1 10/15/ :22 Chapter 7Ethernet LANs1 Rivier College CS575: Advanced LANs Chapter 7: Ethernet LANs

2 10/15/ :22 Chapter 7Ethernet LANs2 Carrier Sense Multiple Access with Collision Detection (CSMA/CD) as the Ethernet Medium Access Control

3 10/15/ :22 Chapter 7Ethernet LANs3 CSMA/CD Operations

4 10/15/ :22 Chapter 7Ethernet LANs4 Operation of a Two-Level Star-Topology CSMA/CD Configuration

5 10/15/ :22 Chapter 7Ethernet LANs5 IEEE Frame Format

6 10/15/ :22 Chapter 7Ethernet LANs6 IEEE Parameterized Values

7 10/15/ :22 Chapter 7Ethernet LANs7 10-Mbps Ethernet

8 10/15/ :22 Chapter 7Ethernet LANs8 Simple 10BASE-T Configuration

9 10/15/ :22 Chapter 7Ethernet LANs9 Mixed 10BASE-T and 10BASE5 Configuration

10 10/15/ :22 Chapter 7Ethernet LANs10 10BASE-F Medium Specification 0 Added to IEEE in Advantages of the distance and transmission on optical fiber 0 10BASE-FP (passive): passive-star topology for stations/repeaters with up to 1 km per segment; makes synchronous retransmission 0 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.

11 10/15/ :22 Chapter 7Ethernet LANs11 IEEE BASE-T Options

12 10/15/ :22 Chapter 7Ethernet LANs12 IEEE BASE-T Physical Layer Medium Alternatives

13 10/15/ :22 Chapter 7Ethernet LANs13 Collision Domains

14 10/15/ :22 Chapter 7Ethernet LANs14 100BASE-T Repeater Types

15 10/15/ :22 Chapter 7Ethernet LANs15 Maximum Collision Domain (meters)

16 10/15/ :22 Chapter 7Ethernet LANs16 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.

17 10/15/ :22 Chapter 7Ethernet LANs17 Example: 100-Mbps Ethernet Backbone Strategy

18 10/15/ :22 Chapter 7Ethernet LANs18 Digital Signal Encoding for 100BASE-T: 4B/5B-NRZI

19 10/15/ :22 Chapter 7Ethernet LANs19 Digital Signal Encoding for 100BASE-T: 4B/5B-NRZI

20 10/15/ :22 Chapter 7Ethernet LANs20 Example: Gigabit Ethernet Configuration * Error-detection technique requires an Error-Detecting Code (e.g., CRC)

21 10/15/ :22 Chapter 7Ethernet LANs21 Gigabit Ethernet Layers * Error-detection technique requires an Error-Detecting Code (e.g., CRC)

22 10/15/ :22 Chapter 7Ethernet LANs22 Gigabit Ethernet Media Options (log scale)

23 10/15/ :22 Chapter 7Ethernet LANs23 Example of MLT-3 Encoding

24 10/15/ :22 Chapter 7Ethernet LANs24 8B6T Transmission Scheme

25 10/15/ :22 Chapter 7Ethernet LANs25 Portion of 8B6T Code Table

26 10/15/ :22 Chapter 7Ethernet LANs26 Digital Signal 8B/10B Encoding for Gigabit Ethernet

27 10/15/ :22 Chapter 7Ethernet LANs27 Scrambling

28 10/15/ :22 Chapter 7Ethernet LANs28 Example of Scrambling with P(X) = 1 + X -3 + X -5