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
