06-PL-PhysicalMedia

06-PL-PhysicalMedia - PhysicalMedia 1 PhysicalMedia

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1 Physical Media
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2 Physical Media physical link: guided media:   signals propagate in solid media: copper, coax, fiber unguided media:   signals propagate freely, e.g., radio signals
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3 Common Cabling Copper Twisted Pair Unshielded (UTP) CAT-1, CAT-2, CAT-3, CAT-4, CAT-5, CAT-5e Shielded (STP) Coaxial Cable Cable TV cable Fiber Single-mode Multi-mode
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4 Twisted Pair Most common LAN interconnection Multiple pairs of twisted wires Twisting to eliminate interference  More twisting = Higher bandwidth, cost Standards specify twisting, resistance, and maximum  cable length for use with particular link layer
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5 Twisted Pair 5 categories Category 1 Voice only (telephone wire) Category 2 Data to 4Mbs (LocalTalk) Category 3 Data to 10Mbs (Ethernet) Category 4 Data to 20Mbs (16Mbs Token Ring)
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06-PL-PhysicalMedia - PhysicalMedia 1 PhysicalMedia

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