Transcript of The Medium Access Control Sublayer طبقة ولوج الوسط الجزئية Chapter 4.
The Medium Access ControlSublayer
الجزئية الوسط ولوج طبقة
Chapter 4
The Channel Allocation Problemالقناة توضيع مشكلة
• Static Channel Allocation in LANs and MANs
شبكات في للقناة الستاتيكي MAN و LAN التوضيع• Dynamic Channel Allocation in LANs and MANs
شبكات في للقناة الديناميكي MAN و LAN التوضيع
Frequency Division Multiplexing (FDM)
Dynamic Channel Allocation in LANs and MANs
1. Station Model. المحطة نموذج
2. Single Channel Assumption. القناة فرضية المفردة
3. Collision Assumption. التصادم فرضية
4. (a) Continuous Time. المستمر الزمن(b) Slotted Time. المجزأ الوقت
5. (a) Carrier Sense. الحامل تحسس(b) No Carrier Sense. الحامل تحسس عدم
Multiple Access Protocols
• ALOHA• Carrier Sense Multiple Access Protocols• Collision-Free Protocols• Limited-Contention Protocols• Wavelength Division Multiple Access Protocols• Wireless LAN Protocols
Pure ALOHA
In pure ALOHA, frames are transmitted at completely arbitrary times.
Pure ALOHA (2)
Vulnerable period for the shaded frame.
Pure ALOHA (3)
Throughput versus offered traffic for ALOHA systems.
Wireless LAN Protocols
A wireless LAN. (a) A transmitting. (b) B transmitting.
Wireless LAN Protocols (2)
The MACA protocol. (a) A sending an RTS to B.
(b) B responding with a CTS to A.
Wireless LAN Protocols (3)
Wireless LAN Protocols (4)
Ethernet
• Ethernet Cabling• Manchester Encoding• The Ethernet MAC Sublayer Protocol• The Binary Exponential Backoff Algorithm• Ethernet Performance• Switched Ethernet• Fast Ethernet• Gigabit Ethernet• IEEE 802.2: Logical Link Control• Retrospective on Ethernet