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2124 Coaxial cable
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Coaxial cable is a well-behaved medium for networking (Figure 214) The cable s impedance can accurately be controlled, usually to 50 , and it will carry very high frequencies Its primary disadvantages are that it is physically bulky (a single-conductor strand is about the same diameter as a four-pair UTP bundle), is more fragile, and is more expensive The current frequency limit for UTP is about 150 MHz, whereas coaxial cable will work well to several hundred megahertz over respectable distances Close attention must be paid to grounding the shield to satisfy a requirement by building codes[3] The measurements for coaxial cable are the same for twisted-pair cable, but crosstalk and wire mapping have no meaning in a coax environment
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Figure 214 Coaxial cable In its simplest form coaxial cable will have a single shield around a center conductor Multiple outer shields can be used for further improvement in field isolation and high-frequency performance (Courtesy Mohawk/CDT)
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Figure 215 Twinaxial cable Some grades of twinaxial cable might provide a twist in the two center conductors Twinax provides a high-quality transmission path, but at a relatively high cost
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2125 Other copper cable
As noted at the outset of this chapter, the two main types of other copper cable are twinaxial ( twinax ) and single-pair full-duplex Twinaxial copper cable Twinaxial cable is a legacy cable used primarily in mainframe computer rooms to connect the various peripherals (usually terminals) to the computer, front-end processor, or cluster controller (Figure 215) Twinax looks like coax except that it has two parallel conductors instead of one, somewhat like STP but with a single pair of wires embedded in the dielectric and supported by an outer shield It is relatively expensive and has not been specified for deployment by the LAN or WAN standards bodies It does an excellent job of providing for highspeed data connections and is found in proprietary installations
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Transmission Media Characteristics and Measurements Transmission Media Characteristics and Measurements 463
Single-pair full-duplex (POTS cable) This type of cable is UTP but with full-duplex (simultaneous transmit and receive) capability over a single pair of wires Referred to as POTS ( plain old telephone service ) cable, its use has been limited primarily to analog voice-band service applications Given that average consumers and small businesses have buildings wired with this cable for telephone service, the carrier companies have developed schemes to use this same installed cable for digital subscriber loop service This provides increased bandwidth without requiring the installation of new cable 213 Optical Fiber Media Fiber optic cable media are widely deployed in higher-rate (>100 Mbps) data communication channels, and also where long distances between repeaters are the norm The cable fibers, in addition to providing very wide bandwidth, are free from electromagnetic interference and offer high security against intrusion In its simplest form an optical fiber is a flexible glass filament that carries a modulated light signal (Note that the term light no longer means that the signal consists of visible light; it is a legacy term carried over from the early days of fiber optic transmission Today the term light means that a signal is present or the fiber is in service, while dark refers to a spare fiber that is not in service) Fiber optic signals are more commonly referred to by their wavelength, expressed in nanometers (nm) The longest visible wavelengths, at the bottom of the red portion of the spectrum, are in the 600 700 nm range Fiber optic signals normally are infrared; 900 and 1300 nm are the most common wavelengths This section provides a description of fiber optic media and will review the two most common types deployed in data communications, multimode and single-mode fiber For purposes of this discussion, the terms light and signal will be used interchangeably
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