AppleTalk

• local talk
• CSMA/CA access method
• 3 things happen when devices attached
1. device assigns itself an address randomly
2. device broadcasts the address to see if it's used
3. if not, the device will use it the next time it's online again
• bus or tree
• STP
• max. 32 devices
• Apple share
• file server on an AppleTalk network
• divided into zones
• EtherTalk
• 802.3
• allows protocols to run on ethernet coaxial cable
• TokenTalk
• 802.5
• allows Macintosh to connect to token ring network

ARCnet

• IEEE 802.4 specification - almost
• Cable
• Uses RG-62 (93 ohm) (most common)or
• RG-59 (75ohm) coaxial cable.
• Can also use UTP.
• Uses token passing on a star-bus topology.
• Token moves from computer to computer in numerical order.
• Transmits at 2.5 Mbps.
• ArcNet plus - 20 Mbps
• connected by cable to hub
• 93 ohm RG-62 A/U - 610m max., star
• 93 ohm RG-62 A/U - 305m max., bus <= notice less distance on hub
• RJ-11, RJ-45 UTP - max. 244m on star or bus
• Hubs can be
• Passive => merely relay signal
• Active => regenerate and relay signal
• Smart => add diagnostic features, such as reconfiguration detection

Here are some limitations of ARCNet:

• Bus segment length for coaxial cable is a maximum of 1000 feet, with a limit of 8 workstations per coaxial segment.
• Bus segment length for twisted pair is a maximum of 400 feet, with a limit of 10 workstations per twisted-pair segment.
• There is a maximum of 255 workstations per network.
• Workstations can be located up to 600 feet from the active hub.
• The maximum distance from passive hubs to active hubs is 100 feet; the maximum distance between two active hubs is 2000 feet.
• The maximum distance allowed between workstations is 20,000 feet.
• There can be no more than four workstations on a passive hub, no more than 100 feet from a hub.
• Passive hubs cannot be connected to other passive hubs.