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First Things First
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SG 10 Languages and general software aspects for telecommunication systems SG 11 Signaling requirements and protocols SG 12 End-to-end transmission performance of networks and terminals SG 13 Multi-protocol and IP-based networks and their internetworking SG 15 Optical and other transport networks SG 16 Multimedia services, systems, and terminals SSG Special Study Group IMT-2000 and beyond
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The standards are published in a series of alphabetically arranged documents, available as books, online resources, and CDs. They are functionally arranged according to the alphabetical designator of the standard as follows: A B C E F Organization of the work of ITU-T Means of expression: definitions, symbols, and classification General telecommunication statistics Overall network operation, telephone service, service operation, and human factors Non-telephone telecommunication services
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G Transmission systems and media, digital systems, and networks H Audiovisual and multimedia systems I J Integrated services digital network Transmission of television, sound programs, and other multimedia signals Construction, installation, and protection of cables and other elements of outside plant
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
First Things First
1
M TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile, and leased circuits N Maintenance: international sound program and television transmission circuits O Specifications of measuring equipment P Telephone transmission quality, telephone installations, local line networks
Q Switching and signaling R Telegraph transmission S T V X Y Z Telegraph services terminal equipment Terminals for telematic services Data communication over the telephone network Data networks and open-system communication Global information infrastructure and Internet protocol aspects Languages and general software aspects for telecommunication systems
U Telegraph switching
Within each letter designator can be found specific, numbered recommendations. For example, recommendation number 25 in the X book contains the specifications for transporting packet-based data across a public network operating in packet mode. This, of course, is the nowfamous X.25 packet switching standard. Similarly, Q.931 provides the standard for signaling in ISDN networks, and so on. The documents are remarkably easy to read and contain vast amounts of information. I am always surprised to discover how many people who work in telecommunications have never read the ITU standards. Take this, then, as my recommendation: Find some of them and flip through them. They can be very useful. I spent some time writing about the ITU and its standards activities simply to explain the vagaries of the process (one of my favorite telecom jokes goes like this: There are two things you never want to watch being made. One of them is sausage; the other is standards. ) and the role of these bodies. The ITU is representative of the manner in which all standards are developed, although the frequency of update, the cycle time, the relative levels of involvement of the various players, and the breadth of coverage of the documents vary dramatically.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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First Things First
The Network
For years now, communications networks have been functionally depicted as shown in Figure 1-5: a big, fluffy, opaque cloud, into which disappear lines representing circuits that magically reappear on the other side of the cloud. I m not sure why we use clouds to represent networks; knowing what I know about their complex innards and how they work, a hairball would be a far more accurate representation. In truth, clouds are pretty good representations of networks from the point of view of the customers that use them. Internally, networks are remarkably complex assemblages of hardware and software as you will see in the chapter on telephony. Functionally, however, they are straightforward: customer traffic goes into the network on the Gozinta; the traffic then emerges, unchanged, on the Gozouta. How it happens is unimportant to the customer; all they care about is that the network receives, interprets, transports, and delivers their voice/video/images/ data/music to the destination in a correct, timely, and cost-effective fashion. Later in the book we will discuss the various technologies that live within the network, but for now suffice it to say that its responsibilities fall into two categories: access and transport, as illustrated in Figure 1-6.
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