CASE STUDY OF IEEE 802.2

CASE STUDY OF IEEE 802.2

No higher-level layers and interoperability sublayers are defined in the standard. Besides the data service, it offers a management interface and itself manages access to the physical channel and network beaconing. The first part of the superframe must be sufficient to give service to the network structure and its devices. The emphasis is on very low cost communication of nearby devices with little to no underlying infrastructure, intending to exploit this to lower power consumption even more. This article relies too much on references to primary sources. First standard amendments by these groups were released in April

These are meant to be extremely simple devices with very modest resource and communication requirements; due to this, they can only communicate with FFDs and can never act as coordinators. Finally, it offers hook points for secure services. Superframes are typically utilized within the context of low-latency devices, whose associations must be kept even if inactive for long periods of time. The same is done when superframes are not in use, only in this case there are no beacons to keep track of pending messages. A superframe consists of sixteen equal-length slots, which can be further divided into an active part and an inactive part, during which the coordinator may enter power saving mode, not needing to control its network. The first part of the superframe must be sufficient to give service to the network structure and its devices. On the other hand, there are reduced-function devices RFD.

case study of ieee 802.2

Frames are the basic unit of data transport, of which there are four fundamental types data, acknowledgment, beacon and MAC command frameswhich provide a reasonable tradeoff between simplicity and robustness. As mentioned before, applications with well-defined bandwidth needs can use up to seven domains of one or more contentionless guaranteed time slots, trailing at the end of the superframe.

It can serve as the coordinator of a personal area network just as it may function as a common node. The physical frame-format is specified in IEEE This article relies too much on references to primary sources.

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They are meant to serve as the basis for ad hoc networks capable of performing self-management and organization. Type 1 Logical Link Control simply provides the differentiation function, with no sequence and acknowledgement process.

case study of ieee 802.2

Networks are thus formed by groups of devices separated by suitable distances. No higher-level layers and interoperability sublayers are defined in the standard. In addition to this secure mode, there is another, insecure MAC mode, which allows access ieee lists [2] merely as a means to decide on the acceptance of frames according to their presumed source. Besides the data service, it offers a management interface and itself manages access to the physical channel and network beaconing.

Tradeoffs are possible to favor more radically embedded devices with even lower power requirements, through the definition of not one, but several physical layers.

case study of ieee 802.2

Networks which are not using beaconing mechanisms utilize an unslotted variation which is based on the listening of the medium, leveraged by a random exponential backoff algorithm; acknowledgments do not adhere to this discipline. A programmer can select Type 2 Logical Link Control in which case the frames are given sequence numbers as they pass through the SAP and the The emphasis is on very low cost communication of nearby devices with little to no underlying infrastructure, intending to exploit this to lower power consumption even more.

It operates on one of three possible unlicensed frequency bands:.

After that, other devices can join the network, which is fully independent from all other star networks. Data transfers leee the coordinator usually follow device requests: Because the predicted environment of these devices demands maximization of battery life, the protocols tend to favor the methods which lead to it, implementing periodic checks for pending messages, the frequency of which depends on application needs.

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LLC – IEEE 802.2 Logical Link Control

It is tailored to the fact that most IEEE It implements a general model of communication which allows it to talk to any other device: The first part of the superframe must be sufficient to give 802.2 to the network structure and its devices. The physical layer is the initial layer in the OSI reference model used worldwide. Finally, it offers hook points for secure services.

This creates a reliable data transfer mechanism at the Data Link Layer. Devices are conceived to interact with each other over a conceptually acse wireless network.

Every transmission must end before the arrival of the second beacon. Thus, the PHY manages the physical RF transceiver and performs channel selection and energy and signal management functions.

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Furthermore, MAC computes freshness checks between successive receptions to ensure that presumably old frames, or data which is no longer considered valid, does not transcend to higher layers. Networks can be built as either peer-to-peer or star networks.

Whatever the case, if a device is unable to studg a frame at a given time, it simply does not confirm its reception: Three of them preserve the DSSS approach: A superframe consists of sixteen equal-length slots, which can be further divided into an active part and an inactive part, during which the coordinator may enter power saving mode, not needing to control its network.

Beyond these three bands, the IEEE Retrieved 20 July The same is done when superframes are not in use, only in this case there are no beacons to keep track of pending messages.