4,044 results on '"Circuit switching"'
Search Results
2. DEVELOPMENT OF A MATHEMATICAL MODEL FOR ASSESSING THE QUALITY OF SERVICE ON A PACKET SWITCHING SUBNET.
- Author
-
Mukasheva, Roza, Rakhmetullina, Zhenisgul, Uvaliyeva, Indira, Mukhamedova, Raushan, and Amenova, Farida
- Subjects
COMPUTER network traffic ,SYSTEM failures ,MATHEMATICAL models ,NETWORK performance ,PROBLEM solving - Abstract
Currently, data traffic is growing rapidly, and ensuring optimal network performance and effective data flow management have become the most important tasks. In this context, the quality of network service plays a crucial role in achieving these goals. This article suggests an approach to solving the problem of efficient service in ISDN. Namely, optimization of resource distribution between channel switching and packet switching subnets in ISDN to calculate optimal quality of service characteristics. In the process of ISDN design analysis, an optimization problem is compiled, where the evaluation of the packet-switched subnet service is used as an objective function, and the evaluation of the circuit-switched subnet service is used as one of the constraints for this task. To calculate the main characteristics of a packetswitched subnet, the subnet is considered as a service system with a delay. During the study, the methods of optimal movement of the generalized channel boundary between the subnets of channel switching and packet switching were identified, depending on the data parameters and the state of the integrated network, which made it possible to develop an optimal mathematical model of optimal control of the generalized boundary. To calculate the bandwidth for channel switching and packet switching subnets, an algorithm has been compiled to implement the resulting model and a program in C++ has been compiled. The study of the generalized boundary and the dynamic redistribution of bandwidth between subnets represents a new approach to network optimization. The results are based on the use of the classical Erlang formula for systems with service failures and on load distribution plans, which makes it possible to effectively manage the maintenance process in the network. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
3. A Wireless Power Transfer System with Switching Circuit of Power Grid and Solar Energy
- Author
-
Song, Ze, Zhang, Xin, Zhang, Xiu, Xing, Ruiqing, Wang, Lei, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zhang, Junjie James, Series Editor, Wang, Wei, editor, Liu, Xin, editor, Na, Zhenyu, editor, Jia, Min, editor, and Zhang, Baoju, editor
- Published
- 2020
- Full Text
- View/download PDF
4. Time to Rethink the Power of Packet Switching
- Author
-
Manfred Sneps-Sneppe and Dmitry Namiot
- Subjects
packet switching ,circuit switching ,signaling ,Telecommunication ,TK5101-6720 - Abstract
Communication specialists all around the world are facing the same problem: shifting from circuit switching (CS) to packet switching (PS). Communication service providers are favoring “All-over-IP” technologies hoping to boost their profits by providing multimedia services. The main stakeholder in this field of the paradigm shift is the industry itself: packet switching hardware manufacturers are going to earn billions of dollars and thus pay engineers and journalists many millions for the promotion of the new paradigm. However, this drive for profit is tempered by life itself. This article is devoted to the discussion of the telecommunications development strategy. We will provide examples to illustrate the difficulties that complicate the transition from CS to PS and the move to hybrid CS+PS solutions. We are considering three areas: (1) network-on-a-chip (NoC), (2) the telecom strategy: how to build the core of the network, (3) the transition of the U.S. Defense Information System Network from SS7 signaling to IP protocol.
- Published
- 2018
5. Green Symbiotic Cloud Communications—Theory and Experimentation
- Author
-
Mustafa, H. D., Merchant, Shabbir N., Desai, Uday B., Baveja, Brij Mohan, Mustafa, H.D, Merchant, Shabbir N., Desai, Uday B., and Baveja, Brij Mohan
- Published
- 2017
- Full Text
- View/download PDF
6. Experimental research on configuration optimization of a frost-free refrigerator-freezer with the parallel circuit cycle.
- Author
-
Yan, Gang, Liu, Guoqiang, Zhou, Min, and Yu, Jianlin
- Subjects
- *
STRUCTURAL optimization , *PARALLEL electric circuits , *REFRIGERANTS , *SWITCHING circuits , *ENERGY consumption - Abstract
• Much refrigerant in the F-evaporator causes the starvation of R-evaporator at RC. • Liquefied refrigerant held-up in the bottom of F-evaporator affect FC performance. • The multi-parameters optimization experimental methods are performed. • R-cabinet temperature drop rate decreased with the increase of ambient temperature. • F-cabinet temperature drop rate was almost unaffected by the ambient temperature. This paper presents an experimental research on configuration optimization of a frost-free refrigerator-freezer with the parallel circuit cycle based on the analysis of circuit switching characteristics. Through combination optimization of R-fan voltage, F-fan voltage, R-capillary tube flow capacity, refrigerant charge, structure of suction pipe, F-compressor speed and R-compressor speed, the system could save 9.27% energy consumption compared with the initial condition. The experimental results also showed that the larger the R-capillary tube flow capacity, the larger the flow rate of the RC, resulting in the quickly temperature drop in R-cabinet and slowly temperature drop in R-cabinet based on "R-cabinet temperature priority" control strategy. Additionally, the R-cabinet temperature drop rate decreased with the increase of ambient temperature but the F-cabinet temperature drop rate was almost unaffected by the ambient temperature. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
7. Network optimization for unified packet and circuit switched networks.
- Author
-
Yin, Ping, Diamond, Steven, Lin, Bill, and Boyd, Stephen
- Abstract
Internet traffic continues to grow relentlessly, driven largely by increasingly high resolution video content. Although studies have shown that the majority of packets processed by Internet routers are pass-through traffic, they nonetheless have to be queued and routed at every hop in current networks, which unnecessarily adds substantial delays and processing costs. Such pass-through traffic can be better circuit-switched through the underlying optical transport network by means of pre-established circuits, which is possible in a unified packet and circuit switched network. In this paper, we propose a novel convex optimization framework based on a new destination-based multicommodity flow formulation for the allocation of circuits in such unified networks. In particular, we consider two deployment settings, one based on real-time traffic monitoring, and the other relying upon history-based traffic predictions. In both cases, we formulate global network optimization objectives as concave functions that capture the fair sharing of network capacity among competing traffic flows. The convexity of our problem formulations ensures globally optimal solutions. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
8. Communication Architecture
- Author
-
Tatas, Konstantinos, Siozios, Kostas, Soudris, Dimitrios, Jantsch, Axel, Tatas, Konstantinos, Siozios, Kostas, Soudris, Dimitrios, and Jantsch, Axel
- Published
- 2014
- Full Text
- View/download PDF
9. Modeling the effect of wavelength selective switch latency on optical flow switching performance.
- Author
-
Shakeri, Ali, Wang, Xue, Razo, Miguel, Alabarce, Miquel Garrich, Oki, Eiji, Yamanaka, Naoaki, and Fumagalli, Andrea
- Abstract
Optical networks are well suited to enable massive data exchanges between datacenters. Elephant data flows can be routed over custom provisioned and dedicated lightpaths (optical flows) while other (mice) flows, which are routed by electronic switches, are unaffected. In some solutions, wavelength-selective switch (WSS) devices are employed in the optical nodes to physically and individually route each lightpath toward its destination. WSS devices take time to be switched and consequently delay the lightpath setup completion time. In this paper, the authors present three approximate Markov chain models to account for three different WSS service policies. These models estimate the expected lightpath setup and teardown time across an optical node that makes use of WSS devices. The first and more conventional policy (model) assumes that each setup and teardown request is handled individually, while the other two policies (models) assume that groups of setup and/or teardown requests are handled together by the WSS. The models' estimates are compared against the results obtained from a computer-based simulator, where both analytical models and simulator account for experimentally measured WSS response times. The simulator is also used to investigate the end-to-end lightpath setup time across an arbitrary mesh network. Results obtained from the models and simulator show that the group-based service policies outperform the conventional policy at high loads. The group-based policies are especially useful in the presence of lightpaths that are frequently set up and have relatively short holding time (i.e., short duration of elephant-optical flows). [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
10. DACON
- Author
-
Fulong Yan, Xiaotao Guo, Nicola Calabretta, Bitao Pan, Xuwei Xue, Georgios Exarchakos, Electro-Optical Communication, Advanced Network Management and Control, Center for Wireless Technology Eindhoven, and EAISI High Tech Systems
- Subjects
Circuit switching ,Packet switching ,Computer Networks and Communications ,business.industry ,Computer science ,Packet loss ,Node (networking) ,Embedded system ,Scalability ,Control reconfiguration ,Data center ,Linux kernel ,business - Abstract
To solve the issues of low resource utilization and performance bottleneck in current server-centric data center networks (DCNs), we propose and experimentally demonstrate a disaggregated application-centric optical network (DACON) for data center infrastructures based on hybrid optical switches. DACON achieves flexible provision and dynamic reconfiguration of hardware nodes exploiting the softwared-define networking (SDN) orchestration plane. A four-node SDN-enabled disaggregated prototype is implemented with a field-programmable-gate-array-based controller of hardware nodes and nanosecond optical switches, performing a minimal node-to-node network latency of 378.6 ns and zero packet loss. Based on the unmodified Linux kernel and two different applications (distributed computing and a Memcached database), the application runtime of the disaggregated prototype is investigated and compared with the server-centric architecture. Experimental results show that the disaggregated prototype performs better with Memcached database applications, achieving a 1.46 × faster runtime than the server-centric network at a memory node access ratio of 0.9. Based on the customized control plane orchestrator and dynamic resource reallocation, the node-to-node latency is reduced by 21% when CPU nodes access memory nodes. The scalability of DACON is then numerically assessed based on experimentally measured parameters. Results show that the intra-rack node-to-node latency is less than 404.8 ns with a 6144-node network and memory node access ratio of 0.9. Finally, the cost and power consumption are also studied and compared with current DCN architectures. Results indicate DACON saves 13.4% of the cost of an interconnect network compared with current disaggregated architecture and consumes up to 31.1% less power with respect to server-centric DCN architectures.
- Published
- 2022
11. Birkhoff’s Decomposition Revisited: Sparse Scheduling for High-Speed Circuit Switches
- Author
-
Victor Valls, George Iosifidis, and Leandros Tassiulas
- Subjects
FOS: Computer and information sciences ,Doubly stochastic matrix ,Computer Networks and Communications ,Computer science ,Heuristic (computer science) ,02 engineering and technology ,Permutation matrix ,Topology ,Scheduling algorithms ,Matrix decomposition ,Computer Science - Networking and Internet Architecture ,Matrix (mathematics) ,machine learning algorithms ,FOS: Mathematics ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,Mathematics - Optimization and Control ,Birkhoff decomposition ,Sparse matrix ,Networking and Internet Architecture (cs.NI) ,Circuit switching ,Approximation algorithm ,020206 networking & telecommunications ,Computer Science Applications ,switches ,Optimization and Control (math.OC) ,Software - Abstract
Data centers are increasingly using high-speed circuit switches to cope with the growing demand and reduce operational costs. One of the fundamental tasks of circuit switches is to compute a sparse collection of switching configurations to support a traffic demand matrix. Such a problem has been addressed in the literature with variations of the approach proposed by Birkhoff in 1946 to decompose a doubly stochastic matrix exactly. However, the existing methods are heuristic and do not have theoretical guarantees on how well a collection of switching configurations (i.e., permutations) can approximate a traffic matrix (i.e., a scaled doubly stochastic matrix). In this paper, we revisit Birkhoff’s approach and make three contributions. First, we establish the first theoretical bound on the sparsity of Birkhoff’s algorithm (i.e., the number of switching configurations necessary to approximate a traffic matrix). In particular, we show that by using a subset of the admissible permutation matrices, Birkhoff’s algorithm obtains an ǫ-approximate decomposition with at most O(log(1/ǫ)) permutations. Second, we propose a new algorithm, Birkhoff+, which combines the wealth of Frank-Wolfe with Birkhoff’s approach to obtain sparse decompositions in a fast manner. And third, we evaluate the performance of the proposed algorithm numerically and study how this affects the performance of a circuit switch. Our results show that Birkhoff+ is superior to previous algorithms in terms of throughput, running time, and number of switching configurations.
- Published
- 2021
12. Improving the Performance of Circuit-Switched Interconnection Network for a Multi-FPGA System
- Author
-
Michihiro Koibuchi, Yao Hu, Kohei Ito, Kensuke Iizuka, Hideharu Amano, and Kazuei Hironaka
- Subjects
Interconnection ,Circuit switching ,Artificial Intelligence ,Hardware and Architecture ,Computer science ,business.industry ,Computer Vision and Pattern Recognition ,Electrical and Electronic Engineering ,business ,Field-programmable gate array ,Software ,Computer hardware - Published
- 2021
13. Communications Technologies
- Author
-
Cowley, John and Cowley, John
- Published
- 2013
- Full Text
- View/download PDF
14. Hierarchical and Multiple Switching NoC with Floorplan Based Adaptability
- Author
-
Matos, Debora, Reinbrecht, Cezar, Kreutz, Marcio, Palermo, Gianluca, Carro, Luigi, Susin, Altamiro, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Brisk, Philip, editor, de Figueiredo Coutinho, José Gabriel, editor, and Diniz, Pedro C., editor
- Published
- 2013
- Full Text
- View/download PDF
15. Introduction to Networks
- Author
-
Robertazzi, Thomas and Robertazzi, Thomas
- Published
- 2012
- Full Text
- View/download PDF
16. Scheduling Virtual Network Reconfigurations in Parallel in Hybrid Optical/Electrical Datacenter Networks
- Author
-
Xiaoqin Pan, Hao Yang, Shaofei Tang, Sicheng Zhao, and Zuqing Zhu
- Subjects
Circuit switching ,Schedule ,Dynamic network analysis ,Packet switching ,business.industry ,Computer science ,Network service ,Control reconfiguration ,business ,Network topology ,Virtual network ,Atomic and Molecular Physics, and Optics ,Computer network - Abstract
A hybrid optical/electrical datacenter network (HOE-DCN) integrates the benefits of electrical packet switching (EPS) and optical circuit switching (OCS) for better architectural scalability. Meanwhile, as each network service usually involves multiple virtual machines (VMs) that form a virtual network (VNT), how to reconfigure the VNTs in an HOE-DCN to adapt to the dynamic network environment becomes an interesting and important problem to tackle. In this work, we optimize the procedure of VNT reconfigurations that remap VNTs to given virtual network embedding (VNE) schemes, i.e. , scheduling the required VM migrations and optical cross-connect (OXC) reconfiguration properly such that the overall VNT reconfiguration latency can be minimized. We first assume that all the VM migrations should be scheduled before the OXC reconfiguration to minimize service interruptions, and formulate a mixed integer linear programming (MILP) model to solve the scheduling problem exactly. Then, with the same assumption, we propose a time-efficient heuristic to schedule parallel VM migrations in batches such that the bandwidth competition can be significantly relieved. Finally, we divide the OXC reconfiguration into several progressive steps, and design a joint scheduling algorithm to arrange VM migrations together with the OXC reconfiguration steps.
- Published
- 2021
17. Stationary joint distribution of a discrete-time group-arrival and batch-size-dependent service queue with single and multiple vacation
- Author
-
S. Pradhan and N. Nandy
- Subjects
Statistics and Probability ,Queueing theory ,Circuit switching ,business.industry ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,law.invention ,Packet switching ,Discrete time and continuous time ,Joint probability distribution ,law ,Internet Protocol ,Broadband Integrated Services Digital Network ,business ,Queue ,Mathematics ,Computer network - Abstract
Discrete-time queueing systems have widespread applications in packet switching networks, internet protocol, Broadband Integrated Services Digital Network (B-ISDN), circuit switched time-division m...
- Published
- 2021
18. Fast Data Delivery for Many-Core Processors.
- Author
-
Bakhshalipour, Mohammad, Lotfi-Kamran, Pejman, Mazloumi, Abbas, Samandi, Farid, Naderan-Tahan, Mahmood, Modarressi, Mehdi, and Sarbazi-Azad, Hamid
- Subjects
- *
WORKLOAD of computers , *MACRO processors , *ELECTRIC circuits , *ELECTRIC breakdown , *CLIENT/SERVER computing - Abstract
Server workloads operate on large volumes of data. As a result, processors executing these workloads encounter frequent L1-D misses. In a many-core processor, an L1-D miss causes a request packet to be sent to an LLC slice and a response packet to be sent back to the L1-D, which results in high overhead. While prior work targeted response packets, this work focuses on accelerating the request packets. Unlike aggressive OoO cores, simpler cores used in many-core processors cannot hide the latency of L1-D request packets. We observe that LLC slices that serve L1-D misses are strongly temporally correlated. Taking advantage of this observation, we design a simple and accurate predictor. Upon the occurrence of an L1-D miss, the predictor identifies the LLC slice that will serve the next L1-D miss and a circuit will be set up for the upcoming miss request to accelerate its transmission. When the upcoming miss occurs, the resulting request can use the already established circuit for transmission to the LLC slice. We show that our proposal outperforms data prefetching mechanisms in a many-core processor due to (1) higher prediction accuracy and (2) not wasting valuable off-chip bandwidth, while requiring significantly less overhead. Using full-system simulation, we show that our proposal accelerates serving data misses by 22 percent and leads to 10 percent performance improvement over the state-of-the-art network-on-chip. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
19. A Large-Scale Optical Circuit Switch Using Fast Wavelength-Tunable and Bandwidth-Variable Filters.
- Author
-
Ganbold, Mungun-Erdene, Nagai, Hiroki, Mori, Yojiro, Suzuki, Keijiro, Matsuura, Hiroyuki, Tanizawa, Ken, Ikeda, Kazuhiro, Namiki, Shu, Kawashima, Hitoshi, and Sato, Ken-ichi
- Abstract
We present a large-scale optical circuit switch architecture using wavelength-tunable and bandwidth-variable silicon photonic filters. The attainable switch port count is quantitatively evaluated through extensive computer simulations. The requirements for constructing a 1, $024\times1$ ,024 optical circuit switch are analyzed on 10-, 28-, and 56-Gb/s signals. The simulation results are verified through transmission experiments. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
20. Efficient Timing Channel Protection for Hybrid (Packet/Circuit-Switched) Network-on-Chip.
- Author
-
Biswas, Arnab Kumar
- Subjects
- *
NETWORKS on a chip , *EMBEDDED computer systems , *SWITCHING circuits , *MULTIPROCESSORS , *CENTRAL processing units - Abstract
Continuous development of Network-on-Chip (NoC) enables different types of applications to run efficiently in a Multiprocessor System-on-Chip (MP-SoC). Guaranteed service (GS) can be provided by circuit switching NoC and Best effort service (BES) can be provided by packet switching NoC. A hybrid NoC containing both packet and circuit switching, can provide both types of services to these different applications. But these different applications can be of different security levels and one application can interfere another application’s timing characteristics during network transmission. Using this interference, a malicious application can extract secret information from higher security level flows (timing side channel) or two applications can communicate covertly violating the system’s security policy (covert timing channel). We propose different mechanisms to protect hybrid routers from timing channel attacks. For design space exploration, we propose three timing channel secure hybrid routers viz. Separate Hybrid (SH), Combined with Separate interface Hybrid (CSH), and Combined Hybrid (CH) routers. Simulation results show that all three routers are secure from timing channel when compared to a conventional hybrid router. Synthesis results show that the area increments compared to a conventional hybrid router are only 7.63, 11.8, and 19.69 percent for SH, CSH, and CH routers respectively. Thus simulation and synthesis results prove the effectiveness of our proposed mechanisms with acceptable area overheads. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
21. QoS in Networks-on-Chip – Beyond Priority and Circuit Switching Techniques
- Author
-
Mello, Aline, Calazans, Ney, and Moraes, Fernando
- Published
- 2009
- Full Text
- View/download PDF
22. A Novel Non-exclusive Dual-Mode Architecture for MPSoCs-Oriented Network on Chip Designs
- Author
-
Palumbo, Francesca, Secchi, Simone, Pani, Danilo, Raffo, Luigi, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Bereković, Mladen, editor, Dimopoulos, Nikitas, editor, and Wong, Stephan, editor
- Published
- 2008
- Full Text
- View/download PDF
23. Trade-offs in the Design of a Router with Both Guaranteed and Best-Effort Services for Networks on Chip
- Author
-
Rijpkema, E., Goossens, K. G. W., Rădulescu, A., Dielissen, J., van Meerbergen, J., Wielage, P., Waterlander, E., Lauwereins, Rudy, editor, and Madsen, Jan, editor
- Published
- 2008
- Full Text
- View/download PDF
24. Modelling and Simulation Analysis of Routing Algorithms in Multichannel Optical Communication Networks
- Author
-
K. Angelov and S. Sadinov
- Subjects
Circuit switching ,Computer science ,business.industry ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,Connection (vector bundle) ,Optical communication ,Physics::Optics ,Blocking (statistics) ,Multiplexing ,Set (abstract data type) ,Path (graph theory) ,Broadband ,business ,Computer network - Abstract
In this paper, it is considered the broadband backbone optical networks with wavelength routing and circuit switching used to build long-range wide area networks. In this type of network, if there is an available and acknowledged connection request, it is necessary to determine the optimal path between the optical communication nodes in the network. This also requires the assignment of an optimal set of wavelengths along the selected route between these nodes. This paper takes into account the multichannel optical communication networks with spectral multiplexing. Four different routing algorithms are modeled and analyzed for which their weight functions are determined to take into account various factors, such as the total distance of the individual routes, the total number of available wavelengths for a given route and how many of them are available for use. It is studied and compared the performance of the proposed algorithms in a multichannel optical network in terms of blocking probability.
- Published
- 2021
25. Communications Technologies
- Author
-
Cowley, John
- Published
- 2007
- Full Text
- View/download PDF
26. Online Communication
- Author
-
Bobda, Christophe and Bobda, Christophe, editor
- Published
- 2007
- Full Text
- View/download PDF
27. Choice of Inner Switching Mechanisms in Terabit Router
- Author
-
Gu, Huaxi, Qiu, Zhiliang, Liu, Zengji, Kang, Guochang, Wang, Kun, Hong, Feng, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Lorenz, Pascal, editor, and Dini, Petre, editor
- Published
- 2005
- Full Text
- View/download PDF
28. Introduction
- Author
-
Kabaciński, Wojciech
- Published
- 2005
- Full Text
- View/download PDF
29. Minimizing Coflow Completion Time in Optical Circuit Switched Networks
- Author
-
Tong Zhang, Jiakun Bao, Ran Shu, Fengyuan Ren, and Wenxue Cheng
- Subjects
020203 distributed computing ,Circuit switching ,Computer science ,Control reconfiguration ,Approximation algorithm ,Throughput ,Optical circuit switching ,02 engineering and technology ,Optical switch ,Scheduling (computing) ,Computational Theory and Mathematics ,Computer engineering ,Hardware and Architecture ,Signal Processing ,0202 electrical engineering, electronic engineering, information engineering ,Completion time - Abstract
Nowadays, optical circuit switching is becoming an increasingly favored technology in scaling data center networks for its definitive advantages in data rate, power consumption, and device cost. Concurrently, reducing coflow completion time (CCT) is of great significance for improving application-level performance. However, minimizing CCT in circuit switched networks is totally different from that in traditional packet switched networks due to port constraints and circuit reconfiguration delays. To address this issue, this article proposes Grouped Optimization-based Scheduling (GOS), a CCT minimization algorithm for circuit switched networks integrating circuit and coflow scheduling. We first formalize the CCT minimization problem into a 0-1 programming problem, then relax and solve the problem in 2 steps to obtain the coflow order and flow grouping decisions on each circuit. Thus intra-group reconfiguration delays are saved, and small coflows can be prioritized at the group level. Theoretical analysis proves GOS is a 4-approximation algorithm in average CCT. To reduce computing overheads, we further propose a heuristic approximation algorithm. Extensive simulations show that the heuristic algorithm has satisfactory CCT performance (0.12× Varys, 0.36× Sunflow) as well as high throughput (16.74× Varys, 1.32× Sunflow), and well adapts to a wide range of reconfiguration delays and algorithm decision time.
- Published
- 2021
30. Multiple Access Alternatives
- Author
-
Barry, John R., Lee, Edward A., Messerschmitt, David G., Barry, John R., Lee, Edward A., and Messerschmitt, David G.
- Published
- 2004
- Full Text
- View/download PDF
31. Load Distribution and Determination of Loss Probability in Asynchronous Network
- Author
-
Sembiyev, Ordabay, Kemelbekova, Zhanar, and Umarova, Zhanat
- Published
- 2020
- Full Text
- View/download PDF
32. Performance of Multicast Sessions in Wavelength-Routed WDM Networks
- Author
-
Kamal, Ahmed E., Al-Yatama, Anwar K., and Jukan, Admela, editor
- Published
- 2002
- Full Text
- View/download PDF
33. A New Router Architecture for High-Performance Intrachip Networks
- Author
-
Everton Alceu Carara, Ney Calazans, and Fernando Moraes
- Subjects
Router ,Circuit switching ,Engineering ,business.industry ,Network packet ,Quality of service ,Complex system ,Network on a chip ,Packet switching ,Session layer ,Embedded system ,Electrical and Electronic Engineering ,business ,Computer network - Abstract
For almost a decade now, Network on Chip (NoC) concepts have evolved to provide an interesting alternative to more traditional intrachip communication architectures (e.g. shared busses) for the design of complex Systems on Chip (SoCs). A considerable number of NoC proposals are available, focusing on different sets of optimization aspects, related to specific classes of applications. Each such application employs a NoC as part of its underlying implementation infrastructure. Many of the mentioned optimization aspects target results such as Quality of Service (QoS) achievement and/or power consumption reduction. On the other hand, the use of NoCs brings about the solution of new design problems, such to the choice of synchronization method to employ between NoC routers and application modules mapping. Although the availability of NoC structures is already rather ample, some design choices are at base of many, if not most, NoC proposals. These include the use of wormhole packet switching and virtual channels. This work pledges against this practice. It discusses trade-offs of using circuit or packet switching, arguing in favor the use of the former with fixed size packets (cells). Quantitative data supports the argumentation. Also, the work proposes and justifies replacing the use of virtual channels by replicated channels, based on the abundance of wires in current and expected deep sub-micron technologies. Finally, the work proposes a transmission method coupling the use of session layer structures to circuit switching to better support application implementation. The main reported result is the availability of a router with reduced latency and area, a communication architecture adapted for high-performance applications.
- Published
- 2020
34. A blocking optimization method by convergence of cores for application-based optical circuit switched network-on-chip.
- Author
-
Xu, Wentao, Wu, Ning, and Liu, Bing
- Subjects
- *
BLOCKING oscillators , *TECHNOLOGY convergence , *NETWORKS on a chip , *INTELLECTUAL property , *ENERGY dissipation - Abstract
With the development of technology of integrated circuit (IC), there will be several hundred million or even several billion transistors in one chip. Optical network on chip (ONoC) has been identified as an effective communication architecture to achieve better performance in delay and energy consumption. However, in circuit switched ONoC, the blocking situation degrades the performance severely. In this paper, a method that converge intellectual property (IP) cores with the same destination address or the same source address is proposed to reduce the blocking probability in circuit switched ONoC. We compare the proposed converged circuit switched ONoC with non-converged circuit switched ONoC in terms of end-to-end (ETE) delay and energy dissipation under various applications. The simulation results show that the converged ONoC improves the ETE delay with small change in energy efficiency. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
35. Integration of IP-Packet/ATM/Circuit-Switching Traffic and Optimum Conditions of the Relative Cost Function for Typical Traffic Modes
- Author
-
Miyaho, Noriharu, Tsang, Danny H. K., editor, and Kühn, Paul J., editor
- Published
- 2000
- Full Text
- View/download PDF
36. Just-In-Time Optical Burst Switching for Multiwavelength Networks
- Author
-
Wei, John Y., Pastor, Jorge L., Ramamurthy, Ramu S., Tsai, Yukun, Tsang, Danny H. K., editor, and Kühn, Paul J., editor
- Published
- 2000
- Full Text
- View/download PDF
37. Circuit-switched broadcast in multi-port 2D tori
- Author
-
Wang, San-Yuan, Tseng, Yu-Chee, Ni, Sze-Yao, Sheu, Jang-Ping, Goos, Gerhard, editor, Hartmanis, Juris, editor, van Leeuwen, Jan, editor, Sloot, Peter, editor, Bubak, Marian, editor, Hoekstra, Alfons, editor, and Hertzberger, Bob, editor
- Published
- 1999
- Full Text
- View/download PDF
38. Optimal Control of SOAs With Artificial Intelligence for Sub-Nanosecond Optical Switching
- Author
-
Zacharaya Shabka, Bawang Goh, W. Konrad Chlupka, Georgios Zervas, and Christopher W. F. Parsonson
- Subjects
Signal Processing (eess.SP) ,Optical amplifier ,Circuit switching ,Computer science ,business.industry ,Particle swarm optimization ,020206 networking & telecommunications ,Systems and Control (eess.SY) ,02 engineering and technology ,Optimal control ,Electrical Engineering and Systems Science - Systems and Control ,Optical switch ,Atomic and Molecular Physics, and Optics ,020210 optoelectronics & photonics ,Control theory ,Genetic algorithm ,FOS: Electrical engineering, electronic engineering, information engineering ,0202 electrical engineering, electronic engineering, information engineering ,Overshoot (signal) ,Artificial intelligence ,Electrical Engineering and Systems Science - Signal Processing ,business - Abstract
Novel approaches to switching ultra-fast semiconductor optical amplifiers using artificial intelligence algorithms (particle swarm optimisation, ant colony optimisation, and a genetic algorithm) are developed and applied both in simulation and experiment. Effective off-on switching (settling) times of 542 ps are demonstrated with just 4.8% overshoot, achieving an order of magnitude improvement over previous attempts described in the literature and standard dampening techniques from control theory., This manuscript was accepted for publication in the IEEE/OSA Journal of Lightwave Technology on 21st June 2020. Open access code: https://github.com/cwfparsonson/soa_driving Open access data: https://doi.org/10.5522/04/12356696.v1
- Published
- 2020
39. Surix: Non-blocking and low insertion loss micro-ring resonator-based optical router for photonic network on chip
- Author
-
Mahdi Mehrabi, Sanaz Asadinia, and Elham Yaghoubi
- Subjects
Router ,Circuit switching ,business.industry ,Computer science ,Mesh networking ,Physical layer ,Network topology ,Theoretical Computer Science ,Hardware and Architecture ,Electronic engineering ,Insertion loss ,Network performance ,Photonics ,business ,Software ,Information Systems - Abstract
Photonic network-on-chip is utilized as a candidate paradigm for important attributes such as high bandwidth and low energy consumption. In this paper, a non-blocking five-port photonic router is proposed for the 2-D mesh topology, which is called Surix. Surix has been designed for improving the physical layer and the network’s performance parameters in multi-core network topologies. Moreover, a new routing algorithm on Surix is proposed, in which turning models and the circuit switching method are used for mitigating photonic insertion loss and power consumption of the photonic layer. The proposed algorithm can select various source and destination nodes through the selected routes with the lowest insertion loss and power consumption. The simulation results show that Surix outperforms conventional routers in network performance parameters. For instance, the insertion loss of Surix in the mesh topology shows a 9.92–37.15 percent improvement compared to conventional routers.
- Published
- 2020
40. Experimental research on configuration optimization of a frost-free refrigerator-freezer with the parallel circuit cycle
- Author
-
Jianlin Yu, Gang Yan, Min Zhou, and Guoqiang Liu
- Subjects
Circuit switching ,Suction ,Materials science ,020209 energy ,Mechanical Engineering ,Refrigerator car ,02 engineering and technology ,Building and Construction ,Mechanics ,Series and parallel circuits ,Volumetric flow rate ,Refrigerant ,020401 chemical engineering ,0202 electrical engineering, electronic engineering, information engineering ,Tube (fluid conveyance) ,0204 chemical engineering ,Voltage - Abstract
This paper presents an experimental research on configuration optimization of a frost-free refrigerator-freezer with the parallel circuit cycle based on the analysis of circuit switching characteristics. Through combination optimization of R-fan voltage, F-fan voltage, R-capillary tube flow capacity, refrigerant charge, structure of suction pipe, F-compressor speed and R-compressor speed, the system could save 9.27% energy consumption compared with the initial condition. The experimental results also showed that the larger the R-capillary tube flow capacity, the larger the flow rate of the RC, resulting in the quickly temperature drop in R-cabinet and slowly temperature drop in R-cabinet based on “R-cabinet temperature priority” control strategy. Additionally, the R-cabinet temperature drop rate decreased with the increase of ambient temperature but the F-cabinet temperature drop rate was almost unaffected by the ambient temperature.
- Published
- 2020
41. PULSE: Optical Circuit Switched Data Center Architecture Operating at Nanosecond Timescales
- Author
-
Thomas Gerard, Domanic Lavery, Georgios Zervas, Joshua L. Benjamin, and Polina Bayvel
- Subjects
Networking and Internet Architecture (cs.NI) ,FOS: Computer and information sciences ,Circuit switching ,Network architecture ,business.industry ,Computer science ,Latency (audio) ,Control reconfiguration ,020206 networking & telecommunications ,Throughput ,02 engineering and technology ,Circuit Switched Data ,7. Clean energy ,Optical switch ,Atomic and Molecular Physics, and Optics ,Computer Science - Networking and Internet Architecture ,020210 optoelectronics & photonics ,Computer Science - Distributed, Parallel, and Cluster Computing ,0202 electrical engineering, electronic engineering, information engineering ,Node (circuits) ,Distributed, Parallel, and Cluster Computing (cs.DC) ,business ,Computer hardware - Abstract
We introduce PULSE, a sub-microsecond optical circuit-switched data centre network architecture controlled by distributed hardware schedulers. PULSE is a flat architecture that uses parallel passive coupler-based broadcast and select networks. We employ a novel transceiver architecture, for dynamic wavelength-timeslot selection, to achieve a reconfiguration time down to O(100ps), establishing timeslots of O(10ns). A novel scheduling algorithm that has a clock period of 2.3ns performs multiple iterations to maximize throughput, wavelength usage and reduce latency, enhancing the overall performance. In order to scale, the single-hop PULSE architecture uses sub-networks that are disjoint by using multiple transceivers for each node in 64 node racks. At the reconfiguration circuit duration (epoch = 120 ns), the scheduling algorithm is shown to achieve up to 93% throughput and 100% wavelength usage of 64 wavelengths, incurring an average latency that ranges from 0.7-1.2 microseconds with best-case 0.4 microsecond median and 5 microsecond tail latency, limited by the timeslot (20 ns) and epoch size (120 ns). We show how the 4096-node PULSE architecture allows up to 260k optical channels to be re-used across sub-networks achieving a capacity of 25.6 Pbps with an energy consumption of 85 pJ/bit., 16 pages, 12 figures
- Published
- 2020
42. Establishment of Theory of Power Conversion by Circuit Switching
- Author
-
Tung-Hai Chin
- Subjects
Circuit switching ,business.industry ,Computer science ,Mechanical Engineering ,Power electronics ,Automotive Engineering ,Electrical engineering ,Energy Engineering and Power Technology ,Electrical and Electronic Engineering ,business ,Electromagnetic radiation ,Industrial and Manufacturing Engineering ,Power (physics) - Published
- 2020
43. Solar PV array-based DC–DC converter with MPPT for low power applications
- Author
-
Sabha Raj Arya, Akhil Raj, and Jyoti Gupta
- Subjects
Circuit switching ,Materials science ,Renewable Energy, Sustainability and the Environment ,020209 energy ,020208 electrical & electronic engineering ,Photovoltaic system ,02 engineering and technology ,Converters ,Inductor ,Maximum power point tracking ,Power (physics) ,law.invention ,Capacitor ,law ,0202 electrical engineering, electronic engineering, information engineering ,Electronic engineering ,Voltage - Abstract
This article discusses a DC–DC converter based solar fed PV array system for low power applications. A single diode based solar panel is designed and modelled for this PV array system. At low value of irradiance in solar panel, the system will perform with better accuracy. To acquire better efficiency, the similar system is operated with Maximum Power Point Tracking (MPPT) control algorithm. The solar panel current v/s Voltage (I–V) and Power v/s Voltage (P–V) characteristics curves are obtained from Matlab simulation. The comparison of simulation curves is also done with the curves obtained from the experiment results. The detailed investigation of DC–DC converters with solar fed system with soft-switching technique is also performed. This soft-switching technique is formed by using the resonant inductors and capacitors. These passive components reduce the circuit switching losses. The Zero Voltage Switching (ZVS) technique is used to eliminate the switching losses developed in the circuit at the time of switching transitions. This technique also reduces the dv/dt noise owing to junction capacity discharge. This Proposed ZETA and SEPIC converters based system are modelled and simulated in MATLAB program and its performance is evaluated through experimentation in the terms of losses and efficiency. From the performance study of ZVS ZETA and SEPIC converter, increment in efficiency are obtained 1.97% and 7.23% under Perturb and Observe MPPT control and 4.14% and 0.41% in Incremental Conductance MPPT control respectively as compared to its conventional ZETA and SEPIC converter.
- Published
- 2020
44. Parallel Modular Scheduler Design for Clos Switches in Optical Data Center Networks
- Author
-
Paris Andreades and Georgios Zervas
- Subjects
Circuit switching ,business.industry ,Computer science ,Network packet ,02 engineering and technology ,Network emulation ,Optical switch ,Atomic and Molecular Physics, and Optics ,Scheduling (computing) ,020210 optoelectronics & photonics ,Clos network ,Packet switching ,Packet loss ,0202 electrical engineering, electronic engineering, information engineering ,business ,Computer network - Abstract
As data centers enter the exascale computing era, the traffic exchanged between internal network nodes, increases exponentially. Optical networking is an attractive solution to deliver the high capacity, low latency, and scalable interconnection needed. Among other switching methods, packet switching is particularly interesting as it can be widely deployed in the network to handle rapidly-changing traffic of arbitrary size. Nanosecond-reconfigurable photonic integrated switch fabrics, built as multi-stage architectures such as the Clos network, are key enablers to scalable packet switching. However, the accompanying control plane needs to also operate on packet timescales. Designing a central scheduler, to control an optical packet switch in nanoseconds, presents a challenge especially as the switch size increases. To this end, we present a highly-parallel, modular scheduler design for Clos switches along with a proposed routing scheme to enable nanosecond scalable scheduling. We synthesize our scheduler as an application-specific integrated circuit (ASIC) and demonstrate scaling to a 256 × 256 size with an ultra-low scheduling delay of only 6.0 ns. In a cycle-accurate rack-scale network emulation, for this switch size, we show a minimum end-to-end latency of 30.8 ns and maintain nanosecond average latency up to 80% of input traffic load. We achieve zero packet loss and short-tailed packet latency distributions for all traffic loads and switch sizes. Our work is compared to state-of-the-art optical switches, in terms of scheduling delay, packet latency, and switch throughput.
- Published
- 2020
45. Load Distribution and Determination of Loss Probability in Asynchronous Network
- Author
-
Zhanar Satybaldievna Kemelbekova, Zhanat Umarova, and Ordabay Sembiyev
- Subjects
Circuit switching ,Computer science ,General Mathematics ,Probabilistic logic ,General Physics and Astronomy ,General Chemistry ,Topology ,Subnet ,Packet switching ,Transmission (telecommunications) ,Asynchronous Transfer Mode ,General Earth and Planetary Sciences ,General Agricultural and Biological Sciences ,Subnetwork ,Communication channel - Abstract
In this paper, a general description of the problem of calculating probability–time characteristics was presented. At the initial stage of studying this problem, we studied the asynchronous data transmission of the constituent broadband digital network with the integration of services for both the channel switching subnetwork and the packet switching subnetwork. And also the circuit switching subnetwork was investigated using the bypass of the direction of transmission of the stream of multi-channel calls. At the same time, the source data of the problem of calculating probabilistic characteristics were set for the channel switching subnetwork, the characteristics that were determined during the solution of the problem were listed, and some assumptions were described that made it possible to adequately approximate the study of such a model to the functioning of a real network. Next, a mathematical model for calculating the loss probabilities was described, both for communication channels and for nodes of the channel switching subnetwork included in the asynchronous transfer mode network. The model of information traffic transmission is presented, where the method is implemented using network bypass directions. A method has been developed for generating a nodal load of a channel switching subnet and a system of equations has been obtained, the solution of which determines the value of a nodal load relative to the probability of loss on communication channels and proved the uniqueness of the solution of this system of equations.
- Published
- 2020
46. A Dynamically-Reconfigurable Burst-Mode Link Using a Nanosecond Photonic Switch
- Author
-
Valerija Kamchevska, Laurent Schares, Nicolas Dupuis, Benjamin G. Lee, Christian W. Baks, Alex Forencich, and George C. Papen
- Subjects
Circuit switching ,Silicon photonics ,Computer science ,business.industry ,Bit error rate ,Electronic engineering ,Control reconfiguration ,Photonics ,business ,Optical switch ,Electrical efficiency ,Atomic and Molecular Physics, and Optics ,Burst mode (computing) - Abstract
Fast optical circuit switching has significant potential to solve scaling issues with traditional packet-switch-based networks and improve bandwidth and power efficiency in datacenter and high-performance computing applications. One difficultly in utilizing a fast optical switch is that the optical signal must be rapidly reacquired after each switching event so as to not significantly impact the overall throughput of the system. Here we present a system-level integration of a nanosecond-scale $2\times 2$ silicon photonic switch with a 25-Gbps burst-mode receiver that can lock in 31 ns. A novel FPGA-based control plane was used to generate test data, control the silicon photonic switch and burst-mode receiver, and measure bit errors at 12.5 and 20 Gbps. Error-free links (BER $ ) with system-level reconfiguration times below 60 ns (at 20 Gbps) and 90 ns (at 12.5 Gbps) including bit- and frame-synchronization are demonstrated.
- Published
- 2020
47. IMPROVEMENT OF CALL SETUP TIME DURING CIRCUIT SWITCHED FALLBACK
- Author
-
Almaz Mehdiyeva
- Subjects
Circuit switching ,Computer science ,business.industry ,Electrical engineering ,Call setup ,business - Abstract
In handover procedure, target cell would be prepared and UE will move on target cell based on the configuration sent by source eNodeB to User Equipment. Cell Reselection happens only when the user equipment (or Mobile Phone) is in Idle MODE, and the User Equipment needs to go a more appropriate cell. The main feature of CSFB Ps handover does not interrupt data transfer when switching from Long Term Evolution to UTRAN/GSM. After switching to 3G is already in connected mode it does not waste time to switch to connected mode. This feature let us improve call setup time when we make call in LTE.
- Published
- 2020
48. Relay-semiconductor circuit switching in safe interface units based on electromagnetic relays
- Author
-
Alexey Nikolaevich Kovkin
- Subjects
Circuit switching ,Semiconductor ,business.industry ,Relay ,law ,Computer science ,Interface (computing) ,Electrical engineering ,business ,law.invention - Abstract
The paper considers methods of realization of relaysemiconductor circuit switching in systems of railway automatics with the use of promising elemental base. It also gives recommendations on selection of semiconductor switching elements for various spheres of application of relay interface units.
- Published
- 2020
49. RSS: a relay-based schedule scheme for optical data center network
- Author
-
Kun Wang, Huaxi Gu, Hao Lan, Shangqi Ma, and Xiaoshan Yu
- Subjects
Circuit switching ,Computer Networks and Communications ,business.industry ,Computer science ,Network packet ,Control reconfiguration ,02 engineering and technology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,law.invention ,Scheduling (computing) ,010309 optics ,020210 optoelectronics & photonics ,Packet switching ,Bandwidth allocation ,Hardware and Architecture ,Relay ,law ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,Latency (engineering) ,business ,Software ,Computer network - Abstract
The ever-increasing communication requirements have led to the introduction of optical circuit switch (OCS) to data center, which is capable of providing more flexible bandwidth allocation compared to the electrical packet switching. However, the challenge still arises due to non-negligible reconfiguration delay of commercially available MEMS-based optical circuit switching technology, even though it provides high bandwidth with low per-bit cost and power. Additionally, existing scheduling schemes amortize long switch delay by means of reconfiguring OCS every a few 100 s of milliseconds, not only causing the degradation of the latency performance, but also incurring the low utilization of optical links. In this paper, we propose an OCS-based scheduling scheme called relay-based schedule scheme (RSS), which can leverage idle optical paths to forward traffic from remote nodes only with straightforward software modifications on controller. We evaluate the performance of the proposed scheme via OMNET++ simulator, and the results demonstrate that our proposal delivers significant benefits, including reducing the average mice flow FCTs (flow complete time) by up to 80% and reducing the end-to-end packet delay by 50% compared to non-RSS schemes.
- Published
- 2019
50. Physical Layer Driven Optical Switching for Data Center Networks
- Author
-
Mellette, William Maxwell
- Subjects
Electrical engineering ,Optics ,Circuit switching ,Data center ,Microelectromechanical devices ,Optical communication ,Optical fiber switches ,Optical interconnects - Abstract
Today’s data center networks operate at the cutting edge of fiber optic link and electronic packet switching capabilities. The immense bandwidth requirements of next-generation data centers will stress the limits of electronic switching, providing an opportunity for transparent optical switching to deliver an overall cost-bandwidth advantage. However, current optical switching approaches are not optimal for data center networks because they either do not scale to large port count, reconfigure too slowly, or introduce insertion loss or crosstalk levels incompatible with cost-effective optical transceivers. This dissertation presents the design and demonstration of a novel optical switch architecture more well-suited to data centers, along with the design of overall network architectures that employ this new switch architecture.The dissertation begins at the physical layer with a scalability assessment of conventional microelectromechanical systems (MEMS) based beam-steering optical switching. MEMS beam-steering cross-connects are the only optical switching technology which has demonstrated the large port count and broadband, polarization-insensitive transmission necessary to approach the scale and link power budgets of modern data center networks. The shortcoming of conventional cross-connects is their slow reconfiguration time, which prevents them from effectively provisioning bandwidth on the timescales necessary for a potentially large fraction of data center traffic. First-principles analysis at the device level indicates that, rather than a straightforward redesign of existing crossbar switches, entirely new switch architectures are necessary to meet the optical switching performance required for data centers.Motivated by physical layer analysis, a novel selector switch architecture is presented which, through an unconventional approach of relaxing the degree of switch configurability, allows MEMS beam-steering switching elements to scale to microsecond-class response speeds while supporting large port count and low loss switching. The switch is partially configurable in that it selects port mapping patterns from a small hardware library of preconfigured mappings, rather than implementing arbitrary mappings like a crossbar. The physical architecture of the switch uses pupil-division and relay imaging, permitting designs compatible with single-mode or multi-mode fiber optics. The design, fabrication, and experimental characterization is presented for a proof-of-principle prototype using a single MEMS comb-driven micromirror to achieve 150 microsecond switching of 61 single-mode ports between 4 preconfigured port mappings. The scalability of this switch architecture is demonstrated with the detailed optical design of a low-loss 2,048-port selector switch with 20 microsecond switching time.Because conventional network architectures are typically based on crossbar switches, new overall network architectures are required to utilize the partial configurability of selector switches. The dissertation concludes with an investigation of network architectures based on selector switches, showing, perhaps unexpectedly, that partially configurable networks can deliver aggregate bandwidth approaching that of a fully-provisioned electronically-switched network for common network traffic patterns, but for reduced cost, cabling complexity, and power consumption.The approach taken in this dissertation of developing switch and network architectures which balance scalability at the physical layer and performance at the network layer will hopefully aid in the design of future optical data center networks.
- Published
- 2016
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.