ATM Switch (atm + switch)

Distribution by Scientific Domains


Selected Abstracts


Performance of the Dual-Banyan ATM switch under arbitrary traffic patterns,

EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS, Issue 4 2003
Igor Radusinovic
Dual-Banyan (DB) is a buffered banyan asynchronous transfer mode (ATM) switch encompassing multiple input-queueing (bifurcated queueing) as its buffering strategy. This paper describes a new analytical model for a performance evaluation of the DB switch under arbitrary traffic patterns. The model developed and presented enables the computation of the switch normalized throughput and the average packet delay by iterative calculations. The efficiency of the given model is verified through a comparison with simulation results, too. We compare throughputs of DB switch and input buffer banyan, and show that DB switch has significantly better performance levels. Copyright © 2003 AEI. [source]


An approximate analysis of shared-buffer channel-grouped ATM switches under imbalanced traffic

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 5 2006
Xuan-Hien Dang
Abstract Grouping output channels in a shared-buffer ATM switch has shown to provide great saving in buffer space and better throughput under uniform traffic. However, uniform traffic does not represent a realistic view of traffic patterns in real systems. In this paper, we extend the queuing analysis of shared-buffer channel-grouped (SBCG) ATM switches under imbalanced traffic, as it better represent real-life situations. The study focuses on the impact of the grouping factor and other key switch design parameters on the performance of such switches as compared to the unichannel allocation scheme in terms of cell loss probability, throughput, mean cell delay and buffer occupancy. Numerical results from both the analytical model and simulation are presented, and the accuracy of the analysis is presented. Copyright © 2005 John Wiley & Sons, Ltd. [source]


Fault tolerance in Clos,Knockout multicast ATM switch

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 9 2002
K. S. Chan
Abstract In this paper, we propose a new architecture for multicast ATM switches with fault tolerant capability based on the Clos,Knockout switch. In the new architecture, each stage has one more redundant switch module. If one switch module is faulty, the redundant module would replace the faulty one. On the other hand, under the fault-free condition, the redundant modules in the second and third stages will provide additional alternative internal paths, and hence improve the performance. The performance analysis shows that the cell loss probability is lower than the original architecture when all modules are fault free, and the reliability of the original architecture is improved. Copyright © 2002 John Wiley & Sons, Ltd. [source]


Queuing analysis of shared-buffer ATM switches with grouped output channels

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 3 2001
Abdullah A. Abonamah
Abstract Shared buffering and channel grouping are powerful techniques with great benefits in terms of both performance and implementation. Shared-buffer switches are known to have better performance and better utilization than input or output queued switches. With channel grouping, a cell is routed to a group of channels instead of a specific output channel. In this way, congestion due to output contention can be minimized and the switch performance can therefore be greatly improved. Although each technique is well known by itself in the traditional study of queuing systems, their combined use in ATM networks has not been much explored previously. In this paper, we develop an analytical model for a shared-buffer ATM switch with grouped output channels. The model is then used to study the switch performance in terms of cell loss probability, cell delay and throughput. In particular, we study the impact of the channel grouping factor on the buffer requirements. Our results show that grouping the output channels in a shared-buffer ATM switch leads to considerable savings in buffer space. Copyright © 2001 John Wiley & Sons, Ltd. [source]


An approximate analysis of shared-buffer channel-grouped ATM switches under imbalanced traffic

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 5 2006
Xuan-Hien Dang
Abstract Grouping output channels in a shared-buffer ATM switch has shown to provide great saving in buffer space and better throughput under uniform traffic. However, uniform traffic does not represent a realistic view of traffic patterns in real systems. In this paper, we extend the queuing analysis of shared-buffer channel-grouped (SBCG) ATM switches under imbalanced traffic, as it better represent real-life situations. The study focuses on the impact of the grouping factor and other key switch design parameters on the performance of such switches as compared to the unichannel allocation scheme in terms of cell loss probability, throughput, mean cell delay and buffer occupancy. Numerical results from both the analytical model and simulation are presented, and the accuracy of the analysis is presented. Copyright © 2005 John Wiley & Sons, Ltd. [source]


Fault tolerance in Clos,Knockout multicast ATM switch

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 9 2002
K. S. Chan
Abstract In this paper, we propose a new architecture for multicast ATM switches with fault tolerant capability based on the Clos,Knockout switch. In the new architecture, each stage has one more redundant switch module. If one switch module is faulty, the redundant module would replace the faulty one. On the other hand, under the fault-free condition, the redundant modules in the second and third stages will provide additional alternative internal paths, and hence improve the performance. The performance analysis shows that the cell loss probability is lower than the original architecture when all modules are fault free, and the reliability of the original architecture is improved. Copyright © 2002 John Wiley & Sons, Ltd. [source]


Queuing analysis of shared-buffer ATM switches with grouped output channels

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 3 2001
Abdullah A. Abonamah
Abstract Shared buffering and channel grouping are powerful techniques with great benefits in terms of both performance and implementation. Shared-buffer switches are known to have better performance and better utilization than input or output queued switches. With channel grouping, a cell is routed to a group of channels instead of a specific output channel. In this way, congestion due to output contention can be minimized and the switch performance can therefore be greatly improved. Although each technique is well known by itself in the traditional study of queuing systems, their combined use in ATM networks has not been much explored previously. In this paper, we develop an analytical model for a shared-buffer ATM switch with grouped output channels. The model is then used to study the switch performance in terms of cell loss probability, cell delay and throughput. In particular, we study the impact of the channel grouping factor on the buffer requirements. Our results show that grouping the output channels in a shared-buffer ATM switch leads to considerable savings in buffer space. Copyright © 2001 John Wiley & Sons, Ltd. [source]