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Application-Specific Pair Assignments for the 100 Ohm Cabling

Application	Pins 1-2	Pins 3-6	Pins 4-5	Pins 7-8
ISDN	Power	TX	RX	Power
Analog Voice	-	-	TX/RX	-
802-3 (10BASE-T)	TX	RX	-	-
802-5 (Token Ring)	-	TX	RX	-
FDDI (TP-PMD)	TX	Optional¹	Optional¹	RX
ATM User Device	TX	Optional¹	Optional¹	RX
ATM Network Equip	RX	Optional¹	Optional¹	TX
1000BASE-T (802.3ab)	Bi	Bi	Bi	Bi
100BASE-VG (802.12)	Bi	Bi	Bi	Bi
100BASE-T4 (802.3u)	TX	RX	Bi	Bi
100BASE-TX (802.3u)	TX	RX	-	-

*Bi = bi-directional
TX = Transmit
RX = Receive
¹Optional terminations may be required by some manufacturers’ active implementations.