Phillip T. Conrad

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— The reliable server pooling (RSP) allows a pool of redundant information sources to be viewed as a single transport endpoint, and therefore is able to provide persistent connections and balanced traffic for different applications. The IETF RSerPool Working Group has proposed an architecture to implement the RSP, which defines an overlay network providing(More)
Motivated by m ultimedia and perhaps other applications, this paper investigates a Partial Order Connection POC serviceeprotocol. Unlike classic transport services that deliver objects either in the exact order transmitted or according to no particular order, POC provides a partial order service; that is, a service that requires some, but not all objects to(More)
The Stream Control Transmission Protocol (SCTP) is a new Internet standards track transport layer protocol. SCTP was designed to transport PSTN signaling messages over IP networks, but SCTP is also capable of serving as a generalized transport protocol. As such, SCTP provides an alternative to the traditional transport protocols, TCP and UDP, that may be(More)
This paper analytically studies retransmission-based p artially reliable transport service. Results show that partially reliable transport service p r ovides increasingly higher throughput and lower delay than reliable transport service as an application's loss tolerance increases and as the underlying network service gets more lossy. Also, to some degree,(More)
Transport layer protocols provide for end-to-end communication between two or more hosts. This paper presents a tutorial on transport layer concepts and terminology, and a survey of transport layer services and protocols. The transport layer protocol TCP is used as a reference point, and compared and contrasted with nineteen other protocols designed over(More)
The Stream Control Transmission Protocol (SCTP) is a new Internet standards track transport layer protocol. SCTP was originally designed to transport PSTN sig-naling messages over IP networks, but is also capable of serving as a general purpose transport protocol. As such, SCTP provides an alternative that may be better able to satisfy the requirements of(More)
We i n vestigate the beneets of using a partially-ordereddpartially-reliable POOPR transport service for multi-media document retrieval over the Internet by implementing a prototype system. We i n troduce PMSL, a document speciication language combining aspects of Little and Ghafoor's OCPN with features for graceful degradation. We then show that for(More)
Traditional image compression techniques seek the smallest possible le size for a given level of image quality. By contrast, network-conscious image compression techniques take into account the fact that a compressed image will be transmitted over a network that may lose and reorder packets. We describe GIFNCa, a network-conscious revision of the popular(More)
This paper presents an analytic model for investigating the throughput, delay and buuer utilization characteristics of partially ordered transport services. We analyze the eeects of packet and ack losses as well as applications' order requirements on overall system performance. The analytic model is veriied by comparing its results against those of an OPNET(More)
We apply the concept of network-consciousness to image compression, an approach that does not simply optimize compression, but which optimizes overall performance when compressed images are transmitted over a lossy packet-switched network such as the Internet. Using an Application Level Framing philosophy, an image is compressed into path MTU-size(More)