Service assurance in modern telecommunications networks

Falconer, W.E.

doi:10.1109/35.56226

Cited by 27 publications

(18 citation statements)

References 7 publications

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“…Yet all these services are multiplexed and transported on a relatively sparse backbone of high-capacity fiber-optic transmission links. The impact of failure can be drastic [1], [2]. There are currently two main approaches to provide a "selfhealing" capability for these networks.…”

Section: Introductionmentioning

confidence: 99%

High availability path design in ring-based optical networks

Grover¹

1999

IEEE/ACM Trans. Networking

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This work develops mathematical models for path availability and provisioning resources required in various strategies for realizing high availability service paths in a transport environment of bidirectional line-switched rings or shared protection optical (wavelength division multiplexing) rings. The work originated in response to user requests for SONET service paths with unavailabilities under 30 s/year. A number of schemes for redundant routing and ring interconnection are considered as options to meet such a demanding target in the most economic way. An analytical framework for comparison of various provisioning schemes allows a "cost effectiveness" assessment of four highperformance alternatives, in terms of total resource investment and the corresponding service unavailability relative to a singlefed path construction. The logical models of cost and availability can be used in a variety of SONET or optical-ring transport planning studies or perhaps in future automated provisioning tools. An important finding is that while the availability benefit of dual-ring interconnection is high in metro-ring networks, the availability of paths through long-haul ring networks may be relatively poor due to lower limits from two-failure intra-ring combinations.

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Section: Introductionmentioning

confidence: 99%

High availability path design in ring-based optical networks

Grover¹

1999

IEEE/ACM Trans. Networking

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“…The cross-connect maps are consequently altered, and traffic is rerouted over alternate paths. A centralised restoration system based on these principles [8] has been developed by AT&T. Although this approach allows the spare capacity to be utilised optimally, centralised restoration is considered to be too slow to meet the performance demands of broadband networks. Fast recovery from failure is possible by devolving the responsibility of restoration to the network nodes, whereby cross-connect systems exchange messages in a distributed fashion.…”

Section: Approaches To Restorationmentioning

confidence: 99%

The Design of Survivable ATM Networks

Veitch

Smith

Hawker

1995

Performance Modelling and Evaluation of ATM Networks

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It is essential that broadband communication networks are survivable. Failure of links or nodes could have disastrous consequences in a very high speed network carrying large volumes of data, for the user, for the service provider and for the network operator. Hence, restoration mechanisms are required which automatically reconfigure routes to avoid the location of a failure. In this work, a backbone ATM mesh network is considered whereby Virtual Paths are cross-connected at special ATM switching nodes. Initially, the means of performing restoration given a certain spare capacity distribution which does not guarantee comprehensive recovery, is examined. This encompasses the preparation required in advance of a failure, and the actual execution of restoration. A network design scheme is subsequently described which enables provisioning of spare capacity for complete restoration from particular failures: the expected Virtual Path traffic demands and routing must be known a priori.

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“…In order to provide uninterrupted service to the affected virtual circuits, the primary node must restore the virtual circuit within approximately 2 seconds for a voice connection and within 10 seconds for a data connection [1]. Several issues in the traffic restoration process at the primary node can be critical to the network performance after restoration, namely: 1) the criterion for ordering the virtual circuits that need to be restored (e.g., highest bandwidth calls first); 2) the call admission algorithm (should it be modified to admit more or less connections?…”

Section: An Analysis Of the Effect Of Timing Of Reroutingmentioning

confidence: 99%

“…The critical importance of network reliability/survivability is discussed in detail in [l]- [3]. For example, in [1], the author notes that the loss of revenue in high exposure industries due to a network outage may exceed six million dollars in unrecoverable revenue per hour of downtime.…”

Section: Introductionmentioning

confidence: 99%

“…A network failure, such as the loss of a link or a node, can occur due to a variety of reasons causing service disruptions ranging in length from seconds to weeks. Typical events that cause failures are accidental cable cuts, hardware malfunctions, software errors, natural disasters (e.g.,fire), and human error (e.g., incorrect repair) [1], [3]. Since many of the causes of failures are outside the control of the network providers, there has been increasing interest in the design of survivable networks [l]- [3].…”

Section: Introductionmentioning

confidence: 99%

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An Analysis of the Timing of Traffic Restoration in Wide Area Communication Networks

Balakrishnan

Tipper

Hammond

1994

The Fundamental Role of Teletraffic in the Evolution of Telecommunications Networks

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In this paper, we study the timing of virtual circuit traffic restoration after a link failure in wide area communication networks. The commonly used scheme of almost simultaneously rerouting the virtual circuits is compared with a scheme wherein the rerouting of the virtual circuits is staggered, thus ensuring that they do not congest the network node at the same time. We determine which approach is better by minimizing the time taken by a network node to reach steady state after the traffic restoration.

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Service assurance in modern telecommunications networks

Cited by 27 publications

References 7 publications

High availability path design in ring-based optical networks

High availability path design in ring-based optical networks

The Design of Survivable ATM Networks

An Analysis of the Timing of Traffic Restoration in Wide Area Communication Networks

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