# Ethernet 100Base-T4

100Base-T4 uses all four pairs. 100Base-TX only uses two pairs.

(at the network interface cards/hubs)
(at the cables)

RJ45 FEMALE CONNECTOR at the network interface cards/hubs.
RJ45 MALE CONNECTOR at the cables.

Pin | Name | Description
--- | --- | ---
1 | TX_D1+ | Tranceive Data+
2 | TX_D1- | Tranceive Data-
3 | RX_D2+ | Receive Data+
4 | BI_D3+ | Bi-directional Data+
5 | BI_D3- | Bi-directional Data-
6 | RX_D2- | Receive Data-
7 | BI_D4+ | Bi-directional Data+
8 | BI_D4- | Bi-directional Data-

Note: TX & RX are swapped on Hub's. Don't know about Bi-directional data.

Contributor: Joakim Ögren, Kim Scholte

Source:
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Document last modified: 2001-06-07