H3C Technologies H3C S7500E Series Switches - Manual (Page 140)

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Table 82 RJ-45 MDI port pinouts
Pin
10BASE-T/100BASE-TX 1000BASE-T
Signal Function Signal Function
1 Tx+ Send data BIDA+ Bi-directional data cable A+
2 Tx- Send data BIDA- Bi-directional data cable A-
3 Rx+ Receive data BIDB+ Bi-directional data cable B+
4 Reserved — BIDC+ Bi-directional data cable C+
5 Reserved — BIDC- Bi-directional data cable C
6 Rx- Receive data BIDB- Bi-directional data cable B-
7 Reserved — BIDD+ Bi-directional data cable D+
8 Reserved — BIDD- Bi-directional data cable D-
Table 83 RJ-45 MDI-X port pinouts
Pin
10BASE-T/100BASE-TX 1000BASE-T
Signal Function Signal Function
1 Rx+ Receive data BIDB+ Bi-directional data cable B+
2 Rx- Receive data BIDB- Bi-directional data cable B-
3 Tx+ Send data BIDA+ Bi-directional data cable A+
4 Reserved — BIDD+ Bi-directional data cable D+
5 Reserved — BIDD- Bi-directional data cable D-
6 Tx- Send data BIDA- Bi-directional data cable A-
7 Reserved — BIDC+ Bi-directional data cable C+
8 Reserved — BIDC- Bi-directional data cable C-
To ensure normal communication, the pins for sending data on one port should correspond to the pins for
receiving data on the peer port. When both of the ports on the two devices are MDI or MDIX, a crossover
Ethernet cable is needed. A cross-over cable connects devices of the same type. When one port is MDI
and the other is MDIX, a straight-through Ethernet cable is needed. A straight-through cable connects
devices of different types.
If an RJ-45 Ethernet port with MDI/MDIX autosensing enabled can automatically negotiate pin roles. The
S7500E RJ-45 Ethernet ports support MDI/MDIX. By default, MDI/MDIX is enabled on a port.
Making an Ethernet twisted pair cable
1. Cut the cable to length with the crimping pliers.
2. Strip off an appropriate length of the cable sheath. The length is typically that of the RJ-45
connector.
3. Untwist the pairs so that they can lie flat, and arrange the colored wires based on the wiring
specifications.