Page number	Title
1	Introduction
2	Speeds of LANs and computers
3	Network interface hardware
4	I/O interfaces
5	Network connector
6	NICs and network hardware
7	NIC and CPU processing
8	Connection between NIC and physical network
9	Thick Ethernet wiring
10	Thick Ethernet example
11	Connection multiplexing
12	Thin Ethernet wiring
13	Thin Ethernet wiring (continued)
14	Thin Ethernet wiring (continued)
15	10Base-T
16	Hubs
17	Protocol software and Ethernet wiring
18	Comparison of wiring schemes
19	Comparison of wiring schemes (continued)
20	Topologies and network technologies
21	Other technologies
22	Technology translation
23	Summary

• Thick Ethernet also requires termination to avoid signal reflectance

• In some circumstances, transceivers may be inconvenient; e.g., workstations in a lab
• Connection multiplexor connects multiple computers to a single transceiver
  • Each computer's AUI cable connects to connection multiplexor
  • One AUI from multiplexor to Ethernet coax

• Connection multiplexor completely invisible to attached computers

• Uses thin coax that is cheaper and easier to install than thick Ethernet coax
• Transceiver electronics built into NIC; NIC connects directly to network medium
• Coax cable uses BNC connector

• Coax runs directly to back of each connected computer
• T connector attaches directly to NIC

• Useful when many computers are located close to each other
• May be unreliable - any disconnection disrupts entire net

• Variously called 10Base-T, twisted pair or TP Ethernet
• Replaces AUI cable with twisted pair cable
• Replaces thick coax with hub

• Extension of connection multiplexing concept
• Sometimes called ``Ethernet-in-a-box''
• Effectively a very short Ethernet with very long AUI cables
• Can be connected into larger Ethernets

• All wiring technologies use identical Ethernet specification
  • Same frame format
  • Same CSMA/CD algorithms
• Can mix different technologies in one Ethernet
• NICs can provide all three connection technologies

• Protocol software can't differentiate among wiring technologies

• AppleTalk uses bus wiring with coax cable between transceivers

• AppleTalk can also use hub technology or spare wires in 4-wire phone cable

• Adapters can translate between some network technologies
  • Ethernet AUI-to-thinnet

• Ethernet AUI-to-10Base-T adapters

• AppleTalk to phone wire