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LAN Wire Management
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FIGURE 143 Different types of backbones used in Ethernet networks
individually at each hub that is to be connected to the backbone In some LAN backbone topologies, a backbone ring must be formed, linking each telecommunications room Token-Ring and FDDI are examples of this backbone ring method Unlike the telephone scenario, the LAN backbone connections do not simply combine individual station cables into larger multiplier cables LAN backbones usually require one backbone connection for each group of hubbed workstations that
Telecommunications Rooms and Wire Management
is to be connected Additional backbone cables may be run to provide backup for the primary cables or to provide closure of a ring Backup cables or cables to complete a ring are an integral part of the backbone hierarchy By the way, nothing in this implies that a backbone is either fiber optic or copper, as either one may serve your needs well Keep in mind that the allowable distances between closets in TIA-569-B exceed the distances for copper wire 10/100/1000BaseT or Token-Ring, set without reference to a specific LAN topology However, the use of fiber-optic cable can extend your cables to the limit of the TIA standard
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Testing and Certifying LAN Wiring
Highlights
Certifying cable and connecting hardware Scanner performance Cable plant certification Testing methods Test equipment Analog versus digital testers
Copyright 2006 by James Trulove Click here for terms of use
PART THREE
LAN Wire Management
The testing of installed cable is a critical part of the process of creating a successful structured cabling system The major reason to specify a standards-based LAN wiring scheme is to ensure that your installed cable will meet the needed level of performance for your intended use There are three basic requirements for providing a cabling system that will meet TIA-568-C performance standards First, you must design a structured cable plant that will meet the desired performance criteria when the other two requirements are met Second, you must use cable and connecting components that are certified to the proper level of performance Third, you must employ proper installation methods so that the performance potentials of the cabling and components are achieved This is a long way of saying that a well-designed LAN wiring system, using the proper cable and connectors, and installed with good workmanship, will operate at the expected level of performance Previous chapters in this book have described all of these key concepts, individually This chapter will explore the ways in which you can verify the proper operation of your installed cable system We will discuss some of the ways in which cable and components are certified to a particular level of performance by their manufacturers In addition, we will see how you can perform inspection and testing to ensure that your installed cable plant meets the required performance levels Next, we will talk about the test equipment you will need to verify your installation Finally, we will show how to use that test equipment to do cable performance testing and link certification
Certifying Cable and Connecting Hardware
The primary standard for LAN performance certification in the United States and many other countries is TIA-568 The full name of the latest version of the standard is TIA-658-C, Commercial Building Telecommunications Wiring Standard Several other standards bodies, including the Canadian Standards Association (CSA) and the International Organization for Standardization (ISO), have similar or coordinated standards, such as CSA-T529 and ISO/IEC IS-11801 As cabling performance levels increased, the TIA realized that additional information and guidelines were necessary to ensure a properly functioning cable link It was important to identify those factors that allow an installed cable link to meet the desired category of performance Likewise, testing techniques were needed to certify the performance levels of individual cabling components, such as connecting hardware and even patch cords The TIA has continually issued documents called Telecommunications Systems Bulletins (TSBs) to provide supplementary information and procedures TSBs have provided the critical testing methods and standards to cover performance testing of installed cable A very key early supplement, TSB-67 1995, Transmission Performance Specifications for Field Testing of Unshielded Twisted-
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