chapter 7 transmission media - bca notes
TRANSCRIPT
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Transmission Media
Guided Media
Unguided Media
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Electromagnetic Spectrum
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Twisted-Pair Cable
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Effect of Noise on Parallel Lines
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Noise on Twisted-Pair Lines
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Unshielded Twisted-Pair Cable
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UTP Connectors
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Shielded Twisted-Pair Cable
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Coaxial Cable
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CATEGORIES OF COAXIAL CABLES
CATEGORY IMPEDENCE USE
RG-59 75 Ohm Cable TV
RG-58 50 Ohm Thin Ethernet
RG-11 50 Ohm Thick Ethernet
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BNC(Bayone-Neill-Concelman) Connector
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Fiber Construction
Fiber Optic is made of glass or plastic and transmit signals in the form of light.
Bandwidth capacity is certainly in excess of 50,000Gbps(50 Tbps).
Similar to coax, except without outer braid.
Core is typically 8-10 microns in diameter, about the thickness of a human hair. Fiber can connect in three ways:
They can terminate in connectors and be plugged into fiber socket.
Spliced manually with special sleeve and clamp them in place.(10% light loss).
Two pieces of fiber can be fused to form solid connector
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Item LED Semiconductor Laser
Data Rate Low High
Fiber Type Multi cost Multimode or single mode
Distance Short Long
Lifetime Long Life Short Life
Temperature Sensitivity Minor Substantial
Cost Low Cost Expensive
Light Sources in Fiber Optic Cable
Two Kinds of light sources are typically used to do the signaling:
LED
Semiconductor Laser
The receiving end of an optical fiber consists of photodiode, which gives off an electrical pulse when
struck by light.
Response time of a photodiode is 1 nsec, which limits data rate refers to about 1Gbps
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