Table of Contents
4.2 Collision-Free Protocols
Performance of Basic Bit-Mapped Method
Limited Contention Protocols
Token Rings
Token Ring - General Method
Token Bus (IEEE 802.4)
Why Token Ring Protocol is Complex
Token Ring Standard (IEEE 802.5)
Modes and Protocols
Token Length vs Ring Length
Ring Maintenance
Fiber Distributed Data Interface (FDDI, ~802.5)
FDDI - Two Counter Rotating Rings
FDDI Frame Structure ( ~ IEEE 802.5)
FDDI Protocol
Multiple Tokens Possible
Two Frames on Ring
Capacity Allocation in FDDI
FDDI Capacity Allocation Algorithm
FDDI Capacity Allocation - Example
Distributed Queue Dual Bus (DQDB, 802.6)
DQDB - Distributed Reservation Protocol
DQDB Example - X sends f1 to Y
Synchronous Digital Heirarchy (SDH/SONET)
OC-1 SONET Frames = 810 bytes at 51.84 Mb/ s
OC-N SONET Frames = N * 51.84 Mb/ s
IEEE 802 - Physical & Network Layers
MAC Performance Analysis
Channel Utilization for a Perfect MAC Protocol
Utilization vs a
Token Passing Utilization - Best Case
Token Passing Utilization - Best Case
Utilization for CSMA/ CD
Normalized Throughput vs a for N = 10 Stations
Normalized Delay vs Throughput
M/ M/ 1 - Poisson Process - Exponential Distribution
M/ M/ 1 - Poisson Process
Steady state M/ M/ 1 Queue
M/ M/ 1 Channel
Static versus Dynamic Channel Allocation
Wireless LAN Protocols - MACAW
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