Ahmet A. Akyamac

Fast approximate dimensioning and performance analysis of mesh optical networks

This paper presents a collection of approximation formulas that allow a network planner to quickly estimate the size of a mesh optical network with limited inputs. In particular, it provides a set of equations that relate number of sites, average fiber connectivity, demand load and capacity for various mesh protection architectures. These results can be used to easily and quickly estimate the amount of traffic that can be carried over a given network, or, conversely, given the traffic to be supported, to assess the characteristics of the topology required (in terms of number of nodes, connectivity). Finally, this analysis can be used to estimate the restoration performance that can be expected without resorting to extensive simulation studies.

Pre-emptive reprovisioning in mesh optical networks

Pre-emptive reprovisioning is a method to perform reprovisioning of a backup path in advance of a second failure, to reduce the time to recover service from seconds (reprovisioning) to milliseconds (restoration). We evaluate the tradeoff between benefits and operational complexity.

Limiting sharing on protection channels in mesh optical networks

We examine two approaches in shared mesh restoration to limiting the number of lightpaths protected by a shared-channel. The goal is to prevent shared-channels from protecting a large number of lightpaths without significantly increasing protection capacity.

MPLS Network Requirements and Design for Carriers: Wireline and Wireless Case Studies

MPLS (multi-protocol label switching) has become the choice of packet transport technology to meet multiple service requirements in the next generation network. More and more service providers, both wireline and wireless, are starting to deploy MPLS as the common packet backbone. In this paper, we examine the key requirements for multi-class MPLS network design and how these requirements can be modeled and achieved with various MPLS configuration and design options. We present two case studies: one for a wireline MPLS TE design and another for a mobile greenfield MPLS design and SLA analysis. In these case studies, we analyze alternative design scenarios based on QoS and protection options, and consequent performance in terms of network efficiency, end-to-end delay/jitter, time of convergence, and service availability