### 6.1.1 1000BASE-T／100BASE-TX／10BASE-T Port

1000BASE-T/100BASE-TX/10BASE-T ports are Ethernet ports with auto-negotiation of three speeds: 10 Mbps, 100 Mbps, and 1000 Mbps. They support auto MDI/MDIX Crossover, and use RJ 45 connectors.

Compliant with IEEE 802.3ab, 1000BASE-T requires Category 5e 100-ohm UTP or STP (recommended) with a maximum distance of 100 meters (328 feet).

The 1000BASE-T port requires all four pairs of wires to be connected for data transmission. The following figure shows the connection of twisted pairs used by a 1000BASE-T port.

Figure6-1 Connections of Four Twisted Pairs for the 1000BASE-T Port

100BASE-TX/10BASE-T can be interconnected using cables of the preceding specifications. For 10 Mbps, the 100BASE-TX/10BASE-T port can be connected using 100-ohm Category 3, Category 4, and Category 5 cables; for 100 Mbps, the 100BASE-TX/10BASE-T port can be connected using 100-ohm Category 5 cables with a maximum connection distance of 100 meters. The following table shows 100BASE-TX/10BASE-T pin assignments.

Table6-1 Pin Assignments for the 100BASE-TX/10BASE-T Port

Pin | Socket | Plug
1 | Input Receive Data+ | Output Transmit Data+
2 | Input Receive Data– | Output Transmit Data–
3 | Output Transmit Data+ | Input Receive Data+
6 | Output Transmit Data– | Input Receive Data–
4, 5, 7, 8 | Not Used | Not Used

The following figure shows feasible connections of straight-through and crossover twisted-pair cables for 100BASE-TX/10BASE-T.

Figure6-2 Twisted Pair Connections for the 100BASE-TX/10BASE-T Port