Ethernet Cable

Types of Ethernet Cables

An Ethernet cable connects a maintenance terminal to the console port on the device for local or remote maintenance.

Ethernet cables are classified into straight-through cables and crossover cables.

• Straight-through cable: The twisted pairs in the RJ45 connectors at both ends are crimped in the same sequence. A straight-through cable connects two devices of different types, for example, a PC and a switch.
• Crossover cable: The twisted pairs in the RJ45 connectors at two ends are crimped in different sequences. A crossover cable connects two devices or interfaces of the same type, for example, two PCs.

Crossover and straight cables only differ in wire sequences, and function the same when transmitting data.

Huawei S series models support both straight-through and crossover cables and their ports are adaptive to the cable types.

Use shielded Ethernet cables when devices complying with EN 50121-4 are used in environments that meet EN 50121-4 requirements.

Appearance and Structure

The straight-through cable and the crossover cable have the same appearance and use the RJ45 connector.

Figure 8-20 shows the appearance of an Ethernet cable.

Figure 8-20 Appearance of an Ethernet cable

Figure 8-21 shows the structure of an Ethernet cable.

Figure 8-21 Structure of an Ethernet cable

Pin Assignments

Table 8-10 lists pin assignments of a straight-through cable.

Table 8-11 lists pin assignments of a crossover cable.

To achieve the best electrical transmission performance, ensure that the wires connected to pins 1 and 2 and to pins 3 and 6 are twisted pairs.