CHAPTER CHAPTER

AppleTalk an ArcNet AppleTalk an ArcNet NetworksNetworks

Chapter Objectives

• Discuss two other types of LANs that are not in the mainstream of networking

• Provide a basic understanding of networking Apple computers

• Familiarize oneself with Apple networking terms

• Describe the functional features of ArcNet

Chapter Modules

• An Overview of Apple Networks• Apple Network Implementations• ArcNet

© N. Ganesan, All rights

reserved.

MODULE

An Overview of Apple Networks

Module Objectives

• Define AppleTalk• AppleTalk communication process• Terms used in Apple networking

AppleTalk Defined

• Introduced by Apple for Macintosh connectivity

• Built-in Networking– NIC built-into Macintosh hardware– Apple OS has built-in networking

features

• Supports other computers as well

AppleTalk Communication

• Uses CSMA/CA– Collision Avoidance is the main

difference from CSMA/CD• Basic operation

– A workstation chooses an address from a list

– Checks for availability– If available, assigns and uses the

address for communication

Apple Network Terminology

• AppleTalk• LocalTalk• AppleShare• EtherTalk• TokenTalk

AppleTalk

• Refers to the Apple network architecture

• Overall reference to Apple networking

• Variations in the implementation exist

END OF MODULEEND OF MODULE

© N. Ganesan, All rights

reserved.

MODULE

Apple Network Implementations

Module Objectives

• Define LocalTalk• Present a network configured based

on LocalTalk• Define AppleShare and show an

example of AppleShare implementation

• Explain EtherTalk and TokenTalk and discuss their respective implementation requirements

LocalTalk

• Refers to the process of Apple Networking in terms of its components

• LocalTalk components– Cables and cable extenders– Connector modules– NIC hardware is built-into Macintosh

hardware

A Sample LocalTalk Implementation

Computer Computer

Printer

ConnectorModule

8-pin Plug8-pin plug.Plugs intobuilt-in socket.

AppleShare

• File server on the AppleTalk network

• A print server is also available for functioning with the file server

AppleShare Implementation

Server Server Server

Zone 1 Zone 2 Zone 3

EtherTalk

• Designed to facilitate AppleShare connectivity over Ethernet– IEEE 802.3 compliance enforced

• Enables AppleShare protcols to be carried over Ethernet cabling

EtherTalk Implementation Requirements

• EtherTalk NB card• EtherTalk (AppleTalk Phase 2

compatible) software• Cables, Connectors etc.

– As applicable to Ethernet networks

TokenTalk

• Designed to facilitate AppleShare connectivity over Token Ring– IEEE 802.5compliance enforced

• Enables AppleShare protcols to be carried over Token Ring cabling

• TokenTalk NB card• TokenTalk (AppleTalk Phase 2

compatible) software• Cables, Connectors etc.

– As applicable to Token Ring networks

TokenTalk Implementation Requirements

END OF MODULEEND OF MODULE

© N. Ganesan, All rights

reserved.

MODULE

ArcNet

Module Objectives

• Define ArcNet and indicate its topology

• Discuss the access method and speed

• Show an ArcNet implementation structure and its functioning

• Discuss the implementation rules

ArcNet Defined

• A simple and inexpensive network developed by Datapoint Corporation in 1977

• Uses a token-passing access method over a star-bus topology

Topology

• Logical– Bus

• Physical– Star

Access Method and Speed

• Baseband access• Token rotation

– Combination of the Ethernet and Token Ring access mechanisms

– Loose compliance with IEEE 802.4

• Speed– 2.5 Mbps, 20 M bps (ArcNet Plus)

ArcNet Implementation

Hub

Client Client

ClientServer

Token Rotation

Hub

ClientClient

ClientServer1

2

3

4

Note: Token rotation can be in the order 1 3 4 2 as well.

Rules Pertaining to Cable Length

• 2000’ coaxial cable, star topology• 1000’ coaxial cable, bus topology• 800’ for twisted pair

Other Implementation Rules

• Maximum number of computers in a segment– Depends on the cable

• Minimum length between computers– Depends on the cable

• Multiple segment network is not supported– Segments cannot be linked with ease

Cables Used

• Coaxial– 93 Ohm

• Twisted-pair• Optical fiber

END OF MODULE END OF MODULE

END OF CHAPTER END OF CHAPTER