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AM
(Amplitude Modulation) A modulation technique in wich the amplitude of signal is modifide
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Attenuation
Extent to wich a signal has weakened after travaling a given distance
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Bandwidth
A measure of the difference between the highest and lowest frequencies that a medium can transmit
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Baseband
digital sigleals sent, baseband systems can only transmit one signal at a time
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BNC
(Bayonet Neill-concelman) Standered for coaxial connectors
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Broadband
signals modulated as radiofrequency, analog pulses, multichannel (unlike Baseband)
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Cat 4
UTP, 16-Mbps Throughput, Used in 16-Mbp tokenring, or 10-Mbps ethernet
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Cat 5
UTP, 100-Mbps throughput, 100-MHz signal
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Cat 5e
reduced crosstalk, 350 Mhz
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Cat 6
6 times throuput of cat 5, 250 MHz
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Cat 6e
550 MHz, multi-gigabit per second
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DB-9 Connector
9 pin, serial comunication
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DB-25 Connector
25 pin, serial
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DCE
(Data circuit-terminating equipment)
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DTE
Any end-user device, Pc, terminal
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DWDM
- (dense wavelength division multiplexing)
- multiplexing technique used over single mode or multi mode fiber, each signal differnt wavelangth
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F-type connector
used to terminate coaxial
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FDM
- (frequency division multiplexing)
- multiplexing, assighns unique frequency band to each comm. subchannel, modulated carrier frequencies, multiplexed to travel over a single channel
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Ferrule
encircles fiber strand in connector, keeps fiber alighned
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Full-duplex
transmission were signals can travel both ways on medium at the same time
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Latency
Delay between transmission of signal and its receipt
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MMF
- (multimode fiber)
- Fiber core 50-100 microns, LED
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Modem
analog into digital, and digital to analog
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MT-RJ
- (mech. trans.-registered Jack)
- Connector used with Multi and single fiber
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Overhead
nondata info that accompanys data
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Regeneration
regens. digital signal without noise
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RG-6
coax, 75 ohms, 18 awg
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RG-8
coax, 50 ohms, 10 awg
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RG-59
75 ohm, 20 or 22 awg
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RJ-11
stand. connector for UTP (Cat 3) analog phones
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Serial
trans. pulses rep. bits of data follow one another sequentially
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SMF
- (Single Mode Fiber)
- single path, faster for longer distance, explensive
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ST
- (Straight tip)
- conn. used with single-mode or miltimode fiber
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Statistical multiplexer
Each node assinghned a time for transmitting
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Thicknet
IEEE P. layer standered for achieving maximum of 10-Mdps thro. over coax, max length 500 meters, bus topology
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Thinnet
IEEE 10-Mbps thro. over coax, 185 meter max, bus topology
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