Just if anyone is wondering / needs to know / is bored / (fill-in your own term);
Here's some info per Application-Specific Pair Assignments, as would be found on 4 Pair Cables, along with Mod. Jacks + Plugs (8-Pin / Position):
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[*] Analog Voice: Pins 4-5 = TX / RX, 1-2. 3-6 & 7-8 not used;
[*] ISDN: Pins 1-2 & 7-8 = Power, 3-6 = TX, 4-5 = RX;
[*] 10 BASE-T: Pins 1-2 = TX, 3-6 = RX. 4-5 & 7-8 not used;
[*] Token Ring: Pins 3-6 = TX, 4-5 = RX. 1-2 & 7-8 not used;
[*] ATM User Device: Pins 1-2 = TX, 7-8 = RX. 3-6 & 4-5 = Opt.¹;
[*] ATM Network Eq.: Pins 1-2 = RX, 7-8 = TX. 3-6 & 4-5 = Opt.¹;
[*] 100 BASE-VG: Pins 1-2, 3-6, 4-5 & 7-8 = Bi.²;
[*] 100 BASE-T4: Pins 1-2 = TX, 3-6 = RX. 4-5 & 7-8 = Bi.²;
[*] 100 BASE-TX: Pins 1-2 = TX, 3-6 = RX. 4-5 & 7-8 not used;
[*] 1000 BASE-T: Pins 1-2, 3-6, 4-5 & 7-8 = Bi.².
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Key:
"TX" = Transmit, "RX" = Receive."Opt.¹" = Optional Terminations on some equipment, "Bi.²" = Bidirectional.Scott35
