PART FOUR in Software

Painting QR Code in Software PART FOUR

PART FOUR
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Problems to watch for in thinnet installations are intermittent connectors and Ts, connectors that may have pulled loose from the cable, and easily disconnected BNC-Ts The T may be disconnected from the workstation without disrupting the network, as long as both cables to the next adjacent workstations remain connected to the T In large installations, ground loop currents between areas of separate electrical service may cause network errors and even safety problems Ethernet Grounding Proper grounding of coaxial LAN cables is very important, both for safety and operational reasons Both types of Ethernet coax use unbalanced ground-referenced signaling That is, the LAN signal is applied to the center conductor and is referenced to a signal ground, connected to the shield Most people assume that a ground is a ground However, it is intended that this signal ground be independent of the earth ground (sometimes called chassis or safety ground) Unfortunately, the independent signal ground of the network and workstations can sometimes get interconnected with safety grounds If the signal ground on a cable and the chassis ground are not at the same electrical potential, significant signal distortion and even potentially lethal voltage differences can result Grounding is illustrated in Fig B5 The Ethernet specification calls for the trunk cable to be grounded at each wiring closet or thinnet cable to be connected to earth ground at one end (not at both ends) In addition, you should ensure that the building electrical system is properly bonded and grounded together, preferably at the one point where the power entry to the building is located All electrical distribution rooms in the building should be grounded back to the same entry point, as should all power transformers This is clearly an area for an experienced electrician, but as the network manager or contractor, you should know how to assess a proper building ground system EIA/TIA-607 gives extensive information on providing proper building grounding and bonding
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Coax Connectors
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Coax connectors have been used for LAN connections for a very long time The two most common LAN coax connectors are the BNC and the Type N connectors The Type N was used on the original thick Ethernet or thicknet cable that first introduced Ethernet to the world The connector is designed for the large cable diameter of coax cables such as that used for thicknet The Type N is shown in Fig B6 Type N connectors are expensive and bulky, but they are commonly available and are very reliable The
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APPENDIX B
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Wiring closet
Cable shield bonded to ground
Thicknet trunk cable
etc
Building ground
Bonding conductor between floors
Thinnet grounding
Thinnet cable segment 50 W 50 W
Bond to building ground Building ground For best performance, thinnet is grounded only at one end of the cable segment, not at intermediate points such as other BNC-Ts However, building and electrical codes may require bonding on each floor or wiring closet Bonding is always recommended at any building cable entrance
FIGURE B5 Typical grounding recommendations for coaxial Ethernet cabling
connectors are designed for use at many times the frequencies of Ethernet LANs, so their use in networks is no problem The use of thicknet cable and the corresponding Type N connector has decreased greatly with the advent of thinnet cabling and its BNC connectors BNC coax connectors are smaller, less expensive connectors compared to the Type N BNC connectors are used with thin Ethernet or thinnet cable that was introduced during the 1980s as a cheaper alternative to thicknet The BNC connector is also used for ARCnet coax connections The typical measurements to prepare a coax cable for BNC termination are shown in Fig B7 BNC connectors are available in two- and three-piece constructions that are designed for termination using screw-on, crimp-on, or solder assembly The crimp-on style is the most popular for field termination of LAN cables The assembly process is as follows The crimp-on sleeve (of a three-piece connector) is placed over the end of the coax The coax cable is stripped in the manner shown
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