Charles R. Kalmanek

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Future high-speed networks are expected to carry traffic with a wide range of performance requirements. We describe two queue service disciplines, rate-based scheduling and hierarchical round robin scheduling, that allow some connections to receive guaranteed rate and jitter performance, while others receive best effort service. Rate-based scheduling is(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, which selectively downloads from the origin content server only those fragments that are necessary (as(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(More)
Communities of interest (COI) have been applied in a variety of environments ranging from characterizing the online buying behavior of individuals to detecting fraud in telephone networks. The common thread among these applications is that the historical COI of an individual can be used to predict future behavior as well as the behavior of other members of(More)
Traffic, usage, and performance measurements are crucial to the design, operation and control of Internet Protocol (IP) networks. This paper describes a prototype infrastructure for the measurement, storage and correlation of network data of different types and origins from AT&T’s commercial IP network. We focus first on some novel aspects of the(More)
The emergence of the Internet as a pervasive communication medium, and the widespread availability of digital video technology have led to the rise of several networked streaming media applications such as live video broadcasts, distance education and corporate telecasts. This paper studies the traffic associated with two major categories of streaming(More)
In MPLS/GMPLS networks, a range of restoration schemes will be required to support different tradeoffs between service interruption time and network resource utilization. In light of these tradeoffs, path-based end-to-end shared mesh restoration provides a very attractive solution. However, efficient use of bandwidth for shared mesh restoration strongly(More)
Packet telephony is of increasing interest in both the telecommunications and Internet communities. The emergence of packet telephony will create new services, and presents an opportunity to rethink how conventional telephony services are implemented. In this paper, we present an architecture for Telephony Over Packet networkS (TOPS). TOPS allows users to(More)