CHAPTER AppleTalk an ArcNet Networks

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

An Overview of Apple Networks MODULE An Overview of Apple Networks © N. Ganesan, All rights reserved.

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

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Apple Network Implementations MODULE Apple Network Implementations © N. Ganesan, All rights reserved.

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 Connector Module 8-pin Plug 8-pin plug. Plugs into built-in socket. Printer

AppleShare File server on the AppleTalk network A print server is also available for functioning with the file server

AppleShare Implementation Zone 3 Zone 1 Zone 2 Server Server Server

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 Implementation Requirements TokenTalk NB card TokenTalk (AppleTalk Phase 2 compatible) software Cables, Connectors etc. As applicable to Token Ring networks

END OF MODULE

© N. Ganesan, All rights reserved. MODULE ArcNet © N. Ganesan, All rights reserved.

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 Server Client Hub Client Client

Token Rotation Server 2 Client 1 3 Hub Client 4 Client 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 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 CHAPTER