There may be various reasons why Category 6 network cables and Category 6 crystal heads cannot be used. Here are some of the main factors:

　　Quality issues:

　　Network cable quality: Although Category 6 wires usually have more reliable quality than Category 5 wires, quality problems may still occur. If the Category 6 wires used have defects or defects, such as poor core material, uneven insulation thickness, etc., the transmission speed may not reach gigabits, and even affect the stability of the network connection.

　　Crystal head quality: The quality of the crystal head is as important as the manufacturing process. If the metal sheet of the crystal head is in poor contact, has manufacturing defects or poor materials, it can cause signal attenuation or instability, thus limiting the transmission speed.

　　Wiring sequence issues:

　　The wiring sequence of the network cables must be arranged according to the standard T568A or T568B wiring sequence. If the wiring sequence is incorrect, the network speed may be reduced or the connection cannot be made. You can use the network cable tester to check whether the connection sequence of the network cables is correct.

　　Production process problems:

　　When making a crystal head, improper operation, such as cutting the wire too short, pressing the wire incorrectly, or not following the standard process, may lead to unstable connection between the crystal head and the network cable, which in turn affects the network performance.

　　Network device compatibility issues:

　　If the network interface card of the computer or other network equipment does not support gigabit transmission rate, then gigabit transmission cannot be achieved even if the Category 6 cable and Category 6 crystal head are used. In addition, the settings of network equipment such as routers may also affect the transmission speed, and it is necessary to ensure that it works in gigabit mode.

　　Environmental Interference:

　　In environments with strong sources of electromagnetic interference, such as near power lines and radio towers, the stability of data transmission may be affected. In this case, shielded cables can be considered to reduce the impact of interference.

　　Improper use or damage:

　　The crystal head may be physically damaged during use, such as falling, hitting or squeezing, resulting in bending, breaking or poor contact of the internal metal sheet. In addition, prolonged exposure to humid environments may also cause partial oxidation or corrosion of the crystal head metal.

　　In summary, in order to ensure the normal use of the six types of network cables and six types of crystal heads, it is recommended to choose high-quality products, wire according to the standard line sequence, pay attention to the standardization of the production process, ensure the compatibility of network equipment and reduce the impact of environmental interference. At the same time, during use, pay attention to protecting the crystal head from physical damage, and regularly check its status to detect problems and deal with them in time.