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Leroy Jones, Jr. is the creator of Talking Technology with Leroy Jones, Jr.

SPACE CRASH

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PRESIDENTIAL SECURITY - CELL PHONE

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The issue of President Obama and his Blackberry continue . . .

Obama's BlackBerry brings personal safety risks



Don't forget:

POLITICAL TECHNOLOGY

THE NET & POLITICS




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TECHNOLOGY AND SENIOR HEALTH CARE

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Check out more on Technology and Senior Health Care:

In the U.S., sensors keep the elderly safe at home

 

Also don't forget:

 

Senior Sensors




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TECH STIMULUS

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Check out:

US Stimulus Package Includes Tech Provisions


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TECH TERMS - BANDWITH

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What is Bandwith?

DEFINITION:  In computer networks, bandwidth is often used as a synonym for data transfer rate - the amount of data that can be carried from one point to another in a given time period (usually a second).

This kind of bandwidth is usually expressed in bits (of data) per second (bps). Occasionally, it's expressed as bytes per second (Bps).

A modem that works at 57,600 bps has twice the bandwidth of a modem that works at 28,800 bps.

In general, a link with a high bandwidth is one that may be able to carry enough information to sustain the succession of images in a video presentation.

It should be remembered that a real communications path usually consists of a succession of links, each with its own bandwidth.

If one of these is much slower than the rest, it is said to be a bandwidth bottleneck.

In electronic communication, bandwidth is the width of the range (or band) of frequencies that an electronic signal uses on a given transmission medium.

In this usage, bandwidth is expressed in terms of the difference between the highest-frequency signal component and the lowest-frequency signal component.

Since the frequency of a signal is measured in hertz (the number of cycles of change per second), a given bandwidth is the difference in hertz between the highest frequency the signal uses and the lowest frequency it uses.

A typical voice signal has a bandwidth of approximately three kilohertz (3 kHz); an analog television (TV) broadcast video signal has a bandwidth of six megahertz (6 MHz) -- some 2,000 times as wide as the voice signal.



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