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
