| 1. |
- Agelis, Sacki, et al.
(författare)
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Modular interconnection system for optical PCB and backplane communication
- 2002
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Ingår i: Parallel and Distributed Processing Symposium., Proceedings International, IPDPS 2002, Abstracts and CD-ROM. - Los Alamitos, Calif. : IEEE Press. - 0769515738 ; , s. 245-250
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Konferensbidrag (refereegranskat)abstract
- This paper presents a way of building modular systems with a powerful optical interconnection network. Each module, placed on a Printed Circuit Board (PCB), has a generic optical communication interface with a simple electronic router. Together with optical switching using micro-electromechanical system (MEMS) technology, packet switching over reconfigurable topologies is possible. The interconnection system gives the possibility to integrate electronics with optics without changing existing PCB technology. Great interest from industry is therefore expected and the cost advantages are several: reuse of module designs, module upgrades without changing the PCB, low-cost conventional PCB technology, etc. In the version described in this paper, the interconnection system has 48 bidirectional optical channels for intra-PCB communication on each board. For inter-PCB communication, a backplane with 192 bidirectional optical channels supports communication between twelve PCBs. With 2.5 Gbit/s per optical channel in each direction, the aggregated intra-PCB bit rate is 120 Gbit/s full duplex (on each PCB) while the aggregated inter-PCB bit rate is 480 Gbit/s full duplex. A case study shows the feasibility of the interconnection system in a parallel processing system for radar signal processing.
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| 2. |
- Agelis, Sacki, et al.
(författare)
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Optoelectronic router with a reconfigurable shuffle network based on micro-optoelectromechanical systems
- 2004
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Ingår i: Journal of Optical Networking. - Washington, USA : Optical Society of America. - 1536-5379. ; 4:1, s. 1-10
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Tidskriftsartikel (refereegranskat)abstract
- An optoelectronic router with a shuffle exchange network is presented and enhanced by the addition of micro-optoelectromechanical systems (MOEMS) in the network to add the ability to reconfigure the shuffle network. The MOEMS described here are fully connected any-to-any crossbar switches. The added reconfigurability provides the opportunity to adapt the system to different common application characteristics. Two representative application models are described: The first has symmetric properties, and the second has asymmetric properties. The router system is simulated with the specified applications and an analysis of the results is carried out. By use of MOEMS in the optical network, and thus reconfigurability, greater than 50% increased throughput performance and decreased average packet delay are obtained for the given application. Network congestion is avoided throughout the system if reconfigurability is used.
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| 3. |
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| 4. |
- Agelis, Sacki, et al.
(författare)
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System-Level Runtime Reconfigurablity - Optical Interconnection Networks for Switching Applications
- 2004
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Ingår i: Proceedings of the International Conference on Engineering of Reconfigurable Systems and Algorithms, ERSA'04. - Athens, USA : CSREA Press. - 1932415424 - 9781932415421 ; , s. 155-162
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Konferensbidrag (refereegranskat)abstract
- The performance requirements on data and telecommunication switches and routers are continuously increasing and it is evident that new ideas and architectures must come to light to satisfy these new demands. In this paper, a runtime reconfigurable modular design approach is presented, using state-of-the-art microoptical-electrical mechanical system (MOEMS) components. The paper introduces a novel field of reconfigurability, where reconfiguration is made on the system level instead of, e.g. fine-granularity reconfigurable logic. Different reconfigurable system solutions with support to adapt for asymmetric traffic patterns are proposed and compared to see how design choices affect flexibility, performance etc. The proposed solutions are characterized by their multistage networks with reconfigurable shuffle patterns.
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| 5. |
- Agelis, Sacki, et al.
(författare)
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Visualizing the Potential of Reconfigurable Shuffle-Patterns in Optoelectronic Routers by the Use of MOEMS
- 2004
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Ingår i: Proceedings of the IASTED International Conference Communication Systems and Networks. - Calgary, Canada : ACTA Press. - 0889864500 ; , s. 148-154
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Konferensbidrag (refereegranskat)abstract
- A reconfigurable high performance multistage router architecture is presented and simulated. The router backbone network is an optical shuffle exchange network that has the power of reconfigurability through the use of micro-optical-electrical mechanical systems (MOEMS). The router is subjected to different application classes. The application classes have different characteristics in terms of symmetric/asymmetric traffic properties. We compare our reconfigurable shuffle-pattern for all three application classes for the specified router architecture.
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| 6. |
- Bergenhem, Carl, et al.
(författare)
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Analysis problems in a spatial reuse ring network with a simple clocking strategy
- 2002
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- This technical report describes the problems associated with analysis of a spatial reuse ring network with a clock strategy also used in previously studied ring networks. The aim for the analysis was to find the worst case deterministic throughput. Some results are achieved and are presented. A worst case bound is found and this can be used for analysing feasibility of message connection sets. However, the bound is pessimistic and does not utilise the bandwidth reuse features of the network. This result does not meet the expectations that where foreseen because the medium access method inherently supports distributed global deadline scheduling. It is concluded that the current clock strategy of the network is the cause of the problems. It is also concluded that the analysis is complicated by the clocking strategy and that by introducing small changes in the network (will be presented in a separate paper), the analysis of the real-time performance will be much simpler. This will lead to a network with less pessimistic assumptions and hence better support for real-time traffic.
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| 7. |
- Bergenhem, Carl, et al.
(författare)
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Fibre-ribbon pipeline ring network with distributed global deadline scheduling and deterministic user services
- 2001
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Ingår i: International Conference on Parallel Processing Workshops, 2001. - Los Alamitos : IEEE Computer Society. - 0769512607 ; , s. 311-318
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Konferensbidrag (refereegranskat)abstract
- This paper introduces a novel, fair medium access protocol for a pipelined optical ring network. The protocol provides global deadline scheduling of packets. Requests for sending packets are sent by the nodes in the network to a master node. The master uses the deadline information in the requests to determine which packet is most urgent. Arbitration is done in two steps, the collection and distribution phases. The protocol is therefore called two-cycle medium access (TCMA). The network is best suited for LANs and SANs (system area networks) such as a high speed network in a cluster of computers or in an embedded parallel computer. Offered services in this network include best effort messages, guarantee seeking messages, real-time virtual channels, functions used in parallel processing. These are possible without additional higher level protocols. A simulation analysis of the network with the protocol is presented. Further analysis shows minimum slot length and fairness of the protocol.
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| 8. |
- Bergenhem, Carl, et al.
(författare)
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Fibre-ribbon ring network with inherent support for earliest deadline first message scheduling
- 2002
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Ingår i: Proceedings. - Los Alamitos, Calif. : IEEE. - 0769515738 ; , s. 157-163
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Konferensbidrag (refereegranskat)abstract
- This paper presents a network with earliest deadline first (EDF) scheduling on a per slot basis. The network is called CCR-EDF (Control Channel based Ring network with EDF scheduling). The topology is a pipelined unidirectional fibre-ribbon ring that supports several simultaneous transmissions in non-overlapping segments and with dedicated fibres for clock and arbitration. In each slot the node that has highest priority generates the clock. The clock hand over strategy together with the scheduling feature gives the network the functionality for earliest deadline scheduling of periodic messages belonging to logical real-time connections. Logical realtime connections may be added and removed during runtime, through admission control. Guaranteed realtime communication service is supported to the user. Other services include best effort traffic and special services for parallel and distributed processing such as barrier synchronisation and global reduction.
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| 9. |
- Bergenhem, Carl, et al.
(författare)
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Heterogeneous real-time services in high-performance system area networks - application demands and case study definitions
- 2002
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- To be able to verify the feasibility of high-performance networks, it is essential to evaluate them according to specific application requirements. At the same time, specifications of quite general, or understandable, application requirements are needed for the ability to make repeated analyses on different networks. Especially, heterogeneous real-time requirements must be defined to be able to analyze networks to be used in future applications. In this report, we introduce two application fields where system area networks (SANs) supporting heterogeneous real-time services are highly desirable if not required: radar signal processing and large IP routers. For each application field, a case study with heterogeneous real-time communication requirements is defined. No case studies are presented in this report. Instead, they are defined for later evaluations to determine how suitable networks are for applications with heterogeneous real-time communication requirements.
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| 10. |
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