1 10/15/2015 07:22 Chapter 7Ethernet LANs1 Rivier College CS575: Advanced LANs Chapter 7: Ethernet LANs.

Chapter 7 Ethernet LANs 1

104/19/23 22:46

Rivier CollegeCS575: Advanced LANs

Chapter 7: Ethernet LANs

Chapter 7 Ethernet LANs 2

204/19/23 22:46

Carrier Sense Multiple Access with Collision Detection(CSMA/CD) as the Ethernet Medium Access Control

Chapter 7 Ethernet LANs 3

304/19/23 22:46

CSMA/CD Operations

Chapter 7 Ethernet LANs 4

404/19/23 22:46

Operation of a Two-Level Star-TopologyCSMA/CD Configuration

Chapter 7 Ethernet LANs 5

504/19/23 22:46

IEEE 802.3 Frame Format

Chapter 7 Ethernet LANs 6

604/19/23 22:46

IEEE 802.3 Parameterized Values

Chapter 7 Ethernet LANs 7

704/19/23 22:46

10-Mbps Ethernet

Chapter 7 Ethernet LANs 8

804/19/23 22:46

Simple 10BASE-T Configuration

Chapter 7 Ethernet LANs 9

904/19/23 22:46

Mixed 10BASE-T and 10BASE5 Configuration

Chapter 7 Ethernet LANs 10

1004/19/23 22:46

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.

Chapter 7 Ethernet LANs 11

1104/19/23 22:46

IEEE 802.3 100BASE-T Options

Chapter 7 Ethernet LANs 12

1204/19/23 22:46

IEEE 802.3 100BASE-T Physical Layer Medium Alternatives

Chapter 7 Ethernet LANs 13

1304/19/23 22:46

Collision Domains

Chapter 7 Ethernet LANs 14

1404/19/23 22:46

100BASE-T Repeater Types

Chapter 7 Ethernet LANs 15

1504/19/23 22:46

Maximum Collision Domain (meters)

Chapter 7 Ethernet LANs 16

1604/19/23 22:46

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.

Chapter 7 Ethernet LANs 17

1704/19/23 22:46

Example: 100-Mbps Ethernet Backbone Strategy

Chapter 7 Ethernet LANs 18

1804/19/23 22:46

Digital Signal Encoding for 100BASE-T: 4B/5B-NRZI

Chapter 7 Ethernet LANs 19

1904/19/23 22:46

Digital Signal Encoding for 100BASE-T: 4B/5B-NRZI

Chapter 7 Ethernet LANs 20

2004/19/23 22:46

Example: Gigabit Ethernet Configuration

* Error-detection technique requires an Error-Detecting Code (e.g., CRC)

Chapter 7 Ethernet LANs 21

2104/19/23 22:46

Gigabit Ethernet Layers

* Error-detection technique requires an Error-Detecting Code (e.g., CRC)

Chapter 7 Ethernet LANs 22

2204/19/23 22:46

Gigabit Ethernet Media Options (log scale)

Chapter 7 Ethernet LANs 23

2304/19/23 22:46

Example of MLT-3 Encoding

Chapter 7 Ethernet LANs 24

2404/19/23 22:46

8B6T Transmission Scheme

Chapter 7 Ethernet LANs 25

2504/19/23 22:46

Portion of 8B6T Code Table

Chapter 7 Ethernet LANs 26

2604/19/23 22:46

Digital Signal 8B/10B Encoding for Gigabit Ethernet

Chapter 7 Ethernet LANs 27

2704/19/23 22:46

Scrambling

Chapter 7 Ethernet LANs 28

2804/19/23 22:46

Example of Scrambling with P(X) = 1 + X-3 + X-5