Product

Resources

About