Abstract: "Over the past few years, there has been a strong and growing interest in faster network technologies such as FDDI and ATM. However, the perceived throughput at the application level has not always increased accordingly. Various performance bottlenecks have been encountered each of which has to be analysed and corrected. This paper presents a performance evaluation of continuous video data streams over ATM networks and compares them with similar experiments over Ethernet networks. The ATM LAN testbed for these experiments consists of three SG R4000 Indigos workstations connected by ATM Fore first generation interface cards and a Synoptics ATM switch. It is expected that video applications would run faster on ATM networks than Ethernet networks. A preliminary examination suggested to us that data movements through the protocol stack and the processing overheads were considerably high and that with some parameter settings, experiments with Ethernet would perform four to five times better than those with ATM. To address and explore this issue, a packetisation process has been added within the video application that would split each video frame into a number of packets. We show that by implementing a packetisation process at the application level, the end host is able to deliver cells at a faster rate. The sensitivity of these parameters, and also the overheads involved are discussed. The results are consistent over a range of video frame sizes: CIF(25 K), QCIF(101 K), and SCIF(405 K)."
Abstract: "Over the past few years, there has been a strong and growing interest in faster network technologies such as FDDI and ATM. However, the perceived throughput at the application level has not always increased accordingly.
That is, the measured traffic is bursty over a wide range of time intervals. Furthermore, the emergence of high-speed network backbones demands the study of accurate models of aggregated traffic to assess network performance.
Asynchronous Transfer Mode (ATM) technology is currently receiving extensive attention in the computer networking arena. Many experts predict that ATM will be the future networking technology for both the Local Area Network (LAN) and the Wide Area Network (WAN). This paper presents the results of a collaboration between Sandia National Laboratories' Advanced Networking Department and Engineering Sciences Center to study the implementation of ATM in one of Sandia's most heavily loaded production networks. The network consists of over 120 Sun Sparc 10s and 20s, two SparcCenter 2000s, a 12 node parallel IBM SP-2, and several other miscellaneous high-end workstations. The existing network was first characterized through extensive traffic measurements to better understand the capabilities and limitations of the existing network technologies and to provide a baseline for comparison to an ATM network. This characterization was used to select a subset of the network elements which would benefit most from conversion to the ATM technology. This subset was then converted to equipment based on the latest ATM standards. With direct OC-3c (155 Mbps) host connections for the workstations and the file and compute servers, we demonstrated as much as 122 Mbps throughput (memory-to-memory TCP/IP transfers) between endpoints. Flow control in the classical many-to-one client server environment was also investigated. Throughout all of our tests, the interaction of the user applications with the network technologies was documented and possible improvements were tested. The performance and reliability of the ATM network was compared to the original network to determine the benefits and liabilities of the ATM technology.
This characterization was used to select a subset of the network elements which would benefit most from conversion to the ATM technology. This subset was then converted to equipment based on the latest ATM standards.
Abstract: "To aid the early adoption of ATM technology as a local area network the ATM Forum has defined the LAN Emulation over ATM specification which aims to present a service interface more compatible with that of previous LANs.
We estimate a structural model of the market for automatic teller machines (ATMs) in order to evaluate the implications of regulating ATM surcharges on ATM entry and consumer and producer surplus. We estimate the model using data on firm and consumer locations, and identify the parameters of the model by exploiting a source of local quasi-experimental variation, that the state of Iowa banned ATM surcharges during our sample period while the state of Minnesota did not. We develop new econometric methods that allow us to estimate the parameters of equilibrium models without computing equilibria. Monte Carlo evidence shows that the estimator performs well. We find that a ban on ATM surcharges reduces ATM entry by about 12 percent, increases consumer welfare by about 10 percent and lowers producer profits by about 10 percent. Total welfare remains about the same under regimes that permit or prohibit ATM surcharges and is about 17 percent lower than the surplus maximizing level. This paper can help shed light on the theoretically ambiguous implications of free entry on consumer and producer welfare for differentiated products industries in general and ATMs in particular.
We estimate a structural model of the market for automatic teller machines (ATMs) in order to evaluate the implications of regulating ATM surcharges on ATM entry and consumer and producer surplus.
The growth in electronic transactions and banking system has resulted in greater demand for fast access of banking transactions with the aid of Automated Teller Machine (ATM). The quick increment in the utilization of ATM transactions has been closely followed by the increase in ATM frauds. The security problem and fraudulent transactions are the biggest deterrents in the continuous or widespread us e of ATM transactions. For the security of ATM just possession of password or prior knowledge of computer systems or ATM machines not altogether enough. In ATM, security is essential in different aspects including physical machines, transactions, user authentication and integrity and finally user security itself. Hence fraud prevention and security has become essential ingredients in order to increase the number of ATM users and to improve client trust and confidence over ATM's. This paper explains about and examines the different types of security breaches in ATM banking systems. This paper also expounds improved security solutions to ATM's in multiphase's, which take into accounts all the aspects of security in all fields of ATM banking system, which is derived through focus group interaction. This paper could assume a functioning job in genuine research on ATM transaction framework security.
The growth in electronic transactions and banking system has resulted in greater demand for fast access of banking transactions with the aid of Automated Teller Machine (ATM).
ATM traffic modeling is a rapidly developing research area. In order to test and evaluate the performance of ATM networ s and switches, modeling stochastic processes with various distributions is required.
A concise, readable guide to using ATM technology, this books explains the technology for networking administrators, analysts, and designers concerned with providing enough bandwidth for their organization's needs. Detailed coverage includes the uses of cell relay in enterprise networks, uses of CRS for video/multimedia applications, ATM/AAL, typical user equipment and availability, and more.
A concise, readable guide to using ATM technology, this books explains the technology for networking administrators, analysts, and designers concerned with providing enough bandwidth for their organization's needs.
