Download Communications Network Test & Measurement Handbook by Clyde F. Coombs, Catherine Ann Coombs PDF

By Clyde F. Coombs, Catherine Ann Coombs

As electronic communications networks develop in use and measurement in the course of the global, the necessity for exact, trustworthy try out and dimension methods has elevated drastically. This specific guide offers the single complete assurance of all of the methodologies, info, and reference fabric essential to grasp community instrumentation. during this unmarried encyclopedic source, engineers will detect the best way to follow the entire try out, dimension, and tracking instruments severe to community functionality. The luck of this richly illustrated instruction manual is additional guaranteed by means of its authorship--Clyde Coombs is the preeminent editor of electronics handbooks, with a 30 12 months music checklist of top dealers.

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Troubleshooting LANs. ) Minoli, Daniel. Enterprise Networking: Fractional T1 to SONET, Frame Relay to BISDN. ) Naugle, Matthew G. Network Protocol Handbook. ) Perlman, Radia. Interconnections: Bridges and Routers. ) Smythe, Colin. Internetworking: Designing the Right Architectures. com) Copyright © 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. 1 The Existing Telecommunications Network Telecommunications networks have existed for more than 100 years, but the rate of change has accelerated since the 1970s with the introduction of semiconductor technology and computers.

The local loops, which can be analog or digital, connect subscribers to the Central Office, where local switching occurs. Higher levels of switching occur in trunk, or long-haul, networks. Trunk switches are fully interconnected by lightwave or microwave transmission systems. Traffic in the trunk networks is more concentrated than that in the local exchanges. Typically there are more than ten times as many local switches as trunk switches (a figure that also indicates the amount of telecommunications traffic that is completed within the local exchange area).

These take a high-speed network and split it into a number of lower stream speeds for transport across the WAN. These streams are then reassembled at the destination location. This technique may be used if high-speed WANs are not available in a given location. Modems. Modems today have become familiar devices due to the explosion of Internet access by PCs. There are many speeds and standards from which to choose. There is a de facto standard command set to control them. They can be purchased with many features, such as dial-back security features and data compression.

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