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Table A1 in Appendix A shows a comparison of wire gauges to physical size Smaller diameter conductors correspond to larger wire gauge numbers Thus, AWG26 is smaller than AWG-19 Telephone outside plant cabling is typically 24- or 26gauge, although in rural areas, 19- or 22-gauge may be used The larger diameter wires have more physical strength, which is an advantage for wires that must be run between distant supports Larger wires also have a lower resistance per unit length, which reduces resistance to direct current and lessens attenuation to alternating frequencies, such as voice (At LAN frequencies, the capacitance is the primary contributor to attenuation) The greater copper content of larger wire sizes also increases the cost of the wire At higher frequencies, such as those of a high-speed LAN, signal current concentrates at the outer diameter of the conductor, a phenomenon known as skin effect In a stranded conductor, the outer skin is ill-defined, because of the many conducting strands that make up the wire, and attenuation is increased For that reason, standards typically limit the length of stranded wire that is allowed in a channel Solid copper wire must be used for the horizontal cable portion of the channel Stranded wire may be used for user and patch cords, where a 20% increase in attenuation is allowed The common wire gauge that is specified by standards for LAN wiring use is 24-gauge solid copper wire This wire size provides a good compromise between attenuation and cost It is also an easy size to work with UTP/STP Electrical Characteristics Twisted-pair wire, like other types of transmission lines, has a characteristic impedance This impedance is a result of the dielectric properties of the insulation and the closeness of the conductors The insulation s dielectric properties are a function of the type of material used A variety of characteristic impedance values are available The wire used for LAN twisted-pair wiring has a characteristic impedance of 100 ohms, 120 ohms, or 150 ohms Most of the UTP cable you will deal with will be rated at 100 ohms, as that is the standard for UTP wire in most parts of the world Shielded or screen twisted-pair wire (STP) generally has a characteristic impedance of either 100 or 150 ohms Newer STP constructions that are in wide use in Europe are of the 100 ohm variety TIA/EIA-568-C specifies this 100 ohm construction for STP applications The specific type of 150 ohm STP that was defined in TIA/EIA-568-A is called STP-A to differentiate it from the other types of STP cable This STP-A is often found in Token-Ring installations that use the IBM cabling system, as covered in 3 To interconnect between 100-ohm and 150-ohm wire, you must use a
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balun transformer to minimize unwanted reflection and power loss caused by the impedance mismatch If a network with 100-ohm station cable connects to user equipment with 150ohm interfaces, a special cable with a built-in balun, called a media adapter, must be used for proper operation STP-A is typically rated at 300 MHz, in contrast to the 100 MHz rating of normal Category 5e and lower cable If you are familiar with telephone circuits, you may know that such circuits are generally characterized for operation at 600 or 900 ohms This load impedance is designed to minimize current flow to subscriber telephone instruments, in addition to other factors It is not representative of the characteristic impedance of the wire pair, which is not as significant at voice frequencies Why is the characteristic impedance important to LAN wiring The reason is twofold First, the maximum amount of power is transferred when the impedances of the source and load are matched A greater power transfer extends the usable cable distance Second, mismatches cause reflections of the signal, which can deteriorate the quality of the received LAN signal and cause unwanted emissions At high LAN data rates and long cable distances, this might become critically important to performance As we will see later, a cable s characteristic impedance may vary over the frequency range of the LAN signal The standards specify a maximum variation that must be met for the cable to meet minimum performance criteria The resistance and capacitance of a twisted-pair cable cause an attenuation of the LAN signal that is proportional to length of cable This signal attenuation is expressed in decibels (dB), indicates a power ratio, 10-log (Pin/Pout), of the input versus output power expressed as a logarithm The typical attenuation of a cable is given in dB per foot or meter so that you can calculate the total attenuation of a cable run by multiplying its per unit value by the total length Fortunately, a standards-compliant installation will ensure that the total attenuation (including cable and connectors) is within the maximum limits necessary for proper LAN operation The attenuation of a typical cable run is enough below the maximum allowed that an attenuation measurement usually reveals bad connections or partial cable breaks, rather than cable deficiencies The capacitance of twisted-pair wiring is the factor that causes attenuation to increase steadily with frequency The attenuation caused by capacitance is proportional to 1/(2 f) Thus, the greater the frequency, the less the parallel impedance between the wires, and the more the signal attenuation Although this attenuation factor is linear, in practice, twisted-pair cables exhibit peaks and valleys that can affect transmission performance at specific frequencies For this reason, the new performance measurement standards for installed cable require numerous discrete measurements over the entire frequency range of a cable category
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