By David Barnett, David Groth, Jim McBee
The top-selling e-book on secure and potent cabling, recommended through the digital Technician's organization foreign, has been up to date to carry the most up-tp-date and trustworthy info. during this definitive consultant, cable installers, community directors, specialists, and technicians get the entire the most important cabling info they want, together with installer and troubleshooting counsel and improved insurance on fiber optic cables. A 32-page colour insert deals fast identity of connectors and cables, in addition to seller details and suggestions. due to the fact right cable utilization is helping construct trustworthy, excessive functionality networks and wrong cable utilization can doom a community, do not fail to spot this crucial source.
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11 in. during test. , may only be used within a single floor. S. and Canadian standards. OFN OFC CM CATV General PurposeFlame spread limited to 4 ft, 11 in during test. , may only be used within a single floor. Not applicable CMX CATVX Limited Use For residential use but can only be installed in one- and two-family (duplex) housing units. Often co-rated with optional UL requirements for limited outdoor use. OFN = Optical fiber, nonconductive (no metallic elements in the cable) OFC = Optical fiber, conductive (contains a metallic shield for mechanical protection) 3 CM = Communications cable 4 MP = Multipurpose cable (can be used as a communication cable or a low-voltage signaling cable per NEC Article 725) 1 2 24 Chapter 1 • Introduction to Data Cabling WARNING The 2002 edition of the NEC requires that the accessible portion of all abandoned communications cables in plenums and risers be removed when installing new cabling.
KEY TERM application Often you will see the term application used when referring to cabling. If you are like me, you think of an application as a software program that runs on your computer. However, when discussing cabling infrastructures, an application is the technology that will take advantage of the cabling system. Applications include telephone systems (analog voice and digital voice), Ethernet, Token Ring, ATM, ISDN, and RS-232. Proprietary Cabling Is a Thing of the Past The company discussed in the last section had at least seven different types of cables running through the walls, floors, and ceilings.
In addition to being vulnerable to outside interference from electric motors, fluorescent lighting, elevators, cellular phones, copiers, and microwave ovens, faulty cabling can lead to intermittent problems for other reasons. These reasons usually pertain to substandard components (patch panels, connectors, and cable) and poor installation techniques, and they can subtly cause dropped or incomplete packets. These lost packets cause the network adapters to have to time out and retransmit the data.