Tuesday, 3 April 2012

BIT RATE:  The bit rate is measured as number of bits transferred per second.
Unit symbol :
bit/s or bps

 BAUD RATE:  The bit rate is measured as number of symbols or  pulses transferred per second It is also called as symbol rate. 
Unit symbol : Bd/s

  1 kBd = 1,000 Bd

Example: 1000 Bd is equivalent to a symbol rate of 1,000 symbols per second.
For a modem, this corresponds to 1,000 tones per second, and
For a line code, this corresponds to 1,000 pulses per second.
Hence. the symbol duration time can be calculated as follows: 1/1,000 second = 1 millisecond.

GROSS BIT RATE: The gross bit rate is measured as the total number of physically transferred bits per second(bps) over a communication link, including useful data as well as protocol overhead.
Unit symbol : Rb or fb





KEY POINTS:

  1. In bit rate, 1000 bit/s or b/s should be represented as kbps and NOT Kbps
  2. The formal abbreviation for "bits per second" is bit/s and NOT bits/s.
  3. The symbol rate is related to but should not be confused with gross bit rate expressed in bit/s. Example: If N bits are conveyed per symbol, and the gross bit rate is R, inclusive of channel coding overhead, the baud rate (symbol rate) fs can be calculated as:


      f_s  =   {R \over N}.    

    BIT RATES
    Name
    Symbol
    Multiple

    Decimal prefixes

    kilobit per second
    kbit/s
    103

    megabit per second
    Mbit/s

    106
    gigabit per second

    Gbit/s
     109

    terabit per second

    Tbit/s
    1012
    Binary prefixes

    kibibit per second
    Kibit/s

    210
    mebibit per second

    Mibit/s
    220
    gibibit per second

    Gibit/s
    230
    tebibit per second

    Tibit/s
    240
     


    Reference: Internet and Wikipedia.



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