Essay on Data Communications

Submitted By Elizabeth-Asl

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DATA COMMUNICATIONS
By Liz McCullar

4/3/2015

1

BANDWIDTH

 Bandwidth is the rate of data transfers.
 Measured in bits per second (bps)
 Typical speeds in megabits per second
(Mbps)
 Can be gigabits per second (Gbps) http://searchenterprisewan.techtarget.com/definition/bandwidth 4/3/2015

2

FREQUENCY
 Frequency is the number of cycles per second for an oscillating current.
 Measured in hertz (Hz), Megahertz (MHz), or Gigahertz
(GHz)
 “Frequency is important in wireless communications, where the frequency of a signal is mathematically related to the wavelength. If f is the frequency of an electromagnetic field in free space as measured in megahertz, and w is the wavelength as measured in meters, then w = 300/f” http://whatis.techtarget.com/definition/frequency 4/3/2015

3

DATA RATE
 Data Rate is speed!
 The speed that data is transferred
 The speed of a network
 The speed of audio and video files compressed Http://www.pcmag.com/encyclopedia/term/40833/data-rate

4/3/2015

4

DECIBELS
1
 “A unit for expressing the ratio of two amounts of electric or acoustic signal power equal to 10 times the common logarithm of this ratio”
 “A unit for expressing the ratio of the magnitudes of two electric voltages or currents or analogous acoustic quantities equal to 20 times the common logarithm of the voltage or current ratio”

http://www.merriam-webster.com/dictionary/decibel

4/3/2015

5

HIGH SPEED DATA
TRANSFER

 Data Transfer Rate is the speed at which data moves.
 The higher the bandwidth, the faster the data transfers.
 Data transfer is measured in bits per second (bps).
 Ethernet cables can transmit as fast as 10 Mbps.
 Network switches

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