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 4-94-9 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