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Fiber Optic Cable
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Coaxial Cable
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Net+ Coax & Fiber

Network+ 2007 5-16: Coaxial and Fiber Optic Cables

QuestionAnswer
Fiber Optic Cable A cable comprised of light-conducting glass encased in plastic fibers and surrounded by protective cladding and a durable outer sheath
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
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.
10Base5 (Ethernet) Cable Type Termination (ohms) RG8 and RG11 50
10Base2 (Ethernet) Cable Type Termination (ohms) RG58 50
Cable TV Cable Type Termination (ohms) RG59 75
ARCnet Cable Type Termination (ohms) RG62 93
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
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).
BNC Bayonet Nut Connector A 2-pin coax cable connector that uses a slide lock to hold a connection together
F-Type Connector A coax cable connector used for Cable TV
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
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
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
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
FSD Fixed Shroud Device -A common Fiber Optic Cable connector
ST -A common Fiber Optic Cable connector -A keyed BNC-style connector
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
LC -A common Fiber Optic cable connector -Developed by Lucent Corp. -A smaller connector for saving space on patch panels
MTRJ -A common Fiber Optic cable connector -Has a small form factor -Can be used with MMF and SMF fiber
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
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
Created by: ibnpaul
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