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Madge Networks 802.11b Manuale Utente Pagina 12
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12
Throughput
Token ring
Token bus
CSMA/CD bus
24.0
20.0
4.0
Non-contention based, deterministic
access gives token ring/bus technologies
better throughput
1
2
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Link Layer Standards and
1
Protocols
1
Link Layer Standards
2
Medium Access Control Layer
3
Services
3
Logical Link Control Services
4
Standard Link Layer Protocols
5
IEEE 802.5/IBM Token Ring
6
Token Ring Operation
8
Token Ring MAC Frame
9
Other Features of Token Ring
10
(ANSI X3T12)
11
Wireless hosts
13
• Laptop, PDA, IP phone
13
• Run applications
13
• May be stationary (non
13
– e.g., Cell towers
14
802.11 access points
14
Network
14
Infrastructure
15
Wireless Link Characteristics
18
Wireless LANs and CSMA
19
Hidden Terminal Problem
20
Exposed Station Problem
21
Access in Wireless
22
IEEE 802.11 Wireless LAN
23
802.11 LAN architecture
24
802.11: Channels, association
25
802.11 Modes of Operation
26
– Protocols used are:
27
IEEE 802.11: Medium Access
28
802.11 sender
29
802.11 receiver
29
- if frame received OK
29
Avoiding Collisions (more)
30
Collision Avoidance: RTS-CTS
31
The 802.11 MAC Protocol…
32
Extending Wireless Network
35
Extending Wireless Network…
36
802.11 Frame: Addressing
37
802.11 frame: addressing
38
802.11 frame: more
39
802.11 Services
40
802.11 Services…
41
Wi-MAX (802.16)
42
The 802.16 Physical Layer
43
802.16 Physical Layer
44
Other Popular Wireless
45
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Networking Madge Networks 802.11b Guida Utente
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