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© ExplorNet’s Centers for Quality Teaching and Learning 1 Differentiate among various types of network cables and connectors. Objective 109.03 Course Weight 2%
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© ExplorNet’s Centers for Quality Teaching and Learning 2 Twisted Pair: Interior Most commonly used for network and telephone wiring. Named after the four twisted pairs inside. Twisted at different frequencies to reduce signal interference.
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© ExplorNet’s Centers for Quality Teaching and Learning 3 Twisted Pair: Interior Unshielded – wires twisted inside the sheath, no extra protection. Shielded – wires wrapped in metal coating to reduce interference from EMI and RFI. Individual pairs can be wrapped or the inside of the sheath can be wrapped. The more shielding, the more expensive the wire.
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© ExplorNet’s Centers for Quality Teaching and Learning 4 Twisted Pair: Interior
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© ExplorNet’s Centers for Quality Teaching and Learning 5 Twisted Pair: Exterior Polyvinyl Chloride(PVC) sheathing: Used extensively because of its low cost and good overall properties. High physical strength Good moisture resistance Adequate oil resistance Good flame resistance Excellent resistance to weathering and to soil environments Most commonly used sheath material for low voltage (LV) cables.
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© ExplorNet’s Centers for Quality Teaching and Learning 6 Twisted Pair: Exterior Problems with PVC cabling: Contains halogens which produces thick, black toxic smoke when burnt. This is especially dangerous in plenum space. Plenum Space An air-filled space in a structure; especially one that receives air from a blower for distribution (as in a ventilation system). Solution: Plenum rated cable Different sheath material = safe for use in plenum space but higher cost.
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© ExplorNet’s Centers for Quality Teaching and Learning 7 Twisted Pair: Connecting Registered Jack RJ-45 8 pin connector Common for data Wiring standard RJ-11 4 pin connector Telephone
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© ExplorNet’s Centers for Quality Teaching and Learning 8 Twisted Pair: Category The category system is a method of rating cable for its maximum data rate. All category cable is made of copper so the max length is ~100m due to attenuation. With any cabling, the higher the transfer frequencies the more likely the signal will attenuate sooner.
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© ExplorNet’s Centers for Quality Teaching and Learning 9 Coaxial: Interior and Exterior Coaxial cable technology dates back to the 1800’s. Durable Less susceptible to interference
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© ExplorNet’s Centers for Quality Teaching and Learning 10 Coaxial: Connecting In computer networks, coaxial is connected by: F-type connector Screw type Cable TV internet Bayonet Neill-Concelman (BNC) connector Rotate and click type Once used for LAN connectivity
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© ExplorNet’s Centers for Quality Teaching and Learning 11 Coaxial: Rating Coaxial cables come in a wide variety (~40 types). Common references use RG labelling. RG = Radio Guide Comes from World War II terminology. No longer officially recognized labelling.
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© ExplorNet’s Centers for Quality Teaching and Learning 12 Coaxial: Rating Most common RG types: RG-59 Single shielded Inexpensive RG-6 Double shielded Good for long distance Other associated terminology 10Base2 (thinnet) – 185m – 10Mbps 10Base5 (thicknet) – 500m – 10Mbps
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© ExplorNet’s Centers for Quality Teaching and Learning 13 Fiber Optic: Interior/Exterior Carries light instead of electricity. Glass core Light travels much faster than electricity.
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© ExplorNet’s Centers for Quality Teaching and Learning 14 Fiber Optic: Interior/Exterior Jacket is outermost protection (can contain reinforcing materials). Buffer keeps out moisture and other harmful substances. Core and Cladding made of super pure glass.
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© ExplorNet’s Centers for Quality Teaching and Learning 15 Fiber Optic: Connecting Common types include: ST Usually found in multimode application Circular, bayonet connector 2.5mm core
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© ExplorNet’s Centers for Quality Teaching and Learning 16 Fiber Optic: Connecting SC Multi or Single-mode Snap-in type Square shape 2.5mm core LC (most common) Multi or Single-mode Small Form Factor (SFF) Snap-in type Square shape 1.25mm core
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© ExplorNet’s Centers for Quality Teaching and Learning 17 Fiber Optic: Rating Single-mode Made for long distance More expensive Multi-mode Made for LAN application Multiple signals traveling through the same core Note the core/cladding ratio differences.
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© ExplorNet’s Centers for Quality Teaching and Learning 18 Fiber Optic: Rating *Research lab, South Hampton, UK, specialty fiber
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