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In recent days, optical fibers have been developed as a transmission medium to carry traffic in order to provide various services in telecommunications platform. Failure of this fibre caused loss of data which can interrupt communication services. Thus, this paper will focus about protection scheme in order to guarantee the survivability of the networks. Besides, the scheme should provide better quality...
Internet traffic has been growing quickly for many years and this growth will continue in the future (despite temporarily adverse economic conditions) requiring enhanced network technologies. Also to cope with this evolution, the cost of today's network solutions is still too high. In addition, in line with the EC goal of reducing the overall emissions, energy efficiency should be widely improved,...
Experimental validation of a service oriented optical network architecture based on SIP for on-demand session management is presented in this paper. The service set-up delay is evaluated under different traffic conditions and network equipment capabilities.
A Path Computation Element (PCE) is a computing device in a network capable of calculating paths. Once a PCE receives a path computation request, the PCE is suppose to provide a response within a reasonable short time. However, computing a feasible path is not a straightforward task, since the computational problem must consider several constraints in a short time. In this paper we propose an algorithm...
Quality of service (QoS) is an important objective of large telecommunications carriers. Network restoration is the prime capability needed to achieve this objective. While a large body of publications study and propose different restoration methods and network optimization algorithms, very few have actually been implemented. To address this, we present background on how today's large carrier terrestrial...
Network measurement provides vital information on the health of managed networks. The collection of network information can be used for several reasons (e.g., accounting or security) depending on the purpose the collected data will be used for. At the University of Twente (UT), an automatic decision process for hybrid networks that relies on collected network information has been investigated. This...
One of the major issues for telecom operators today is how to rapidly identify the cause of failure and affected services within a multi-layer and multi-domain network to achieve high-quality service on an end-to-end basis. To assess this issue, this paper describes a real-time root cause analysis mechanism, which can pinpoint an accurate root cause and identify the influence on services. We investigated...
This paper presents Comarch's work performed in the frame of Eureka/Celtic project MANGO - Management platform for Next Generation Optical networks, where we define and create a management platform for all-optical networks. The main issues considered within the project are (a) cross-layer automated fault and performance management, (b) complex Service Quality management and (c) management of optical...
A service level agreement (SLA) typically specifies the availability a service provider (SP) promises to a customer. Current schemes usually employ backup resources to achieve high SLA satisfaction. We propose a new provisioning framework, called service cluster (SC), which uses no explicit backup resources. By grouping several services with (typically) different availability specifications, an SC...
Network traffic demands grow explosively from multimedia, point-to-point, and E-Science applications. In order to meet such tremendous growth, optical networks has been introduced for exploring higher bandwidth and better QoS guarantee. Problems arise when integrating the whole new optical infrastructure with current IP backbone, including controlling data path and network management. In this paper,...
With increase in time-critical applications over the Internet, the need for differentiating services has become a major endeavor in research communities. One promising paradigm proposed to support such traffic diversity in the next-generation Internet is optical burst switching (OBS). In the literature, two simple but efficient approaches namely, threshold and wavelength-based techniques have been...
Optical packet switching (OPS) technologies are among the most promising solutions for next generation network architectures. Resource contention resolution and Quality of Service (QoS) management mechanisms have been developed in order to remedy the lack of optical buffering and implement multi-service support in OPS networks. In this paper we propose an analytical model for the access and core nodes...
In this work we develop a fair resource allocation scheme for a multi-class time-slotted optical overlapped code- division multiple-access (OV-CDMA) network. The resource management scheme is fair in the sense that the users have their power and rate allotted according to their quality of service (QoS) requirements. In addition, no class of users can dominate over the other classes. A unified framework...
In this paper we discuss the scope for introducing resilience in the optical layer. In particular we present a scenario analysis of a multilayer network where a range of optical and MPLS-based resilience solutions are mutually compared and the effect is quantified as a function of traffic demand and network size. Our results show that optical resilience becomes more cost-efficient than MPLS-based...
In order to realize the core networks of the future utilizing the translucent or transparent optical networks the DICONET vision is presented in this article. Providing ultra high-speed end-to-end connectivity with quality of service and high reliability through the exploitation of optimized protocols and lightpath routing algorithms that will complement a flexible control and management plane is...
In this paper, we study bandwidth management of a wireless/optical based access/metro network in support of voice and data services. For voice services, we use a finite state Markov Chain to estimate the blocking probability of voice circuits over an Adaptive modulation and coding wireless channel, as a function of the channel parameters. For data services, we evaluate a rate matching and a buffer...
We show that a sensitivity of 0.5 dB is required for using Q-factor to monitor noise for fault localization and analyze monitoring without dispersion compensation in 10 Gb/s networks with symmetric dispersion maps.
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