In data communication, the transmission medium is also known as channel . The capacity of a channel is the maximum amount of signals or traffic that a channel can carry . It is measured in terms of bandwidth and data transfer rate.


  • Bandwidth of a channel is the range of frequencies available for transmission of data through that channel. 
  • Higher the bandwidth, higher the data transfer rate. 
  • Normally, bandwidth is the difference of maximum and minimum frequency contained in the composite signals. 
  • Bandwidth is measured in Hertz (Hz). 

1 KHz =1000 Hz 

1 MHz =1000 KHz = 1000000 Hz

Data transfer rate

  • Data transfer rate is the number of bits transmitted between source and destination in one second. 
  • It is also known as bit rate. 
  • It is measured in terms of bits per second (bps). 
  • The higher units for data transfer rates are: 
    • 1 Kbps=210 bps=1024 bps 
    • 1 Mbps=220 bps=1024 Kbps 
    • 1 Gbps=230 bps=1024 Mbps 
    • 1 Tbps=240 bps=1024 Gbps
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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.