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Network+ Chapter 3
Chapter 3 - Transmission Basics and Neworking Media
12
Computer Networking
Not Applicable
02/13/2011

Additional Computer Networking Flashcards

 


 

Cards

Term

 

Transmit

Definition

 

to Issue signals along a network medium (cables)

Term
Analog Signals
Definition

 

Voltage varies; appears as a wavy line; conveys greater subtleties with less energy; varied and imprecise; susceptible to noise

Term
Analog Signal
Definition

 

4 properties:

Amplitude (measure of strength; height of wave)

frequency (# cycles from start to finish to start)

wavelengths (distance between points)

phase (wave progress over time)

 

Term
wdm (wavelength division multiplexing)
Definition
technology ised with fiber-optic cable; enables 1 cable to carry multi light signals simultaneously
Term
Digital signal
Definition

 

composed of precise positive pulses; 0's ands 1's that are called bits; more precise than analog

Term
byte
Definition
made of 8 bits; carries 1 piece of information
Term
Modem
Definition

 

modulates digital signals into analog at transmitting end , then demodulates analog signals into digital at the receiving end

Term
simplex
Definition
travels in one direction  (like a megaphone)
Term
half- duplex
Definition

 

travels in both directions (walkie talkie)

Term
full duplex
Definition
both directions over a medium simultaneously  (also called bidirectional)  (telephone)
Term
channel
Definition
distinct communication path between nodes
Term
multiplexing
Definition

 

allows muliple signals to travel simultaneously over one medium;

multiplexer at transmitting end and demultiplexer at receiving end

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