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8/U, RG-11/U, RG-58A/U, RG-59/U, and RG-62/U The outer jacket of RG-8/U and RG-11/U is roughly 1/2 inch (127 mm), while RG-58A/U, 59/U, and 62/U are on the order of 1/4 inch (64 mm) Plenum versions of these cables are usually a little smaller The wire sizes of the center conductor and the diameter of the outer jacket (including dielectric and shield) are defined by the RG number and the insulation type You must specify whether you want connectors for PVC or plenum insulation types, since the cable dimensions are not the same Coax Electrical Characteristics Coax cables are available in a variety of standard characteristic impedances Because the primary use for coax is the transmission of RF signals, the coax impedances often reflect the needs of RF equipment These standard impedances are 50 ohms, 75 ohms, and 92 ohms The dimensions and properties of the center conductor, dielectric, and shield combine to define the coax cable s characteristic impedance The dielectric constant in flameresistant cable is very different from that of conventional polyethylene or foam dielectric cable It is for this reason that plenum cable typically has a smaller cable diameter The attenuation of coax cable is less than 15 dB per 100 ft at 10 MHz At 100 MHz, the typical attenuation is under 5 dB per 100 ft Obviously, the useful coax cable length is reduced as the frequency goes up Some types of networks base their maximum coax cable runs on the total allowable loss from end to end (the loss budget), while other types of networks have timing constraints that limit the usable distance As with other wiring types, the capacitance of the cable is the primary contributor to attenuation at higher frequencies Even so, coax has a greater maximum usable length than twisted pair For example, a 10 Mbps Ethernet segment can be 500 m (16405 ft) using thicknet and 185 m (607 ft) using thinnet (Note: Segment lengths in Ethernet are limited by attenuation and frequency-based signal distortion, while network span is limited by timing constraints) ARCnet, which runs at 25 Mbps, allows 2000 ft (610 m) for each coax leg with an active hub For comparison, twisted-pair wiring is limited to 100 m (328 ft) The standard coax dielectrics are polyethylene and PTFE or FEP, although several other materials are also used The loss characteristics of the dielectric material contribute to the loss at any given frequency Low-loss dielectric materials and constructions, such as foam or helical dielectrics, are available However, those low-loss cables are cost-prohibitive for normal LAN cable installations.

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Tools Soldering Technique The Connectors Type N Plugs and Jacks SMA Plugs and Jacks TNC Plugs and Jacks

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Coax Insulation The insulation in coax cables includes the jacket as well as the insulating dielectric that separates the center conductor and the shield The primary types of insulation materials used with coax are polyethylene, polypropylene, various synthetic rubber compounds, polyvinyl chloride (PVC), and fluorocarbon polymers such as polytetrafluoroethylene (PTFE), fluorinated ethylene-propylene (FEP), and ethylene-chlorotrifluorethylene (ECTFE or HALAR ) Nonplenum coax cables generally use polyethylene as the dielectric that surrounds the center conductor, and use noncontaminating synthetic resin for the outer jacket Plenum-rated coax cables use a PTFE dielectric (such as Teflon ) or FEP and a similar outer jacket Coax Color Coding and Marking The most common color for nonplenum coax cable is black Most of the nonplenum cable that is used for LAN wiring will have a black synthetic rubber or PVC outer jacket with white markings Plenum cable usually has a white or translucent jacket with black markings A notable exception to this rule is classic thick Ethernet (10Base5) cable Thick Ethernet cable is usually a very bright color, such as yellow Coax cable should be marked in a similar manner as twisted pair The cable will generally have a manufacturer s name and part number, the UL/NEC class or use marking, and the appropriate RG number It may also have EIA/TIA markings or IEEE 8023 markings Coax use ratings are covered in NEC Articles 800 and 820 If you use RG-58 type cable for thinnet, you should be aware that some of this type of cable does not meet 8023 specifications and may not be usable at the maximum length for thinnet You should be sure to specify RG-58A/U that is certified for 8023 use EIA/TIA-568 1991 contains specifications for coax, and those markings may be on the cable jacket Ethernet trunk cable (thicknet) will have marking bands every 25 m to indicate locations for transceiver tap installation Coax Shielding A concentric shield conductor surrounds the center conductor and dielectric insulation in a coax cable This outer shielding layer causes the electrical and magnetic fields to be contained within the cable and shields the center conductor from fields outside the cable Two types of shielding are generally used in coax cables: foil and braid The foil shield, sometimes called an overall foil shield, is a very thin metallic foil that.

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