Multiple access protocols in Computer Network
Multiple access layers are needed to decrease collisions and prevent crosstalk. The protocols can be divided in the following way:
- Random Access Protocol
In the random access protocol, there is no fixed time or sequence for sending data.
It can be further divided as:
- ALOHA
- CSMA
- CSMA/CD
- CSMA/CA
- Controlled Access
In controlled access, the data is sent only when it is approved by other stations.
- Channelization
The available bandwidth of the link is shared to multiple stations for access at the same time.
There is:
- Frequency Division Multiple Access (FDMA)
In FDMA, the available bandwidth is divided equally so each station can have its own band.
- Time Division Multiple Access (TDMA)
In TDMA, the bandwidth is shared among multiple stations.
- Code Division Multiple Access (CDMA)
In CDMA, a single channel carries out all the transmissions simultaneously.