Older Ethernet Standards

1
Older Ethernet Standards

• Do Not Use Hubs or Switches
• Daisy-Chain Layouts
• 10Base5
• 10 Mbps, Baseband, 500 meters per segment (daisy
  chain)
• 10Base2
• 10 Mbps, Baseband, 185 meters per segment (daisy
  chain)
• Less expensive than 10Base5
• Often called Cheapernet

2
Ethernet 10Base5
Mod C
Drop Cable (Attachment Unit Interface or AUI) 15
wires
NIC
15-pin AUI Connector
N-Connector
Trunk Cable Coaxial Cable 500 m maximum
Transceiver (Medium Attachment Unit)
3
Ethernet 10Base5
Mod C
1. Sending NIC Transmits a bit
3. Each Transceiver Sends the bit to Its NIC
2. Transceiver Broadcasts the bit
4
Ethernet 10Base-5

• Up to 5 segments connected by repeaters
• 2,500 meters maximum distance between farthest
  stations
• Four repeaters maximum
• No loops among repeaters

Repeater
Repeater
Drop cable
500 m Maximum
Segment of Trunk Cable
5
Ethernet 10Base2 (802.3a)

• Cheaper Physical Layer Standard
• NICs have twist-on BNC connector
• T-connector attaches to NIC
• T-connector has BNC connectors for cable runs
  attaching it to adjacent stations

To next NIC
To next NIC
T-connector
BNC
NIC
6
Ethernet 10Base2 (802.3a)

• Segments are thin coaxial cable
• Run only between NICs
• Daisy chain of NICs is a segment
• Terminator at end of each segment
• Up to 30 stations per segment
• 5 segments (4 repeaters) maximum
• 10Base2 185 meters/segment

Terminator
NIC
NIC
NIC