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Chapter 7 Ethernet LANs 1
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Rivier CollegeCS575: Advanced LANs
Chapter 7: Ethernet LANs
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Carrier Sense Multiple Access with Collision Detection(CSMA/CD) as the Ethernet Medium Access Control
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CSMA/CD Operations
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Operation of a Two-Level Star-TopologyCSMA/CD Configuration
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IEEE 802.3 Frame Format
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IEEE 802.3 Parameterized Values
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10-Mbps Ethernet
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Simple 10BASE-T Configuration
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Mixed 10BASE-T and 10BASE5 Configuration
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10BASE-F Medium Specification
0 Added to IEEE 802.3 in 19930 Advantages of the distance and transmission on optical fiber0 10BASE-FP (passive): passive-star topology for stations/repeaters
with up to 1 km per segment; makes synchronous retransmission0 10BASE-FL (link): a point-to-point link for connecting
stations/repeaters at up to 2 km; asynchronous signaling; any timing distortions are propagated through a series of repeaters
0 10BASE-FB (link): a point-to-point link for connecting repeaters at up to 2 km; a cascade up to 15 repeaters in sequence to activate greater length.
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IEEE 802.3 100BASE-T Options
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IEEE 802.3 100BASE-T Physical Layer Medium Alternatives
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Collision Domains
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100BASE-T Repeater Types
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Maximum Collision Domain (meters)
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100BASE-T Capacity Information Exchange:Autonegotiation
0 Performed by passing information encapsulated within a burst of closely separated pulses (link integrity pulses)
0 The pulse burst consists of 33 pulse positions
- 17 odd-numbered pulse positions contain a link pulse
- Each of the 16 even-numbered pulse positions contains “1” or “0”
0 This 16-bit word is embedded in the pulse burst and consists of the fields:
- Selector field (5 bits): to identify the type of message being sent
- Technology ability field (8 bits): supporting medium technology (100BASE-TX full duplex, 100BASE-T4, 100BASE-TX, 10BASE-T full duplex, and 10BASE-T)
- Remote fault bit: a fault condition identifier for the link partner
- Acknowledge bit: confirms a receiving of link partner’s code work
- Next page bit: indicates that another code work will follow this one.
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Example: 100-Mbps Ethernet Backbone Strategy
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Digital Signal Encoding for 100BASE-T: 4B/5B-NRZI
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Digital Signal Encoding for 100BASE-T: 4B/5B-NRZI
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Example: Gigabit Ethernet Configuration
* Error-detection technique requires an Error-Detecting Code (e.g., CRC)
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Gigabit Ethernet Layers
* Error-detection technique requires an Error-Detecting Code (e.g., CRC)
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Gigabit Ethernet Media Options (log scale)
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Example of MLT-3 Encoding
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8B6T Transmission Scheme
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Portion of 8B6T Code Table
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Digital Signal 8B/10B Encoding for Gigabit Ethernet
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Scrambling
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Example of Scrambling with P(X) = 1 + X-3 + X-5
