Term
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Definition
Twisted pair
Coaxial cable
Optical fiber |
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Term
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Definition
Terrestrial Microwave
Satellite Microwave
Radio
IR |
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Term
| What measures are taken to reduce the noise impact on Twisted Pairs? |
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Definition
Shielding the wire
Twisting the wire
Use of different twist lengths
Use of balanced transmission line |
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Term
| What is special about Coaxial Cables and what are the 2 types |
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Definition
They have ummunity to electrical interferenece
baseband
broadband |
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Term
| What is a Baseband Coaxial-cable type's details? |
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Definition
Data rate is from 1 to 20mb/s
3/8 inche in diameter, 50 ohm
cable runs are 1 to 2km or less
SINGAL may be transimtted both dirctions at once
←Π→ |
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Term
| Coxial Cables info on broadband |
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Definition
0.5 inch, 75 ohm
bandwidth 300-400 MHz
One travel one direction
Two way exchange of info in a braodband Lan is accomplished either by single cable or dual cable schemes. |
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Term
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Definition
looks like a horse shoe
flow from left throught the U out the top
flow with comps = top down |
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Term
| Single-cable scheme with broadband |
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Definition
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Term
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Definition
Signals attenuate more at higher frequenceis than at lower frequencies.
The difference of attenuation of the high-frequency signal relative to that of low-frequency signals increase as the length of the cable system increases.
The cable title must be compensated for or equalized in order to maintain a flat amplitude response throughtout the cable system.
Amplifiers are used to equalize the signals by amplifiying the high-frequency signals and by adding attenuation to the lower frequencies. |
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Term
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Definition
| Loss(dB) = -10log(Pout/Pin) = -20 log(Vout/Vin) |
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Term
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Definition
| Power(dBm)=10log(P/0.001) |
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Term
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Definition
| Voltage(dBmV) = 20log(V/0.001) |
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Term
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Definition
| The different angles of propagating rays. An analysis of Maxwell's equations shows that htere is only a finite set of angle values for the rays that can propageta along the fiber. |
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Term
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Definition
to impose a minimum value of T, the time taken for transmitting each bit.
Limits the maximum bit-transmission rate
Transmission rate cannot be as large for long fiber as for short ones. |
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Term
| Monomode step-index fiber |
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Definition
Free of modal dispersion bc only a single angle or mode can propagate in the fiber
however it still has meterial dispersion. |
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