Term
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Definition
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Term
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Definition
physical media (cables)
special purposes devices (routers/hubs) |
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Term
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Definition
phyical - connect devices
logical - transmission characteristics
may be the same or different |
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Term
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Definition
analog - produced by telephones
digital - produced by computers in binary form |
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Term
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Definition
modular/demodular
-used when digital data is sent as an analog transmission |
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Term
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Definition
coder/decoder
-used when analog data is sent via digital transmission |
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Term
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Definition
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Term
| digital transmission advantages |
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Definition
produces fewer errors
allows higher maximum transmission rates
more efficient
more secure
simpler to integrate voice, video, and data |
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Term
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Definition
| basic physical layout of the circuit |
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Term
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Definition
-point to point (dedicated)
-multipoint (shared) |
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Term
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Definition
simplex (one direction)
half-duplex (both ways, but one direction at a time)
full-duplex (both directions at the same time) |
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Term
| how is a data flow method selected? |
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Definition
| depends on application and possibly capacity |
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Term
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Definition
-breaking up higher speed circuits into several slower circuits
-advantage: cost |
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Term
| categories of multiplexing |
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Definition
FDM - frequency division multiplexing
TDM - time division multiplexing
STDM - statistical time division multiplexing
WDM - wavelength division multiplexing
DWDM - dense wavelength division multiplexing |
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Term
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Definition
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Term
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Definition
| Bandwidth ON demand Network Interoperability Group |
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Term
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Definition
digital subscriber line
-increase data rates in the local loop |
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Term
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Definition
asynchronous DSL
types: G.Lite |
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Term
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Definition
twisted pair wires
used to telephone and LANs |
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Term
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Definition
has a shield
more expensive that TP
used for cable TV |
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Term
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Definition
| light created by LED or laser that is sent down a thin glass or plastic fiber |
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Term
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Definition
TP wiring
coaxial cable
fiber optic cable |
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Term
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Definition
radio
satellite
microwave
infared |
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Term
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Definition
multimode
graded index multimode
single mode |
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Term
| factors used in media selection |
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Definition
type of network
cost
transmission distance
security
error rates
transmission speeds |
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Term
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Definition
| american standard code for information interchange |
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Term
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Definition
| extended binary coded decimal interchange code |
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Term
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Definition
| on a single wire (serial) or multiple wires (parallel) |
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Term
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Definition
unipolar (0 and + OR 0 and -)
bipolar (+ and -) |
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Term
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Definition
| plain old telephone service |
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Term
| soundwave characteristics |
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Definition
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Term
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Definition
| speed = frequency * wavelength |
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Term
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Definition
modification of a carrier wave
AM - amplitude shift keying (ASK)
FM - frequency shift keying (FSK)
PM - phase shift keying (PSK) |
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Term
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Definition
PAM - pulse amplitude modulation
QAM - quadrature amplitude modulation
TCM - trellis-coded modulation
ADOCM - adaptive differential pulse code modulation |
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