以太网 100Base-T4 接口
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网卡上以及 Hub 上接口的外观为 8 芯母插座 (RJ45):

网线上插头的外观为 8 芯公插头(RJ45):

| 引脚定义 |
| 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- |