24/11/2008, 09:14 PM
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| زعيــم متواصــل | | تاريخ التسجيل: 18/04/2008
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* Bits per second: How communication devices are rated. Kilo means 1,000 and mega means 1,000,000.
Examples include 56k modem and 10Mbit Ethernet.
* Bytes per second: The way data is measured on your hard drive and how file sharing and FTP programs
measure transfer speeds. Kilo is 1,024 and mega is 1,048,576.
Bits(b), Bytes(B), and Baud
Bits and bytes are a measurement of electronic information.
A byte is always 8 bits. Communications speeds are usually measured in bits per second while many computer
operations are measured in bytes per second. A "56k" modem is 56 kilobits and a "2m" DSL connection
is 2 megabits per second. "128MB" of RAM is 128 megabytes. Ideally when abbreviations are used, b means bits
and B means bytes. Baud rate is another measure of transmission speed and is the number of actual signals sent
per second. At one time it was equal to the bits per second, but modern technology allows us to send more
than one bit per electric signal.
Mega(M) and kilo(k)
Traditionally kilo means one thousand exactly. In the communications world engineers call a thousand bits
transmitted in a second 1 kilobit per second. Makes sense. Now while 1000 is a nice round number for
humans to work with, it isn't for computers. Mathematically speaking humans use decimal or base 10 numbers
and computers use binary or base 2. 1024 is 2 to the power of 10 which is a significant binary value and so
is represented by kilo in the computer world. Mega is similar except it means one million and in the computer
world is 1024 kilo or 1,048,576. Ideally when abbreviations are used, k means 1000 and K means 1024. |
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