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Application-Specific Pair Assignments For 100 Ω 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 Equipment RX Optional¹ Optional¹ TX
10GBASE-T (802.3an) Bi Bi Bi Bi
1000BASE-T (802.3ab) Bi Bi Bi Bi
1000BASE-TX (TIA/EIA 854) TX RX TX RX
100BASE-VG (802.12) Bi Bi Bi Bi
100BASE-T4 (802.3u) TX RX Bi Bi
100BASE-TX (802.3u) TX RX - -
1000BASE-TX2/4 TX RX - -
Key:
Bi = bi-directional
TX = Transmit
RX = Receive

1 Optional terminations may be required by some manufacturers' active implementations.