Because of the explosive growth of network traffic, backbone networks move towards all-optical-packet-switching networks. However, optical buffers implemented by Fibre Delay Lines (FDLs) have a volatile nature because of signal loss and noise accumulation problems from optical components of the FDL buffer. Because of this, scheduling packets becomes more difficult in the FDL buffer than in the RAM buffer, and requires additional design considerations for reducing packet loss. Therefore, we propose a packet prioritisation algorithm for all-optical-packet-switching networks with FDL buffers. The point of the packet prioritisation algorithm is to rank packets in optimal balance between latency and residual distance. We optimise a relative-distance factor to minimise packet loss probability. Our simulation results show how various network parameters affect the optimal relative-latency factor.
- Inderscience Publishers
- Performance analysis of a packet prioritisation algorithm for ...
Designing that unique Ferrari sound using NVH Simulation
Our NVH simulation technology enabled Ferrari to perform virtual evaluations of alternative design decisions in an interactive, free-driving scenario. Ferraris are distinguished by a unique sound that is as carefully tuned as a piece of music. Creating this characteristic sound authentically and yet keeping it within legal limits requires careful component design and selection. Our NVH simulation technology enabled Ferrari to perform virtual evaluations of alternative design decisions in an interactive, free-drivi...
Two Modified IEC 60318-4 Ear Simulators for Extended Dynamic Range
The international standard IEC 60318-4 specifies an occluded ear simulator, often referred to as a 711-coupler, for testing headphones, earphones, hearing protectors, hearing aids etc. The standard specifies a specific microphone type which limits the dynamic range of the coupler both in the low range and in the high. To overcome these limitations, G.R.A.S. has developed two modified versions of the standard ear simulator: A high-sensitive, low-noise version that extends the lower dynamic range below the threshold...
Romax Consultancy Services Provide Reliability Solutions for European Rail OEM - Case Study
CAF MiiRA is a leading company in the design, manufacture and maintenance of railway wheelsets and their components. Currently, CAF MiiRA is the only manufacturer of wheels and axles capable of delivering the wheelset with a complete design: from the wheels, axles, axle boxes, and gearboxes. Mikel Oyarbide, Gearboxes Projects Engineer at CAF MiiRA, explains: “CAF offers comprehensive global rail solutions which, in addition to the supply of trains, include viability studies, civil work, electrification,...
Engineering Innovation into Driveline Design
Introduction: thinking differentlyWhat is innovation? How can you harness innovation in practical ways to support your business goals? In the driveline industry and for engineering in general, “innovation” is often synonymous with the use of new or novel technologies/methods to achieve design and development goals - and ultimately deliver a higher quality product - in faster, more efficient and lower cost ways. At Romax, we call such an approach Right First Time. It often involves gaining the ability...
How to test phones for noisy environments?
Whether walking down a noisy street or talking on speakerphone, telephone users expect clear voice transmission. Sophisticated signal processing enhances human speech above background noise, but as there are different methods to test this capability, manufacturers cannot always be sure of the best one to use on their products. To identify the best approach, Brüel & Kjær carried out an investigation contrasting five methods for the reproduction of background noise, including ETSI EG 202 396-1,...