dhananjoy chowdhury Thu, 07/03/2008 - 02:51

Hi,

First of all the difference between MB/Mb and KB/Kb =

the Big "B" is Bytes

and the small "b" is bits

In our case, Networks its bits ( Mbps,Kbps etc.)

Hope this answers your query.

Joseph W. Doherty Thu, 07/03/2008 - 04:15

Bits are used in networks since we want to represent binary modulation rates and we're usually dealing with serial transmission. (There's also Baud, often used to be used with dial-up modems, which measures signal transition rates; often incorrectly used as being the same as bps.)

Bytes are usually significant to display characters (i.e. ASCII, EBCDIC) and often don't correspond to non-character data usage. For example, non-network people "knowing" that a byte is 8 bits usually don't understand why 10 Mbps Ethernet doesn't deliver 1.25 MBps. (For fun, explain how RS232's usage of 1, 1 and 1/2, or 2 stop bits impacts effective transmission rate, especially when using 1 and 1/2 stop bits.)

BTW: Bytes came from being part of a machine "word" which often stored a single display character and could also often be directly addressed.

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