Media Access Control


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Media Access Control

(networking)
(MAC) The lower sublayer of the OSI data link layer. The interface between a node's Logical Link Control and the network's physical layer. The MAC differs for various physical media.

See also MAC Address, Ethernet, IEEE 802.3, token ring.

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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.
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References in periodicals archive ?
Most of the previous work about IEEE 802.15.4e focused on the description of three media access control mechanisms, and did not have a comprehensive analysis and evaluation to the performance of IEEE 802.15.4e MAC.
The devices can also operate under the control of an external microcontroller or media access control (MAC) device, as well as operating without external control.
<p>The move is part of a shift by the Bluetooth Special Interest Group (SIG), to make use of alternative underlying physical and media access control layers to improve throughput.
This is achieved using several key technologies including Real- MIMO, advanced coding, channel bonding, a highly efficient media access control (MAC) packet-aggregation scheme, and Quality of Service (QoS) features.
The data is then transferred from the transmitting station (a PC or a server) to the destination as specified by the destination's Media Access Control (MAC) address, which is a unique number programmed in the adapter when it's built.
PMC-Sierra (Nasdaq:PMCS) has announced the PM3386 S/UNI-2xGE dual port Gigabit Ethernet transceiver, the industry's first integrated dual Serializer/Deserializer (SERDES) and Gigabit Media Access Control (MAC) controller with the industry standard POS-PHY Level 3 system interface.
Switching initially operated at Layer 2 of the OSI Model, which meant frames moved through the switch based on media access control (MAC)-layer address, similar to the way bridges functioned.
Software Support Firmware for media access control, evaluation and driver firmware for evaluation
The SCM120R modem uses Conexant's CN9414 single-chip cable modem, the only solution to include an embedded microprocessor-based media access control (MAC) with an Advanced RISC Machines (ARM) processor that can be software-upgraded to support new feature sets and industry standards via network downloads.
The CD server should have a unique MAC (Media Access Control) address that will be recognizable when using any of these three automatic configuration devices.