Test Your Understanding ·P188 ·2 4-6
4-6 • Test Your Understanding • P 188 • 2
Ethernet Physical Layer Standards
Ethernet Physical Layer Standards
Figure 4-3: Baseband versus broadband Transmission Baseband transmission Signal Transmitted Signal (same) Source Transmission Medium Signal is injected directly into the transmission medium (wire, optical fiber) Inexpensive, so dominates wired Lan transmission technology BASE in standard names means baseband 4-8
4-8 Figure 4-3: Baseband Versus Broadband Transmission Baseband Transmission Source Signal Transmitted Signal (Same) Transmission Medium Signal is injected directly into the transmission medium (wire, optical fiber) Inexpensive, so dominates wired LAN transmission technology BASE in standard names means baseband
Figure 4-3: Baseband versus broadband Transmission, Continued Broadband transmission L Modulated Signa Radio channel Source Radio Tuner The radio tuner modulates the signal to a higher frequency The transceiver then sends the signal in a radio channel Expensive but needed for radio-based networks Not used in Ethernet, but is used in wireless LANs(discussed in Chapter 5) 4-9
4-9 Figure 4-3: Baseband Versus Broadband Transmission, Continued Broadband Transmission Source Radio Tuner Modulated Signal Radio Channel The radio tuner modulates the signal to a higher frequency. The transceiver then sends the signal in a radio channel. Expensive but needed for radio-based networks. Not used in Ethernet, but is used in wireless LANs (discussed in Chapter 5)
I Figure 4-2: Ethernet Physical Layer Standards UTP Physical Speed Maxim um Medium Layer Run Required Standards Leng 10BASE-T 10 Mbps 100 meters 4-pair Category 3 or higher 100BASE-TX 100 Mbps 100 meters 4-pair Category 5 or higher 1000BASE-T 1,000 Mbps 100 meters 4-pair Category 5 or higher (Gigabit Ethernet) 100BASE-TX dominates access links today, Although 1000BASE-T is growing in access links today 4-10
4-10 Figure 4-2: Ethernet Physical Layer Standards UTP Physical Layer Standards Medium Required Maximum Run Length Speed 100BASE-TX 100 Mbps 100 meters 4-pair Category 5 or higher 1000BASE-T (Gigabit Ethernet) 1,000 Mbps 100 meters 4-pair Category 5 or higher 10BASE-T 10 Mbps 100 meters 4-pair Category 3 or higher 100BASE-TX dominates access links today, Although 1000BASE-T is growing in access links today