Papers by Charles Kalmanek
This paper proposes a hybrid distributed/centralized restoration mechanism for restoration path s... more This paper proposes a hybrid distributed/centralized restoration mechanism for restoration path selection and a channel selection scheme that eliminates almost all glares. As shown from simulation in a typical intercity backbone network, our proposed hybrid mechanism improves the first restoration attempt success ratio by 40% compared to a pure distributed restoration approach. In addition, the proposed restoration path selection algorithm saves up to 50% of restoration capacity compared with the disjoint shortest path algorithm and 15% compared with a previously published greedy algorithm
System and method for distributed content transformation
Routing over large clouds
Method of routing a request for a virtual circuit based on information from concurrent requests
Method for selecting restoration path in a mesh network
Streaming Video Trac : Characterization and Network Impact
Wcw, 2002
The emergence of the Internet as a pervasive communi- cation medium, and the widespread availabil... more The emergence of the Internet as a pervasive communi- cation medium, and the widespread availability of digi- tal video technology have led to the rise of several net- worked streaming media applications such as live video broadcasts, distance education and corporate telecasts. This paper studies the trac associated with two major categories of streaming content - on-demand streaming of pre-recorded
Optical Data communication system and method
A method of on-line permanent virtual circuit routing
Method for selecting a restoration path in a mesh network
Method and apparatus for providing a control plane across multiple optical network domains
Data flow control arrangement for local area network
Computer Communications and Networks, 2010
transmitted, in any form or by any means, with the prior permission in writing of the publishers,... more transmitted, in any form or by any means, with the prior permission in writing of the publishers, or in the case of reprographic reproduction in accordance with the terms of licenses issued by the Copyright Licensing Agency. Enquiries concerning reproduction outside those terms should be sent to the publishers. The use of registered names, trademarks, etc., in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant laws and regulations and therefore free for general use. The publisher makes no representation, express or implied, with regard to the accuracy of the information contained in this book and cannot accept any legal responsibility or liability for any errors or omissions that may be made.
Optical Networking, 2001
Emerging optical networks will provide very high bandwidth connections to users. However, improvi... more Emerging optical networks will provide very high bandwidth connections to users. However, improving provisioning times and restoration capabilities after a network failure are important issues in evolving the optical networks. The application of IP-based protocols to the optical network control plane has opened up new opportunities and challenges for network designers. Although much work has been done on standardization of the relevant protocols, the reliability of optical networks and their control plane needs further investigation. Based on our experience prototyping an IP based control plane, this paper discusses some general requirements and proposed solutions for reliable optical network design from a service and operational perspective. Our experiments suggest that a reliable IP based control plane for fast provisioning and restoration in optical network is feasible with careful design.
Proceedings of the 1st annual international conference on Mobile computing and networking - MobiCom '95, 1995
Abstmct-Rednet provides portable computers with an incxpensivc wireless network connection. It is... more Abstmct-Rednet provides portable computers with an incxpensivc wireless network connection. It is designed to support seamless end-to-end communication using the Asynchronous Transfer Mode (ATM). Rednet uses a Iowpower infrared transceiver operating at 2-5 Mbps over a distance of 4 meters. The link layer protocol supports link sharing and transport of ATM cells over the link. Ceiling mounted base stalions in each room act as gateways between the infrared link and rhe wired network. Rednet is designed to support user mobility, so that users can roam from room to room and access network services in a location independent manner. The paper describes our infrared physical layer and link layer protocols, presents an ovcrview of protocols for dynamic address assignment and conncction management, and summarizes the status of the work.
Multimedia Systems, 1994
Xunet 2 is a collaborative research program with a goal of understanding the fundamental issues i... more Xunet 2 is a collaborative research program with a goal of understanding the fundamental issues in the performance of ATM networks. These networks are expected to carry a mixture of constant bit rate traffic, variable bit rate traffic and computer traffic spanning a wide range of performance requirements. This paper describes these service requirements and matches them with performance guarantees that can be provided by the scheduling discipline supported by an experimental ATM switch. The scheduler supports per-virtual-circuit queueing and several priorities of round robin service in order to segregate real-time and non-real-time traffic and provide fair sharing for bursty computer traffic. Detailed simulations show that real-time traffic can be efficiently integrated with non-real-time traffic using appropriate call admission policies and enhancements to traditional round robin scheduling. While the present study is focused on providing quality of service guarantees in the Xunet 2 network, the design of the scheduler and the call admission policies are relevant to ATM networks in general.
Xunet 2: A Nationwide Testbed in High-Speed Networking
IEEE INFOCOM, 1992
Xunet 2 is an experimental wide-area network that serves as a testbed for research on data commun... more Xunet 2 is an experimental wide-area network that serves as a testbed for research on data communications techniques. The authors provide an overview of the architecture of the Xunet 2 testbed. Xunet 2 has three principal components: routers, switches and network management systems. Long-haul transmission between them will initially use DS3 facilities. Performance objectives for the backbone have been set
Internet Measurement Workshop, 2002
Understanding the variability of Internet traffic in backbone networks is essential to better pla... more Understanding the variability of Internet traffic in backbone networks is essential to better plan and manage existing networks, as well as to design next generation networks. However, most traffic analyses that might be used to approach this problem are based on detailed packet or flow level measurements, which are usually not available throughout a large network. As a result there
ACM SIGCOMM Computer Communication Review, 2002
ATM was the focus of active research and significant investment in the early to mid 1990's. T... more ATM was the focus of active research and significant investment in the early to mid 1990's. This paper discusses several visions for ATM prevalent at the time, and analyzes how ATM evolved during this period. The paper also considers the implications of this history for current connection-oriented technologies, such as optical transport networks and MPLS.
Computer Communications, 1996
This paper considers the problem of routing a set of permanent virtual circuit requests over a ba... more This paper considers the problem of routing a set of permanent virtual circuit requests over a backbone network. Several factors make this routing problem complicated. Routing decisions must be made on-line without any knowledge of future request sets. Furthermore, frequent rerouting to correct inefficiencies that can result from the on-line routing decisions is not possible since rerouting creates a service disruption for the customer. Finally, the forward and reverse bandwidth of a virtual circuit must be routed over the same single path. Using an extensive set of simulations, this paper evaluates several different strategies for on-line permanent virtual circuit routing. We find that a strategy based on recent results in competitive analysis and ideas from combinatorial optimization consistently provides the best performance.
Proceedings of the 4th …, 2003
Edge-Side Includes (ESI) is an open mark-up language that allows content providers to break their... more Edge-Side Includes (ESI) is an open mark-up language that allows content providers to break their pages into fragments with individual caching characteristics. A page is reassembled from ESI fragments by a content delivery network (CDN) at an edge server ...
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Papers by Charles Kalmanek