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As IP technologies providing both tremendous capacity and the ability to establish dynamic secure associations between endpoints emerge, Virtual Private Networks (VPNs) are going through dramatic growth. The number of endpoints per VPN is growing and the communication pattern between endpoints is becoming increasingly hard to forecast. Consequently, users(More)
In this paper we show that modulating the source rate of a video encoder based on feedback information from the network results in graceful degradation in picture quality during periods of congestion. Such source rate modulation techniques have been used in the past in designing video encoders used to generate data at a fixed rate. In such constant bit rate(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 Te-lephony Over Packet networkS (TOPS). TOPS allows users to(More)
|We propose a scheme for transmission of variable-bit-rate compressed video for interactive applications, using the Explicit-Rate congestion control mechanisms proposed for the Available Bit Rate (ABR) service in ATM networks. Compressed video is inherently bursty with rate uctua-tions over both short and long time scales. This source behavior can be(More)
As IP technologies providing both tremendous capacity and the ability to establish dynamic security associations between endpoints emerge, virtual private networks (VPNs) are going through dramatic growth. The number of endpoints per VPN is growing and the communication pattern between endpoints is becoming increasingly hard to predict. Consequently, users(More)
In this paper we examine the performance implications of providing reliability in conjunction with mul-ticast transport over a high speed wide area network. We use a block based acknowledgement and selective retransmission protocol to evaluate the impact of the loss rate and the multicast tree topology on the achievable throughput. Our results show that(More)
SWAN (Seamless Wireless ATM Network) is an experimental indoor wireless network that investigates the combination of wireless access with multimedia networked computing in an indoor setting. It is based on room-sized pico-cells and mobile multimedia end-points. It enables users carrying multimedia end-points such as PDAs, laptops, and portable multimedia(More)
The flow/congestion control scheme of TCP is based on the sliding window mechanism. As we demonstrate in this paper, the performance of this and other similar end-to-end flow control schemes deteriorates as networks move to the gigabit range. This has been the motivation for our search for a new flow and congestion control scheme. In this paper, we propose(More)