INSC 40803

1
INSC 40803

• LANs

2
Data Transmission Rates

• 1 bit (b) 1 binary digit, either a 0 or a 1
• 1 byte (B) 8 bits
• bps bits per second (transmitted)
• Kbps thousands of bits per second
• 1 Kbps 1000 bps
• Mbps millions of bits per second
• 1 Mbps 1000 Kbps
• Gbps billions of bits per second
• 1 Gbps 1000 Mbps

3
Components

• Cables
• NICs
• Hubs (or switches)

4
Cable Types

• Twisted Pair
• Unshielded (UTP) -- CAT5, CAT3
• Shielded (STP)
• Coaxial Cable
• Thin
• Thick
• Fiber
• Multi-mode (MMF)
• Single mode (SMF)

5
Topologies

• Logical vs. physical
• Bus
• Star
• Ring
• Mesh

6
Ethernet

• CSMA/CD
• Shared Ethernet
• Switched Ethernet

7
Ethernet LAN Types

• Ethernet
• 10BASE-T
• 10BASE-2
• 10BASE-5
• Fast Ethernet
• 100BASE-T
• 100BASE-F, 100BASE-X, 100BASE-FX
• Gigabit Ethernet (GbE)
• 1000BASE-T
• 1000BASE-F, 1000BASE-LX, 1000BASE-SX, etc.
• 10 GbE

8
LAN Design Issues

• Cost
• Speed
• Availability
• Expandability
• Errors
• Security
• Distance
• Environment
• Application
• Maintenance

9
End of Lecture