Figure 4-2: Ethernet Physical Layer Standards Continued Fiber Physical Speed Maxim um Medium Layer Run 850 nm light (inexpensive) Standards Length Multim ode fiber 1000BASE-SX 1 Gbps 220m 62.5 160 microns MHz-km 1000BASE-SX 1 Gbps 275m 62.5 200 1000BASE-SX1 Gbps 500m 50 400 1000BASE-SX 1 Gbps 550m 50 500 The 1000BASE-SX standard dominates trunk links today Carriers use 1310 and 1550 nm light and single-mode fiber 4-11
4-11 Fiber Physical Layer Standards Medium 850 nm light (inexpensive) Multimode fiber Maximum Run Length Speed 1000BASE-SX 1 Gbps 275 m 1000BASE-SX 1 Gbps 500 m 1000BASE-SX 1 Gbps 220 m 1000BASE-SX 1 Gbps 550 m Figure 4-2: Ethernet Physical Layer Standards, Continued 62.5 microns 160 MHz-km 62.5 200 50 400 50 500 The 1000BASE-SX standard dominates trunk links today. Carriers use 1310 and 1550 nm light and single-mode fiber
10 Gbps Ethernet Revised 10 Gbps Ethernet usage is small but growing Several 10 Gbps fiber standards are defined but none is dominant 4-12
4-12 10 Gbps Ethernet • 10 Gbps Ethernet usage is small but growing • Several 10 Gbps fiber standards are defined, but none is dominant Revised
10 Gbps Ethernet Revised 10 Gbps Ethernet usage is small but growing Several 10 Gbps 10GBASE-x fiber standards are defined but none is dominant Copper is cheaper than fiber but cannot go as fa 10GBASE-CX4(shielded Infiniband cable)up to 15m UTP Category 6: 55 meters maximum (UTP) Category 6A: 100 meters(UTP Category 7: 100 meters(shielded twisted pair, STP, which has metal shielding around each pair and around the cord) 4-13
4-13 10 Gbps Ethernet • 10 Gbps Ethernet usage is small but growing • Several 10 Gbps 10GBASE-x fiber standards are defined, but none is dominant • Copper is cheaper than fiber but cannot go as far – 10GBASE-CX4 (shielded Infiniband cable) up to 15 m – UTP • Category 6: 55 meters maximum (UTP) • Category 6A: 100 meters (UTP) • Category 7: 100 meters (shielded twisted pair, STP, which has metal shielding around each pair and around the cord) Revised
100 Gbps Ethernet New Information 100 Gbps has been selected as the next ethernet speed 100 Gbps ethernet standards development is just getting underway 4-14
4-14 100 Gbps Ethernet • 100 Gbps has been selected as the next Ethernet speed • 100 Gbps Ethernet standards development is just getting underway New Information
Test Your Understanding ·P193 3 4-15
4-15 • Test Your Understanding • P 193 • 3