A Beginning in Java

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The differentiated services architecture is still in the early stages of its development and is rapidly evolving RFC's 2474 and 2475 [RFC1474], [RFC2475] define the fundamental framework of the diffserv architecture but themselves are likely to evolve as well The AF and EF PHB's discussed above have yet to enter the RFC standards track The ways in which PHB's, edge functionality, and traffic profiles can be combined to provide an end-to-end services, such as a virtual leased line service [Nicols 1998] or an Olympic-like gold/silver/bronze service [Heinanen 1999], are still under investigation In our discussion above, we have assumed that the DS architecture is deployed within a single adminstrative domain The (typical) case where an end-to-end service must be fashioned from a connection that crosses several administrative domains, and through non-DS capable routers, pose additional challenges beyond those described above
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References
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[Diffserv 1999] The IETF Differentiated Services Working Group homepage, http://wwwietforg/html charters/diffserv-charterhtml [Heinanen 1999] Juha Heinanen, Fred Baker, Walter Weiss, John Wroclawski, "Assured Forwarding
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Differentiated Services
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PHB Group", Internet Draft <draft-ietf-diffserv-af-04txt> , January 1999 [Jacobson 1999] V Jacobson, Kathleen Nichols, Kedernath Poduri, "An Expedited Forwarding PHB", Internet Draft <draft-ietf-diffserv-phb-ef-02txt> Feb 1999 [Nicols 1998] K Nicols, V Jacobson, L Zhang, "A Two Bit Differentiated Services Architecture for the Internet" unpublished draft [RFC 2474] K Nicols, S Blake, F Baker, D Black, "Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers", RFC 2474, December 1998 [RFC 2475] S Blake, D Black, M Carlson, E Davies, Z Wang, W Weiss, "An Architecture for Differentiated Services", RFC 2475, Dec 1998 [Thomson 1997] K Thomson, G Miller, R Wilder, "Wide Area Traffic Patterns and Characteristics," IEEE Network Magazine, Dec 1997 [Zhang 1998] Lixia Zhang, R Yavatkar, Fred Baker, Peter Ford, Kathleen Nichols, M Speer, Y Bernet, "A Framework for Use of RSVP with Diff-serv Networks", <draft-ietf-diffserv-rsvp-01txt> , 11/20/1998
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Multimedia networking is perhaps the most exciting development in the Internet today People throughout the world are spending less time in front their radios and televisions and are instead turning to the Internet to receive audio and video emissions, both live and prerecorded As high-speed access penetrates more residences, this trend will continue -- couch potatoes throughout the world will access their favorite video programs through the Internet rather then through the traditional microwave and satellite channels In addition to audio and video distribution, the Internet is also being used to transport phone calls In fact, over the next ten years the Internet mayl render the traditional circuit-switched telephone system obsolete in many countries The Internet will not only provide phone service for less money, but will also provide numerous value-added services, such as video conferencing, online directory services, and voice messaging services In Section 61 we classified multimedia applications into three categories: streaming stored audio and video; one-to-many transmission of real-time audio and video; and real-time interactive audio and video We emphasized that multimedia applications are delay sensitive and loss tolerant, which is very different from static-content applications, which are delay tolerant and loss intolerant We also discussed some of the hurdles that today's best-effort Internet places before multimedia applications We surveyed several proposals to overcome these hurdles, including simply improving the existing networking infrastructure (by adding more bandwidth, more network caches, and deploying multicast), adding functionality to the Internet so that applications can reserve end-to-end resources (and so that the network can honor these reservations), and finally introducing service classes to provide service differentiation In Sections 62-64 we examined architectures and mechanisms for multimedia networking in a besteffort network In Section 62 we surveyed several architectures for streaming stored audio and video We discussed user interaction -- such as pause/resume, repositioning, and visual fast forward -- and provided an introduction to RTSP, a protocol that provides client-server interaction to streaming applications In Section 63 we examined how interactive real-time applications can be designed to run over a best effort network We saw how a combination of client buffers, packet sequence numbers and timestamps can greatly alleviate the effects of network induced jitter We also studied how forward error correction and packet interleaving can improve user perceived performance when a fraction of the packets are lost or are significantly delayed In Section 64 we explored media chunk encapsulation, and we investigated in some detail one of the more important standards for media encapsulation, namely, RTP We also looked at how RTP fits into the emerging H323 architecture for interactive real-time conferencing Sections 65-69 looked at how the Internet can evolve to provide guaranteed QoS to its applications In Section 65 we identified several principles for providing QoS to multimedia applications These principles include packet marking and classification, isolation of packet flows, efficient use of resources, and call admission In Section 66 we surveyed a variety scheduling policies and policing mechanisms that can provide the foundation of a QoS networking architecture The scheduling policies include
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