LAN Wiring Physical Topology and Interface Hardware 1

LAN Wiring, Physical Topology, and Interface Hardware 1

Network Interface Hardware 2

Ethernet Wiring • Three schemes – Correspond to three generations – All use same frame format 3

Original Thick Ethernet Wiring • Used heavy coaxial cable • Formal name 10 Base 5 • Called thicknet 4

Connection Multiplexing • Concept – Multiple stations share one network connection • Motivation – Cost – Convenience of wiring • Hardware device required 5

Illustration Of Connection Multiplexing • Multiplexing device attached to network • Stations attach to device • Predates hubs 6

Second Generation Ethernet Wiring • Used thinner coaxial cable • Formal name 10 Base 2 • Called thinnet 7

Modern Ethernet Wiring • Uses a hub • Formal name 10 Base-T, 1000 Base-T • Called twisted pair Ethernet 8

Twisted Pair Ethernet 9

Different NIC Connector 10

Ethernet Wiring In An Office 11

A Note About Ethernet Topology • Apparently – Original Ethernet used bus topology – Modern Ethernet uses star topology • In fact, modern Ethernet is – Physical star – Logical bus – Called star-shaped bus 12

Categories of Wire 13

Higher Speed Ethernets • Fast Ethernet – Operates at 100 Mbps – Formally 100 Base-T – Two wiring standards – 10/100 Ethernet devices available • Gigabit Ethernet – Operates at 1000 Mbps (1 Gbps) – Slightly more expensive 14