Network+ 2007 5-16: Coaxial and Fiber Optic Cables
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| Fiber Optic Cable | A cable comprised of light-conducting glass encased in plastic fibers and surrounded by protective cladding and a durable outer sheath
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| Coaxial Cable | A cable comprised of two conductors that share the same axis. There is a center cable, then plastic foam, then a second cable, then foil wrap, then a plastic sheath
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| Coax Cable Termination | Coax cable must be terminated at both ends. Terminate by connecting inner wire to outer wire via a resistor of a specific size. No data transmission possible without termination.
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| 10Base5 (Ethernet) Cable Type Termination (ohms) | RG8 and RG11
50
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| 10Base2 (Ethernet) Cable Type Termination (ohms) | RG58
50
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| Cable TV Cable Type Termination (ohms) | RG59
75
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| ARCnet Cable Type Termination (ohms) | RG62
93
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| Facts about Coax Cabling Cost Ease of Installation Capacity Attenuation EMI | Moderate (30-40 cents/ft)
Clumsy for workstations, good for connecting buildings or hubs
1-100 Mbps, 10 most common
Moderate to low. Max 1000s of meters w/ repeaters
Some EMI sensitivity
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| Coax Cable grounding | The outer conductor grounded at one end. Most terminators have a grounding wire that can be attached to an Earth ground (eg. a water pipe).
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| BNC | Bayonet Nut Connector
A 2-pin coax cable connector that uses a slide lock to hold a connection together
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| F-Type Connector | A coax cable connector used for Cable TV
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| Fiber Optic Cable -Cost -Ease of Installation -Attenuation -EMI Immunity -Max Speed | Moderate to Expensive
Tedious and expensive
Extremely low, max distance <=2 km
EMI Immune, highly secure
4 Gb/Sec
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| Fiber Optic Cable Classification | Common cables are classified by core diameter in microns
-Almost all LAN fiber cable has a 63.5 micron core, and the outer diameter is 125 microns, so it is classified as 62.5/125 cable
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| MMF -Core diameter -Transmission method | Multi-mode Fiber (Cable)
-Usually 62.5 microns (50 microns also avail.)
-Light travels down the cable in many rays (modes)
-works with LED light sources of different wavelengths, depending on desired speed
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| SMF -Core diameter -Transmission method | Single-mode Fiber (Cable)
-9 microns
-Light travels down the cable in one ray (mode)
-Optimal for very fast transmissions
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| FSD | Fixed Shroud Device
-A common Fiber Optic Cable connector
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| ST | -A common Fiber Optic Cable connector
-A keyed BNC-style connector
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| SC | -A common Fiber Optic cable connector
-Is an Int'l std. push/pull connector
-Has a single duplexed chip for send and receive fibers
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| LC | -A common Fiber Optic cable connector
-Developed by Lucent Corp.
-A smaller connector for saving space on patch panels
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| MTRJ | -A common Fiber Optic cable connector
-Has a small form factor
-Can be used with MMF and SMF fiber
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| SMA | -A common Fiber Optic cable connector
-A threaded connector that is no longer used because twisting the fiber to connect/disconnect the cable scratched the core
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| Fiber Optic Cable Connector Mounting | Used to be a tedious process of cutting and polishing the fiber before mounting the connector
-Now cutters polish at the same time, which makes it much easier
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