Optical network survivability beyond the core

2002 ◽  
Author(s):  
Muriel Medard
Keyword(s):  
Optical Network ◽  
Network Survivability ◽  
The Core

scholarly journals Survivable Physical topology design for Alloptical Metro core networks

2013 ◽  
Author(s):  
Nguyen V. Hanh ◽  
Truong Dieu Linh
Keyword(s):  
Network Topology ◽  
Fiber Optic ◽  
Optical Network ◽  
Numerical Results ◽  
Network Survivability ◽  
Topology Design ◽  
Network Nodes ◽  
Core Networks

Along  with  the  development  of  bandwidth consuming  services,  fiber  optic  is  being  widely  used, especially  in  the  metro  core  networks.  Many  solutions have  been  proposed  for  designing  optical  network topology.  However,  these  solutions  designed  networks with  a  lot  of  fiber  redundancy.  This  paper  proposes  a solution for designing physical topology of optical metro core  networks with the  objectives of (i) ensuring traffic requirements  between  the  network  nodes,  (ii) minimizing  fiber  cost,  and  (iii)  assuring  the  network survivability.  The  numerical  results  show  that  the proposed  solution  satisfies  those  objectives  and  save more fiber than existing solutions.

Optical Network Survivability

2008 ◽  
pp. 383-390
Author(s):  
N. S.C. Correia ◽  
M. C.R. Medeiros
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Network ◽  
Network Survivability ◽  
Single Fiber ◽  
Fiber Failure ◽  
Wavelength Division ◽  
Optical Wdm ◽  
Service Interruption ◽  
Equipment Failures ◽  
Electrical Cables

The telecommunications world is evolving dramatically toward challenging scenarios where the fast and efficient transportation of information is becoming a key element in today’s society. Wavelength division multiplexing (WDM) technology has the potential to satisfy the ever-increasing bandwidth needs of the network users on a sustained basis (Mukherjee, 2000). Network operators must provide uninterrupted service to their customers, that is, network survivability must be guaranteed. This means that, networks must be able to handle link or fiber cuts as well as equipment failures, fact that influences the design and operation of networks (Gerstel & Ramaswami, 2000). When using WDM, survivability becomes even more important because of the huge amount of traffic carried by a single fiber. A single fiber failure, even for few seconds, can be catastrophic (Maier, Pattavina, Patre & Martinelli, 2002). This issue is actually very important since the optical WDM technology is now being deployed in the field. Network survivability is not just an academic subject. In real networks, failures happen quite frequently (fiber cuts, for example, are very common in terrestrial networks since they share other utility transport conduits, such as gas or water pipes and electrical cables, and are considered the least reliable component (Gerstel & Ramaswami, 2000; Maier, Pattavina, Patre & Martinelli, 2002). The prevention of service interruption, or the reduction of the service loss when failures occur, must now be an integral part of the network design and operations strategy or otherwise severe service losses can happen.

Research on the Capability of Survivability in Optical Network

2011 ◽  
Vol 204-210 ◽  
pp. 2176-2179
Author(s):  
Ning Zhang
Keyword(s):  
Optical Network ◽  
Data Communication ◽  
Wdm Networks ◽  
Light Path ◽  
Core Network ◽  
Link Failures ◽  
The Core ◽  
Single Link ◽  
Static Mechanism ◽  
Set Up

Survivability is the capability of a network to maintain service continuity in the presence of faults within the network. In this paper, we presented the new survivability method and discussed the capability of survivability in optical network. The survivability in WDM networks is implemented using protectionand restorationtechniques. Protection is a static mechanism to protect against failure, where the resource for both the primary and the backup light-paths are reserved prior to the data communication. Restoration on the other hand, is a dynamic mechanism where the backup light-path is not set up until the failure occurs. Survivability using these techniques is usually provided to handle single link failures in the core network.

scholarly journals Disaster-Resilient Optical Network Survivability: A Comprehensive Survey

Photonics ◽  
2018 ◽  
Vol 5 (4) ◽  
pp. 35 ◽  
Author(s):  
Muhammad Ashraf ◽  
Sevia Idrus ◽  
Farabi Iqbal ◽  
Rizwan Butt ◽  
Muhammad Faheem
Keyword(s):  
Optical Networks ◽  
Fault Tolerant ◽  
Optical Network ◽  
Network Survivability ◽  
Cascading Failures ◽  
Data Traffic ◽  
News Reports ◽  
Comprehensive Survey ◽  
Network Failures ◽  
Component Failures

Network survivability endeavors to ensure the uninterrupted provisioning of services by the network operators in case of a disaster event. Studies and news reports show that network failures caused by physical attacks and natural disasters have significant impacts on the optical networks. Such network failures may lead to a section of a network to cease to function, resulting in non-availability of services and may increase the congestion within the rest of the network. Therefore, fault tolerant and disaster-resilient optical networks have grasped the attention of the research community and have been a critical concern in network studies during the last decade. Several studies on protection and restoration techniques have been conducted to address the network component failures. This study reviews related previous research studies to critically discuss the issues regarding protection, restoration, cascading failures, disaster-based failures, and congestion-aware routing. We have also focused on the problem of simultaneous cascading failures (which may disturb the data traffic within a layer or disrupt the services at upper layers) along with their mitigating techniques, and disaster-aware network survivability. Since traffic floods and network congestion are pertinent problems, they have therefore been discussed in a separate section. In the end, we have highlighted some open issues in the disaster-resilient network survivability for research challenges and discussed them along with their possible solutions.

Optical Network Survivability

2011 ◽  
pp. 376-384
Author(s):  
N. S.C. Correia
Keyword(s):  
Wavelength Division Multiplexing ◽  
Optical Network ◽  
Network Survivability ◽  
Single Fiber ◽  
Fiber Failure ◽  
Wavelength Division ◽  
Optical Wdm ◽  
Service Interruption ◽  
Equipment Failures ◽  
Electrical Cables

The telecommunications world is evolving dramatically toward challenging scenarios where the fast and efficient transportation of information is becoming a key element in today’s society. Wavelength division multiplexing (WDM) technology has the potential to satisfy the ever-increasing bandwidth needs of the network users on a sustained basis (Mukherjee, 2000). Network operators must provide uninterrupted service to their customers, that is, network survivability must be guaranteed. This means that networks must be able to handle link or fiber cuts as well as equipment failures, fact that influences the design and operation of networks (Gerstel & Ramaswami, 2000). When using WDM, survivability becomes even more important because of the huge amount of traffic carried by a single fiber. A single fiber failure, even for few seconds, can be catastrophic (Maier, Pattavina, Patre, & Martinelli, 2002). This issue is actually very important since the optical WDM technology is now being deployed in the field. Network survivability is not just an academic subject. In real networks, failures happen quite frequently (fiber cuts, for example, are very common in terrestrial networks since they share other utility transport conduits such as gas or water pipes and electrical cables, and are considered the least reliable component (Gerstel et al., 2000; Maier et al., 2002). The prevention of service interruption, or the reduction of the service loss when failures occur, must now be an integral part of the network design and operations strategy or otherwise severe service losses can happen.

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