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Crossbar switches are fundamental building blocks of digital networks such as the Internet. An input-queued (IQ) crossbar switch includes a set of queues at the input side of the switch, combined with an unbuffered switching matrix with N2 crosspoints. A crosspoint-queued (XQ) crossbar switch contains a FIFO queue at each of the NxN crosspoints of the switching matrix. Switches with combined IQs and...
Telecommunications carriers are under great economic pressure to keep their core networks cost effective. To address that, they need to keep reducing the cost-per-bit in the core IP routers and switches as well as the optical transport network which interconnects them. We will discuss the resulting desires for the transport technologies and temper those with capacity crunch issues. We will then explore...
Traffic grooming can be used in IP-over-WDM networks to efficiently utilize the bandwidth of wavelength channels. However, providing grooming capability to network nodes increases the network cost that operators must sustain when compared with a non-grooming network. In this paper a minimization cost heuristic approach is presented that seeks for the cheapest IP-over-WDM grooming network. This approach...
In a very high-speed network environment such as gigabit Ethernet network, firewalls that have to inspect and filter all flowing packets are reaching their limits. A firewall running on a single machine is potential bottleneck and cannot scale over certain thresholds, even if it has particular hardware built-in. Hence, parallel system appears as an alternative approach under this circumstance. This...
This paper will present the ULtra fast Internet Satellite Switching (ULISS) demonstrator capabilities developed by the telecom research department of Thales Alenia Space France and the project partners. The goal of the ULISS project is to demonstrate the feasibility of a promising switching solution called Radio Burst Switching. This concept proposes to upgrade a Digital Transparent Processor technology...
This paper focuses on the problem of quality of service (QoS) provisioning in optical burst switching (OBS) networks. OBS is a promising photonic network technology aiming at efficient transport of IP traffic by means of statistical multiplexing. The lack of optical memories, however, makes this operation quite complicated. Problems such as unfairness in access to the shared transmission resources,...
The IP layer of obstacles, such as routers optical-transmission malfunction in the hierarchy can not handle. These types of obstacles that need and packet-level rerouting, if packet-level rerouting long time backup LSP or tunneling path through the ability to automatically switchover needs. Disability for a certain amount of resilience backup (protection), or to require extra capacity. There is no...
Dolphin's DX interconnect, comprising of PCI Express based hardware and accompanying software is an industry first solution for seamlessly integrating IO and clustering capabilities onto an enhanced PCI Express interconnect. This one of a kind solution eliminates the need for two distinct interconnects - one dedicated to IO and the other to clustering.
Carrier networks are gradually adopting a network model that consists of MPLS-capable routers and OXCs interconnected by high bandwidth WDM links for transporting IP and Ethernet traffic. A control plane can be used to deliver dynamic circuit provisioning in the transport layer, as well as bandwidth provisioning and traffic engineering in higher layers. Globalization drives the quest for end-to-end...
Several technologies have been studied for packet transport but none of them alone can address all packet transport requirements. So a technology mix should be employed to achieve packet transport. Most cost items in the NG-SDH and agnostic approaches are the traffic mapping process on the line cards. Agnostic switch to support high speed TDM has not been proven. Hybrid architecture is the most reliable...
MPLS is the industrypsilas choice for integrating diverse services over the high speed optical network. In case of failures in the physical infrastructure, protection schemes help route the traffic away from the failure site for minimizing the effect on services. In this paper, we present an overview of the latest protection schemes as proposed for MPLS domains. We identify the important issues and...
This paper evaluates different architectures for multilayer IP transport networks. The evaluation is based on an exemplary network dimensioning of a reference IP backbone network topology, connecting 63 points of presence (PoPs) in Germany. The network dimensioning results are used for a techno-economic analysis of the different network architectures, taking into account hypothetical but realistic...
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