Chapter 12

Local Area Networks

• Project 802

• Ethernet

• Token Ring

• FDDI

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

Figure 12-1

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

OSI Model and Project 802

Logical Link Control (LLC) provides single data link control protocol for all IEEE LANs while Media Access Control (MAC) provides different protocols for different LANs.

MAC contains synchronization, flag, flow and error control specifications necessary to move information from one place to another and the physical address of the next station to reduce and route a packet.

Figure 12-2

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

Project 802

Figure 12-3

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

PROTOCOL DATA UNIT(PDU) Format

Figure 12-4

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PDU Control Field

Figure 12-5

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

ETHERNET

Figure 12-6

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Evolution of CSMA/CD

Figure 12-7

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

MAC Frame

PDU can be from 46 to 1500 bytes

Figure 12-8

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

10BASE5- THICK ETHERNET

LAN Topology, Baseband signal, maximum segment length 500meters

Ethernet Segments

Figure 12-9

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Figure 12-9-continued

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10BASE5-THICK ETHETNRT

Figure 12-10

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

Transceiver connection in 10Base5

Figure 12-11

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Figure 12-11-continued

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10BASE2-THIN ETHERNET

LAN Topology, reduced cost, easy installation.Shorter range, less capacity.

Figure 12-12

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Figure 12-12-continued

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

10BASET

Star topology LAN, maximum length 100meters

Figure 12-13

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Figure 12-13-continued

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1BASE5

Star topology

Figure 12-14

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

Figure 12-15

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

Token Passing

Figure 12-15-continued

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Token Passing

Figure 12-15-continued

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

Token Passing

Figure 12-15-continued

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

Token Passing

Figure 12-16

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

Token Ring Frame

Figure 12-17

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

Data Frame Fields

Figure 12-17-continued

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Data Frame Fields

Figure 12-18

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

Token Ring

Figure 12-19

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

Token Ring Switch

Figure 12-20

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

MAU

Figure 12-21

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FDDI

Figure 12-22

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FDDI Example

Figure 12-22-continued

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FDDI Example

Figure 12-23

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

FDDI Encoding

Figure 12-24

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FDDI Layers

Figure 12-25

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FDDI Frames

Figure 12-26

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

FDDI Rings

Figure 12-27

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FDDI Ring Failure

Figure 12-28

WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998

FDDI Nodes