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Which system allows the entire bandwidth to be available to each user at the same time?

Which system allows the entire bandwidth to be available to each user at the same time? Correct Answer CDMA

CSMA stands for Carrier Sense Multiple Access. 

  • It is a Media Access Control (MAC) protocol that is used to control the flow of data in a transmission media so that packets do not get lost and data integrity is maintained.
  • There are two modifications to CSMA: 1) CSMA CD (Collision Detection) and 2) CSMA CA (Collision Avoidance)


CDMA stands for Code Division Multiple Access.

  • It is a channel access method used by various radio communication technologies.
  • The principle of the spread spectrum is used to work with CDMA.
  • CDMA is not frequency specific to each user, instead, every channel uses the full available spectrum.
  • Each user in a CDMA system uses a different code to modulate their signal.


FDMA stands for Frequency Division Multiple Access.

  • >FDMA is a channel access method used in some multiple-access protocols.
  • >FDMA allows multiple users to send data through a single communication channel, such as a coaxial cable or microwave beam, by dividing the bandwidth of the channel into separate non-overlapping frequency sub-channels and allocating each sub-channel to a separate user.
  • Users can send data through a sub-channel by modulating it on a carrier wave at the sub-channels frequency.
  • >FDMA is not vulnerable to timing errors.

Important Points

Time-division multiple access (TDMA)

  • This is a channel access method for shared-medium networks.
  • It allows several users to share the same frequency channel by dividing the signal into different time slots.
  • The users transmit in rapid succession, one after the other, each using its own time slot. This allows multiple stations to share the same transmission medium (e.g. radio frequency channel) while using only a part of its channel capacity.
  • TDMA is vulnerable to timing errors.

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