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1 Chapter 5 The Medium Access  Sublayer 1 Chapter 5 The Medium Access  Sublayer

1 Chapter 5 The Medium Access Sublayer - PowerPoint Presentation

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1 Chapter 5 The Medium Access Sublayer - PPT Presentation

2 Chapter 5 The Medium Access Layer 51 The Channel Allocation problem Static and dynamic channel allocation in LANs amp MANs 52 Multiple Access Protocols ALOHA CSMA CSMACD Collisionfree protocols Limitedcontention protocols Wireless LAN protocols ID: 655109

frame channel protocols 802 channel frame 802 protocols access allocation protocol sense lans multiple wireless structure bridges carrier stack time layer sublayer

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Presentation Transcript

Slide1

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Chapter 5

The Medium Access SublayerSlide2

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Chapter 5 The Medium Access Layer

5.1 The Channel Allocation problem

- Static and dynamic channel allocation in LANs & MANs

5.2 Multiple Access Protocols

- ALOHA, CSMA, CSMA/CD, Collision-free protocols, Limited-contention protocols, Wireless LAN protocols

5.3 Ethernet

- Cabling, MAC sublayer protocol, Backoff algorithm, Performance, Gigabit Ethernet, 802.2 Logical Link Control

5.4

Wireless LANs

- 802.11 protocol stack, physical layer, MAC sublayer protocol, frame structureSlide3

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5.5 Broadband Wireless

- Comparison of 802.11 with 802.16, protocol stack, frame structure

5.6 Bluetooth

- Bluetooth architecture, Application, Protocol stack, Frame structure

5.7 Data Link Layer Switching

- Bridges from 802.x to 802.y, Local internetworking, Spanning tree bridges, Remote bridgesSlide4

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5.1 The

Channel

Allocation problem

5.1.1 Static channel Allocation in LANs and WANs

Frequency Division Multiplexing (FDM)Slide5

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5.1.2 Dynamic Channel Allocation in LANs and WANs

Assumptions

Station Model. The model consists of N independent stations, each generates the frame with probability

in an interval

.

Once a frame is generated, the station is blocked.

Single Channel Assumption. A single channel is available for all communication.

Collision Assumption. If two frames are transmitted simultaneously, they are destroyed and must be retransmitted again later. There are no other errors.Slide8

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4a. Continuous Time. Frame transmission can begin at any instant

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4b. Slotted Time. Time is divided into slots. Frame transmission always begin at the start of a slot.

5a. Carrier Sense. Stations can tell if the channel is in use before trying to use it.

5b. No Carrier Sense. Stations cannot sense the channel before trying to use it.Slide9

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5.2 Multiple Access Protocols

5.2.1 ALOHA

5-1.Slide10

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5-2.Slide11

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5-3.Slide13

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5.2.2 Carrier Sense Multiple Access ProtocolsSlide26

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5-4.Slide30

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5-5.