Concepts

Computer Science - Class 12
Chapter 11 - Data Communication

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

• 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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