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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11A media access method is the rule that decides which device may transmit on a shared communication channel, and when. IBM’s glossary defines it as “the method for determining which device has access to the transmission medium at any time.” In networking, this job is handled by media access control (MAC), a function of the data link layer.
Why shared media need an access method
When several devices share one medium, such as a cable segment, a radio channel or a cellular band, their transmissions can overlap and interfere with each other. A media access method sets the rules that keep this under control. Without such rules, devices would transmit at will and many frames would be damaged or lost.
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The IEEE describes media access control (also written “medium access control”) as the set of rules that decides which station may transmit on a shared channel and when. In the IEEE 802 reference architecture, it sits in the lower sublayer of the data link layer.
Two broad families of methods
Contention-based access
Stations compete for the channel. A device may listen first (carrier sensing), transmit when the medium looks free, and retry if its frame collides with another. No central scheduler is needed. The cost is that collisions can occur and delay becomes variable as traffic grows.
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Scheduled or assigned access
Transmission opportunities are allocated in advance. Examples the IEEE describes include time-division slots, frequency or code division, token passing and cellular scheduling. Schedules can limit collisions and bound how long a device waits. The costs are coordination overhead, and slots that sit idle when traffic is light.
| Aspect | Contention-based | Scheduled / assigned |
|---|---|---|
| Who decides | Each station, using shared rules | A schedule, token or controller |
| Collisions | Possible; stations retry | Reduced or avoided by design |
| Access delay | Variable, especially under load | Can be bounded |
| Overhead | Little central coordination | Needs scheduling or token management |
| Light-load behavior | Channel is available immediately | Assigned slots may go unused |
How to compare methods
No family is best everywhere. The IEEE’s overview points to these criteria, and the right balance depends on the traffic and the medium:
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- Throughput
- Delay
- Fairness between stations
- Energy use
- Collision behavior
- Coordination overhead
A standards example: FDDI
ISO/IEC 9314-8:1998 is a concrete case, not the general definition. It specifies the media access control of FDDI (Fiber Distributed Data Interface). ISO says it covers fair and deterministic access, address recognition, frame-check-sequence generation and verification, and packet delivery. The catalogue lists edition 1, published in October 1998, with a lifecycle stage of “confirmed”.
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Terms that are easy to confuse
- MAC address: a device identifier used in frame exchanges on a network. It names a device. It does not decide who may transmit. The IETF’s RFC 9797 discusses IEEE 802 MAC rules and addresses in more operational detail.
- Mandatory access control: an unrelated information-security model that is also abbreviated MAC. NIST’s glossary documents it separately.
- Media access control vs. media access method: the first is the sublayer and its function in IEEE 802. The second is the general term for the access rule itself. In practice the two are often used interchangeably.
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