Kotikalapudi Sriram

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This paper analyzes a model of a multiplexer for packetized voice and data. A major part of the analysis is devoted to characterizing the aggregate packet arrival process resulting from the superposition of separate voice streams. This is done via the index of dispersion for intervals (IDI), which describes the cumulative covariance among successive(More)
There are currently a large variety of wireless access networks, including the emerging Vehicular Ad hoc Networks (VANETs). A large variety of applications utilizing these networks will demand features such as real-time, high-availability and even instantaneous highbandwidth in some cases. Therefore, it is imperative for network service providers to make(More)
This paper investigates the packet delay variation and packet loss probabilities to be expected in typical applications of voice trunking using ATM adaptation layer type 2 (AAL2) and the consequences these may have, such as the need for sequence numbers in voice packet headers. Simulations have been run for the case of 32-kb/s ADPCM encoded voice across a(More)
One of the critical design issues in Optical Burst Switching (OBS) networks is finding ways to minimize burst dropping resulting from resource contention. The existing variants of the basic deflection routing schemes all lack the ability to determine the alternate route based on clear performance objectives. In this paper, we present Contention-Based(More)
We consider Medium Access Control (MAC) protocols in which minislots are used to request permission to transmit packets of information (voice, data, video, or multi-media) in the upstream channels, and the information is subsequently transmitted in packet time-slots allocated by a central controller. Such MAC protocols are currently being considered for(More)
Recent studies have shown that the superposition of packet sequences generated by packetized voice sources with speech detection exhibit high burstiness due to inherent correlations between successive interarrival times in the superposition stream. In a packet voice multiplexer without bit dropping, these correlations tend to cause significantly larger(More)
Optical burst switching (OBS) is a very promising switching technology for realization of an economical optical Internet. In OBS networks, when contention occurs at an intermediate switch, two or more bursts that are in contention can be lost because a forwarding path reservation is not made for a burst until a control message for the burst arrives. That is(More)
We present a detailed study of the potential impact of BGP peering session attacks and the resulting exploitation of Route Flap Damping (RFD) that cause network-wide routing disruptions. We consider canonical grid as well as down-sampled realistic Autonomous System (AS) topologies and address the impact of various typical service provider routing policies.(More)