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Chapter 3
N/A
34
Computer Networking
Undergraduate 4
12/08/2011

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