What is Medium access control?, Explain Medium access control, Define Medium access control
#Mediumaccesscontrol #audioversity
~~~ Medium access control ~~~
Title: What is Medium access control?, Explain Medium access control, Define Medium access control
Created on: 2019-01-15
Source Link: https://en.wikipedia.org/wiki/Medium_...
------
Description: In IEEE 802 LAN/MAN standards, the medium access control sublayer and the logical link control sublayer together make up the data link layer. Within that data link layer, the LLC provides flow control and multiplexing for the logical link , while the MAC provides flow control and multiplexing for the transmission medium. These two sublayers together correspond to layer 2 of the OSI model. For compatibility reasons, LLC is optional for implementations of IEEE 802.3 , but compulsory for implementations of all other IEEE 802 standards. Within the hierarchy of the OSI model and IEEE 802 standards, the MAC block provides a control abstraction of the physical layer such that the complexities of physical link control are invisible to the LLC and upper layers of the network stack. Thus any LLC block may be used with any MAC. In turn, the medium access control block is formally connected to the PHY via a media-independent interface. Although the MAC block is today typically integrated with the PHY within the same device package, historically any MAC could be used with any PHY, independent of the transmission medium. When sending data to another device on the network, the MAC block encapsulates higher-level frames into frames appropriate for the transmission medium , adds a frame check sequence to identify transmission errors, and then forwards the data to the physical layer as soon as the appropriate channel access method permits it. Controlling when data is sent and when to wait is necessary to avoid congestion and collisions, especially for topologies with a collision domain . Additionally, the MAC is also responsible for compensating for congestion and collisions by initiating retransmission if a jam signal is detected, and/or negotiating a slower transmission rate if necessary. When receiving data from the physical layer, the MAC block ensures data integrity by verifying the sender's frame check sequences, and strips off the sender's preamble and padding before passing the data up to the higher layers.
------
To see your favorite topic here, fill out this request form: https://docs.google.com/forms/d/e/1FA...
------
Source: Wikipedia.org articles, adapted under https://creativecommons.org/licenses/... license.
Support: Donations can be made from https://wikimediafoundation.org/wiki/... to support Wikimedia Foundation and knowledge sharing.
