network communications chapter 10
DESCRIPTION
Network Communications Chapter 10. Fast Ethernet (100Mb/s) Networking Technology. MII. Fast Ethernet Protocol Stack. Figure 10.1. Pair 3 data. PMD. Pair 4 data. One wire from pair 2. CSMA/CD. CSMA/CD. One wire from pair 1. 100BaseT4. 100 – Speed Base – baseband T – twisted pair - PowerPoint PPT PresentationTRANSCRIPT
Network CommunicationsChapter 10
Fast Ethernet (100Mb/s) Networking Technology
Fast Ethernet Protocol Stack
Figure 10.1
MII
100BaseT4
• 100 – Speed
• Base – baseband
• T – twisted pair
• 4 – pairs
Figure 10.2
Pair 3 data
Pair 4 data
One wire from pair 2
One wire from pair 1
PMD
CSMA/CDCSMA/CD
100BaseTX
• X - 2 pair (or 1- rare)
• UDP CAT5
• MLT-3
• 4B/5BFigure 10.3: example MLT-3 Signal
(0 0 0 0 1 1 1 0)
(1 1 1 1 0 1 1 1 0 0)
-V
0
+V1 1 1 1 0 1 1 1 0 0
100BaseFX
• F - Fiber
• Separate send & receive fibers
Figure 10.4: Repeater (Hub) Connection
Tx Rx
100Base-FxNIC
Class II OpticalRepeaterTx Rx Tx Rx Tx Rx
Repeater (or Hub)
• Class 1– Larger internal delay– One per Fast Ethernet Segment– Interfaces 100BaseFX 100BaseTX
• Class 2– Two allowed per segment– All nodes of the same type
Network Diameter
• Maximum distance (UDP) between repeaters – 5 meters
• No cable exceeds 100 meters (check Hub specifications)
• Maximum distance between switches – 2000 meters (using fiber)
Expanding Network Diameter:Using An Ethernet Switch
Figure 10.9
Class I Repeater
100BaseTX 100BaseFX
LAN Sw itch100m UTP
Class II Repeater
100BaseTX 100BaseTX
Class II Repeater
100BaseTX 100BaseTX
5metersUTP
Fiber or100 meters UTP