G attenuation interference number of receivers in

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Unformatted text preview: interference number of receivers in guided media more receivers introduces more attenuation Electromagnetic Spectrum Electromagnetic Transmission Characteristics of Guided Media Frequency Range Typical Attenuation Typical Delay Repeater Spacing Twisted pair (with loading) 0 to 3.5 kHz 0.2 dB/km @ 1 kHz 50 µs/km 2 km Twisted pairs (multi­pair cables) Coaxial cable 0 to 1 MHz 0.7 dB/km @ 1 kHz 5 µs/km 2 km 0 to 500 MHz 7 dB/km @ 10 MHz 4 µs/km 1 to 9 km Optical fiber 186 to 370 THz 0.2 to 0.5 dB/km 5 µs/km 40 km Twisted Pair Twisted Twisted Pair - Transmission Characteristics Characteristics analog analog digital needs amplifiers every 5km to 6km can use either analog or digital signals needs a repeater every 2-3km limited distance limited bandwidth (1MHz) limited data rate (100MHz) susceptible to interference and noise Unshielded vs Shielded TP Unshielded unshielded Twisted Pair (UTP) shielded Twisted Pair (STP) ordinary telephone wire cheapest easiest to install suffers from external EM interference metal braid or sheathing that reduces interference more expensive harder to handle (thick, heavy) in a variety of categories - see EIA-568 UTP Categories UTP Category 3 Class C Category 5 Class D Category 5E Category 6 Class E Category 7 Class F Bandwidth 16 MHz 100 MHz 1...
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