If everyone speaks at the same time, it’s confusing and no-one can understand anything. a conversation with the family at the dinner table), is: only one person may send their information at once. The most important rule, which you’ll know from communication situations when there are several participants (e.g. So, there must also be a protocol for a wireless network that regulates the use of the medium. In this respect, WiFi (IEEE 802.11) is comparable to the early half-duplex Ethernet networks. Wireless networks naturally don’t use cables, but even with WLAN, all devices involved send and receive using only one transmission medium, namely a certain radio range.

In a local area network (LAN), all network participants share a transmission medium – a cable, the so-called bus. If overlapping does occur, this will be detected and the transmission will be tried again. Collision avoidance (CA): A complex schedule tries to ensure that two or more participants do not start a transmission at the same time to avoid collisions.It is crucial for functioning communication that all of them adhere to a binding protocol. Multiple access (MA): Several stations share a transmission medium.The carrier status detection checks the channel any time, and data is not sent until it’s available. Carrier sense (CA): The initial idea is that participants may only send data over the network if the transmission medium is free.To understand exactly what is behind Carrier Sense Multiple Access with Collision Avoidance, it makes sense to look at the components individually:

While CSMA/CA is mainly used in wireless networks, CSMA/CD was developed for Ethernet, and CSMA/CR is used in controller area networks (CAN), which are mainly used in cars and machines. However, this is now available in three different variants, which depend on the transmission medium. CSMA is a basic method that controls the communication of multiple participants on a shared and decentralized transmission medium.

Mac ethernet and wifi same time