MAC layer


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MAC layer

(Media Access Control layer) The part of the data link protocol that controls access to the physical transmission medium in IEEE 802 networks (LANs). The common MAC layer standards are CSMA/CD and CSMA/CA, which are used in Ethernet and Wi-Fi. Earlier MAC layers were the token passing methods in Token Ring, FDDI and MAP. MAC layer functionality is built into the network adapters, which includes a unique serial number that identifies the vendor and adapter (see OUI). See data link protocol, OSI model, CSMA/CD, CSMA/CA and Ethernet.


The Bottom Layers
In IEEE 802 networks, the data link layer is split into two sublayers. The Logical Link Control (LLC) is an interface to the Media Access Control (MAC) layer. The MAC is also physical hardware, because the processes have been embedded into the transceiver chips. See IEEE 802, SNA, OSI model and Token Ring.
References in periodicals archive ?
Wireless researchers can take advantage of the new multiuser MAC layer enhancements to the 802.
In MAC layer, two concepts included: Optimized Sleep Scheduling with minimum nodes active for data collection and Transmission Range/ Redundant data Control for forwarding data towards base station.
We use a "Route Failure Prediction Technique" based on the Newton interpolation (5) for estimating whether an active link is about to fail or will fail, and it can distinguish between both situations; link error at MAC layer was due to congestion and due to mobility of nodes to avoid the unnecessary route repair process.
Assume that the MAC layer of a given node can receive data from the upper layer at an arbitrary time.
Performance analysis of the MAC protocols used in PLC systems have been reported in [6] together with modeling methodology of the MAC layer protocols, later further refined and modified in the IEEE P1901 standard.
We use a "Route Failure Prediction Technique" based on the Lagrange interpolation (6) for estimating whether an active link is about to fail or will fail, and it can distinguish between both situations; link error at MAC layer was due to congestion and due to mobility of nodes to avoid the unnecessary route repair process.
We develop a two phase detection mechanism, where Phase I detection consists of tests executed at the monitor by observing the physical and MAC layer behavior of the nodes.
Using the MAC-PHY interface tap in conjunction with the over-the-air capture allows our R&D engineers to view a single, unified display showing WiMedia packets as they move from the RF domain to the WiMedia UWB MAC layer in our Device IP.
The software's intuitive graphical user interface grants engineers convenient access to the physical and basic MAC layer parameters, including bandwidth, cyclic prefix ratio (G), sampling factor (n), Fast Fourier Transform (FFT) size (512, 1024 or 2048) and frame length.
Redhawk is the first semiconductor device to incorporate multiple 10 Gbps SerDes and MAC layer logic into a single device for reduced footprint, cost and power.
Our WiMAX Mini-PCI Reference Design provides an optimal interface between Wavesat's PHY, Low-level Mac layer to most of the advanced RFICs available on the market today and relieves engineers from complex and time consuming design efforts.