The convergence of network computing and telecommunications
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1 The convergence of network computing and telecommunications David G. Messerschmitt University of California at Berkeley Copyright 1997, David G. Messerschmitt 3/5/97 1
2 Terminology Applications Services Video conferencing, voice and electronic mail, WWW browsing, etc. Audio, video, payment, directory, privacy keys, etc. Bitways ATM, IP, wireless, etc.. Realizing the Information Future: The Internet and Beyond, Nat. Res. Council Copyright 1997, David G. Messerschmitt 3/5/97 2
3 Telecommunications-computing confusion Infrastructure blurring Data, audio, video in ATM network Data, audio, video in desktop computer Applications blurring Home banking by DTMF and voice response Home banking by desktop computer and modem or Internet Copyright 1997, David G. Messerschmitt 3/5/97 3
4 Types of applications User-to-user User-to-information server User-to-user with information server Copyright 1997, David G. Messerschmitt 3/5/97 4
5 User-to-information server example World-wide web browser Copyright 1997, David G. Messerschmitt 3/5/97 5
6 User-to-user examples Shared whiteboard Shared editor Copyright 1997, David G. Messerschmitt 3/5/97 6
7 Taxonomy of networked applications Usertoinformation server Immediate Video on demand WWW browsing Deferred File transfer Usertouser Telephony Video conference Electronic mail Voice mail Copyright 1997, David G. Messerschmitt 3/5/97 7
8 Two architectures Client Peer Peer Client Server Peer Peer Client Peer Peer User-to-information server User-to-user User-to-user Copyright 1997, David G. Messerschmitt 3/5/97 8
9 Two architectures for user-to-user applications Computer worldview Client Client Server Telecom worldview Peer Peer Copyright 1997, David G. Messerschmitt 3/5/97 9
10 Vertical to horizontal integration Network/service/application Network/service/application Network/service/application Applications Services Bitways Copyright 1997, David G. Messerschmitt 3/5/97 10
11 Advantages of horizontal integration Services and bitway providers: Administration and economies of scale Independent application developer Economically significant market built on existing infrastructure User Multimedia applications Diversity of applications Single services and bitway access provider Copyright 1997, David G. Messerschmitt 3/5/97 11
12 The open horizontal interface Applications Operating system & telephone API Services Internet protocol (IP) & QoS Bitways Async. transfer mode (ATM) Copyright 1997, David G. Messerschmitt 3/5/97 12
13 More layers emerging Applications Application components Middleware services E.g. OpenDoc, ActiveX E.g. CORBA Network services Bitways Copyright 1997, David G. Messerschmitt 3/5/97 13
14 Information appliances Applications Application components Middleware services Network services Captures a turnkey stovepipe application snapshot in one easy-to-use product e.g. WebTV, Nokia Comunicator Bitways Copyright 1997, David G. Messerschmitt 3/5/97 14
15 Obstacles to innovation All users possessing the client application immediately benefit fully Clientserver Peer-topeer Users possessing the peer application benefit only to the extent that there are other peers with an interoperable application Network externality Copyright 1997, David G. Messerschmitt 3/5/97 15
16 Transportable computation Transport not only data, but also computation across the network Primary impacts: Scalability Interoperability Copyright 1997, David G. Messerschmitt 3/5/97 16
17 Network distribution Client Network Server Slow distribution is replaced by distribution of the client application over the network itself Client application repository Copyright 1997, David G. Messerschmitt 3/5/97 17
18 Virtual machine interface Applications WWW browser Virtual machine Java bytecode interpreter Telescript Operating system UNIX, MacOS, Win95 Copyright 1997, David G. Messerschmitt 3/5/97 18
19 Dynamic deployment: client-server Client Network Server Functionality is invoked during a session by dynamically distributing executable code during the session itself Client applet repository Copyright 1997, David G. Messerschmitt 3/5/97 19
20 Applet execution Source code Languages: Tcl Telescript Java Compiler Stored on server Platform-independent bytecode Dynamic deployment Bytecode virtual machine PC, Mac, PDA, telephone, etc Client Client Copyright 1997, David G. Messerschmitt 3/5/97 20
21 Example Java applet Nuclear reactor simulation Copyright 1997, David G. Messerschmitt 3/5/97 21
22 Advantages Client-server: No functional advantage over, say X Reduced latency Scalability Peer-to-peer Bypasses network externality Copyright 1997, David G. Messerschmitt 3/5/97 22
23 Dynamic deployment: peer-to-peer Peer Network Peer Network externality problem is avoided by deploying the peer application during establishment, or dynamically during the session Peer applet repository Copyright 1997, David G. Messerschmitt 3/5/97 23
24 Java-to-Share Helper application for standard Java- enabled WWW browser Turns client-server WWW browser into platform for user-to-user applications in peer-to-peer architecture Peers need not have application software in advance Copyright 1997, David G. Messerschmitt 3/5/97 24
25 Java-to-Share Netscape browser Netscape browser Java virtual machine Java applet Java applets Java virtual machine Http server Copyright 1997, David G. Messerschmitt 3/5/97 25
26 Endpoint: complete convergence Client/peer Repository Server Repository Collaboration context Client/peer Repository Information context Client/peer Repository Server Repository Copyright 1997, David G. Messerschmitt 3/5/97 26
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