000			03758cam a22003017a 4500
001			vtls000003689
003			VRT
005			20250102224921.0
008			081228s2005 njua f|b 001 0 eng d
010			_a2005-924225
020			_a0131487256 (pbk.)
039		9	_a201402040118 _bVLOAD _c201006090803 _dmalmash _c200812280850 _dvenkatrajand _c200812280849 _dvenkatrajand _y200812280847 _zvenkatrajand
050	0	0	_aTK5101 _b.D54 2005
082	0	4	_a384 _222
100	1		_aDodd, Annabel Z. _927790
245	1	4	_aThe Essential Guide to Telecommunications / _cAnnabel Z. Dodd.
250			_a4th ed.
260			_aUpper Saddle River, N.J. : _bPrentice Hall PTR, _cc2005.
300			_axxii, 594 p. : _bill. ; _c24 cm.
490	1		_aEssential guide series
500			_aPrevious ed.: 2002.
504			_aIncludes bibliographical references (p. 551) and index.
505			_aPreface Acknowledgments About the Author I. FUNDAMENTALS AND VOICE OVER IP. 1. Basic Concepts. The Transition to Digital Analog Signals-Slower, More Prone to Errors Digital Signals Adding Meaning to Signals-Codes and Bits A Byte = A Character Baud Rate Versus Bits per Second-Electrical Signal Rates Versus Amount of Information Sent Codes-Adding Meaning to Bits Measuring Speed and Capacity Broadband Service-Multiple Data Streams Improving Utilization-Compression and Multiplexing Compression-Shrinking Data to Send More Information Multiplexing-Let's Share Interoperability-Protocols and Architectures Protocols-A Common Set of Rules Architectures-How Devices Fit Together in a Network Types of Networks-LANs, MANs, and WANs LANs-Local Area Networks LAN and WAN Devices-Higher Speeds, Lower Prices Home LANs-Sharing High-Speed Internet Access MANs-Metropolitan Area Networks ... Links Within Cities WANs-Wide Area Networks ... Links Between Cities Higher Speed Services for LAN Traffic Carrier and Internet Service Provider Networks Appendix 2. VoIP Systems, Circuit Switched PBXs and Cabling. Telephone Systems-Voice over IP, PBXs, and Centrex Systems What Is a Private Branch Exchange (PBX)? IP PBXs for the Enterprise Impetus for Change Architecture of IP-Based Systems ... How the Pieces Fit Together Voice Quality and Security Barriers to Acceptance of Voice over IP Endpoints-IP Telephones Connected to Layer 2 Switches PBX Trunks-Switch-to-Switch Connectivity Demarcation-The Location at Which Telcos Wire Trunks Circuit Switched PBXs-Proprietary Platforms Centrex-Telephone Company Supplied Service IP Centrex-Phone Companies Hosting Voice Over IP Direct Inward Dialing-Bypassing the Operator for Incoming Calls Key Systems-Multi-featured for Smaller Organizations Hybrid PBX/Key Systems Wireless Options for PBXs Advanced Applications for Telephone Systems Call Accounting-Billing Internal Departments Call Detail Recording for Carriers-Ge
520			_aLeading consultant Annabel Dodd presents easy-to-understand, insightful explanations of today's key trends and technologies: Industry Players and Trends, Broadband, VoIP, Wi-Fi and WiMax, 3G Mobile Networks, and Multimedia Networks. Previous editions have helped professionals worldwide understand the major changes transforming the telecommunications industry. In the past four years, the telecommunications industry has undergone major changes. This is the complete guide to the new realities of telecommunications. The new edition reflects all of today's most critical issues, trends, and technologies. In addition to providing crucial insights into the fast-changing competitive landscape, Dodd provides important information about the structure of, and key players in, the industry.
650		0	_aTelecommunication. _918572
830		0	_aEssential guide series (Prentice-Hall, inc.) _949532
942			_2lcc _n0 _cBK
999			_c23486 _d23486